WO2011162206A1

WO2011162206A1 - Air-conditioning system

Info

Publication number: WO2011162206A1
Application number: PCT/JP2011/064064
Authority: WO
Inventors: 明由杉山
Original assignee: 東芝キヤリア株式会社
Priority date: 2010-06-25
Filing date: 2011-06-20
Publication date: 2011-12-29
Also published as: JPWO2011162206A1; JP5470457B2

Abstract

A remote controller displays the details of control conditions to be changed, and displays the type of unit to be changed in the event of a configuration change process that changes the control conditions of a specified unit.

Description

Air conditioning system

The embodiment relates to an air conditioning system having a plurality of types of units such as an indoor unit and a ventilation unit and a remote controller, for example.

In addition to indoor units that perform cooling, dehumidification, heating, and the like, an air conditioning system that includes a ventilation unit that ventilates the room and manages the indoor unit and the ventilation unit with a remote controller is known (for example, JP-A-11-83120). Issue gazette).

The indoor unit and the ventilation unit are set with control conditions, so-called control parameters, that regulate the operation and function. This control parameter can be changed as appropriate according to the installation location, environment, usage, etc. of each unit by, for example, the operator operating the remote controller during installation work.

When changing a control parameter, a code representing the content of the control parameter is displayed on the remote controller display.

However, there may be a common control parameter for the indoor unit and the ventilation unit, and the operator has changed the control parameter for the indoor unit or the ventilation unit from the code displayed on the display of the remote controller. I may not understand. In this case, an error may occur in the change of the control parameter.

The purpose of the embodiment is to properly notify the operator of which type of control unit of a plurality of types of units is being changed, thereby appropriately changing the control conditions of a plurality of types of units without error. It is to provide an air conditioning system with excellent reliability that can be done.

The air conditioning system of the embodiment includes a plurality of types of units for which control conditions are set, a remote controller for managing these units, and the remote controller, and selects each unit according to the operation of the remote controller. Setting change processing means for changing the control conditions of the specified unit according to the operation of the remote controller, and the remote controller, and when changing the control conditions by the setting change processing means, Display control means for displaying the contents of the control condition and the type of the unit to be changed.

The figure which shows the whole structure of one Embodiment. The figure which shows the display part and operation part of the remote controller of one Embodiment. The flowchart which shows control of the remote controller of one Embodiment. The figure which shows the data file in one Embodiment. The figure which shows the display of the remote controller in the case of changing the control conditions of the 1st indoor unit of one Embodiment. The figure which shows the display of the remote controller in the case of changing the control conditions of the 2nd indoor unit of one Embodiment. The figure which shows the display of a remote controller in the case of changing the control conditions of the 1st all heat exchanger unit of one Embodiment. The figure which shows the display of a remote controller in the case of changing the control conditions of all the heat exchanger units of one Embodiment all at once.

Hereinafter, an embodiment will be described with reference to the drawings.
As shown in FIG. 1, a plurality of types of units such as

indoor units

11, 12, and 21 of the air conditioners 1 and 2 and a ventilation unit such as total

heat exchange units

31 and 32 are connected to a remote controller 50 via signal lines, and an air conditioning system Configure.

The air conditioner 1 is a multi-type air conditioner having one outdoor unit 10 and two indoor units 11 and 12 having unit numbers “1-1” and “1-2”. The air conditioner 2 includes one outdoor unit 20 and one indoor unit 21 having a unit number “2-1”. The total

heat exchange units

31 and 32 include a fan, a discharge path for indoor air, an introduction path for outside air, a total heat exchanger that transfers heat of the discharge air to the introduction air, and the like. The

indoor units

11, 12, 21 and all the

heat exchange units

31, 32 have some common parts and functions, and one of them is, for example, a wind direction adjusting flap.

Each of the

indoor units

11, 12, 21 and all the

heat exchange units

31, 32 has an MCU 41 as a control unit, and also has an electrically rewritable nonvolatile memory 42 as a storage unit. In these memories 42, setting data of control conditions of each unit, so-called various control parameters, is stored in an updatable manner. The control parameter is composed of an item code representing the part or function to be controlled and the setting data. The setting data includes a set value that defines the operation and function of the control target, and an upper limit value and a lower limit value that define upper and lower limits of the set value.

