JP3171556B2 - Gas hot air heater - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a gas warm air heater.

[0002]

2. Description of the Related Art In a gas hot air heater, a gas burner is housed in a main body case disposed in a room, and room air is sucked into the main body case by a blower fan provided in the main body case. A so-called fan heater type is known, in which blown room air is blown into a room together with the combustion hot air of a gas burner. In this type, a part of the room air sucked into a main body case by a blower fan is supplied to a gas burner. Served as combustion air.

In this type of gas warm air heater, the room temperature is detected using a room temperature sensor, and the combustion of the gas burner is performed so that the detected room temperature substantially matches the set room temperature set by the user or the like. In recent years, in order to control the temperature and the air volume of the blower fan, and in order to perform such temperature control of the room temperature, the combustion and extinguishing of the gas burner are intermittently performed based on a comparison between the detected room temperature and the set temperature ( A gas burner that automatically repeats combustion and extinguishing) has also been developed by the present applicant. In this case, in such a hot air heater,
When the user turns on the operation switch provided in the main body case, the operation of the blower fan and the combustion of the gas burner are started,
Thereafter, as the detected room temperature approaches the set room temperature, the combustion amount of the gas burner and the rotation speed of the blower fan are gradually reduced. Then, when the detected room temperature becomes higher than a predetermined temperature (a temperature determined based on the set room temperature) to some extent, the gas burner is once extinguished. When the detected room temperature becomes somewhat lower than the predetermined temperature in the fire extinguishing state, the combustion operation of the gas burner is started. To resume. Thereafter, by repeating such combustion and extinguishing of the gas burner, the temperature control at room temperature is performed.

[0004] During the combustion of the gas burner, the blower fan is controlled so as to have an airflow corresponding to the fuel amount (the higher the combustion amount, the larger the airflow). In the early stage of the combustion of the gas burner, the gas burner usually has a maximum combustion amount or a large combustion amount close to the maximum combustion amount in order to quickly stabilize the combustion flame of the gas burner and quickly raise the room temperature toward the set room temperature. At the beginning of the combustion start of the gas burner, the blower fan is also controlled to its maximum rotation speed or a high-speed rotation close to it. Also,
During the extinguishing of the gas burner at the time of temperature control as described above, the blower fan is generally stopped, but in order to make the detected room temperature of the room temperature sensor defining the timing of restarting the combustion of the gas burner as accurate as possible, It has been proposed by the present applicant that the blower fan is continuously operated at a very low rotation speed during the extinguishing of the gas burner to continuously convect the indoor air (see Japanese Patent Application No. 7-344210). .

By the way, in such a gas warm air heater, when the heating operation is started in response to the operation switch being turned on by a user or the like, a predetermined period (for example, a predetermined period) is required before the combustion operation of the gas burner is started. In general, pre-purge in the main body case is performed by operating only the blower fan for a predetermined period of time), and the combustion operation of the gas burner is started after the pre-purge. This is for the following reasons. That is, for example, when the gas warm air heater is in an unused state for a long time before its operation, undesired gas components, dust, and the like due to combustion of the gas burner may remain in the main body case. In such a state, when the user turns on the operation switch for performing the heating operation and immediately starts the combustion operation of the gas burner in response to the operation switch, a combustion abnormality may occur.

Therefore, by performing the pre-purge,
Ventilate the inside of the case. In addition, this prepurge is also performed to check whether the blower fan operates normally.
Used as needed.

Accordingly, as described above, the combustion of the gas burner
Even in a gas hot air heater that performs intermittent fire extinguishing to control the temperature of the room temperature, the gas burner burns from the extinguished state when starting the heating operation in response to turning on the operation switch, as well as during the subsequent temperature control control. When restarting the operation, it is generally conceivable to perform prepurge in the same manner as when starting the heating operation in response to turning on the operation switch.

However, it has been found by the inventors of the present application that the above-described device causes the following inconvenience.

That is, the prepurge is normally performed at the maximum rotational speed of the blower fan or at a high rotational speed close to it, so that sufficient ventilation in the main body case is performed in a short time as possible. This is because, in the pre-purge, a mere blow that is not warm air is performed,
If the prepurge is performed for a long period of time, the user may feel a feeling of cool air, and for the user, the combustion of the gas burner starts as soon as possible after the operation switch is turned on, and hot air is blown out. Is preferred.

On the other hand, at the start of combustion of the gas burner (at the time of ignition)
In general, the ignition should be performed satisfactorily without causing a lift of the combustion flame, etc.In order to reduce the odor, the air volume of the blower fan should be smaller than during the steady combustion of the gas burner. Is preferred.

However, as described above, in a gas hot air heater that intermittently controls the temperature of a gas burner by intermittently burning and extinguishing a gas burner, the maximum number of rotations of the blower fan or the maximum number of rotations of the blower fan is always increased before the combustion of the gas burner starts. If the pre-purge is performed at a high speed and at a high speed, the air volume of the blower fan becomes too large at the start of combustion of the gas burner following the pre-purge (at the time of ignition), and the lift of the combustion flame of the gas burner is increased. Etc. or odor is likely to occur.
In this case, there is practically no problem as long as the generation of such a combustion flame at the start of combustion of the gas burner as a lift or the generation of odor occurs only at the start of the heating operation in accordance with the turning on of the operation switch. However, during temperature control, the combustion of the gas burner is repeated at relatively short time intervals.
It is not preferable that a combustion flame is lifted or the like or an odor is generated each time the gas burner starts burning.

Further, if the prepurge described above is always performed before the start of combustion of the gas burner, every time the combustion operation of the gas burner is restarted repeatedly during the temperature control, a mere blow by the blower fan immediately before the restart is performed. Will be performed.

[0013] However, for the user, during the heating operation (during the temperature control), a large amount of air is simply blown by the operation of only the blower fan as described above. It is not preferable that the operation is frequently performed every time the operation is restarted because the user tends to receive a feeling of cold wind.

Further, it is preferable that the restart of the combustion operation of the gas burner at the time of the temperature control be performed promptly in response to the decrease in the room temperature. However, it is preferable that the prepurge described above is always performed before the start of the combustion of the gas burner. When the room temperature is lower than the set room temperature, the combustion of the gas burner and the blowing of the hot air corresponding thereto are delayed by the time of the prepurge.

In view of such inconvenience, the inventors of the present application conducted various studies, and obtained the following findings.

