Lennox International Inc LENNOX Elite Series XP13 Units HEAT PUMPS Thermostat Operation

Thermostat Operation

See the thermostat homeowner manual for instructions on how to operate your thermostat.

Heat Pump Operation

Your new Lennox heat pump has several characteristics that you should be aware of:

SHeat pumps satisfy heating demand by delivering large amounts of warm air into the living space. This is quite different from gas- or oil-fired furnaces or an electric furnace which deliver lower volumes of considerably hotter air to heat the space.

SDo not be alarmed if you notice frost on the outdoor coil in the winter months. Frost develops on the outdoor

coil during the heating cycle when temperatures are below 45°F (7°C). The heat pump control activates a defrost cycle lasting 5 to 15 minutes at preset intervals to clear the outdoor coil of the frost.

SDuring the defrost cycle, you may notice steam rising from the outdoor unit. This is a normal occurrence. The thermostat may engage auxiliary heat during the defrost cycle to satisfy a heating demand; however, the unit will return to normal operation at the conclusion of the defrost cycle.

Extended Power Outage

The heat pump is equipped with a compressor crankcase heater which protects the compressor from refrigerant slugging during cold weather operation.

If power to your unit has been interrupted for several hours or more, set the room thermostat selector to the EMERGENCY HEAT setting to obtain temporary heat without the risk of serious damage to the heat pump.

In EMERGENCY HEAT mode, all heating demand is satisfied by auxiliary heat; heat pump operation is locked out. After a six-hour compressor crankcase warm-up period, the thermostat can be switched to the HEAT setting and normal heat pump operation may resume.

Preservice Check

If your system fails to operate, check the following before calling for service:

SVerify room thermostat settings are correct.

SVerify that all electrical disconnect switches are ON.

SCheck for any blown fuses or tripped circuit breakers.

SVerify unit access panels are in place.

SVerify air filter is clean.

SIf service is needed, locate and write down the unit model number and have it handy before calling.

Accessories

For update−to−date information, see any of the following publications:

SLennox XP13 Engineering Handbook

SLennox Product Catalog

SLennox Price Book

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XP13 SERIES