The remote controller 50 includes an MCU 51 serving as a control unit, a memory 52 serving as a storage means, a display unit 53, and an operation unit 54. The air conditioners 1 and 2 and the total

heat exchange units

31 and 32 are operated and stopped. The operation mode of the unit, the set temperature Ts of each indoor unit, the operation / stop of all the

heat exchange units

31, 32, the operation mode, and the like are managed. As shown in FIG. 2, the display unit 53 is a liquid crystal display unit provided in the upper front portion of the remote controller 50. The display unit 53 is an operation state, timer time, current time, air volume, set temperature, control parameter item code, control. The parameter setting values are displayed in text and images. The operation unit 54 is provided below the display unit 53 and inside the opening / closing cover 55, and includes

temperature setting buttons

61 and 62, a reset button 63, an operation / stop button 64, an inspection button 65,

time setting buttons

66 and 67, a set. A button 68, a swing button 69, an operation mode switching button 70, a ventilation button 71, a unit selection button 72, and the like.

The MCU 51 of the remote controller 50 has the following means (1) to (3) as main functions.
(1) When the power is turned on or reset by pressing the reset button 63, each indoor unit connected to the signal line and all the heat exchanger units are inquired all at once, and the address (unit number) and model from each unit Detecting means for detecting the address (unit number) of each unit by receiving a reply of the data on the unit and detecting the model of whether each unit is an indoor unit or a total heat exchange unit.

(2) Each indoor unit and each total heat exchange unit are selectively designated one by one based on the address detected by the detection means and in response to the pressing operation of the unit selection button 72, and the control conditions for the operation of the designated unit Setting change processing means for changing so-called control parameters in response to pressing operation of the

temperature setting buttons

61 and 62 and the like. Specifically, the setting change processing means first designates each indoor unit and each heat exchanger unit selectively based on the detected address and one by one according to the pressing operation of the unit selection button 72. Means, a second designation means for designating either the group of each indoor unit or the group of each total heat exchange unit according to the pressing operation of the ventilation button 71, and each unit of the group designated by the second designation means Based on the detected address and in accordance with the pressing operation of the unit selection button 72, the third specifying means for selectively specifying one unit and the control parameter of the unit specified by the first specifying means or the third specifying means And changing means for changing according to the pressing operation of the

setting buttons

61 and 62 and the like.

(3) When changing the control parameter by the setting change processing means, the contents of the control parameter to be changed (item code and setting data) are displayed on the display unit 53 and whether the type of the unit to be changed is an indoor unit. Display control means for determining whether it is a total heat exchange unit based on the detected model and displaying it on the display unit 53.

Next, control of the remote controller 50 will be described with reference to the flowchart of FIG.

The remote controller 50 performs initial communication for inquiring all the units connected to the signal line all at once when the power is turned on or reset by pressing the reset button 63 (YES in step 101) (step 102). Each unit that has received the inquiry reads out the address information and the model information stored in the respective memory and returns them to the remote controller 50. Upon receiving a reply from each unit, the remote controller 50 detects the address (unit number) and model of each unit, and associates the detected address and model with each unit to generate the data file of FIG. The generated data file is stored in the memory 52 (step 103).

The remote controller 50 determines that the setting change mode is set (step 104) when two predetermined buttons such as the inspection button 65 and the temperature setting button 61 are simultaneously pressed for several seconds by the operator. YES), each indoor unit and all the heat exchange units are specified in order for each pressing operation of the unit selection button 72 based on the address of the generated data file (step 105).

Then, the remote controller 50 executes the following setting change process for the designated unit (step 106).

First, as shown in FIG. 5, the remote controller 50 blinks and displays the character pattern 53a “setting” on the display unit 53, designates the first unit, and displays the unit number of the designated unit on the display unit. The unit number display pattern 53b of 53 is used to blink. FIG. 5 shows a state where the unit number “1-1” of the indoor unit 11 is blinking.

When the first indoor unit 11 is designated, the remote controller 50 requests the indoor unit 11 to transmit a control parameter. The indoor unit 11 that has received this request reads out one or more control parameters whose settings can be changed from among the various control parameters in the memory 42, and returns them to the remote controller 50. The remote controller 50 stores one or a plurality of control parameters returned from the indoor unit 11 in the memory 52 and one of the stored control parameters according to the pressing operation of the temperature setting button 61 or the temperature setting button 62. Specify in order. That is, when the remote controller 50 stores a plurality of control parameters, each of the stored control parameters is designated one by one in the forward direction each time the temperature setting button 62 for increasing is pressed, and the temperature for lowering is specified. Each time the setting button 61 is pressed, one is designated in the reverse direction.