That is, at the time of starting the heating operation in response to the turning on of the operation switch, as described above, there may be cases where undesired gas components, dust, and the like due to the combustion of the gas burner stay in the main body case. Therefore, it is necessary to perform the prepurge before the start of the combustion of the gas burner, and to perform the prepurge with a large air volume of the blower fan in order to perform the prepurge sufficiently and in a short time. However, when restarting the combustion of the gas burner during the temperature control, the warm air heater is already operating normally, and the period during which the combustion of the gas burner stops during the temperature control is short. After the combustion of the gas burner is stopped, the blower fan is continuously operated for a certain period of time to perform post-purge in order to discharge the residual heat in the main body case. For this reason, during the extinguishing of the gas burner during temperature control,
Generally, undesirable gas components, dust, and the like do not stay. Therefore, when the temperature control is being performed after the start of the heating operation, it is not necessary to perform the prepurge in the main body case with a large air volume as at the start of the heating operation before starting the combustion of the gas burner, or It is considered that there is no problem even if the combustion operation of the gas burner is restarted without performing the prepurge. In particular, in the case where the blower fan is operated at a low speed and the room air is convected during the extinguishing of the gas burner during temperature control, the prepurge in the main body case is performed by the operation of the blowing fan during the extinguishing of the gas burner. Therefore, when restarting the combustion of the gas burner according to the drop in room temperature,
There is no hindrance to restarting gas burner combustion immediately without performing pre-purge as in the start of heating operation
R>.

[0017]

SUMMARY OF THE INVENTION In view of the above background, the present invention relates to a gas hot air heater that intermittently burns and extinguishes a gas burner during temperature control for making room temperature substantially equal to a set temperature. When restarting the combustion of the gas burner at the time of control, start the combustion of the gas burner while preventing the lift of the combustion flame and the generation of odor, without performing prepurge with a large air flow by the blower fan as at the start of the heating operation. It is possible to reduce or avoid a situation in which a user feels a cold wind repeatedly at the start of the combustion operation of the gas burner at the time of the temperature control, and to use the gas burner according to the room temperature at the time of the temperature control. An object of the present invention is to provide a gas warm air heater capable of quickly restarting combustion.

[0018]

In order to achieve the above object, a first aspect of the gas hot air heater according to the present invention is to provide a gas burner housed in a main body case and indoor air in the main body case. A blower fan that sucks the air and blows the sucked air together with the combustion hot air of the gas burner, a room temperature detecting unit that detects a room temperature, an operation switch that instructs an operation / stop of a heating operation, and a heating operation that is instructed by the operation switch Combustion control means for intermittently performing combustion and extinguishing of the gas burner in accordance with the detected room temperature so as to perform temperature control to substantially match a room temperature detected by the room temperature detection means with a set temperature; and A fan control means for controlling the blower fan so as to have an air flow corresponding to the combustion amount of the gas burner during combustion. The means includes means for operating the blower fan so as to perform a prepurge in the main body case for a predetermined period before the combustion of the gas burner is started only when the operation switch is instructed to start the heating operation by the operation switch; The control means starts the combustion operation of the gas burner after the prepurge when the operation start of the heating operation is instructed by the operation switch, and restarts the combustion operation during the extinguishing of the gas burner during the temperature control control. It is characterized in that a means is provided for immediately starting the combustion operation of the gas burner in response to the timing to be performed.

According to the first aspect of the present invention, when the operation of the heating operation is instructed by the operation switch, and the heating operation is started, first, as in the related art, the fan control means first performs the heating operation. The blower fan is operated, the prepurge in the main body case is performed for a predetermined period, and thereafter, the combustion operation of the gas burner is started by the combustion control means, and the blower fan is burned by the blower fan control means by the blower fan control means. The air volume is controlled to correspond to the air volume. At this time, the air sucked into the main body case by the blower fan is blown out together with the combustion air of the gas burner (warm air is blown out into the room), and heating of the room is started. After the heating operation is started as described above, the combustion control unit performs combustion / extinguishing of the gas burner according to the detected room temperature in order to perform temperature control that substantially matches a room temperature detected by the room temperature detection unit with a set temperature. It is done intermittently. Then, when the room temperature decreases during the extinguishing of the gas burner during the temperature control and the timing to restart the combustion operation of the gas burner is reached, the prepurge by the blowing fan is not performed, and the combustion control means The combustion of the gas burner starts immediately. In this case, the fan control means controls the blower fan so as to have an airflow corresponding to the combustion amount at the start of combustion of the gas burner, and the airflow of the blower fan is generally controlled immediately by the control. It does not increase to the air volume corresponding to the volume, causing a delay. For this reason, when restarting the combustion operation of the gas burner during temperature control, the air volume of the blower fan at the start of the combustion becomes smaller than the combustion volume of the gas burner, and lift of combustion flame and generation of odor , The combustion operation of the gas burner is started satisfactorily.

Therefore, according to the first aspect of the present invention, when restarting the combustion operation of the gas burner at the time of the temperature control, the combustion operation of the gas burner is started without performing the prepurge by the blower fan. Combustion can be initiated while preventing lift of the combustion flame and generation of odor. In addition, since prepurge is not performed when restarting the combustion operation of the gas burner at the time of temperature control, it is possible to avoid a situation in which the user repeatedly feels a cold wind every time the combustion operation of the gas burner is started at the time of temperature control. Can be. Further, when the room temperature drops during the extinguishing of the gas burner during the temperature control, and it is time to restart the combustion operation of the gas burner,
Since the combustion operation of the gas burner is started immediately without performing the pre-purge, the combustion operation of the gas burner can be restarted in response to a decrease in room temperature, and the blowing of warm air can be quickly performed.

Next, according to a second aspect of the gas hot air heater of the present invention, in order to achieve the above object, a gas burner housed in a main body case and a room air are sucked into the main body case. A blower fan that blows out the sucked air together with the combustion hot air of the gas burner, a room temperature detecting unit that detects a room temperature, an operation switch that instructs operation / stop of a heating operation, and a heating operation commanded by the operation switch. Combustion control means for intermittently performing combustion and extinguishing of the gas burner in accordance with the detected room temperature so as to perform temperature control for causing a room temperature detected by the room temperature detection means to substantially match a set temperature; and A fan control means for controlling the blower fan so as to have an air flow corresponding to the combustion amount of the gas burner, wherein the fan control means comprises: When a start of heating operation is instructed by an operation switch, the blower fan is operated so as to perform a prepurge in the main body case for a predetermined period before the combustion of the gas burner is started, and the gas burner is extinguished during the temperature control. Means for controlling the blower fan to operate the blower fan once at a lower rotational speed than at the time of the prepurge, when the timing to restart the combustion operation is reached during the combustion control. The means starts the combustion operation of the gas burner after the prepurge when the operation start of the heating operation is instructed by the operation switch, and when restarting the combustion of the gas burner during the temperature control, Means for immediately starting the combustion operation of the gas burner after the end of the operation control of the blower fan at a low rotation speed. It is characterized in.

