Page 11
Installer’s Guide
Starting the Unit In the Cooling Mode
IMPORTANT:
Before starting the system in the cooling cycle, turn the
thermostat switch to "OFF" and close the unit disconnect switch. This
procedure energizes the compressor crankcase heat (if equipped) thereby
vaporizing any liquid R-410A in the crankcase. This is a precaution
against foaming at start-up which could damage the compressor. Allow
the heat to operate for a minimum of eight (8) hours.
The 4WHC3048-060F
units do not have sump heat as shipped.
NOTE: The crankcase heater is a field installed option on some models.
NOTE:
See the section on "Sequence of Operation" for a description
Pre-Start Quick Checklist
•
Is the unit properly located and level with the proper
clearance? See Figures 1-2, pages 4-5. See Step 2-Re
view Location and Clearances on page 4.
•
Is the duct work correctly sized, run, taped, insulated, and
weatherproofed with proper unit arrangement? See
Ductwork Installation section on page 16.
•
Is the condensate line properly sized, run, trapped, and
pitched? See Condensate Drain Piping section on page
16.
•
Is the filter of the correct size and quantity? Is it clean and
in place? See Air Filter Installation section on page 17.
•
Is the wiring properly sized and run according to the unit
wiring diagram? See Electrical Wiring section on page 17.
•
Are all the wiring connections, including those in the unit,
tight? See Electrical Wiring section on page 17.
•
Has the unit been properly grounded and fused with the
recommended fuse size? See Electrical Wiring section on
page 16.
•
Is the thermostat well located, level, and correctly wired?
See Electrical Wiring section on page 17.
•
Have the air conditioning systems been checked at the ser
vice ports for charge and leak tested if necessary?
•
Do the condenser fan and indoor blower turn free without
rubbing, and are they tight on the shafts?
•
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?
of the cooling operating sequence.
•
To start the unit in the cooling mode, set the thermostat system switch
to COOL. Move the thermostat COOL indicator to a setting below room
temperature. The outdoor fan motor, compressor, and evaporator fan motor
will operate automatically.
Operating Pressures
After the unit has operated in the cooling mode for a short 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.
Voltage
With the compressor operating, check the line voltage at the unit. The volt-
age 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
•
Place the system selector switch in the OFF position or reset the ther-
mostat at a setting above the room temperature.
•
Do not de-energize the main power disconnect except when the unit is
to be serviced. Power is required to keep the compressor crankcase heat (if
equipped) energized and boil off refrigerant in the compressor.
Starting the Unit in the Heating Mode
NOTE: See the section on "Sequence of Operation" for a description
of the heating operating sequence.
•
Check to make sure that all grilles and registers are open and all unit
access doors are closed before start-up.
•
To start the unit in the heating mode, set the thermo-stat system switch
to HEAT. Move the thermostat HEAT indicator to a setting above room
temperature and place the fan switch in the AUTO or ON positions. The
indoor fan motor will operate automatically.
•
The thermostat must provide a "G" signal for fan operation. If using
an auto changeover thermostat, see Figures 5 and 6 for the appropriate
connections.
Heating Shut-Down
•
Place the system selector switch to the OFF position or place the heat-
ing selector lever at a setting below the room temperature.
THIS PRODUCT CONTAINS FIBERGLASS WOOL INSULA-
TION!
Fiberglass dust and ceramic fibers are believed by the State of
California to cause cancer through inhalation. Glasswool fibers may
also cause respiratory, skin, or eye irritation.
This warning complies with State of California law, Proposition 65.
▲
WARNING
!
Starting the Unit
