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Installer's Guide
IMPORTANT: Upon completion of wiring, check all electrical
connections, including factory wiring within the unit. Make sure
all connections are tight. Replace and secure all electrical box
covers and access doors before leaving the unit or turning on the
power to the unit.
NOTE: The outdoor sensor should be located in an area which
will provide a representative outdoor ambient temperature
reading.
Step 5—Unit Startup
Pre-Start Quick Checklist
Is the unit properly located and level with the proper
●
clearance? See Figures 1-6, pages 4-9.
Is the duct work correctly sized, run, taped, insulated, and
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weatherproofed with proper unit arrangement? See Ductwork
Installation section on page 16.
Is the gas piping correctly sized, run, trapped, and purged of
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air? See Gas Piping section on page 17.
Is the condensate line properly sized, run, trapped, and
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pitched? See Condensate drain section on page 16.
Is the filter of the correct size and number? Is it clean and in
●
place? See Air Filter section on page 19.
Is the wiring properly sized and run according to the unit wiring
●
diagram?
Are all the wiring connections, including those in the unit,
●
tight?
Has the unit been properly grounded and fused with the
●
recommended fuse size?
Is the thermostat correctly wired and well located?
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Is the W1 to W2 jumper installed at the unit when using a
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*CONT802 or *CONT803 Comfort Control?
Have the air conditioning systems been checked at the service
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ports for charge and leak tested if necessary?
Does the condenser fan and indoor blower turn free without
●
rubbing, and are they tight on the shafts?
Has the indoor blower speed been determined and the proper
●
speed been set?
Has all work been done in accordance with applicable local
●
and national codes?
Are all covers and access panels in place to prevent air loss
●
and safety hazards?
Starting the Unit in the Cooling Mode
NOTE: See the section on "Sequence of Operation", page 24,
for a description of the cooling operating sequence.
To start the unit in the cooling mode, set the comfort control
to COOL and adjust the cooling setpoint below the room
temperature.
Wait for the minimum compressor off time to
elapse. The condenser (outdoor) fan motor, compressor, and
evaporator (indoor) fan motor will operate automatically.
Page 22
Operating Pressures
After the unit has operated in the cooling mode for a short
period of time, install pressure gauges on the gauge ports of
the discharge and suction line valves. Check the suction and
discharge pressures and compare them to the normal operating
pressures provided in the unit's SERVICE FACTS.
NOTE: Do not use the pressures from the unit's SERVICE
FACTS to determine the unit refrigerant charge. The correct
charge is shown on the unit nameplate. To charge the system
accurately, weigh in the charge according to the unit nameplate.
Voltage
With the compressor operating, check the line voltage at the
unit. The voltage should be within the range shown on the unit
nameplate. If low voltage is encountered, check the size and
length of the supply line from the main disconnect to the unit.
The line may be undersized for the length of the run.
Cooling Shut Down
Set the comfort control to OFF or adjust the cooling setpoint
above the room temperature.
Starting the Unit in the Heat Pump Heating Mode
NOTE: See the section on "Sequence of Operation", page
23, for a description of the heat pump heating operating
sequence.
Check to make sure all grilles and registers are open and all unit
access doors are closed before start-up.
The comfort control may be temporarily operated in Manual Test
Mode for the *CONT402 or in Installer System Test mode for the
*CONT802 AND *CONT803. These are modes designed to be
used to "bump" the system on the various capacity stages. Since
the test mode timeouts are 1 minute and 5 minutes respectively
(in the absence of installer key presses), these modes are not
designed to be used as the only means of system checkout.
Normal thermostat operation should be used for operating the
unit for extended periods of time.
To start the unit in the heat pump heating mode, set the comfort
control to HEAT and adjust the heating setpoint slightly above the
room temperature. Wait for the minimum compressor off time to
elapse. The condenser (outdoor) fan motor, compressor, and
evaporator (indoor) fan motor will operate automatically.
Heat Pump Heating Shut Down
Set the comfort control to OFF or adjust the heating setpoint
below the room temperature.
Gas Furnace Heating Cycle
In addition to the heat pump controls, these units are equipped
with a solid-state ignition control that lights the burners each
time the thermostat calls for heat. The burners are extinguished
during the OFF cycle.
NOTE: See the section on "Sequence of Operation", page
24, for a description of the heating operating sequence.
The gas heating section of the unit can be started using the
following procedure:
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