
9
Important!
IfyouwillbepoweringtheZTS‐110with24Vac:
Connectthe“24VacCommon”
(typicallytheblackwire/terminal)and“24VacPower”(typically
theRedwire/terminal)fromtheHVACsystemtotheZTS‐110HVACSystemterminalblock“C”
and“RH”or“RC”terminals(seethefollowingexplanation,thesemaybejumperedtogether).
CommonorSplitTransformerSystems:
MostHVACsystemshaveacommonheatingandcoolingtransformer.Youmustinserta jumper
wiretotietheRHandRCinputstogetherforthisconfiguration.Ifyouhaveasystemwith
separateheatingand
coolingtransformers,donotinsertajumperwirebetweenRCandRH.
Whenwiringsplitsystems,wiretheheatingsystems“24VacPower”
(redwire)totheZTS‐110
“RH”terminal,andwirethecoolingsystems“24VacPower”totheZTS‐110“RC”terminal.Also
wirethecoolingsystems“24VacCommon”
totheZTS‐110“C”terminals.
Note:DonotsplitRC/RHforHeatPumpsystems!
Figure4.Non‐heatpump(StandardGasorElectric)HVACsystemwiring
Figure5.HeatpumpHVACsystemwiring
O
B
W2
W1
G
Y
RC
RH
C
C - 24Vac Common
R - 24Vac Power
Y - Compressor
G - Fan
W1 – 1
st
stage heater
W2 – 2
nd
stage heater
Black
Red
Yellow
Green
White
Brown
Standard HVAC System
O
B
W2
W1
G
Y
RC
RH
C
C - 24Vac Common
R - 24Vac Power
Y - Compressor
G - Fan
W2 – 2
nd
stage heater
Black
Red
Yellow
Green
Brown
O - Cool changeover (heat pump)
Heat Pump HVAC System
ZTS-110
B - Heat changeover (heat pump)
Blue
Orange
ZTS-110
J2
J2
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