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Installer setup (ISU) (continued)
ISU Setup Number and Description
430 = Minimum Cool Setpoint
431 = Maximum Heat Setpoint
1400 = Backlighting
1401 = Backlight Brightness
1420 = Temperature Display Offset
NOTE: Once you have cycled through all of the System Setup numbers, press
Done to save and exit to the home screen.
Setup Complete
You have now finished installing and setting up your thermostat.
Specifications
Temperature Setpoint Ranges
Heat: 32 °F to 90 °F (0 °C to 32.0 °C)
Cool: 50 °F to 99 °F (10.0 °C to 37.0 °C)
Operating Ambient Temperature
32 °F to 102 °F (0 °C to 38.9 °C)
Shipping Temperature
-20 °F to 120 °F (-28.9 °C to 48.9 °C)
Electrical Ratings
Terminal
W Heating
W2 (Aux) Heating (PSTSN21AWH only)
E Emergency Heat (PSTSN21AWH only)
Y Compressor Stage 1
G Fan
O/B Changeover
Options (factory default in bold)
50 °F to 99 °F (50 °F)
10.0 °C to 37.0 °C (10.0 °C)
Note: The cool temperature cannot be set below this
level.
32 °F to 90 °F (90 °F)
0 °C to 32.0 °C (32 °C)
Note: The heat temperature cannot be set above this
level.
0 = On Demand
1 = Continuous
Note: Common wire needed for continuous.
1 - 5
Note: Only displayed if continuous backlight
selected.
-3 °F to 3 °F (0 °F)
-1.5 °C to 1.5 °C (0 °C)
Note: 0 °F = No difference in displayed temperature
and the actual room temperature. The thermostat
can display up to 3 °F (1.5 °C) lower or higher than
the actual measured temperature.
Operating Relative Humidity
5% to 90% (non-condensing)
Physical Dimensions in inches (mm)
(H x W x D)
3.86" H x 5.19" W x 1.08" D
98.24 mm H x 132 mm W x 27.5 mm D
Voltage (50/60Hz)
20-30 Vac
20-30 Vac
20-30 Vac
20-30 Vac
20-30 Vac
20-30 Vac
9
Running Current
0.02-1.0 A
0.02-1.0 A
0.02-0.5 A
0.02-1.0 A
0.02-0.5 A
0.02-0.5 A
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