DK142715B - Temperature lowering element for a thermostat. - Google Patents

Temperature lowering element for a thermostat. Download PDF

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Publication number
DK142715B
DK142715B DK119478A DK119478A DK142715B DK 142715 B DK142715 B DK 142715B DK 119478 A DK119478 A DK 119478A DK 119478 A DK119478 A DK 119478A DK 142715 B DK142715 B DK 142715B
Authority
DK
Denmark
Prior art keywords
thermostat
temperature
lowering element
housing
side walls
Prior art date
Application number
DK119478A
Other languages
Danish (da)
Other versions
DK119478A (en
DK142715C (en
Inventor
Jens Peter Koch
Original Assignee
Jens Peter Koch
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Jens Peter Koch filed Critical Jens Peter Koch
Priority to DK119478A priority Critical patent/DK142715B/en
Priority to DE19792909398 priority patent/DE2909398C2/en
Priority to FR7906273A priority patent/FR2420159A1/en
Priority to BE0/194034A priority patent/BE874861A/en
Priority to GB7909083A priority patent/GB2016690B/en
Publication of DK119478A publication Critical patent/DK119478A/da
Publication of DK142715B publication Critical patent/DK142715B/en
Application granted granted Critical
Publication of DK142715C publication Critical patent/DK142715C/da

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Classifications

    • GPHYSICS
    • G05CONTROLLING; REGULATING
    • G05DSYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D23/00Control of temperature
    • G05D23/19Control of temperature characterised by the use of electric means
    • G05D23/30Automatic controllers with an auxiliary heating device affecting the sensing element, e.g. for anticipating change of temperature

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Control Of Resistance Heating (AREA)
  • Thermally Actuated Switches (AREA)
  • Control Of Temperature (AREA)

Description

142715142715

Opfindelsen angår et temperatursænkningselement til en termostat, og som har mindst én elektrisk modstand til afgivelse af varme til termostaten, således at termostaten afføler en højere temperatur end omgivelsernes, hvilken modstand er båret 5 af en holder, som er beregnet til anbringelse under termostaten, hvilken holder har to overfor hinanden stående sidevægge, der er forbundet med hinanden ved hjælp af mindst én yderligere væg, som foroven er afsluttet med en kant, hvis form stort set svarer til omkredsformen af termostatens hus, og hvor den 10 elektriske modstand er monteret i holderen på et sted, der er omgivet af sidevæggene og den yderligere væg.BACKGROUND OF THE INVENTION 1. Field of the Invention The invention relates to a temperature lowering element for a thermostat having at least one electrical resistance for delivering heat to the thermostat such that the thermostat senses a higher temperature than the ambient, which resistance is carried by a holder intended for placement under the thermostat, which holder has two opposite side walls which are connected to each other by at least one additional wall, which is closed at the top with an edge, the shape of which corresponds substantially to the perimeter of the thermostat housing and where the electrical resistance is mounted in the holder in a place surrounded by the side walls and the additional wall.

Det er kendt at forsyne termostater, f.eks. termostater til termostatstyrede radiatorventiler, med elektriske modstande, som kan styres, f.eks. fra et tidsstyret anlæg. Når en termostat, 15 som er forsynet med en sådan elektrisk modstand, nemlig modtager varme fra modstanden, vil termostaten opfatte det, som om temperaturen i det rum, hvori termostaten er anbragt, er steget, og følgelig vil termostaten søge at sænke denne temperatur. Ved således at forsyne f.eks. termostatstyrede radiatorventiler 20 med sådanne modstande, er det muligt at få termostaterne til at foretage i det mindste en delvis lukning af de tilhørende radiatorer, således at man har mulighed for f.eks. i nattetimerne at regulere gennemstrømningen gennem radiatorerne, således at der i de af radiatorerne opvarmede rum indstilles en lavere 25 temperatur om natten end om dagen. Ved individuel styring af de enkelte termostatstyrede radiatorventiler er det også muligt at indstille forskellige nattetemperaturer i forskellige rum, elbr at opretholde dagtemperaturerne i visse rum.It is known to supply thermostats, e.g. thermostats for thermostatically controlled radiator valves, with controllable electrical resistors, e.g. from a time-controlled plant. When a thermostat provided with such an electrical resistor, namely, receives heat from the resistor, the thermostat will perceive it as if the temperature of the room in which the thermostat is located has increased, and consequently the thermostat will seek to lower that temperature. By thus supplying e.g. thermostatically controlled radiator valves 20 with such resistors, it is possible to cause the thermostats to at least partially close the associated radiators, so that it is possible, e.g. in the night hours, to regulate the flow through the radiators, so that in the rooms heated by the radiators a lower temperature is set at night than during the day. By individually controlling the individual thermostatically controlled radiator valves it is also possible to set different night temperatures in different rooms, or to maintain the day temperatures in certain rooms.

