Lennox 14HPX-018 Installation Instructions Manual page 24

unit will return to normal operation at the conclusion of
the defrost cycle.
IN CASE OF EXTENDED POWER OUTAGE...
The heat pump may be equipped with a compressor crank-
case heater which protects the compressor from refriger-
ant "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 "Emer-
gency 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 nor-
mal heat pump operation may resume.
Though your thermostat may vary somewhat from the de-
scription below, its operation will be similar,
TEMPERATURE SETTING LEVERS
Most heat pump thermostats have two temperature selec-
tor levers: one for heating and one for cooling. Set the lev-
ers or dials to the desired temperature setpoints for both
heating and cooling. Avoid frequent temperature adjust-
ment; 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 in-
door blower operation, regardless of whether the com-
pressor or auxiliary heat are operating. This mode is re-
quired when constant air circulation or filtering is desired.
SYSTEM SWITCH
Set the system switch for heating, cooling or auto opera-
tion. The auto mode allows the heat pump to automatically
switch from heating mode to cooling mode to maintain pre-
determined comfort settings. Many heat pump thermo-
stats are also equipped with an emergency heat mode
which locks out heat pump operation and provides tempo-
rary heat supplied by the auxiliary heat.
INDICATING LIGHT
Most heat pump thermostats have an amber light which in-
dicates when the heat pump is operating in the emergency
heat mode.
TEMPERATURE INDICATOR
Temperature indicator displays actual room temperature.
PROGRAMMABLE THERMOSTATS
Your Lennox system may be controlled by a program-
mable thermostat. These thermostats provide the added
feature of programmable time-of-day setpoints for both
heating and cooling. Refer to the user's information manu-
al provided with your thermostat for operation details.
PRESERVlCE CHECK
If your system fails to operate, check the following before
calling for service:
• Make sure all electrical disconnect switches are ON,
• Make sure the room thermostat temperature selector
AND the system switch are properly set.
• Replace any blown fuses, or reset circuit breakers.
• Make sure unit access panels are in place.
• Make sure air filter is clean.
• Locate and record unit model number before calling,
Job Name
Job Location
Installer
Unit Model No.
Nameplate Voltage
Rated Load Ampacity
Maximum Fuse or Circuit Breaker
Electrical Connections Tight?
Serial No.
Job no. Date
City State
City State
Service Technician
Compressor
Indoor Filter clean? _1
Indoor Blower RPM __ S.P. Drop Over Indoor (Dry)
Discharge Pressure Vapor Pressure
Refrigerant Lines: - Leak Checked? _ Properly Insulated?
Service Valves: --- Fully Opened? _ Caps Tight?
Voltage With Compressor Operating
Outdoor Fan
Supply Voltage (Unit Off)
Outdoor Coil Entering Air Temp.
Refrigerant Charge Checked?
_ Checked?
Thermostat
_] Properly Set? _]
Level? _]
505243 04/08
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