Page 10
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 weath-
erproofed 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 accu-
rately 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 compres-
sor crankcase heat (if equipped) thereby vaporizing any
liquid HCFC-22 in the crankcase. This is a precaution
against foaming at start-up which could damage the com-
pressor. Allow the heat to operate for a minimum of eight
(8) hours.
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
indicator to
a setting below room temperature. The outdoor fan motor,
compressor, and evaporator
fan motor will operate auto-
matically.
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 name-
plate. 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.
Start-Up
Cooling Shut Down
•Place the system selector switch in the
OFF
position or reset the
thermostat 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 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 thermostat 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
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.