Hvad angår den kendte teknik, skal der henvises til beskri-30 velsen til USA patent nr. 3834618, hvorfra der kendes et tempe-ratursænkningselement af den indledningsvis angivne art. Dette kendte temperatursænkningselement er beregnet til at blive fastgjort på en væg under en termostat, og holderens to overfor hinanden stående sidevægge og disses forbindelsesvæg konverge-35 rer opefter, hvorved der dannes en smal udløbsåbning, hvorigennem luft, som er opvarmet af mødstanden, kan strømme ind i en ringformet åbning i termostatens hus for påvirkning af denne. Den af de konvergerende vægge dannede åbning forløber kun langs en 2 14271 δ omkredsvinkel på ca. 60° af termostaten.With respect to the prior art, reference is made to the specification of US Patent No. 3834618, from which a temperature-lowering element of the kind mentioned initially is known. This known temperature lowering element is intended to be fixed to a wall under a thermostat, and the two opposite side walls of the holder and their connecting wall converge upwardly, thereby forming a narrow outlet opening through which air heated by the contact stand can flow into an annular opening in the housing of the thermostat to influence it. The aperture formed by the converging walls extends only at a circumferential angle of approx. 60 ° of the thermostat.

Yderligere skal der, hvad angår den kendte teknik, henvises til beskrivelsen til USA patent nr. 3849753, hvorfra der kendes et temperstursænkningselement i form af et rør, der indeholder 5 modstanden. Dette rør er beregnet til ved hjælp af en snor at blive ophængt under en termostat, som er forsynet med en rille til optagelse af snoren. Et temperatursænkningselement af lignende art kendes fra beskrivelsen til USA patent nr, 4035752, hvor temperatursænkningselementet ligeledes er ophængt under 10 en termostat ved hjælp af en strop, således at et varmeelement i form af en lampe kan bestråle termostaten for opvarmning af denne udover den opvarmning, som termostaten får fra det rum, hvori den er anbragt.Further, with respect to the prior art, reference is made to the specification of United States Patent No. 3849753, from which a temperature-lowering element in the form of a pipe containing the resistance is known. This tube is intended to be suspended by means of a cord under a thermostat provided with a groove for receiving the cord. A temperature-lowering element of similar nature is known from the specification of U.S. Patent No. 4035752, wherein the temperature-lowering element is also suspended below a thermostat by means of a strap, so that a heating element in the form of a lamp can irradiate the thermostat for heating it in addition to the heating. which the thermostat receives from the room in which it is placed.

Temperatursænkningselementet ifølge den foreliggende opfin-15 delse er ejendommeligt ved, at sidevæggene består af elastisk materiale og foroven er forsynet med mod hinanden vendende fremspring, der er udformet til snapindgreb med to tilnærmelsesvis diametralt modstående ventilationsåbninger i termostatens hus. Herved opnås det, at temperatursænkningselementet bliver 20 let at montere, takket være snapindgrebet, og da sidevæggene . og dermed også den yderligere væg spænder over tilnærmelsesvis halvdelen af termostatens hus, opnås der en effektiv overføring af den af modstanden afgivne effekt til termostaten, således at den effekt, som den elektriske modstand skal afgive 25 for at opnå den fornødne påvirkning af termostaten, bliver lille.The temperature lowering element of the present invention is characterized in that the side walls are made of resilient material and are provided at the top with opposite projections, which are formed for snap engagement with two approximately diametrically opposed ventilation openings in the housing of the thermostat. Hereby it is achieved that the temperature-lowering element becomes easy to mount, thanks to the snap engagement and then the side walls. and thus also the additional wall spans approximately half of the housing of the thermostat, an effective transfer of the power delivered by the resistor to the thermostat is obtained, so that the power that the electrical resistance must emit to obtain the required influence of the thermostat is little.