According to the second aspect of the present invention, when the start of the heating operation is instructed by the operation switch, after the prepurge by the blower fan, the combustion of the gas burner is performed in the same manner as in the first aspect. The operation is started, and temperature control is performed to intermittently perform combustion and extinguishing of the gas burner. Then, when the room temperature drops during the extinguishing of the gas burner during the temperature control and the timing for restarting the combustion operation of the gas burner comes, the fan control means accordingly temporarily turns off the blower fan during the prepurge. It is controlled to operate at a lower rotational speed, and immediately after the operation is completed, the combustion operation of the gas burner is started by the combustion control means. In this case, by controlling the blower fan to operate at the low rotation speed before the start of the combustion operation of the gas burner, only the blowing is performed during that time, but the blowing starts the heating operation by the operation switch. Since a small air flow is performed at a lower rotation speed than the rotation speed of the blower fan in the pre-purge when instructed, a situation in which a cool air feeling is given to the user when restarting the combustion operation of the gas burner that is repeatedly performed during the temperature control control. It is reduced. After the operation of the blower fan is controlled at the low rotation speed by the fan control means, the blower fan is controlled so as to have an air flow corresponding to the combustion amount at the start of the combustion operation of the gas burner. Since the operation of the blower fan before the start of the combustion operation is performed at a lower rotation speed than the rotation speed of the blower fan in the prepurge when the operation start of the heating operation is instructed by the operation switch, the operation is the same as in the first embodiment. However, the air volume of the blower fan does not immediately increase to the air volume corresponding to the combustion amount of the gas burner, causing a delay. For this reason, when restarting the combustion operation of the gas burner during temperature control, the air volume of the blower fan at the start of the combustion becomes smaller than the combustion volume of the gas burner, and lift of combustion flame and generation of odor , The combustion operation of the gas burner is started satisfactorily.

Therefore, according to the second aspect of the present invention, when restarting the combustion operation of the gas burner at the time of temperature control, the temperature is lower than at the time of the prepurge when the operation start of the heating operation is instructed by the operation switch. By starting the combustion operation of the gas burner after controlling the blower fan to operate at the rotation speed, the combustion of the gas burner is started while preventing the lift of the combustion flame and the generation of odor as in the first embodiment. can do. Then, when restarting the combustion operation of the gas burner at the time of the temperature control, by simply controlling the blower fan to operate at the low rotation speed, a simple blow is performed, but the flow rate is small. It is possible to reduce a situation in which the user feels a cool wind every time the combustion operation of the gas burner is started during the adjustment control.

In the second aspect of the present invention, the operation control of the blower fan at the low rotation speed by the fan control means may be performed for a predetermined time. In the case where a rotation speed detecting means for detecting the rotation speed of the blower fan is provided, the rotation speed is set to be lower than the rotation speed of the blower fan during the prepurge when the operation start of the heating operation is instructed by the operation switch. The predetermined rotation speed may be set as the target rotation speed until the detected rotation speed of the rotation speed detecting means substantially matches the target rotation speed.

In the first and second aspects of the invention, the blower fan may be stopped while the gas burner is extinguished during the temperature control, or the indoor air may be continuously supplied. It may be operated with a small amount of air for convection.

Next, according to a third aspect of the gas warm air heater of the present invention, in order to achieve the above object, a gas burner housed in a main body case and indoor air are sucked into the main body case. A blower fan that blows out the sucked air together with the combustion hot air of the gas burner, a room temperature detecting unit that detects a room temperature, an operation switch that instructs operation / stop of a heating operation, and a heating operation commanded by the operation switch. Combustion control means for intermittently performing combustion and extinguishing of the gas burner in accordance with the detected room temperature so as to perform temperature control for causing a room temperature detected by the room temperature detection means to substantially match a set temperature; and A fan control means for controlling the blower fan so as to have an air flow corresponding to the combustion amount of the gas burner, wherein the fan control means comprises: When the start of the heating operation is instructed by the operation switch, the blower fan is operated so as to perform a prepurge in the main body case for a predetermined period before the combustion of the gas burner is started, and the gas burner at the time of the temperature control is controlled. When the blower fan is continuously operated to make convection of the room air during the fire extinguishing, and when it is time to restart the combustion operation while extinguishing the gas burner,
Means for controlling the blower fan so as to temporarily stop the blower fan, wherein the combustion control means, when instructed to start a heating operation by the operation switch, performs combustion of the gas burner after the prepurge. In addition to starting the operation, when restarting the combustion of the gas burner during the temperature control, the combustion operation of the gas burner is started immediately after the stop control of the blower fan is completed.

According to the third aspect of the present invention, similarly to the first aspect, after the prepurge by the blower fan, the combustion operation of the gas burner is started, and the temperature at which the combustion and extinguishing of the gas burner are intermittently performed. Key control is performed. In this case, if the gas burner is extinguished during temperature control,
The blower fan is operated by fan control means to continuously convect the room air. Then, when the room temperature decreases during the extinguishing of the gas burner at the time of the temperature control and the timing to restart the combustion operation of the gas burner comes, the fan control means stops the blowing fan once. The blower fan is controlled, and the combustion control means starts the combustion operation of the gas burner immediately after the termination of the stop control. In this case, by controlling the blower fan to stop before the start of the combustion operation of the gas burner, it is possible to avoid a situation in which a user feels a cool air when restarting the combustion operation of the gas burner which is repeatedly performed during the temperature control. You. Further, after the stop control by the fan control means, the blower fan starts the combustion operation of the gas burner,
At this time, the airflow of the blower fan is not immediately increased to the airflow corresponding to the combustion amount of the gas burner, but is controlled so that the airflow corresponds to the airflow corresponding to the combustion amount. Is generated. For this reason, when restarting the combustion operation of the gas burner during temperature control, the air volume of the blower fan at the start of the combustion becomes smaller than the combustion volume of the gas burner, and lift of combustion flame and generation of odor , The combustion operation of the gas burner is started satisfactorily.

