Cooling Cycle —
When operating in the cooling cycle,
your dual fuel heat pump will run until the indoor tempera-
ture is lowered to the level you have selected. On extremely
hot days, your dual fuel heat pump will run for longer pe-
riods at a time and have shorter ‘‘off’’ periods than on mod-
erate days.
The following are typical conditions that add extra heat
and/or humidity to your home. Your heat pump will work
longer to keep your home comfortable under these
conditions:
• 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 switch of your in-
door thermostat set to the HEAT position, the dual fuel heat
pump will operate in its heating mode until room tempera-
ture is raised to the level you have selected. Of course, the
heating unit will have to operate for longer periods to main-
tain a comfortable environment on colder days and nights
than on moderate ones.
DEFROST CYCLE — When your dual fuel heat pump is
providing heat to your home and the outdoor temperature
drops below 45 degrees Fahrenheit, moisture may begin to
freeze on the surface of the outdoor coil. If allowed to build
up, this ice would impede airflow across the coil and reduce
the amount of heat absorbed from the outside air. So, to main-
tain energy-efficient operation, your dual fuel heat pump has
an automatic defrost cycle.
Depending on which model you have, the defrost cycle starts
at a preset time interval of 30, 50, or 90 minutes. However,
it may be reset. Defrost will start at the preset time only if
the ice is sufficient to interfere with normal heating
operation.
After the ice is melted from the outdoor coil, or after a maxi-
mum of 10 minutes in the Defrost mode, the unit will au-
tomatically switch back to normal heating operation.
Do not be alarmed if steam or fog appears at the outdoor
unit during the defrost cycle. Water vapor from the melting
ice may condense into a mist in the cold outside air.
EMERGENCY HEAT — The EMERGENCY HEAT setting
on your thermostat refers to supplementary gas heating that
is included in your home comfort system. Operation of the
EMERGENCY HEAT source may be required if the heat
pump malfunctions.
The red light on your thermostat will glow if the
SYSTEM switch is moved from HEAT to the EMER-
GENCY HEAT setting. This indicates that the heat pump is
off and the supplemental gas heating is selected for
operation.
Also, your particular model of heat pump may include a
Service Sentry™ circuit, which is used with a thermostat that
includes a red warning light. The red warning light will glow
if the compressor malfunctions. Call your dealer for imme-
diate service if you suspect trouble.
TO LIGHT UNIT
Your dual fuel heat pump is equipped with an automatic
direct spark ignition and power combustion blower.
Do not attempt to light by hand; personal injury may
result.
1. Do not turn off the electrical power to unit without
first turning off the gas supply.
2. Before attempting to start the gas heating section, fa-
miliarize yourself with all the procedures that must
be followed.
If you do not follow these instructions exactly, a fire or
explosion may result, causing property damage, injury,
or loss of life.
Refer to Fig. 2. See Fig. 3 for location of gas valve. Refer
to Fig. 4 while proceeding with the following steps.
Step 1 —
Set the temperature selector on room thermo-
stat to the lowest temperature setting and set SYSTEM switch
to EM HEAT.
Step 2 —
Close the external manual shutoff valve.
Step 3 —
Turn off the electrical supply to the unit.
Step 4 —
Remove the burner access panel with a
5
⁄
16
-in.
nut driver.
Step 5 —
Turn the control dial on the internal gas valve
counterclockwise
to the OFF position and wait
5 minutes.
Step 6 —
Turn the control dial on the internal gas valve
clockwise
to the ON position.
Step 7 —
Replace the burner access panel.
Step 8 —
Turn on the electrical supply to unit.
Step 9 —
Open the external manual shutoff valve.
Fig. 1 — Typical Thermostat
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