Remotec ZTS-100 User Manual page 7

Important!
The ZTS-100 can be powered by alkaline batteries AA x 4pcs or 24Vac.
Connect the "24VAC Common" (typically the Blue wire/terminal) and "24VAC Return" (typically
the Red wire/terminal) from the HVAC system to the ZTS-100 HVAC System terminal block "C"
and "RH" or "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 wire 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 disconnect the RH and RC wire.
When wiring split systems, wire the heating systems "24VAC Return" (red wire) to the ZTS-100
"RH" terminal, and wire the cooling systems "24VAC Return" to the ZTS-100 "RC" terminal. Also
wire the cooling systems "24VAC Common" to the ZTS-100 "C" terminals.
Note: Do not split RC/RH for Heat Pump systems!
ZTS-100
O
B
W2
W1
G
Y
RC
RH
C
Figure 2. Non-heat pump (Standard Gas or Electric) HVAC system wiring
O
B
W2
W1
G
Y
RC
RH
C
Orange
White
Green
Yellow
Red
Blue
Orange
Green
Yellow
Red
Blue
Figure 3. Heat pump system wiring
7
Standard HVAC System
nd
W2 – 2 stage heater
st
W1 – 1 stage heater
G - Fan
Y - Compressor
R - 24VAC Return
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 Return
C - 24VAC Common