Therefore, according to the third aspect of the present invention, when restarting the combustion operation of the gas burner at the time of the temperature control, the combustion operation of the gas burner is started after controlling the blower fan to be stopped once. Thus, similarly to the first aspect, the combustion of the gas burner can be started while preventing the lift of the combustion flame and the generation of odor. Then, when restarting the combustion operation of the gas burner at the time of temperature control, by controlling to temporarily stop the blower fan, a sense of cold air is given to the user every time the combustion operation of the gas burner at the time of temperature control is started. Such a situation can be avoided.

In the third aspect of the present invention, the stop control of the blower fan by the fan control means may be performed for a predetermined time, or the rotation of the blower fan may be controlled. In the case where the number of revolutions detecting means for detecting the number is provided, the operation may be performed until the number of revolutions detected by the number of revolutions detecting means becomes substantially zero.

[0030]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the first aspect of the present invention will be described with reference to FIGS.

Referring to FIG. 1, a gas hot air heater (gas fan heater) of the present embodiment includes a duct 2, a blower fan 3, a gas burner 4,
A duct 5, a gas supply pipe 6, and a control unit 7 are provided.

The duct 2 constitutes an air passage for hot air. The air inlet 8 for taking in room air is opened at the back of the main body case 1. 9 is open. In order to prevent dust and dirt from flowing into the duct 2, the air filter 1
0 is detachably attached. A movable louver 11 for adjusting the opening degree is attached to the outlet 9,
Gad motor 1 for driving this movable louver 11
2 are provided. In addition, the intake port 8 inside the duct 2
A room temperature sensor 13 (room temperature detecting means) constituted by a thermistor facing the air inlet 8 is attached to a nearby location, and the room temperature sensor 13 outputs a signal corresponding to the room temperature to the control unit 7.

The blower fan 3 has a fan motor 14 whose number of revolutions changes in proportion to the supplied current, and rotating blades 15 arranged in the duct 2 facing the outlet 9 and driven to rotate by the fan motor 14. Then, the indoor air s is sucked into the duct 2 from the intake port 8 by the rotation of the rotary blade 15. Then, the sucked indoor air s is mixed with the combustion exhaust gas h (combustion hot air) of the gas burner 4 incorporated in the duct 2 and is blown into the room through the outlet 9 as warm air m. The blower fan 3 is provided with a rotation speed sensor 16 (rotation speed detecting means) constituted by a Hall element or the like for detecting the rotation speed, and the rotation speed sensor 16 corresponds to the rotation speed of the fan motor 14. The signal is output to the control unit 7.

Gas burner 4 incorporated in duct 2
Has an ignition electrode 19 for arranging a combustion plate 18 in a combustion cylinder 17 and igniting a mixture of combustion air and fuel gas.
Is disposed downstream of the combustion plate 18. The combustion cylinder 17 of the gas burner 4 is disposed in the duct 2, and the combustion exhaust h is discharged from the combustion cylinder 17 into the duct 2. A thermocouple 20 for detecting the presence or absence of a combustion flame is disposed downstream of the combustion plate 18.
An electromotive force is generated while being exposed to the combustion flame of the gas burner 4, and the generated electromotive force is output to the control unit 7.

The duct 5 is a passage for supplying the indoor air s (combustion air) and the fuel gas to the gas burner 4, and communicates with the inside of the combustion cylinder 17 of the gas burner 4 and the duct 2
Is incorporated in the main body case 1 and the main body case 1
Has an air intake port 21 for room air s which is open at the back of the vehicle. A nozzle 22 attached to the tip of the gas supply pipe 6 is provided at a location on the gas burner 4 side of the duct 5. The indoor air s is sucked into the duct 5 from the intake port 21 by the rotation of the blower fan 3, and the sucked indoor air s is mixed with the fuel gas ejected from the nozzle 22 of the gas supply pipe 6. The mixture is supplied to the gas burner 4. The air inlet 21 is covered by the air filter 10 together with the air inlet 8 of the duct 2.

The gas supply pipe 6 is provided with solenoid valves 24 and 25 and a solenoid proportional valve 26 in this order from the upstream side.

The solenoid valves 24 and 25 open when energized, and allow fuel gas to pass in the direction of the nozzle 22 when the valve is open, and shut off fuel gas when closed when the energization is stopped.

The solenoid proportional valve 26 is a valve whose opening increases in accordance with the magnitude of the energizing current.
Is proportional to the amount of gas supplied.

An operation switch 2 is provided on the outer surface of the main body case 1.
7, a room temperature setting switch 28 and a filter lamp 29 are provided.

The operation switch 27 instructs the control unit 7 to start or end the heating operation by ON / OFF operation.

The room temperature setting switch 28 is an operation switch for setting the room temperature, and instructs the control unit 7 to raise or lower the set room temperature by, for example, 1 ° C. by a predetermined operation.

The filter lamp 29 is connected to the air filter 10.
When the air volume at the time of the rotation operation of the blower fan 3 is reduced to some extent as compared with a normal case such as when clogging of the air is progressing, the light is turned on by the energization control of the control unit 7. Notify the user of the necessity of cleaning, etc.

Referring to FIG. 2, the control unit 7 is constructed using a microcomputer or the like. The major functional components are roughly classified into a combustion control unit 30 (combustion control means) and a fan. Control unit 31 (fan control means)
Is provided.

The combustion control unit 30 is provided with instruction signals of the operation switch 27 and the room temperature setting switch 28 and the room temperature sensor 1
3 and the gas supply pipe 6 based on the detection signal of the thermocouple 20 and the like.
Solenoid valves 24 and 25, electromagnetic proportional valve 26 and ignition electrode 19
By controlling the energization of the gas burner 4, combustion control of the gas burner 4, such as ignition and extinguishing of the gas burner 4 and adjustment of the combustion amount (adjustment of the supply amount of fuel gas), is performed.

The fan control unit 31 controls the energization of the fan motor 14 based on the instruction signals of the operation switch 27 and the room temperature setting switch 28 and the detection signals of the room temperature sensor 13 and the rotation speed sensor 16, so that the fan 3 By controlling the number of revolutions, the air volume of the blower fan 3 including the combustion air to the gas burner 4 is controlled. In the present embodiment, when controlling the rotation speed of the blower fan 3, the detected rotation speed of the blower fan 3 (= detection rotation speed of the fan motor 14) obtained by the rotation speed sensor 16 is set to a required target rotation speed. The amount of current supplied to the fan motor 14 is feedback-controlled so as to match.

The control by these control units 30 and 31 is as follows.
Although the details will be described later, the processing is performed according to a predetermined sequence.

Next, the operation of the gas hot air heater of the present embodiment will be described with reference to FIG.

