PRO TH4110D Programmable Thermostat
5
Typical 1H/1C system: 1 transformer Typical 1H/1C system: 2 transformers
1 Power supply. Provide disconnect means and overload protection as required.
2 Factory-installed jumper. Remove for 2-transformer systems only.
3 Use either O or B terminals for changeover valve.
4 Use a small piece of wire (not supplied) to connect W and Y terminals.
5 Set fan operation switch to Heat Pump (see page 6) and configure for heat pump (see pg. 8).
6 Optional 24 VAC common connection.
Wiring diagrams
Typical 1H/1C heat pump system Typical heat-only system
Typical heat-only system with fan Typical cool-only system
Remove jumper
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