Jan 12, 2005 12:48
19 yrs ago
3 viewers *
English term
thermostat off
English
Tech/Engineering
Mechanics / Mech Engineering
remote control system for an air conditioning plant (series of indoor units connected to some outdoor units)
The original English text may be incorrect as it is not written by a mothertongue and it is full of mistakes.
here are some sentences (not in sequence) where this expression appears:
"In order to increase continuous operation of the unit in low latent heat applications and avoid the rise
of temperature after thermostat OFF, the thermostat control will be changed when using field settings
....
To prevent the compressor from frequently turning ON and OFF and allow pressure equalization,
forced thermostat OFF will be conducted for 3 minutes after compressor stopping (compressor guard
timer).
Thermostat off due to freeze-up prevention
Thermostat off due to high outdoor temperature.
The thermostat control prevents the thermostat from turning OFF in the following conditions:
- Initial operation for the first 2.5 minutes, or
- Defrosting, or
- Forced operating mode
...I thought a thermostat would always stay ON, while it could turn ON/OFF the units based on the temperature reading, but here the thermostat appears to actually switch off.... or am I wrong?
The original English text may be incorrect as it is not written by a mothertongue and it is full of mistakes.
here are some sentences (not in sequence) where this expression appears:
"In order to increase continuous operation of the unit in low latent heat applications and avoid the rise
of temperature after thermostat OFF, the thermostat control will be changed when using field settings
....
To prevent the compressor from frequently turning ON and OFF and allow pressure equalization,
forced thermostat OFF will be conducted for 3 minutes after compressor stopping (compressor guard
timer).
Thermostat off due to freeze-up prevention
Thermostat off due to high outdoor temperature.
The thermostat control prevents the thermostat from turning OFF in the following conditions:
- Initial operation for the first 2.5 minutes, or
- Defrosting, or
- Forced operating mode
...I thought a thermostat would always stay ON, while it could turn ON/OFF the units based on the temperature reading, but here the thermostat appears to actually switch off.... or am I wrong?
Responses
1 hr
Selected
switch
A thermostat is merely a switch and surely does trun on and off - based on a set of rules- whatever it has to turn on or off, be it a compressor, a damper actuator, whatever
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Note added at 1 hr 4 mins (2005-01-12 13:52:23 GMT)
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We also have humidistats, aquastats, and so on, all of them are swtiches that operate in certain conditions and response to certain variables like temperature, humidity, water level ,....
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Note added at 2 hrs 8 mins (2005-01-12 14:56:57 GMT)
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Ever noticed the floater mechanism in the toilet flush? that\'s a switch too, if the water lever in the tank is low, the floater shall open the (Turn ON)stream and allow water into the tank, when it reaches a certain predefined level, it stops (Turns OFF) the water flow.
A thermostat operates based on a very similar concept.
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Note added at 1 hr 4 mins (2005-01-12 13:52:23 GMT)
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We also have humidistats, aquastats, and so on, all of them are swtiches that operate in certain conditions and response to certain variables like temperature, humidity, water level ,....
--------------------------------------------------
Note added at 2 hrs 8 mins (2005-01-12 14:56:57 GMT)
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Ever noticed the floater mechanism in the toilet flush? that\'s a switch too, if the water lever in the tank is low, the floater shall open the (Turn ON)stream and allow water into the tank, when it reaches a certain predefined level, it stops (Turns OFF) the water flow.
A thermostat operates based on a very similar concept.
4 KudoZ points awarded for this answer.
Comment: "many thanks, thanks alos to Alaa, I would like to split points between you too but it's not possible"
+2
10 mins
thermostat off...
:) ...means it does not activate the compressor (turning on the system and changing the temperature)
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Note added at 12 mins (2005-01-12 13:00:01 GMT)
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Nothing technically wrong in the text
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Note added at 12 mins (2005-01-12 13:00:01 GMT)
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Nothing technically wrong in the text
13 mins
>>>>
OFF – position when the thermostat does not work
ON – the devise works
ON – the devise works
37 mins
how the thermostat is turned off
The thermostat is turned off by one of two mechanisms:
- The heat sensor (or old-fashioned metalic coil) detects the temperature falling below the required temperature. A circuit is opened and the compressor is switched off.
- Programmed or manual override forcing the thermostat into the above condition, either permanently or temporarily.
The above text list the conditions under which the second mechanisms overrides the heat sensing mechanism to force the thermostat into the OFF state, or to prevent the OFF state from kicking in.
Hope this helps
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Note added at 44 mins (2005-01-12 13:32:06 GMT)
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Temperature sensor is a little more accurate than heat sensor in the above explanation.
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Note added at 1 hr 30 mins (2005-01-12 14:18:03 GMT)
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In answer to your follow up question:
You think the text uses thermostat OFF in two ways, either the thermostat switches off normally, or the thermostate is disabled. I do not think that is the case. I believe that the word simply means that the thermostat (the switch as Maya and Rahi indicated) is put in the OFF position, by any means, for example:
1. Surrounding temperature sensing
2. Timed, as during initialization of the system, or for several minutes following (1.) to prevent thrashing back and forth, etc.
3. Forced, as in the case of high outside temperature, probably to prevent continuous operation
I believe that you interpreting into the text two different modes: ON/OFF and enable/disable. You may be right, but I do not think so. I lean to read the OFF in this text as the OFF position throughout the text, but I could be wrong too!
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Note added at 1 hr 33 mins (2005-01-12 14:21:17 GMT)
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I said (as Maya and Rahi indicated). Actually Maya describes a \"diable\'\" action, so I should only say (as Rahi indicated).
- The heat sensor (or old-fashioned metalic coil) detects the temperature falling below the required temperature. A circuit is opened and the compressor is switched off.
- Programmed or manual override forcing the thermostat into the above condition, either permanently or temporarily.
The above text list the conditions under which the second mechanisms overrides the heat sensing mechanism to force the thermostat into the OFF state, or to prevent the OFF state from kicking in.
Hope this helps
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Note added at 44 mins (2005-01-12 13:32:06 GMT)
--------------------------------------------------
Temperature sensor is a little more accurate than heat sensor in the above explanation.
--------------------------------------------------
Note added at 1 hr 30 mins (2005-01-12 14:18:03 GMT)
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In answer to your follow up question:
You think the text uses thermostat OFF in two ways, either the thermostat switches off normally, or the thermostate is disabled. I do not think that is the case. I believe that the word simply means that the thermostat (the switch as Maya and Rahi indicated) is put in the OFF position, by any means, for example:
1. Surrounding temperature sensing
2. Timed, as during initialization of the system, or for several minutes following (1.) to prevent thrashing back and forth, etc.
3. Forced, as in the case of high outside temperature, probably to prevent continuous operation
I believe that you interpreting into the text two different modes: ON/OFF and enable/disable. You may be right, but I do not think so. I lean to read the OFF in this text as the OFF position throughout the text, but I could be wrong too!
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Note added at 1 hr 33 mins (2005-01-12 14:21:17 GMT)
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I said (as Maya and Rahi indicated). Actually Maya describes a \"diable\'\" action, so I should only say (as Rahi indicated).
1 day 20 hrs
thermostat is switched off from the control circuit.
thermostat is switched off from the control circuit.
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