Chapter 11 General wiring information
82 CNT-SVX12C-EN
HVAC unit electrical circuit wiring
The terminals labeled Rc and Rh are provided as inputs for 24 Vac power
from the transformer(s) of the HVAC system.
Packaged units
If the HVAC unit combines heating and cooling (referred to as a “pack-
aged” unit), it will typically have one “R” transformer. For 24 Vac wiring
of packaged units, the Rc terminal must be wired as shown in this
procedure:
1. Locate the jumper at J1 on the controller circuit board (Figure 28 on
page 83). Place the jumper on both pins at J1 on the circuit board
(Figure 29 on page 83).
2. Wire the Rc terminal to the transformer on the unit (Figure 30 on
page 84).
Split systems
If the unit is a split system (a unit with physically separate heating and
cooling sections), there is typically a separate transformer for each func-
tion. For 24 Vac wiring of split systems, the Rc and Rh terminals must be
wired as show in this procedure:
1. Locate the jumper at J1 on the controller circuit board (Figure 28 on
page 83). Remove the jumper from the pins at J1 on the circuit board
(Figure 29 on page 83).
2. Replace the jumper on one of the pins at J1 for possible future use.
3. Wire Rc to the transformer for the cooling section of the unit
(Figure 31 on page 84).
4. Wire Rh to the transformer for the heating section of the unit
(Figure 31 on page 84).
Note:
The Tracer ZN517 is shipped from the factory with terminals
Rc and Rh coupled with the jumper at J1 on the controller cir-
cuit board.
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