The remote controller 50 blinks the designated control parameter item code using the temperature display pattern 53c of the display unit 53 and blinks the designated control parameter setting value using the time display pattern 53d of the display unit 53. To do. FIG. 5 shows a state where the item code “01” and the set value “0000” are blinking. When the time setting button 66 for increasing is pressed in this state, the remote controller 50 sets the set value of the designated control parameter (referred to as the first control parameter) to the upper limit value and lower limit value for the control parameter. The changed set value is blinked and displayed using the time display pattern 53d of the display unit 53 while changing in the increasing direction within the range. When the time setting button 67 for descent is pressed, the remote controller 50 changes the set value of the designated control parameter in the decreasing direction within the range of the upper limit value and the lower limit value for the control parameter, The changed set value is displayed blinking using the time display pattern 53d of the display unit 53.

When the remote controller 50 designates the next control parameter (referred to as the second control parameter) based on the pressing operation of the

temperature setting buttons

61 and 62, the remote controller 50 uses the set value displayed so far as the first control parameter in the memory 52. Is updated and stored as a set value. Then, the remote controller 50 blinks and displays the item code of the designated second control parameter using the temperature display pattern 53c of the display unit 53, and displays the set value of the designated second control parameter. The time display pattern 53d of the unit 53 is used to blink. When the time setting button 66 for increasing is pressed in this state, the remote controller 50 changes the setting value of the second control parameter in the increasing direction within the range between the upper limit value and the lower limit value for the control parameter. However, the changed set value is displayed blinking using the time display pattern 53d of the display unit 53. When the time setting button 67 for descent is pressed, the remote controller 50 changes the setting value of the second control parameter in the decreasing direction within the range between the upper limit value and the lower limit value for the control parameter. The changed set value is displayed blinking using the time display pattern 53d of the display unit 53.

When the remote controller 50 designates the next control parameter (referred to as the third control parameter) based on the pressing operation of the

temperature setting buttons

61 and 62, the remote controller 50 uses the set value displayed so far as the second control parameter in the memory 52. Is updated and stored as a set value. Then, the remote controller 50 blinks and displays the item code of the designated third control parameter using the temperature display pattern 53c of the display unit 53, and displays the set value of the designated third control parameter. The time display pattern 53d of the unit 53 is used to blink.

If it is not necessary to change the specified control parameter, the operator presses the

temperature setting buttons

61 and 62 and specifies other control parameters without pressing the

time setting buttons

66 and 67.

When the set button 68 is pressed, the remote controller 50 determines that each control parameter of the indoor unit 11 in the memory 52 has been changed. Then, the remote controller 50 sends the determined control parameters to the indoor unit 11 and updates and stores them in the memory 42. This completes the setting change process for the indoor unit 11.

Further, the remote controller 50 uses the unit number display pattern 53b of the display unit 53 as shown in FIG. 6 to designate the second unit based on the pressing operation of the unit selection button 72, for example, the indoor unit 12. “1-2” blinks and requests the indoor unit 12 to transmit control parameters. Upon receiving this request, the indoor unit 12 reads one or more control parameters whose settings can be changed from among the various control parameters in the memory 42, and returns them to the remote controller 50. The remote controller 50 stores the received one or more control parameters in the memory 52 and sequentially designates one of the stored control parameters according to the operation of the

temperature setting buttons

61 and 62.

The remote controller 50 blinks and displays the item code of the designated control parameter using the temperature display pattern 53c of the display unit 53, and uses the time display pattern 53d of the display unit 53 to display the set value of the designated control parameter. Display blinking. FIG. 6 shows the blinking display of the item code “F0” representing the flap control parameter and the set value “0002”. When the time setting button 66 for increasing is pressed in this state, the remote controller 50 sets the set value of the designated control parameter (referred to as the first control parameter) to the upper limit value and lower limit value for the control parameter. The changed set value is blinked and displayed using the time display pattern 53d of the display unit 53 while changing in the increasing direction within the range. When the time setting button 67 for descent is pressed, the remote controller 50 changes the set value of the designated first control parameter in a decreasing direction within the range of the upper limit value and the lower limit value for the control parameter. However, the changed set value is displayed blinking using the time display pattern 53d of the display unit 53.