When the user turns on the operation switch 27 to perform the heating operation, first, the fan control unit 31 of the control unit 9 performs the pre-purge in the main body case 1 (in the ducts 2 and 5) accordingly. As shown by the solid line in FIG. 3A, the blower fan 3 is rotated at, for example, its maximum rotation speed (for example, 1000 rpm, which corresponds to the maximum combustion amount of the gas burner 4 in this embodiment). The power supply to the fan motor 14 is controlled at this time, and this state is continued for a predetermined time (for example, 3 seconds). By controlling the energization of the fan motor 14 as described above, the blower fan 3 operates at its maximum rotation speed, and blows at the maximum air flow rate.
The ducts 2 and 5 are pre-purged including the gas burner 4. By this pre-purge, if gas components, dust, and the like that hinder the combustion of the gas burners 4 stay in the ducts 2 and 5, they are discharged. The actual rotation speed of the blower fan 3 depends on the fan motor 14 and the rotating blades 1.
Due to the inertia of 5, as shown by the broken line in FIG.
With a slight delay, it rises to the maximum speed.

Next, when the predetermined time has elapsed since the energization of the fan motor 14 and the pre-purge is completed, the combustion operation of the gas burner 4 is started (start of the ignition operation) as follows. You. That is, the combustion control unit 30 of the control unit 9 energizes the electromagnetic valves 24 and 25 to open them, and starts the combustion of the gas burner 4 at its maximum combustion amount as shown in FIG. The electromagnetic proportional valve 26 is energized to maximize the amount of fuel gas supplied to the gas burner 4), and further, a spark discharge is generated at the ignition electrode 19. Further, in order to secure the air volume of the blower fan 3 corresponding to the maximum combustion amount of the gas burner 4, the fan control unit 31 continues to operate the blower fan 3 at its maximum rotational speed as shown in FIG. The energization of the fan motor 14 is controlled so as to rotate.

As a result, the gas burner 4 is ignited,
The combustion starts. And the gas burner 4
When the combustion of the fan 3 starts, the combustion exhaust h
Is mixed with the room air s sucked into the duct 2 and is blown out as warm air m from the outlet 9 into the room.

The above-described combustion at the maximum combustion amount of the gas burner 4 and the accompanying blowing at the maximum air amount of the blower fan 3 stabilize the combustion of the gas burner 4 and detect the combustion flame by the thermocouple 20. In order to ensure that the ignition is performed, the ignition operation of the gas burner 4 is started for a predetermined time (for example, 10 seconds), and the room temperature is set to the room temperature setting switch after the elapse of the predetermined time. Temperature control is started to make the room temperature substantially equal to the set room temperature set at 28.

In this temperature control, the combustion control unit 30 adjusts the temperature as the room temperature detected by the room temperature sensor 13 approaches the set room temperature.
Based on these deviations, as shown in FIG. 3B, the amount of combustion of the gas burner 4 is reduced stepwise (the amount of fuel gas supplied to the gas burner 4 is reduced stepwise). 3) The energization control of the electromagnetic proportional valve 26 is performed. Similarly, the fan control unit 31 makes the rotation speed of the blower fan 3 correspond to the combustion amount of the gas burner 4 as shown in FIG. Fan motor 1 so as to gradually decrease
4 is energized. As described above, the combustion amount of the gas burner 4 and the rotation speed of the blowing fan 3 corresponding thereto (the blowing fan 3
The reason for this is that if the amount of combustion of the gas burner 4 and the amount of air of the blower fan 3 corresponding to the amount are rapidly reduced, the user may feel uncomfortable. is there.

In this way, the combustion amount of the gas burner 4 and the rotation speed of the blower fan 3 corresponding to the combustion amount are reduced stepwise as the room temperature rises, and they are reduced to a predetermined minimum combustion amount Ma during combustion. And minimum rotation speed Na
When the room temperature detected by the room temperature sensor 13 rises to a temperature slightly higher than the set temperature (hereinafter, referred to as a combustion interruption temperature) in a state where the temperature has been lowered to FIG.
In this case, the combustion control unit 30 stops the combustion operation of the gas burner 4 in order to suspend the combustion operation.
As shown in FIG. 3B, the power supply to the solenoid proportional valve 26 is stopped, and the power supply to the solenoid valves 24 and 25 is also stopped to close them, thereby extinguishing the gas burner 4. Also,
At the same time, the fan control unit 31 controls the energization of the fan motor 14 so as to continuously rotate the blower fan 3 at a very low speed Nb (for example, 400 rpm) lower than the minimum speed Na (for example, 500 rpm) during the combustion. I do.

Thus, while the combustion operation of the gas burner 4 is interrupted, the blower fan 3 continues to operate at the above-mentioned low speed Nb even after the interruption of the combustion operation of the gas burner 4. In this case, during operation of the blower fan 3 at the low speed Nb,
Although only mere air is blown into the room, the amount of air is very small and does not give the user a feeling of cool air. Further, by the operation of the blower fan 3 at the low speed Nb after the interruption of the combustion operation of the gas burner 4, the residual heat in the main body case 1 is dissipated (post purge is performed), and at the same time, the gas burner 4 During the fire extinguishing, the room air is continuously convected, the temperature distribution is made uniform, and the room temperature sensor 1 is used for restarting the combustion operation described later.
The detection room temperature of 3 becomes accurate. In the present embodiment, in order to prevent the user from feeling uncomfortable due to the sudden change in the combustion amount of the gas burner 4 or the air volume of the blower fan 3, it is necessary to gradually reduce them. Therefore, even if the room temperature detected by the room temperature sensor 13 rises above the combustion interruption temperature during the lowering, the combustion operation of the gas burner 4 is not immediately interrupted, and the minimum combustion amount Ma and the minimum rotation speed during the combustion are reduced. Gas burner 4 after decreasing to Na
The combustion operation of is stopped.

Next, while the gas burner 4 is extinguished as described above, and the blower fan 3 is operating at the low speed Nb, the room temperature drops, and the room temperature detected by the room temperature sensor 13 becomes lower than the combustion interruption temperature. When the temperature is lowered to a slightly lower temperature (hereinafter, referred to as the combustion restart temperature) (the operation restart timing in FIG. 3), the combustion control unit 30 immediately energizes the solenoid valves 24 and 25 and accordingly energizes them. And the gas burner 4 as shown in FIG. 3 (b).
The electromagnetic proportional valve 26 is energized so as to start the combustion at the maximum combustion amount, and a spark discharge is generated in the ignition electrode 9. Further, as shown in FIG. 3A, immediately after the operation restart timing, the fan control unit 31 sends the blower fan 3 at the maximum rotation speed corresponding to the maximum combustion amount of the gas burner 4.
The energization of the fan motor 14 is controlled so as to operate.
Therefore, in this case, the operation switch 27 is turned ON, and the pre-purge such as when starting the heating operation is not performed.

