MODEL 8870 THERMOSTAT SPECIFICATIONS:
Control Voltage 24V AC
±
20%
Switched Voltage 18 – 30V AC
Maximum Operating Current 2.0A total at rated voltage, through all outputs.
1.0A through any one output.
Maximum Surge Current 2.0A
Control Accuracy
±
1.0°F
Control Range 40° – 90°F
Operating Range 32° – 99°F
1. HVAC SYSTEM PRE-INSTALLATION CHECK LIST
Before getting started determine what type of heating system is/will be installed in the house.
Then use Table 1 to determine if the proper numbers of wires are available depending on the
HVAC System. Additional wires will be required for communication system.
TABLE 1
APPLICATION # OF HVAC WIRES DIAGRAM PAGE #
Single Stage Furnace & AC 5 1 16
Two Stage Furnace & Two Stage AC 7 2 17
Roof Top Unit (Two Stage Heat & Two Stage Cool) 7 3 18
Boiler with AC (Two Transformers) 5 4 19
Single Stage Heat Pump 7 5 20
Two Stage Heat Pump 9 6 21
First Stage Radiant Floor Heat
Second Stage Furnace One Stage of Cooling 6 7 22
2
