GE Security IS-ZW-TSTAT-100, Installation Sheet

Wiring 

Note: 

For wiring questions, call the thermostat hotline at 888-819-

4135. 

The table below describes the terminals on the IS-ZW-TSTAT-100 
Basic Thermostat.  

 
C 

24 volt common 

W 

First stage heat relay 

Y 

First stage cool relay 

RH Power 

for 

heat 

RC Power 

for 

heat 

G Fan 

relay 

The wire translation chart for the IS-ZW-TSTAT-100 is provided 
below: 

 
C, X 

> 

C 

W, H 

> 

W 

Y, C, M 

> 

Y 

R, V, 4, RH 

> 

RH 

RC >  RC 

G, F 

> 

G 

Tip:

 For Trane systems with a B wire, the B wire is typically the C 

wire. If you have conventional heat and you have a B wire, the B 
goes to C.  

Tip:

 If your system is a heat pump with both an O and B wire, the 

IS-ZW-TSTAT-100 Basic Thermostat will not control your system. 
Consider the IS-ZW-TSTAT-300 Advanced Thermostat as an 
alternative. 

The following sections describe different HVAC wiring systems.  

To connect a two-wire system (C, W, RH, or R) to the 
thermostat: 

1.  Connect the R (or RH) wire to the RH terminal on the 

thermostat. This connects the heater power. 

2.  Connect the W wire to the W terminal on the thermostat. This 

connects the heater control line. 

Your system is now connected to the thermostat. 

Figure 4: Two-wire connections 

C

RC

Thermostat

RH

W

Y

G

Heat power

Heat

HVAC system

W

jumper
wire

C

R

To connect a three-wire system (C, W, RH or R, G) to the 
thermostat: 

1.  Connect the R (or RH) wire to the RH terminal on the 

thermostat. This connects the heater power. 

2.  Connect the W wire to the W terminal on the thermostat. This 

connects the heater control line. 

3.  Connect the G wire to the G terminal on the thermostat. This 

connects the fan. 

Your system is now connected to the thermostat. 

Figure 5: Three-wire connections 

C

RC

Thermostat

RH

W

Y

G

Heat power

Heat

Fan

HVAC system

W

G

jumper
wire

C

RC

To connect a four-wire system (C, W, G, R or RH, Y) to the 
thermostat: 

1.  Connect the Y wire to the Y terminal on the thermostat. This 

connects the cooler compressor. 

2.  Connect the R (or RH) wire to the RH terminal on the 

thermostat. This connects the heater/cooler power. 

3.  Connect the W wire to the W terminal on the thermostat. This 

connects the heater control line. 

4.  Connect the G wire to the G terminal on the thermostat. This 

connects the fan. 

Your system is now connected to the thermostat. 

Figure 6: Four-wire connections 

C

RC

Thermostat

RH

W

Y

G

Heat power

Heat

Cool
comp

Fan

HVAC system

W

Y

G

jumper
wire

C

RC

P/N 1069534 • REV A • ISS 17MAR10 

3 of 6