DCN: 141-01773-02 1/19/11
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INSTALLATION
Power
The thermostat requires 24VAC power from the HVAC system it is controlling. Connect the 24VAC
Common (typically the Blue wire/terminal) and 24VAC R (typically the Red wire/terminal) from the HVAC
system to the thermostats HVAC System terminal block 24VCom and 24V RH or 24V RC terminals (the
RH and RC terminals are default tied together)
Common or Split Transformer Systems
Most HVAC systems have a common heating and cooling transformer. A trace is connected to tie the RH
and RC inputs together for this configuration. If you have a system with separate heating and cooling
transformers, you will need to split the RH and RC jumper by cutting the trace on the PCB.
When wiring split systems, wire the heating systems 24VAC R (red wire) to the thermostat’s RH terminal,
and wire the cooling systems 24VAC R to the thermostat’s RC terminal. Also wire the cooling systems
24VAC Com to the thermostat’s 24VAC Com terminals.
Note: Do not split RC/RH for Heat Pump systems!
Remote Sensors
The TZ45 is compatible with Model RTS3 and RTS4 two wire remote sensors.
Refer to the wiring instructions included with the remote sensor.
NOTE: Remote Sensors require shielded twisted pair cable. Connect the shield to the 24VAC
Com connector on the wiring terminal strip.
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