Service Indicator
When abnormal equipment operation is detected, the SERVICE indicator will flash on the
Service Indicator Flashing
ROOM 73 SERVICE
FAN
AUTO
SYSTEM
HEAT
Figure 13
Thermostat RESET
Under some abnormal conditions, it may be desirable to at to its default condition. This can be
useful on rare occasions when the the thermostat is behav- ing abnormally (e.g. after an electrical storm or power out- age). The RESET button can be used to recover from this situation.
The RESET button is an unlabeled, recessed button lo- cated behind the door on the right−hand side of the thermo- stat, just below the SETTINGS button. The RESET button is visible in figure 3. Use a paper clip or small pencil to press the RESET button. After the RESET button is pressed, the thermostat settings will return to the defaults listed in the Default Settings section.
Default Thermostat Settings
Default thermostat settings are in table 1.
Table 1
Default Thermostat Settings
Mode | Heat |
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Setpoint | 70°F (or 21°C) |
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Fan | Auto |
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Filter Reminder | OFF (reminder setting = 0) |
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Equipment Protection | reset back to zero |
Timers |
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|
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Technical Specifications
Thermostat Type
Electronic nonprogrammable thermostat for 1H/1C, gas or electric heat, non−heat pump, non−power robbing applica- tions.
Power Supply Range
18VAC − 30VAC (24VAC nominal), 60Hz
Temperature Display
Display Scale: Fahrenheit or Celsius user selectable (via DIP switches)
Display range: 35°F (2°C) to 99°F (37°C)
Display resolution: 1°F (1°C)
Display Accuracy: +/−1°F
Temperature Measurement Range
Measurement Scale: Fahrenheit
Measurement Range: 35°F to 99°F
Measurement Resolution: 0.5°F
Measurement Accuracy: +/−1°F
Field Offset: via DIP switches to +/−3°F
Sampling Method: temperature measurements sampled every 15 seconds. Displayed temperature is the average of the last four measurements.
Temperature Setpoint Range
Setting range: 50°F (10°C) to 90°F (32°C)
Setting resolution: 1°F (1°C)
Fan Control
AUTO or ON modes, gas or electric heat compatible via DIP switches (also see Thermostat Output section).
I/O Relays
All thermostat relays are latching type to minimize power consumption.
1.HEAT/COOL relay output
2.FAN relay output
3.SERVICE relay input
Equipment Protection Timers
Minimum Compressor OFF time: 5 minutes
Minimum Compressor ON time: 4 minutes
Minimum Furnace ON time: 3 minutes
Minimum furnace cycle time (elapsed time between any furnace activation and the next furnace activation): 6 min- utes.
Minimum elapsed time between any compressor activation and the next compressor activation: 6 minutes.
NOTE − All protection timers (except the compressor OFF timer) can be over−ridden if a heating or cooling demand is initiated or terminated using the UP, DOWN, HEAT, or COOL buttons.
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