Table 3
Default Program Settings (Time & Temp.)
Programs | Time | Temp. − Heat | Temp. Cool |
|
|
|
|
All days − A | 6:00am | 70_F / 21°C | 78_F / 26°C |
|
|
|
|
All days − B | 8:00am | 62_F / 17°C | 85_F / 29°C |
|
|
|
|
All days − C | 6:00pm | 70_F / 21°C | 78_F / 26°C |
|
|
|
|
All days − D | 10:00pm | 62_F / 17°C | 82_F / 28°C |
|
|
|
|
Thermostat Output Table
Table 4 depicts the 51M38 thermostat output states for var- ious input conditions.
Table 4
Thermostat Outputs
Condition | W1 | Y1 | G |
|
|
|
|
Gas Heat, Auto Fan
Heat Demand | X |
|
|
|
|
|
|
Cool Demand |
| X | X |
|
|
|
|
No Demand |
|
|
|
|
|
|
|
Gas Heat, Continuous Fan |
|
|
|
|
|
| |
Heat Demand | X |
| X |
|
|
|
|
Cool Demand |
| X | X |
|
|
|
|
No Demand |
|
| X |
|
|
|
|
Electric Heat, Auto Fan |
|
|
|
|
|
| |
Heat Demand | X |
| X |
|
|
|
|
Cool Demand |
| X | X |
|
|
|
|
No Demand |
|
|
|
|
|
|
|
Electric Heat, Continuous Fan |
| ||
|
|
| |
Heat Demand | X |
| X |
|
|
|
|
Cool Demand |
| X | X |
|
|
|
|
No Demand |
|
| X |
|
|
|
|
NOTE − X = output is activated with 24VAC.
Technical Specifications
Thermostat Type
Electronic programmable thermostat for
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 17)
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 17).
| Changing Fahrenheit/Celsius Setting |
1 |
|
2 |
|
3 |
|
4 |
|
5 |
|
6 | PLUG IN (Use Care To Avoid Bending Prongs.) |
7 |
|
| F/C (Fahrenheit/Celsius) switch |
| shown in Celsius position |
Figure 17
Indoor 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.
Outdoor Temperature Measurement Range
Measurement Scale: Fahrenheit
Measurement Range: −22°F to 122°F
Measurement Resolution: 1°F
Measurement Accuracy: +/−2°F
Temperature Setpoint Range
Setting range: 50°F (10°C) to 90°F (32°C)
Setting resolution: 1°F (1°C)
Page 7
51M38 SERIES 5/2
