Performing Routine Maintenance, Cooling Cycle, Heating Cycle

or MODE control. Thermostats may vary from those shown in Fig. 2 and 3.

The temperature control selector can be a dial, lever, or set of buttons that allows you to establish the temperature that you wish to maintain for your personal comfort. Some thermostats possess two temperature control selectors: one for setting the temperature desired during the cooling cycle, and one to set the heat- ing operation temperature.

The FAN control offers two options for controlling the indoor blower;AUTO and ON. When set to AUTO, the blower will run only while the thermostat operates the cooling or heating section. When the FAN control is set to ON, the blower will run continuously—regardless of whether the cooling or heating section is operating.

MAIN

OFF

Fig. 4—Main Electrical Disconnect

Typically, the SYSTEM or MODE con- trol on your thermostat offers the follow- ing selections; COOL, OFF, AUTO and HEAT. Neither the cooling nor heating section will operate when the SYSTEM or MODE control is set to OFF. With the SYSTEM or MODE control set to COOL, the cooling section of your com- fort system will operate when the indoor temperature rises above the level that you wish to maintain. With the SYSTEM or MODE control set to HEAT, the heating section will operate automatically when the indoor temperature falls below the level that you have selected.

The AUTO selection found on some thermostats provides for automatic changeover between cooling and heating cycles. With the SYSTEM or MODE control set to AUTO, the cooling section will operate when the indoor temperature rises above the thermostat cooling temperature setting, or the heating section will operate when the indoor temperature drops below the thermostat setting for the heating cycle.

Your thermostat may be PROGRAM- MABLE or NON-PROGRAMMABLE. A NON-PROGRAMMABLE thermo- stat does not allow the temperature set- tings to be varied throughout the day or week without physically changing the settings. A PROGRAMMABLE thermo- stat allows various daily temperature changes to be preset. During the winter for example, you may wish to set back the temperature of your home at night, then have the temperature return to normal prior to waking up. The home’s tempera- ture can then be lowered again during the day when no one is at home, but again be at peak comfort level when your family returns home. During the summer, the opposite changes might be programmed.

When properly used, the programming can result in energy savings on your home’s heating and cooling.

NOTE: Your 2-speed air conditioning system has several special features built in to protect the unit.

•5-MINUTE TIME DELAY—Unit will delay operation upon initial start- up or short-cycling of the indoor thermostat.

•1-MINUTE TIME DELAY—When changing speeds from low to high, or high to low, there is a 1-minute time delay. During the speed change delay, the outdoor fan will continue to run.

•2-MINUTE LOW-SPEED MINI- MUM—If the unit has not operated within the past 30 minutes, upon the next cooling demand, it will operate for a minimum of 2 minutes on low speed.

If you wish to program your accessory electronic indoor thermostat, refer to thermostat Installation Instructions.

COOLING CYCLE

When operating in the cooling cycle, your air conditioner will run until the indoor temperature is lowered to the level you have selected. On extremely hot days, your air conditioner will run for longer periods at a time and have shorter off periods than on moderate days. Your 2-speed air conditioner spends about 80% of its time operating in low speed. This means that it will operate for longer periods of time than a single-speed air conditioner even on moderate days. This longer operational time in low speed results in higher efﬁciency operation, lower operating noise, and better humid- ity control than a single-speed air con- ditioner could achieve.

The following conditions typically add extra heat and/or humidity to your home and make your cooling unit work longer to keep your home comfortable:

•Entrance doors are frequently opened and closed.

•Laundry appliances are being operated.

•A shower is running.

•More than the usual number of people are present in the home.

•More than the normal number of electric lights are in use.

•Drapes are open on the sunny side of the home.

HEATING CYCLE

With the SYSTEM or MODE control of your indoor thermostat set to HEAT, the heating section of your home comfort system will operate until room temper- ature is raised to the level you have se- lected. Of course, the heating unit will have to operate for longer periods to main- tain a comfortable environment on cooler days and nights than on moderate ones.

Refer to your furnace Owner's Manual for speciﬁc information on heating operation.