User Guide

ViewStat Installation and Wiring
22
ViewStat Communicating Thermostat
Connecting the ViewStat to the HVAC System
1. Make sure the HVAC system power is off.
2. The following figures (FIG. 14, FIG. 15) show wiring diagrams for several different HVAC
equipment types. Use these diagrams as a reference only. Use color coding where possible.
a. FIG. 14 shows a typical heat/cool wiring schematic:
Communication and Equipment Terminal Wiring Definitions (Cont.)
Equipment Terminal (Cont.)
DEH/Y1 1st stage Cooling (non-heat pump)
-or-
1st stage Compressor (heat pump)
-or-
Dehumidification (with humidity control sensor)
W2 2nd stage Heat (non-heat pump)
-or-
2nd stage Emergency Heat (heat pump)
Y2 2nd stage Cooling (non-heat pump)
-or-
2nd stage Compressor (heat pump)
A qualified HVAC technician should perform these steps step to ensure proper
termination.