Lennox Elite Series XP13 Units Installation Instructions Manual page 25

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.
THERMOSTAT OPERATION
Though your thermostat may vary somewhat from the
description below, its operation will be similar.
Temperature Setting Levers
Most heat pump thermostats have two temperature
selector levers: one for heating and one for cooling. Set the
levers or dials to the desired temperature setpoints for both
heating and cooling. Avoid frequent temperature
adjustment; turning the unit off and back on before
pressures equalize puts stress on the unit compressor.
Fan Switch
In AUTO or INT (intermittent) mode, the blower operates
only when the thermostat calls for heating or cooling. This
mode is generally preferred when humidity control is a
priority. The ON or CONT mode provides continuous
indoor blower operation, regardless of whether the
compressor or auxiliary heat are operating. This mode is
required when constant air circulation or filtering is desired.
System Switch
Set the system switch for heating, cooling or auto
operation. The auto mode allows the heat pump to
automatically switch from heating mode to cooling mode to
maintain predetermined comfort settings. Many heat
pump thermostats are also equipped with an emergency
heat mode which locks out heat pump operation and
provides temporary heat supplied by the auxiliary heat.
Indicating Light
Most heat pump thermostats have an amber light which
indicates when the heat pump is operating in the
emergency heat mode.
Temperature Indicator
The temperature indicator displays the actual room
temperature.
Programmable Thermostats
Your Lennox
programmable thermostat. These thermostats provide the
added feature of programmable time-of-day setpoints for
both heating and cooling. Refer to the user's information
manual provided with your particular thermostat for
operation details.
Preservice Check
If your system fails to operate, check the following before
calling for service:
S
Check to see that all electrical disconnect switches are
ON.
S
Make sure the room thermostat temperature selector
is properly set.
S
Make sure the room thermostat system switch is
properly set.
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Replace any blown fuses, or reset circuit breakers.
S
Make sure unit access panels are in place.
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Make sure air filter is clean.
S
Identify the unit model number before calling.
OPTIONAL ACCESSORIES
Refer to the Engineering Handbook for optional
accessories that may apply to this unit. The following may
or may not apply:
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Compressor crankcase heater
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Mounting bases
S
Timed off control
S
Stand−off kit
S
Sound cover
S
Low ambient kit
S
Monitor kit
S
SignatureStatt room thermostat
S
Loss of charge kit
S
High pressure switch kit
S
Mild weather kit
S
Compressor monitor
Page 25
system may be controlled by a
XP13 SERIES