Remotec ZTS-110 Z-Thermostat User Manual page 9

Important!
If you will be powering the ZTS‐110 with 24Vac:
Connect the "24Vac Common" (typically the black wire/terminal) and "24Vac Power" (typically
the Red wire/terminal) from the HVAC system to the ZTS‐110 HVAC System terminal block "C"
and "RH" or "RC" terminals (see the following explanation, these may be jumpered together).
Common or Split Transformer Systems:
Most HVAC systems have a common heating and cooling transformer. You must insert a jumper
wire to tie the RH and RC inputs together for this configuration. If you have a system with
separate heating and cooling transformers, do not insert a jumper wire between RC and RH.
When wiring split systems, wire the heating systems "24Vac Power" (red wire) to the ZTS‐110
"RH" terminal, and wire the cooling systems "24Vac Power" to the ZTS‐110 "RC" terminal. Also
wire the cooling systems "24Vac Common" to the ZTS‐110 "C" terminals.
Note: Do not split RC/RH for Heat Pump systems!
ZTS-110
O
B
W2
W1
G
Y
RC
RH
C
Figure 4. Non‐heat pump (Standard Gas or Electric) HVAC system wiring
ZTS-110
O
B
W2
W1
G
Y
RC
RH
C
Brown
White
Green
Yellow
Red
Black
Orange
Blue
Brown
Green
Yellow
Red
Black
Figure 5. Heat pump system wiring
9
Standard HVAC System
nd
W2 – 2 stage heater
st
W1 – 1 stage heater
G - Fan
Y - Compressor
R - 24Vac Power
C - 24Vac Common
Heat Pump HVAC System
O - Cool changeover (heat pump)
B - Heat changeover (heat pump)
nd
W2 – 2 stage heater
G - Fan
Y - Compressor
R - 24Vac Power
C - 24Vac Common