Opfindelsen skal herefter forklares nærmere under henvisning til tegningen, hvor fig, 1 viser en udførelsesform for temperatursænknings- elementet, set forfra, og monteret på huset til en termostat til styring af en radiatorventil·, hvor termostathuset er vist med streg-prik-linier, fig. 2 temperatursænkningselementet ifølge fig, 1 set fra venstre, og hvor det tilhørende termostathus er vist 35 med fuldt optrukne linier, fig. 3 temperatursænkningselementet i fig. 1, vist for sig og set bagfra, fig. 4 elementet i fig. 3 set fraoven, men med visse dele udeladt, 3 142715 fig. 5 en monteringsplade til temperatursænkningselementet set fraoven og i forstørret målestok, fig. 6 monteringspladen i fig. 5 set forfra, og fig. 7 et koblingsdiagram til monteringspladen i 5 fig. 5 og 6.The invention will now be explained in more detail with reference to the drawing, in which Fig. 1 shows an embodiment of the temperature-lowering element, seen from the front, and mounted on the housing of a thermostat for controlling a radiator valve ·, in which the thermostat housing is shown with dash-dotted lines. FIG. Fig. 2 is a left side view of the temperature lowering element according to Fig. 1, and the associated thermostat housing is shown 35 with fully drawn lines; 3 shows the temperature lowering element of FIG. 1 is a rear view, fig. 4 shows the element of FIG. 3 seen from above, but with some parts omitted, fig. 5 is a top view of the mounting plate for the temperature-lowering element; FIG. 6 shows the mounting plate of FIG. 5 is a front view, and FIG. 7 is a circuit diagram of the mounting plate of FIG. 5 and 6.

På tegningen betegner 1 huset til en termostat, som styrer en radiatorventil. Dette hus har cylindrisk eller lidt bagud konisk udvidende form og er langs hele sin omkreds forsynet med ventilationsåbninger 2, således som vist i fig. 2. Disse venti-10 lationsåbninger tillader, at luft fra det rum, hvis temperatur skal styres, kan cirkulere gennem huset 1 og påvirke et deri anbragt udvidelseslegeme eller en føler, som på sin side påvirker den tilhørende radiatorventil således, at radiatorventilen påvirkes i retning til lukning, hvis temperaturen i det pågæl-15 dende rum skulle overskride en på forhånd indstillet temperatur, og således at radiatorventilen påvirkes til åbning, såfremt den pågældende temperatur skulle have tendens til at falde. Et sådant udvidelseslegeme eller føler er normalt udformet som en bælgformet beholder, der kan påvirke den tilhørende ventil. Bælgen 20 eller føleren kan ved hjælp af en ledning 3, scan antydet i fig. 2, være forbundet med en yderligere føler eller hjælpeføler, således som det er i og for sig kendt i forbindelse med termostatstyrede radiatorventiler. Normalt findes der i huset til en sådan termostat ca. tyve ventilationsåbninger 2, som er jævnt 25 fordelt langs hele omkredsen.In the drawing, 1 denotes the housing of a thermostat which controls a radiator valve. This housing has a cylindrical or slightly backward conical expanding shape and is provided along its entire circumference with ventilation openings 2, as shown in FIG. 2. These ventilation openings allow air from the room whose temperature is to be controlled to circulate through the housing 1 and actuate an expansion member or sensor located therein which in turn affects the associated radiator valve so that the radiator valve is affected in the direction. for closure if the temperature in the room in question should exceed a preset temperature and so that the radiator valve is actuated to open if the temperature in question tends to decrease. Such an extension body or sensor is usually designed as a bellows container which can actuate the associated valve. The bellows 20 or sensor can scan by means of a conduit 3, indicated in fig. 2 may be connected to a further sensor or auxiliary sensor, as is known per se in connection with thermostatically controlled radiator valves. Normally there is in the house for such a thermostat approx. twenty ventilation openings 2 which are evenly distributed along the entire circumference.