The flap control parameter prescribes the swing movement of the flap for adjusting the wind direction. As the set value, the swing setting code “0001” for setting the standard swing (setting state at the time of shipment) is narrower than the standard. A swing setting code “0002” for setting a swing with a swing width and a swing setting code “0003” for setting a swing with a swing width wider than the standard are included. In this case, “0001” is the lower limit value and “0003” is the upper limit value.

temperature setting buttons

61 and 62, the remote controller 50 uses the set value displayed so far as the first control parameter in the memory 52. Is updated and stored as a set value. Then, the remote controller 50 blinks and displays the item code of the designated second control parameter using the temperature display pattern 53c of the display unit 53, and displays the set value of the designated second control parameter. The time display pattern 53d of the unit 53 is used to blink. When the

time setting buttons

66 and 67 are pressed in this state, the remote controller 50 changes the setting value of the second control parameter while changing it within the range between the upper limit value and the lower limit value for the control parameter. The set value is blinked using the time display pattern 53d of the display unit 53.

When the set button 68 is pressed, the remote controller 50 determines that the control parameters of the indoor unit 12 in the memory 52 have been changed. Then, the remote controller 50 sends the determined control parameters to the indoor unit 12 and updates and stores them in the memory 42. This completes the setting change processing for the indoor unit 12.

On the other hand, when designating the next unit based on the pressing operation of the unit selection button 72, for example, the total heat exchange unit 31, the remote controller 50 uses the unit number display pattern 53b of the display unit 53 as shown in FIG. “31-1” is displayed in a blinking manner, and transmission of control parameters is requested to all the heat exchange units 31. Upon receiving this request, all the heat exchange units 31 read one or more control parameters whose settings can be changed from among the various control parameters stored in the memory 42, and return them to the remote controller 50. The remote controller 50 stores the received one or more control parameters in the memory 52, and sequentially designates one of the stored control parameters according to the operation of the

temperature setting buttons

61 and 62.

The remote controller 50 blinks the designated control parameter item code using the temperature display pattern 53c of the display unit 53 and blinks the designated control parameter setting value using the time display pattern 53d of the display unit 53. To do. FIG. 7 shows a blinking display of the item code “F0” representing the flap control parameter and the set value “0000”. In this state, when the

time setting buttons

66 and 67 are pressed, the remote controller 50 sets the set value of the designated control parameter (referred to as the first control parameter) to the upper limit value and the lower limit value for the control parameter. The changed set value is blinked and displayed using the time display pattern 53d of the display unit 53. The flap control parameter defines the swing operation of the flap for adjusting the wind direction, as in the indoor unit 12.

temperature setting buttons

time setting buttons

temperature setting buttons

When the set button 68 is pressed, the remote controller 50 determines that the control parameters of all the heat exchange units 31 in the memory 52 have been set. Then, the remote controller 50 sends the determined control parameters to the entire heat exchange unit 31 and updates and stores them in the memory 42. Thus, the setting change process for all the heat exchange units 31 is completed.

When executing such setting change processing, the remote controller 50 determines from the data file whether the type of the designated unit is an indoor unit or a total heat exchange unit (step 107). If the specified unit is an indoor unit (YES in step 107), the remote controller 50 does not display anything below the temperature display pattern 53c displaying the item code as shown in FIGS. (Step 108). If the remote controller 50 is a designated all heat exchange unit (NO in step 107), as shown in FIG. 7, the character pattern 53e of “ventilation” is displayed below the temperature display pattern 53c displaying the item code. Is blinked (step 109).

In this way, when the change target is the total heat exchange unit, the character pattern 53e of “ventilation” is displayed in a blinking manner, so that the flap control of the same item code as the control parameter of each of the indoor unit 12 and the total heat exchange unit 31 is performed. Even if the parameter is included, the operator can accurately know which of the indoor unit 12 and the total heat exchange unit 31 is changing the flap control parameter.

