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Start-Up
Pre-Start Quick Check List
•Is the unit properly and securely located and level with the
proper clearance?
•Is the ductwork correctly sized, run, taped, insulated and
weatherproofed with the proper unit arrangement?
•Is the condensate line properly sized, run, trapped, and
pitched? Does it drain freely?
•Is the filter of the correct size and number? Are the supply
and return registers unobstructed?
•Is the wiring properly sized and run according to the Unit
Wiring Diagram, Figures 5 and 6?
•Is the power supply correct for the unit's requirements?
•Are all wiring connections, including those in the unit itself,
tight?
•Is the thermostat well located, level, correctly wired, and
accurately adjusted?
•Do the outdoor fan and the indoor fan turn free without
rubbing? Are both fans tight on their shafts?
•Has the indoor blower speed tap been determined and the
proper speed set? See the Unit Wiring Diagram,Figures 5
and 6.
•Has all work been done in accordance to the applicable local
and national codes?
•Are all cover and access panels in place to prevent air loss
and to protect against safety hazards?
•Have all tools and debris around, on top of, and under the
unit been removed?
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 vapor-
izing any liquid HCFC-22 in the crankcase. This is a
precaution against foaming at start-up which could dam-
age the compressor. Allow the heat to operate for a
minimum of eight (8) hours.
The WCH048-060F 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 descrip-
tion of the cooling operating sequence.
•To start the unit in the cooling mode, set the thermostat
system switch to
COOL
. Move the thermostat
COOL
in-
dicator to a setting below room temperature. The outdoor
fan motor, compressor, and evaporatorfan motor will oper-
ate automatically.
Start-Up
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 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
•Place the system selector switch in the
OFF
position
o r
reset the thermostat at a setting above the room tempera-
ture.
•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 descrip-
tion 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
in-
dicator 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
o r
place the heating selector lever at a setting below the room
temperature.
The following warning complies with State of California law, Proposition 65.
▲
WARNING:
This product contains
fiberglass wool insulation!
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.