Den på tegningen viste udførelsesform for temperatursænkningselementet ifølge opfindelsen er som helhed betegnet med 4, og den består af en udvendigt på radiatorhuset 1 monterbar holder 5 med to overfor hinanden stående elastiske sidevægge 6 og 7, 30 jfr. fig. 3, samt en yderligere væg 8, der forbinder de to sidevægge med hinanden. Som det fremgår af fig. 3, er hver sidevæg foroven forsynet med et indadrettet fremspring, henholdsvis 9 og 10, til indgreb med hver sin af to tilnærmelsesvis diametralt overfor hinanden anbragte ventilationsåbninger 2. Takket 35 være sidevæggene 6 og 7's elasticitet kan fremspringene 9 og 10 indgribe med de tilhørende ventilationsåbninger 2 med snapvirkning, og af samme grund er fremspringene 9 og 10 forsynet med skråt mod hinanden vendende sidekanter, således at fremspringene 4 142715 tilspidser i retning mod hinanden. Oversiden af den yderligere væg 8 er udformet som en del af en cirkelbue 12, således at væggen 8, som det fremgår af fig. 1, i holderens monterede stilling slutter sig til ydersiden af huset 1.The embodiment of the temperature-lowering element according to the invention shown in the drawing is generally designated as 4, and it consists of an externally mountable bracket 5 with two mutually elastic side walls 6 and 7, 30, cf. FIG. 3, and an additional wall 8 connecting the two side walls with each other. As shown in FIG. 3, each side wall is provided at the top with an inwardly projecting projection 9 and 10 respectively for engagement with each of two ventilation openings arranged approximately two diametrically opposite each other. Thanks to the elasticity of the side walls 6 and 7, the projections 9 and 10 can engage the corresponding ventilation openings. 2 with snap action, and for the same reason, the projections 9 and 10 are provided with obliquely facing side edges, so that the projections 4 142715 point in a direction towards each other. The upper side of the additional wall 8 is formed as part of a circular arc 12, so that the wall 8, as shown in FIG. 1, in the mounted position of the holder, joins the outside of the housing 1.

5 Sidevæggene 6 og 7 og forvæggen 12 er støbt i ét stykke af formstof, hvorved sidevæggene 6 og 7 får den tilstrækkelige elasticitet til, at fremspringene 9 og 10 kan indgribe med åbningerne 2 med snapvirkning.5 The side walls 6 and 7 and the front wall 12 are molded in one piece of plastic material, whereby the side walls 6 and 7 have the sufficient elasticity for the projections 9 and 10 to engage with the openings 2 with snap action.

Som det fremgår af fig. 4, har fremspringene 9 og 10 skrå 10 endeflader 14 og 15, som i holderens monterede stilling får an læg mod bagkanterne af åbningerne 2 i huset 1, således at holderens stilling i forhold til dette er sikkert fastlagt i holderens monterede stilling.As shown in FIG. 4, the projections 9 and 10 have oblique 10 end faces 14 and 15 which, in the mounted position of the holder, abut against the trailing edges of the openings 2 in the housing 1, so that the position of the holder relative thereto is securely fixed in the mounted position of the holder.

Forneden i holderen er der som vist i fig. 3 monteret en 15 monteringsplade 15, idet dennes endekanter indgriber i spor 17 og 18, som er udformet i sidevæggene 6 og 71 s mod hinanden vendende sider og ved disses nederste ender. På denne monteringsplade er der monteret to elektriske modstande R·^ og R2, hvoraf modstanden R1 befinder sig forrest i fig. 3 og følgelig skjuler 20 den bag ved liggende modstand R2. Monteringspladen 16 er, således som det fremgår af fig. 5, forsynet med ledende belægninger, således at de to modstande R^ og R2 er koblet til tre tilslutninger 20, 21 og 22, således som det fremgår af koblingsdiagrammet i fig. 7. Ved den på tegningen viste udførelsesform har 25 modstanden R^ en størrelse af 1000 ohm og modstanden R2 en størrelse af 1500 ohm. Følgelig vil det forstås, at hvis der påtrykkes en spænding på 24 volt over tilslutningerne 20 og 21, altså over modstanden R^, vil der blive afgivet en effekt på ca.At the bottom of the holder, as shown in FIG. 3, a mounting plate 15 is mounted, the end edges thereof engaging in grooves 17 and 18 formed in the side walls 6 and 71 s facing each other and at their lower ends. Two electrical resistors R1 and R2 are mounted on this mounting plate, the resistor R1 being in the front of FIG. 3 and, consequently, 20 conceals the underlying resistor R2. The mounting plate 16 is as shown in FIG. 5, provided with conductive coatings such that the two resistors R1 and R2 are coupled to three terminals 20, 21 and 22, as shown in the wiring diagram of FIG. 7. In the embodiment shown in the drawing, the resistor R1 has a size of 1000 ohms and the resistor R2 is a size of 1500 ohms. Accordingly, it will be appreciated that if a voltage of 24 volts is applied across terminals 20 and 21, i.e. over resistor R 2, an output of approx.

