To connect a five-wire system (C, W, G, RC, RH, Y) to the
thermostat:
1. Remove the orange jumper wire.
2. Connect the Y wire to the Y terminal on the thermostat. This
connects the cooler compressor.
3. Connect the RH wire to the RH terminal on the thermostat.
This connects the heater power.
4. Connect the RC wire to the RC terminal on the thermostat.
This connects the cooling power.
5. Connect the W wire to the W terminal on the thermostat. This
connects the heater control line.
6. Connect the G wire to the G terminal on the thermostat. This
connects the fan.
Your system is now connected to the thermostat.
Figure 7: Five-wire connections
C
RC
Thermostat
RH
W
Y
G
Cool power
Heat power
Heat
Cool
comp
Fan
HVAC system
RC
RH
W
Y
G
Remove
jumper
wire
C
Batteries
The IS-ZW-TSTAT-100 requires three AA Alkaline batteries.
Batteries are used for backup in case of power loss. We do not
recommend the batteries as the primary source of power.
To install the batteries:
1. Press the Heat/Cool Mode button to Off and press the Fan
button to Auto.
2. Remove the bottom cover section to access the battery
compartment.
3. Install three AA Alkaline batteries according to the polarity
noted in the battery compartment. (Do not use rechargeable
batteries.)
4. Replace the bottom cover.
Replace the batteries when the red Low Battery LED indicator
blinks or once a year.
Caution:
The thermostat will go “off” if the batteries die. This could
expose your house to unexpected heat or cold.
Testing
Follow these procedures to verify you have correctly installed the
thermostat (see Figure 1 on page 1).
To check the fan (if you connected the G wire-fan relay):
1. Press the Fan button to On.
2. Verify that air is blowing from the system.
3. Return the Fan button to the Auto selection for normal
operation.
To check heat mode:
1. Press the Heat/Cool Mode button to Heat.
2. Press the + button to raise the target temperature to 90
°
F.
Allow the system 2 minutes to respond.
3. Verify that heat is blowing from the system.
4. Return the Heat/Cool Mode button to Off.
Leave off for 4 minutes before checking the cool mode.
To check cool mode:
Note:
Do not operate AC if the outside temperature is below 65
°
F.
1. Press the Heat/Cool Mode button to Cool.
2. Press the blue (-) button to lower the cool target temperature
to 50
°
F.
Allow the system 5 minutes to respond.
3. Verify that cool air is blowing from the system.
4. Return the Heat/Cool Mode button to Off.
If you have electric heat, locate the Gas/Elec switch. Move the
selector jumper to the Elec position (see Figure 1 on page 1).
Calibration
The IS-ZW-TSTAT-100 thermostat comes from the factory
calibrated to
±
1
°
of actual temperature. If you want the
thermostat to display the same temperature as another
thermostat in the home, you can adjust its calibration.
To change the calibration:
1. Remove the top cover section.
2. Locate the Calibration switch and slide it to the On position.
The current calibration factor is (
±
) of the IS-ZW-TSTAT-100
will appear in the LCD display.
3. Push the Up or Down arrows until the desired calibration
factor is reached.
4. Slide the Calibration switch to the Off position. The new
calibrated temperature will be displayed on the LCD.
5. Replace the top cover section.
Reset
The Reset button (located under the top cover) defaults all
programming to target temperatures (heat 70
°
F, cool 75
°
F).
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P/N 1069534 • REV A • ISS 17MAR10