As a result, when the room temperature falls to the combustion restart temperature, the gas burner 4 is immediately ignited, and combustion at the maximum combustion amount is started. After that, as before,
After the combustion at the maximum combustion amount of the gas burner 4 and the blowing at the maximum rotation speed of the blower fan 3 corresponding to the combustion are performed continuously for a predetermined time, the combustion amount and the air amount are gradually reduced step by step. When the room temperature detected by the room temperature sensor 13 becomes equal to or higher than the combustion interruption temperature, the combustion operation of the gas burner 4 is interrupted and the blower fan 3 is controlled to operate at the low speed Nb, so that the combustion and extinguishing of the gas burner 4 is intermittent. Is repeated. As a result, the temperature control is performed so that the room temperature substantially matches the set room temperature.

In the operation for restarting the combustion operation of the gas burner 4 as described above, the operation switch 27 is turned ON to start the air supply during the start of the combustion operation of the gas burner 4 such as when starting the heating operation. Since the combustion operation of the gas burner 4 is started immediately without performing the prepurge for operating the fan 3 at the maximum rotation speed, when the gas burner 4 is ignited, the fan control unit 31 performs the above-described operation as indicated by the solid line in FIG. Immediately after the operation restart timing (when the detected room temperature drops to the combustion restart temperature), the power supply to the fan motor 14 is controlled so that the blower fan 3 is operated at the maximum rotation speed. However, since the blower fan 3 was operating at the very low speed Nb before that, the inertia caused by the inertia shown in FIG.
As shown by a broken line, there is a delay in increasing the actual rotation speed of the blower fan 3 to the maximum rotation speed. Therefore, at the time of ignition when restarting the combustion operation of the gas burner 3, the combustion amount (maximum combustion amount) of the gas burner 4 according to the energization control of the electromagnetic proportional valve 26 by the combustion control unit 30 (see FIG. 3B). On the other hand, it becomes less.

As a result, the gas burner 4 starts the combustion satisfactorily while preventing the lift of the combustion flame and the generation of odor. Therefore, every time the combustion operation of the gas burner 4 is restarted during the temperature control (the restart of the combustion operation is repeated many times during the heating operation), a situation in which the lift of the combustion flame of the gas burner 4 or the generation of odor occurs. Can be avoided.

When restarting the combustion operation of the gas burner 4 during the temperature control, the prepurge for operating only the blower fan 3 is not performed as in the case of starting the heating operation in accordance with the ON operation of the operation switch 27. The fire extinguishing state of the gas burner 4 during the temperature control is relatively short, and during the fire extinguishing, there is no occurrence of a situation in which gas components and dust etc. which cause trouble stay in the ducts 2 and 5, and the fire is already normal. In this state, the gas warm air heater operates. In particular, in this embodiment, the ventilation fan 3 is continuously operated at the low speed Nb even during the extinguishing of the gas burner 4, so that the ventilation in the ducts 2 and 5 is also performed. Therefore, the combustion operation of the gas burner 4 can be restarted without any trouble without performing the pre-purge as in the start of the heating operation.

Further, since the combustion operation of the gas burner 4 is restarted immediately when the detected room temperature falls to the combustion restart temperature, the blowing of warm air is promptly restarted in accordance with the decrease in room temperature.
Therefore, each time the combustion operation is restarted in response to the decrease in the room temperature, the user is not affected by a feeling of cool air for a short time.

In this embodiment, while the gas burner 4 is extinguished, the blower fan 3 is continuously operated at the low speed Nb. However, after the gas burner 4 stops burning, the blower fan 3 is turned on for a predetermined time. After operating at an appropriate rotation speed and performing post-purging, the blower fan 3 is stopped,
When restarting the combustion operation, the blower fan 3 may be raised from the stopped state to a rotation speed corresponding to the combustion amount at the time of ignition of the gas burner 4.

Next, an embodiment of the second aspect of the present invention will be described with reference to FIG. It should be noted that the gas hot air heater of this embodiment has the same system configuration as that of the embodiment of the first aspect, and differs only in the operation. The description will be omitted by using the same reference numerals as those in FIG.

Referring to FIG. 4, in the gas hot air heater of the present embodiment, just like in the first embodiment, the operation switch 27 is turned ON, so that the prepurge by the blower fan 3 is performed. After the operation, the combustion operation of the gas burner 4 is started to blow hot air, and further, after the combustion amount of the gas burner 4 and the air flow of the blower fan 3 are stepwise reduced in the temperature control, the room temperature is reduced. When the room temperature detected by the sensor 13 rises to the combustion interruption temperature, the gas burner 4 is extinguished, and the blower fan 3 is controlled at the low speed Nb.

On the other hand, during the extinguishing of the gas burner 4 during the temperature control, when the room temperature decreases and the room temperature detected by the room temperature sensor 13 decreases to the combustion restart temperature (operation restart timing in FIG. 4), first, the fan control is started. As shown by the solid line in FIG. 4A, the unit 31 temporarily changes the rotation speed of the blower fan 3 to a rotation speed Nc (for example, the rotation speed N
c is lower than the pre-purge rotation speed (= maximum rotation speed) at the start of the heating operation by the ON operation of the operation switch 27)
Is supplied to the fan motor 14 so that the fan motor 14 is controlled. Then, after a predetermined time (for example, 5 seconds) elapses after the start of energization, the combustion control unit 30 starts the combustion of the gas burner 4 in the same manner as in the case of restarting the combustion operation in the embodiment of the first aspect. Are controlled to energize the electromagnetic valves 24 and 25, the electromagnetic proportional valve 26, and the ignition electrode 19 so that the gas burner 4 starts operating at the maximum combustion amount.
The energization control of the fan motor 14 is performed so that the blower fan 3 is operated at the maximum rotation speed corresponding to the maximum combustion amount. Thereafter, the combustion and extinguishing of the gas burner 4 are repeated as in the embodiment of the first aspect, and the above-described control is performed when the combustion is restarted.