0,5 w; hvis spændingen påtrykkes over tilslutningerne 20 og 22, 30 vil effekten, som afgives af modstanden R2, blive ca. 0,4 W, og endelig vil 24 volt over de to tilslutninger 21 og 22 give en afgivende effekt fra de to modstande R^ og R2 koblet i serie på ca. 0,2 W.0.5 w; if the voltage is applied across terminals 20 and 22, 30, the power delivered by resistor R2 will be approx. 0.4 W, and finally, 24 volts across the two terminals 21 and 22 will give a discharge power from the two resistors R 1 and R 2 connected in series of approx. 0.2 W.

Som de fremgår af fig. 3, er modstanden R^ anbragt på mon-35 teringspladen 16 i en sådan højde over denne, at modstanden be finder sig meget nær ved den cirkelbueformede overkant 12 af forvæggen 8. Dette er ensbetydende med, at modstandene i den i 5 142715 fig. 1 og 2 viste monterede stilling af holderen befinder sig umiddelbart under huset 1 og ud for åbningerne 2, således som antydet i fig. 2, hvor de to modstande R^ og R2 er antydet med punkterede linier. I monteringspladen 16 findes der under 5 de to modstande og R2 en gennemstrømningsåbning 24, således at der er rigelig luftadgang nedefra gennem monteringspladen 16, nemlig gennem hullet 24, op forbi modstandene og ind i de åbninger 2 i huset 1, som strækker sig langs overkanten af forvæggen 8. Sidevæggene 6 og 7 kombineret med forvæggen 8 vil 10 med andre ord tjene som en luftføringskanal for luft, som strømmer nedefra og opefter gennem termostathuset 1, og når den ene, den anden eller begge modstandene opvarmes, overføres denne varme derved på effektiv måde til termostatens inde i huset 1 anbragte føler. Derved kommer føleren til at føle en anden 15 temperatur end den, der hersker i det rum, hvori den pågældende termostat er anbragt. Ved forsøg har det således vist sig, at de i det foregående omtalte effekter på henholdsvis 0,6; 0,4 og 0,2 W vil medføre, at termostaten føler en temperatur, som er henholdsvis 6°C, 4°C og 2°C højere end den temperatur, der 20 hersker i det pågældende rum. Dette vil med andre ord sige, at termostaten vil forsøge at sænke temperaturen i det pågældende rum med henholdsvis 2, 4 og 6°, alt efter hvorledes modstandene er koblet, når temperatursænkningselementet forsynes med strøm.As shown in FIG. 3, the resistor R1 is placed on the mounting plate 16 at a height above it that the resistor is very close to the circular arcuate upper edge 12 of the front wall 8. This means that the resistors in the embodiment shown in FIG. 1 and 2, the mounted position of the holder is immediately below the housing 1 and next to the openings 2, as indicated in FIG. 2, where the two resistors R1 and R2 are indicated by dashed lines. In the mounting plate 16, there are below 5 the two resistors and R2 a flow opening 24, so that there is ample air access from below through the mounting plate 16, namely through the hole 24, up past the resistors and into the openings 2 in the housing 1 extending along the upper edge. In other words, the side walls 6 and 7 combined with the wall 8 will serve as an air duct for air flowing down and up through the thermostat housing 1 and when one, the other or both resistors are heated, this heat is thereby transferred to the effective way of sensing the thermostat located inside the housing 1. In this way, the sensor will feel a temperature different from that prevailing in the room in which the thermostat in question is located. Thus, in experiments it has been found that the effects mentioned above of 0.6 respectively; 0.4 and 0.2 W will cause the thermostat to feel a temperature which is 6 ° C, 4 ° C and 2 ° C respectively higher than the temperature prevailing in that room. In other words, this means that the thermostat will try to lower the temperature in the room in question by 2, 4 and 6 ° respectively, depending on how the resistors are coupled when the temperature lowering element is supplied with power.