By the way, the control parameter of the same item code may be assigned to the control of a plurality of different units. For example, the same item code “FF” is controlled for the setting function of “filter available time” in the

indoor units

11, 12, and 21 and the setting function of “presence / absence of 24-hour ventilation” in all the

heat exchange units

31 and 32. A parameter may be assigned.

The “filter usable time” is set for the dust removing filters in the

indoor units

11, 12, and 21, and corresponds to the time until the filter replacement or cleaning time. The

indoor units

11, 12, and 21 accumulate the respective operation times, and when the accumulated operation time exceeds a preset “filter usable time”, the display unit 53 of the remote controller 50 calls “filter”. Lights up the character pattern. “Ventilation for 24 hours” refers to an operation in which ventilation with a low air flow is continuously performed for the purpose of maintaining a clean state of indoor air. When this “24-hour ventilation” is set, the ventilation operation is continued without stopping even if the user performs an operation to stop the operation.

The control parameter of the item code “FF” assigned to the setting function of “filter usable time” includes, for example, three setting values “0001”, “0002”, and “0003” in addition to the item code “FF”. The set value “0001” is for setting 1000 hours as “filter usable time”. The set value “0002” is for setting 2000 hours as the “filter usable time”. The set value “0003” is for setting 3000 hours as the “filter usable time”. In this case, the upper limit value is “0003” and the lower limit value is “0001”. The remote controller 50 selectively sets these setting values “0001”, “0002”, and “0003” according to the pressing operation of the

time setting buttons

66 and 67.

The control parameter of the item code “FF” assigned to the setting function of “presence / absence of 24-hour ventilation” includes two setting values “0001” and “0002” in addition to the item code “FF”. The set value “0001” is for setting “24 hours ventilation”. The set value “0002” is for setting “no ventilation for 24 hours”. In this case, the upper limit value is “0002” and the lower limit value is “0001”. The remote controller 50 selectively sets the set values “0001” and “0002” according to the pressing operation of the

time setting buttons

66 and 67.

Thus, the same item code “FF” is set for the “filter usable time” setting function in the indoor units 21, 22, and 23 and the “24 hours ventilation presence / absence” setting function in all the

heat exchange units

31 and 32. If it is assigned to the control parameter, there is a possibility that an operator will make a setting error. For example, the operator intends to set the “filter usable time” included in the control parameters of all the

heat exchange units

31 and 32 to 1000 hours (= set value “0001”), but the

indoor units

11, 12, and 21 The “presence / absence of 24-hour ventilation” included in the control parameter may be set to “with 24-hour ventilation” (= setting value “0001”). The operator intends to set “24-hour ventilation is present” (= set value “0001”) as the “presence / absence of 24-hour ventilation” included in the control parameters of the

indoor units

11, 12, and 21. , 32 may be set to 1000 hours (= set value “0001”).

On the other hand, in the present embodiment, when the change target is the total heat exchange unit (ventilation unit) 31, 32, the character pattern 53e of “ventilation” is displayed in a blinking manner, so that the operator is attempting to change the setting. Can be accurately recognized at a glance whether it is the total

heat exchange unit

31, 32 or the

indoor unit

11, 12, 21. Therefore, the above setting mistake can be prevented.

In general, the units included in the air conditioning system are more indoor units than so-called ventilation units such as the total

heat exchange units

31 and 32. In consideration of this point, the character pattern “indoor unit” may be blinked when the change target is an indoor unit, and nothing may be displayed when the change target is a ventilation unit. Alternatively, the character pattern “indoor unit” may be displayed blinking when the change target is an indoor unit, and the character pattern 53e of “ventilation” may be displayed blinking when the change target is a ventilation unit.

As described above, according to this embodiment, the control parameters of the

indoor units

11, 12, 21 and all the

heat exchange units

31, 32, which are a plurality of types of units, can be appropriately changed without error. Even when a new type of unit is additionally connected, a measure parameter item code can be newly prepared or added by displaying on the remote controller 50 the identifiable type of the new unit. Is no longer necessary.

By the way, the remote controller 50 sequentially designates the group of each indoor unit and the group of each total heat exchange unit each time the ventilation button 71 is pressed. Then, the remote controller 50 sequentially designates each unit in the designated group one by one according to the pressing operation of the unit selection button 72. Therefore, if only the control parameters of all the

heat exchange units

31 and 32 need to be changed and the control parameters of the

indoor units

11, 12 and 21 need not be changed, the group of all the

heat exchange units

31 and 32 is designated from the beginning. As a result, the time required for the setting change can be shortened.

