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Non-Programmable Thermostats
10 Jan / 19
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How do I switch between Fahrenheit and Celsius on my thermostat?

dcahill    DMH110 Non-programmable Thermostat
If you wish to change the temperature displayed to Read Celsius instead of Fahrenheit, (or Fahrenheit to Celsius): Take the front cover of the stat off the wall.  Look on the circuit board to find the jumper table which tells you what the jumpers are for. Look for the Row...
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10 Jan / 19
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How do I set the calibration on my thermostat?

dcahill    DMH110 Non-programmable Thermostat
If you wish to adjust the displayed temperature up or down, there is calibration feature in your thermostat.  Although it is factory calibrated and should not need to be changed, you can adjust it to match a different thermometer in home.  To adjust calibration, perform the following: Turn temperature mode...
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10 Jan / 19
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What is swing, and how do I set it?

dcahill    Programmable Thermostat TX9100E
A thermostat works by turning your heating or cooling system on and off whenever the room temperature varies a certain number of degrees from the set-point.  This variation is the “swing”. Your system should cycle on about 3 to 6 times per hour. There is only one swing setting for...
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10 Jan / 19
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How do I adjust the temperature differential for 2nd stage heating?

dcahill    Programmable Thermostat TX9100E
The OFFSET setting is shown as  number of degrees (default = 4F). It is similar in nature to the Swing setting, however,  it only effects the operation of the second (auxiliary) heating stage of heat pumps.  The auxiliary heat is there for when your system can’t keep up with your...
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How do I program the schedule on my thermostat?

Programmable Thermostat TX9100E
There are four periods per each day, for Heat mode and Cool mode.  They are: MORN, DAY, EVE, NITE.  ALL 4 periods MUST be set for the thermostat to function properly.  These same programming steps for all four periods, must be performed independently for both Heat and Cool programs. TO...
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How do I lock and unlock my thermostat?

Programmable Thermostat TX9100E
To prevent tampering with your settings, the front panel keys and the rotary dial can be locked out, requiring a four digit code to unlock them. You may use either the default lock code of “0000”, or your own code number (see “To Change The Lock Code”). The button presses...
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10 Jan / 19
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How do I adjust calibration on my thermostat?

dcahill    Programmable Thermostat TX9100E
If you wish to adjust the displayed temperature up or down, there is calibration feature in your thermostat.  Although it is factory calibrated and should not need to be changed, you can adjust it to match a different thermometer in home. To adjust your Calibration, perform the following steps: Ensure...
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9 Jan / 19
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How do I program the schedule on my thermostat?

dcahill    Programmable Thermostat TX1500E
There are four periods per each grouping of days, for Heat mode and Cool mode.  They are: MORN, DAY, EVE, NITE.  ALL 4 periods MUST be set for the thermostat to function properly.  Select either HEAT or COOL with the Temperature mode switch.  These same programming steps for all four...
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9 Jan / 19
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What is swing, and how do I set it?

dcahill    Programmable Thermostat PSP511 PSP511LC TX1500E TX500E
A thermostat works by turning your heating or cooling system on and off whenever the room temperature varies a certain number of degrees from the set-point.  This variation is the “swing”. Your system should cycle on about 3 to 6 times per hour. A smaller swing setting increases the number...
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9 Jan / 19
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How do I program the schedule on my thermostat?

dcahill    ELV4 Programmable Thermostat PSP511 PSP511LC TX500E WIN100
(similar procedure for all 5/2-day programmable models with a Rotary Dial)   There are four periods per each grouping of days, for Heat mode and Cool mode.  They are: MORN, DAY, EVE, NITE.  ALL 4 periods MUST be set for the thermostat to function properly.  Select either HEAT or COOL...
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9 Jan / 19
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How do I set a hold?

dcahill    ELV4 Programmable Thermostat PSP511 PSP511LC TX1500E TX500E TX9100E WIN100
Use the HOLD feature on the thermostat to allow manual control. This bypasses all the programs and provides a constant temperature permanently until you manually take it out of the HOLD mode again. ​ Thermostat must be in either heat or cool position. Dial must be in Run position. Press...
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9 Jan / 19
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How do I reset my thermostat?

dcahill    Programmable Thermostat PSP511 PSP511LC TX1500E TX500E TX9100E
If your thermostat is behaving erratically or something strange is in the display, hitting “Reset” buttons can often correct the problem. Hardware Reset: Try this first since it does not erase anything.  Take the front of the thermostat off the wall and look for a small black round reset buttons...
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