DCN 141-01128-04 10/6/08
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Power
The TZ43 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 TZ43’s 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 TZ43’s RH terminal, and
wire the cooling systems 24VAC R to the TZ43’s RC terminal. Also wire the cooling systems 24VAC Com
to the TZ43’s 24VAC Com terminals.
Note: Do not split RC/RH for Heat Pump systems!
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