5 CHECK THERMOSTAT OPERATION

NOTE

To prevent static discharge problems, touch side of thermostat to release static build-up before touching any keys.

If at any time during testing your system does not operate properly, contact a qualified serviceperson.

Heating System

1.Move SYSTEM switch to HEAT position. If the heating system has a standing pilot, be sure to light it.

2.Press to adjust thermostat setting above room tem- perature. The heating system should begin to operate.

3.Press to adjust temperature setting below room temperature. The heating system should stop operating.

Before you begin using your thermostat, you should be familiar with its features and with the display and the location and operation of the thermostat buttons. Your thermostat consists of two parts: the thermostat body and the base. To remove the body, gently pull it straight out from the base. To replace the body, line up the body with the base and press gently until the body snaps onto the base.

The Thermostat Buttons and Switches

1(Up arrow) Raises temperature setting.2(Down arrow) Lowers temperature setting.3SYSTEM switch (OFF, HEAT).

The Display

4 is displayed when the SYSTEM switch is in the HEAT position.5Displays current temperature.6“LO BATTERY” is displayed when the 2 “AAA” batteriesare low and should be replaced. Nothing else will be displayed.

7Displays currently set temperature (this is blank when SYSTEM switch is in the OFF position).

Operating Features

Now that you are familiar with the thermostat buttons and display, read the following information to learn about the many features of the thermostat.

•TEMPERATURE SETTING — Pressoruntil the display shows the temperature you want. The thermostat will keep the room temperature at the selected tempera- ture.

•°F/°C CONVERTIBILITY — The factory default setting is Fahrenheit. Clipping W904 jumper on the circuit board (see fig. 1) will alter this feature to Celsius temperature setting.

Figure 3. Thermostat display buttons and switches

•LOW BATTERY INDICATOR — If the 2 “AAA” alkaline batteries are low and should be replaced, the display will be blank except for “LO BATTERY”. When the batteries are low, pressing any button will cause the display to operate for ten seconds. After ten seconds, the display will be blank except for “LO BATTERY”. After “LO BATTERY” has been displayed for 4 weeks, thenthermostat will drop the tempera- ture 10° below your setpoint in HEAT mode. You cannot program with low batteries, but you can override setpoint temperature.

•TEMPERATURE DISPLAY ADJUSTMENT — Your new thermostat has been accurately set in our factory. How- ever, if you wish, you may adjust your new thermostat temperature display to match your old thermostat. This can be accomplished (within a ±3° range) as follows:

1.Press and at the same time for two seconds with the SYSTEM switch in OFF position.

2.Press or to adjust the displayed temperature to your desired setting.3.Move SYSTEM switch from OFF to exit the feature.

•DISPLAY BACKLIGHT— The display backlight improves display contrast in low lighting conditions. Selecting back- light ON will turn the light on for a short period of time after any button is pressed. Selecting backlight OFF (default) will keep the light off. Turn the display backlight feature ON as follows:

1.Press and at the same time for two seconds with the SYSTEM switch in HEAT position. The display will alternately show “-L”AND “FF” (off).

2.Press or to change “FF” to “ON”.3.Move SYSTEM switch to OFF to exit the feature.

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