Further, the remote controller 50 sets the simultaneous change mode for the

indoor units

11, 12, and 21 when the swing button 69 is pressed while designating the indoor unit group. When the simultaneous change mode is set, the remote controller 50 changes the control parameters of the

indoor units

11, 12, and 21 simultaneously according to the pressing operation of the

temperature setting buttons

61 and 62 and the

time setting buttons

66 and 67. Similarly, when the remote controller 50 designates a group of all heat exchange units and the swing button 69 is pressed, the remote controller 50 sets a simultaneous change mode for all the

heat exchange units

31 and 32. When this simultaneous change mode is set, the remote controller 50 changes the control parameters of all the

heat exchange units

31 and 32 simultaneously according to the pressing operation of the

temperature setting buttons

61 and 62 and the

time setting buttons

66 and 67. When this simultaneous change mode is set, the remote controller 50 blinks the character pattern “ALL” using the unit number display pattern 53b of the display unit 53 as shown in FIG.

When all the control parameter changes are completed and the check button 65 is pressed, the remote controller 50 returns from the setting change mode to the normal mode under the determination that the operation is an end operation (YES in step 110). To do. At this time, the remote controller 50 ends the blinking display of each display pattern on the display unit 53 and returns the display unit 53 to the normal display.

In the above embodiment, the address and model of each unit are detected by initial communication. However, when requesting transmission of control parameters to the designated unit, the transmission of model information is also requested and returned together with the control parameters. It may be configured to detect the model of the unit based on the model information. Furthermore, although the case where the ventilation unit is a total heat exchange unit has been described as an example, the present invention can be similarly applied to a system having a ventilation unit without a total heat exchanger.

Further, the above embodiment is presented as an example, and is not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, rewrites, and changes can be made without departing from the scope of the invention. The scope of the invention is included in the gist of the embodiments and modifications, and is included in the invention described in the claims and the equivalent scope thereof.

The air conditioning system of the embodiment can be used for a unit having a plurality of types of units such as an indoor unit and a ventilation unit and a remote controller.

Claims

Multiple types of units for which control conditions are set,
A remote controller to manage these units,
A setting change processing means provided in the remote controller, selectively specifying each unit according to an operation of the remote controller, and changing a control condition of the specified unit according to an operation of the remote controller;
Display control means that is provided in the remote controller and displays the content of the control condition to be changed when the control condition is changed by the setting change processing means, and displays the type of the unit to be changed;
An air conditioning system comprising:
A detecting means provided in the remote controller for detecting the address and model of each unit;
The air conditioning system according to claim 1, further comprising:
The detection means detects the address and model of each unit by inquiring all the units at the same time upon power-on or reset and receiving a reply from each unit.
The air conditioning system according to claim 2.
The setting change processing means selectively designates each unit based on the address detected by the detecting means and according to the operation of the remote controller, and sets the control condition of the designated unit according to the operation of the remote controller. Change and return the changed control condition to the sending unit and update it.
The display control means displays the content of the control condition to be changed when the control condition is changed by the setting change processing means, and determines the type of unit to be changed based on the model detected by the detection means. indicate,
The air conditioning system according to claim 2.
The setting change processing means selectively designates each unit based on an address detected by the detecting means and according to an operation of the remote controller, and sets a control condition sent from the designated unit to the operation of the remote controller. Change the control conditions accordingly, and return the updated control conditions to the sending unit for update.
The display control unit displays the contents of the control condition to be changed when the control condition is changed by the setting change processing unit, and the type of the unit to be changed is sent together with the control condition from the designated unit Judgment and display based on information,
The air conditioning system according to claim 2.
The plurality of types of units each include a plurality of units.
The air conditioning system according to claim 1.
The setting change processing means includes means for selectively specifying each unit according to an operation of the remote controller, and specifies any one of the types of the units according to the operation of the remote controller. And means for selectively designating each unit of the designated group according to the operation of the remote controller, and changing the control conditions of the designated unit according to the operation of the remote controller.
The air conditioning system according to claim 6.
The air conditioning system according to claim 1, wherein the plurality of types of units are an indoor unit that performs cooling, dehumidification, heating, and the like, and a ventilation unit that ventilates the room.