DK119478A 1978-03-16 1978-03-16 Temperature lowering element for a thermostat. DK142715B (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
DK119478A DK142715B (en) 1978-03-16 1978-03-16 Temperature lowering element for a thermostat.
DE19792909398 DE2909398C2 (en) 1978-03-16 1979-03-09 Temperature reduction device for use with an existing thermostat
FR7906273A FR2420159A1 (en) 1978-03-16 1979-03-12 DEVICE FOR LOWERING THE TEMPERATURE OF A THERMOSTAT
BE0/194034A BE874861A (en) 1978-03-16 1979-03-15 DEVICE FOR LOWERING THE TEMPERATURE OF A THERMOSTAT.
GB7909083A GB2016690B (en) 1978-03-16 1979-03-15 Temperature setback devices for thermostats

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DK119478A DK142715B (en) 1978-03-16 1978-03-16 Temperature lowering element for a thermostat.
DK119478 1978-03-16

Publications (3)

Publication Number Publication Date
DK119478A DK119478A (en) 1979-09-17
DK142715B true DK142715B (en) 1980-12-29
DK142715C DK142715C (en) 1981-08-10

Family

ID=8102029

Family Applications (1)

Application Number Title Priority Date Filing Date
DK119478A DK142715B (en) 1978-03-16 1978-03-16 Temperature lowering element for a thermostat.

Country Status (5)

Country Link
BE (1) BE874861A (en)
DE (1) DE2909398C2 (en)
DK (1) DK142715B (en)
FR (1) FR2420159A1 (en)
GB (1) GB2016690B (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3100276A1 (en) * 1981-01-08 1982-10-14 Manfred 7250 Leonberg Luik THERMOSTAT FOR ACTUATING A CONTROL UNIT
FR2498743A1 (en) * 1981-01-29 1982-07-30 Reynier Bernard Electrically operated domestic central heating controller - uses electric heating element near thermostatic regulator valve associated with radiator to lower operating temp.
DE3114811C2 (en) * 1981-04-11 1983-03-17 Harald 4130 Moers Heuser Electric setpoint adjustment device for thermostatic control valves
DE3214177C1 (en) * 1982-04-17 1983-07-07 Walter Dipl.-Ing. 7030 Böblingen Rich Device for the time-dependent adjustment of the thermostat control valve of a hot-water space heater
DE4115799A1 (en) * 1991-05-11 1992-11-12 Manfred Dr Ing Riedel THERMOSTAT VALVE
DE10065098B4 (en) * 2000-12-28 2004-01-22 F.W. Oventrop Gmbh & Co. Kg Adjustment device for valves

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2253511A1 (en) * 1972-10-28 1974-05-16 Vaillant Joh Kg ARRANGEMENT FOR INDEPENDENT REGULATING THE TEMPERATURE OF A ROOM
US3849753A (en) * 1973-06-07 1974-11-19 Capital Enterprises Inc Heater attachment device for a wall-mounted thermostat
SE387757B (en) * 1974-12-19 1976-09-13 F Utzon RADIATOR THERMOSTAT DEVICE

Also Published As

Publication number Publication date
GB2016690A (en) 1979-09-26
BE874861A (en) 1979-07-02
FR2420159B1 (en) 1983-04-15
GB2016690B (en) 1982-09-22
FR2420159A1 (en) 1979-10-12
DE2909398A1 (en) 1979-09-27
DK119478A (en) 1979-09-17
DE2909398C2 (en) 1982-03-04
DK142715C (en) 1981-08-10

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