cycles.WiththeSYSTEMswitchsetintheAUTOposition,
thecoolingmodeisactivatedwhentheindoortemperature
risesabovethethermostatcoolingtemperaturesetting,or
the heatingmodewill be activatedwhenthe indoor
temperaturedropsbelowthe thermostatsettingforthe
heatingcycle.
Dependingonyourwinterheatingneeds,yourdualfuel
unitincludessupplementarygasheating.Yoursystemwill
turnonthegasheatto meetyourheatingneedswhen
outdoortemperaturesareverylowor whenheatingis
neededwhiletheheatpumpsystemgoesthroughadefrost
cycle.Intheeventofaheatpumpsystemmalfunction,you
canusetheEmergencyHeatsettingonyourthermostatto
deactivatethe heatpumpsystemandactivatethe gas
heatingsystem. If it becomesnecessaryto usethe
EmergencyHeatsetting,callyourdealerforserviceas
soonasitispractical.
Yourdualfuelunitallowsyoutoadjustthebalancepoint
temperature.Thebalancepointtemperatureistheoutdoor
temperaturewheregasheatisusedinsteadofheatpump
heat. Referto the installationinstructionsfor proper
balancepointselection.
See your thermostatowner's manualfor additional
information.
SEQUENCE OF OPERATION
Cooling Mode:
(1)On a call for cooling
The compressor, condenser fan, and evaporator blower
motor will energize.
The air conditioner has 2 stages of cooling, and will
automatically pick the correct cooling stage based on the
difference between the actual temperature and the set
point temperature on the thermostat. For maximum
efficiency, avoid frequent changes to the set point
temperature.
(2)When the cooling setpoint has been satisfied
The compressor and condenser fan will de-energize
immediately. Evaporator blower motor will have a delay
off of 90 seconds.
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.
The following are typical conditions that add extra heat
and/or humidity to your home. Your air conditioner 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 Mode:
Depending on the outdoor temperature, the indoor
temperature, and the set point temperature on the
thermostat, the dual fuel unit will choose among 3 different
heating modes to operate. The heating modes are as
follows:
(1) First stage heat pump mode
If the outdoor temperature is above the balance point
temperature (programmed into the thermostat by
homeowner or installer) and the difference between the
actual indoor temperature and desired indoor
temperature is small, the dual fuel unit will run in 1st stage
heat pump mode.
(2) Second stage heat pump mode
If the outdoor temperature is above the balance point
temperature and the difference between the actual
indoor temperature and desired indoor temperature is
larger, the dual fuel unit will run in 2nd stage heat pump
mode.
(3) Gas heat mode
There are 4 cases where gas heat is used:
1. If the outdoor temperature is below the balance point
temperature (programmed into the thermostat by
homeowner or installer) and heat is needed to raise the
indoor temperature.
2.If the outdoor temperature is above the balance point
temperature and the difference between the actual
indoor temperature and desired indoor temperature
becomes very large, the dual fuel unit will turn off the
heat pump and turn on the gas heat.
3. Ifthe heat pump mode is not operational, the dual fuel
unit can be put into Emergency Heat mode on the
thermostat. Emergency Heat mode will run gas heat for
all heating requirements until the heat pump system
can be repaired.
4. If the heat pump system requires a defrost cycle to
clear frost from the outdoor coil, the system will turn on
the gas heat.
Note: The dual fuel unit can NEVER operate in heat pump
mode and gas heat mode at the same time.
Note: To set the balance point temperature on the
thermostat, refer to the installation instructions to
determine the best balance point temperature to use.
Defrost Cycle - When your 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
maintain energy-efficient operation, your heat pump has
an automatic defrost cycle.
The defrost cycle starts at a preset time interval of 30, 60,
90 or 120 minutes. Defrost will start atthe 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
maximum of 10 minutes in the Defrost mode, the unit will
automatically 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.
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