In the gas warm air heater of the present embodiment, when restarting the combustion operation of the gas burner 4 during the temperature control, the blower fan 3 is once set to a low rotation speed before the combustion of the gas burner 4 is started. Although it is controlled to operate at Nc, the number of revolutions Nc is the number of revolutions at the time of prepurge when starting the heating operation in response to the ON operation of the operation switch 27 (=
Rotation speed). For this reason, when the gas burner 4 is ignited following the control of the blower fan 3, the fan control unit 31 controls the fan motor 14 so as to operate the blower fan 3 at the maximum rotation speed in response to the ignition. Due to inertia, there is a delay in increasing the actual rotation speed of the blower fan 3 to the maximum rotation speed as shown by a broken line in FIG. Therefore, similarly to the embodiment of the first aspect, at the time of ignition at the time of restarting the combustion operation of the gas burner 3, the energization control of the electromagnetic proportional valve 26 by the combustion control unit 30 (see FIG. 4B). The combustion amount (maximum combustion amount) of the corresponding gas burner 4 becomes smaller, and the gas burner 4 starts combustion satisfactorily while preventing lift of combustion flame and generation of odor. Therefore, every time the combustion operation of the gas burner 4 is restarted at the time of the temperature control, it is possible to avoid a situation in which the combustion flame of the gas burner 4 is lifted or an odor is generated.

When restarting the combustion operation of the gas burner 4 during the temperature control, a large air flow for operating the blower fan 3 at the maximum number of revolutions as in the start of the heating operation according to the ON operation of the operation switch 27 is used. Although the prepurge is not performed, as in the case of the embodiment of the first aspect, the gas burner 4 is extinguished at a large air volume such as at the start of the heating operation due to a relatively short fire extinguishing time of the gas burner 4 during temperature control. , The combustion operation of the gas burner 4 can be restarted without any trouble.

Further, the rotation speed Nc of the blower fan 4 operated before restarting the combustion operation of the gas burner 4 during the temperature control.
Is sufficiently smaller than the number of revolutions (maximum number of revolutions) at the time of pre-purge at the start of the heating operation in accordance with the ON operation of the operation switch 27, so that the user is required Thus, the large air volume of the blower fan 4 does not give a sense of cool air (the cool air sense exerted on the user can be reduced by operating only the blower fan 4 when the combustion of the gas burner 4 is restarted).

In this embodiment, the blower fan 3 is continuously operated at the low speed Nb during the extinguishing of the gas burner 4 during the temperature control. After performing the post-purge by operating the fan 3 at an appropriate rotation speed for a predetermined time, the blower fan 3 is stopped, and when restarting the combustion operation, the blower fan 3 is operated at the rotation speed Nc from the stopped state. May be controlled as follows.

Further, in this embodiment, when restarting the combustion operation of the gas burner 4 during the temperature control, the blower fan 3 is operated at a rotation speed Nc lower than the very low speed Nb of the blower fan 3 during the extinguishing of the gas burner 4. FIG. 4
As shown by the imaginary line a in (a), the blower fan is operated at a speed slightly higher than the low speed Nb and sufficiently lower than the speed of the blower fan 3 in the prepurge at the start of the heating operation. 3 may be controlled.
Alternatively, as shown by a virtual line b in FIG. 4A, the rotation speed of the blower fan 3 is gradually changed to a rotation speed lower than the rotation speed of the blower fan 3 in the prepurge at the start of the heating operation. May be controlled.

In this embodiment, when the combustion operation of the gas burner 4 is restarted, the rotation speed of the blower fan 3 is once increased.
The time for controlling to the rotation speed Nc is a predetermined time (constant time)
However, in the present embodiment, since the rotation speed sensor 16 for detecting the rotation speed of the blower fan 3 is provided, when restarting the combustion operation of the gas burner 4, the rotation speed Nc is set as the target rotation speed, and the blower fan 3 Is the rotation speed Nc
The combustion operation of the gas burner 4 may be started when the detected rotation speed matches or substantially matches the rotation speed Nc.

Next, an embodiment of the third aspect of the present invention will be described with reference to FIG. It should be noted that the gas hot air heater of this embodiment has the same system configuration as that of the embodiment of the first aspect, and differs only in the operation. The description will be omitted by using the same reference numerals as those in FIG.

Referring to FIG. 5, in the gas warm air heater of the present embodiment, the prepurge by the blower fan 3 is performed by turning on the operation switch 27 just like the embodiment of the first embodiment. After the operation, the combustion operation of the gas burner 4 is started to blow hot air, and further, after the combustion amount of the gas burner 4 and the air flow of the blower fan 3 are stepwise reduced in the temperature control, the room temperature is reduced. When the room temperature detected by the sensor 13 rises to the combustion interruption temperature, the gas burner 4 is extinguished, and the blower fan 3 is controlled at the low speed Nb.

On the other hand, during the extinguishing of the gas burner 4 during the temperature control, when the room temperature decreases and the room temperature detected by the room temperature sensor 13 decreases to the combustion restart temperature (operation restart timing in FIG. 5), first, the fan control is started. The unit 31 controls the fan motor 14 so as to temporarily stop the blower fan 3 as shown by a solid line in FIG. 5A (stops power supply to the fan motor 14). When a predetermined time (for example, 5 seconds) elapses after the start of the stop control,
Similar to the case of restarting the combustion operation in the embodiment of the first aspect, the combustion control unit 30 controls the solenoid valves 24 and 25 and the solenoid proportional valves 26 and 26 to start the combustion of the gas burner 4 at the maximum combustion amount. The energization control of the ignition electrode 19 is performed, and the fan control unit 31 controls the energization of the fan motor 14 so as to operate the blower fan 3 at the maximum rotation speed corresponding to the maximum combustion amount of the gas burner 4. Thereafter, the combustion and extinguishing of the gas burner 4 are repeated as in the embodiment of the first aspect, and the above-described control is performed when the combustion is restarted.

In the gas warm air heater of this embodiment, when restarting the combustion operation of the gas burner 4 during the temperature control, the blower fan 3 is temporarily stopped before the combustion of the gas burner 4 is started. Therefore, when the gas burner 4 is subsequently ignited, the fan control unit 31
Even if the fan motor 14 is energized so as to operate the blower fan 3 at the maximum rotation speed, the inertia of FIG.
As shown by the broken line in (a), there is a delay in increasing the actual rotation speed of the blower fan 3 to the maximum rotation speed. Therefore,
As in the case of the embodiment of the first aspect, at the time of ignition when restarting the combustion operation of the gas burner 3, the combustion control unit 30
The amount of combustion (maximum combustion amount) of the gas burner 4 in accordance with the energization control of the electromagnetic proportional valve 26 (see FIG. 5B) is reduced, and the gas burner 4 generates lift of combustion flame and generation of odor. The combustion starts well while being prevented. Therefore, every time the combustion operation of the gas burner 4 is restarted at the time of the temperature control, it is possible to avoid a situation in which the combustion flame of the gas burner 4 is lifted or an odor is generated.

