Technical Specifications
Thermostat Type
Electronic programmable thermostat for 2−Stage (gas or electric)
Power Supply Range
18VAC − 30VAC (24VAC nominal), 60Hz
CAUTION
24VAC is present on the terminals of the thermostat bracket. If removing the thermostat from the wall, use caution and avoid touching any of the connec- tor terminals on the wall bracket.
Also, when working with the thermostat dip switches, use a non−conductive tool and take cau- tion to avoid making any contact with the circuit board, its imprinted circuitry and its connector prongs.
Temperature Display
Display Scale: Fahrenheit or Celsius user selectable (via DIP switch; see figure 18)
Display range: 35°F (2°C) to 99°F (37°C)
Display resolution: 1°F (1°C)
Display Accuracy: +/−1°F
If the Fahrenheit/Celsius display must be changed, use a plastic, non−conductive tool to push the dip switch to the right position (see figure 18).
| Changing Fahrenheit/Celsius Setting |
1 |
|
2 |
|
3 |
|
4 |
|
5 |
|
6 | PLUG IN (Use Care To Avoid Bending Prongs.) |
| F/C (Fahrenheit/Celsius) switch |
| shown in Celsius position |
Figure 18
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)
Smart Setback Recovery (via DIP switch #6)
Smart Setback Recovery (SSR) affects the way the ther- mostat responds to program events. If SSR is disabled, the thermostat will react to a program event at the time the event occurs. However, if SSR is enabled, the thermostat will react to a program event before the event occurs such that the desired temperature is reached at the time of the event, not after.
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.
Table 4
51M35 Terminal Designations
Terminal | Description |
R24VAC
Y1 | |
|
|
W1 | |
|
|
Y2 | |
|
|
W2 |
GFan control
LService Indicator
C24VAC common
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 activa- tion 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.
Equipment Protection Override
Both the minimum compressor OFF timer and the mini- mum equipment cycle timer can be over−ridden by press- ing and holding either the HEAT or COOL button down for 4 seconds.
Over−Temperature Protection
Filter Reminder
Settings of Off, 1, 3, 6 or 12 (months of fan run time) are available. When programmed time has elapsed, a FILTER indicator is displayed.
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