When restarting the combustion operation of the gas burner 4 during the temperature control, the prepurge is not performed as in the case of starting the heating operation according to the ON operation of the operation switch 27, but the first embodiment is performed. As in the case of the embodiment, the combustion operation of the gas burner 4 is restarted without any trouble without performing the prepurge such as at the start of the heating operation because the fire extinguishing time of the gas burner 4 during the temperature control is relatively short. be able to.

Further, before restarting the combustion operation of the gas burner 4 at the time of the temperature control, the blower fan 4 operating at the low speed Nb is temporarily stopped, so that the combustion of the gas burner 4 at the time of the temperature control is restarted. In addition, there is no possibility of giving the user a feeling of cold wind.

In the present embodiment, when restarting the combustion operation of the gas burner 4, the time for controlling the blower fan 3 to temporarily stop is set to a predetermined time (constant time).
After the stop control is started, the combustion operation of the gas burner 4 is started when the rotation speed detected by the rotation speed sensor 16 becomes substantially zero (when the rotation speed detected falls below a predetermined rotation speed). You may.

Further, in each of the embodiments described above, the gas warm air heater having the rotation speed sensor 16 of the blower fan 3 and controlling the rotation speed of the blower fan 3 has been described. It is needless to say that the present invention can be applied to a gas hot air heater that controls a blower fan in a so-called open loop manner.

[Brief description of the drawings]

FIG. 1 is a system configuration diagram of an embodiment of a gas warm air heater according to the present invention.

FIG. 2 is a block diagram of a main part of the gas hot air heater of FIG. 1;

FIG. 3 is a diagram for explaining the operation of the embodiment of the first mode in the configuration of the gas hot air heater of FIGS. 1 and 2;

FIG. 4 is a diagram for explaining the operation of the embodiment of the second mode in the configuration of the gas hot air heater of FIGS. 1 and 2;

FIG. 5 is a diagram for explaining the operation of the embodiment of the third aspect in the configuration of the gas warm air heater of FIGS. 1 and 2;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Body case, 3 ... Blow fan, 4 ... Gas burner, 2
7: operation switch, 30: combustion control unit, 31: fan control unit.

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Junichi Maeda 2-26, Fukuzumi-cho, Nakagawa-ku, Nagoya-shi, Aichi Rinnai Co., Ltd. (72) Inventor Kuniyoshi Sakakibara 2-26, Fukuzumi-cho, Nakagawa-ku, Nagoya-shi, Aichi Rinnai (56) References JP-A-6-281136 (JP, A) JP-A-1-219416 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) F24H 3/04 305 F23N 3/08 F23N 5/02 320 F23N 5/20 101

Claims (6)

(57) [Claims] A gas burner housed in a main body case;
A blower fan that sucks indoor air into the main body case and blows out the sucked air together with the combustion hot air of the gas burner, a room temperature detecting unit that detects a room temperature, an operation switch that instructs operation / stop of a heating operation, During the heating operation instructed by the operation switch, combustion and extinguishing of the gas burner are performed intermittently in accordance with the detected room temperature in order to perform temperature control to make the room temperature detected by the room temperature detection means substantially coincide with the set temperature. In a gas warm air heater comprising: a combustion control unit; and a fan control unit that controls the blower fan so that an air volume corresponds to a combustion amount of the gas burner during combustion of the gas burner. When the start of the heating operation is instructed by the operation switch, the prepurge in the main body case is performed for a predetermined period before the combustion of the gas burner is started. The blower fan is operated to perform the operation, and when it is time to restart the combustion operation during the extinguishing of the gas burner during the temperature control, the blower fan is rotated once lower than at the time of the prepurge. Means for controlling the blower fan so as to operate at a number of times, wherein the combustion control means starts a combustion operation of the gas burner after the prepurge when an operation start of a heating operation is instructed by the operation switch. In addition, when restarting the combustion of the gas burner at the time of the temperature control, a means for starting the combustion of the gas burner immediately after the end of the operation control of the blower fan at the low rotation speed is provided. And gas hot air heater. 2. The gas hot air heater according to claim 1, wherein the operation control of the blower fan at the low rotation speed by the fan control means is performed for a predetermined period of time. 3. An operation control of the blower fan at the low rotation speed by the fan control unit, comprising: a rotation speed detection unit for detecting a rotation speed of the blower fan, wherein the operation switch starts the heating operation by the operation switch. A state in which the detected rotation speed of the rotation speed detecting means substantially matches the target rotation speed, with a predetermined rotation speed determined to be lower than the rotation speed of the blower fan during the prepurge when instructed as the target rotation speed. 2. The gas hot air heater according to claim 1, wherein the heating is performed until the temperature is reduced. 4. A gas burner housed in a main body case,
A blower fan that sucks indoor air into the main body case and blows out the sucked air together with the combustion hot air of the gas burner, a room temperature detecting unit that detects a room temperature, an operation switch that instructs operation / stop of a heating operation, During the heating operation instructed by the operation switch, combustion and extinguishing of the gas burner are performed intermittently in accordance with the detected room temperature in order to perform temperature control to make the room temperature detected by the room temperature detection means substantially coincide with the set temperature. In a gas warm air heater comprising: a combustion control unit; and a fan control unit that controls the blower fan so that an air volume corresponds to a combustion amount of the gas burner during combustion of the gas burner. When the start of the heating operation is instructed by the operation switch, the prepurge in the main body case is performed for a predetermined period before the combustion of the gas burner is started. The blower fan is operated to perform the operation, the blower fan is continuously operated so as to convect room air while the gas burner is extinguished during the temperature control, and the combustion operation is restarted while the gas burner is extinguished. When it is time to provide, the apparatus further comprises means for controlling the blower fan so as to temporarily stop the blower fan in response thereto, wherein the combustion control means is provided when the operation start of the heating operation is instructed by the operation switch. Then, the combustion operation of the gas burner is started after the prepurge, and at the time of restarting the combustion of the gas burner during the temperature control, the combustion of the gas burner is started immediately after the stop control of the blower fan is completed. A gas warm air heater characterized by comprising means. 5. The gas warm air heater according to claim 4, wherein the control of stopping the blower fan by the fan control means is performed for a predetermined period of time. 6. A rotation speed detecting means for detecting a rotation speed of the blower fan, wherein the fan control means stops the blower fan until the detected rotation speed of the rotation speed detection device becomes substantially zero. The gas warm air heater according to claim 4, characterized in that: