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START UP & SYSTEM CHECK
Pre-Start Check List
Verify the unit is level and allows condensate to drain.
Verify the outdoor coil and top of the unit are free from
obstructions and debris, and all equipment access/
control panels are in place.
Verify that the duct work is sealed to prevent air leakage.
Verify that the line voltage power leads are securely
connected and the unit is properly grounded.
Verify that the low voltage wires are securely connected
to the correct leads on the low voltage terminal strip.
Verify that the outdoor fan turns freely.
Verify that the power supply branch circuit overcurrent
protection is sized properly.
Verify that the thermostat is wired correctly. The
thermostat system mode should be set to OFF and
the thermostat fan mode should be set to AUTO.
Start-Up Procedure
Close all electrical disconnects to energize the system.
Air Circulation
Leave the thermostat system mode on OFF, and set the
fan mode to ON. Blower should run continuously. Check
the air delivery at the supply registers and adjust register
openings for balanced air distribution. Examine ductwork
for leaks or obstruction if insuffi cient air is detected. Set
the thermostat fan mode to AUTO. The blower should
stop running.
WARNING:
If the unit is equipped with a crankcase heater,
allow 24 hours prior to continuing the start up
procedures to allow for heating of the refrigerant
compressor crankcase. Failure to comply may
result in damage and could cause premature
failure of the system. This warning should be
followed at initial start up and any time the power
has been removed for 12 hours or longer.
System Cooling
1. Set the thermostat's system mode to COOL and the
fan mode to AUTO. Gradually lower the thermostats
setpoint below room temperature and verify the outdoor
unit and indoor blower energize.
2. Feel the air being circulated by the indoor blower
and verify that it is cooler than ambient temperature.
Listen for any unusual noises. If unusual sounds
occur, determine the source of the noise and correct
as necessary.
3. Allow the cooling system to operate for several minutes
and then set the temperature selector above room
temperature. Verify the fan and compressor cycle off
with the thermostat. NOTE: The blower should also
stop unless fan mode is set to ON.
12
System Heating
If the unit has been equipped with optional electric heater
kits, set the thermostat's system mode to HEAT and the
fan mode to AUTO. Verify the compressor and outdoor
fan are not energized but that the blower and heaters are.
Feel the air being circulated by the indoor blower and verify
that it is warmer than ambient temperature. Listen for any
unusual noises. If unusual sounds occur, determine the
source of the noise and correct as necessary.
Refrigerant Charging
WARNING:
Single Packaged Air Conditioners are shipped
fully charged with R-410A refrigerant and ready
for installation. When a system is installed
according to these instructions, no refrigerant
charging is required. If repairs make it necessary
for evacuation and charging, it should only be
done by qualifi ed, trained personnel thoroughly
familiar with this equipment. Some local codes
require licensed installation/service personnel
to service this type of equipment. Under no
circumstances should the owner attempt to
install and/or service this equipment. Failure to
comply with this warning could result in property
damage, personal injury, or death.
The system refrigerant charge can be checked and
adjusted through the service ports provided at the front
panel. Use only gauge lines which have a Schrader
depression device present to actuate the valve.
NOTES:
• To achieve rated capacity and effi ciency the compressor
must be exposed to refrigerant for at least 24 hours
prior to running and then must be run for a minimum
of 12 hours.
• The refrigerant charging charts (Figures 18 - 20,
pages 23 & 24) are applicable to listed assemblies
of equipment and at listed airfl ows for the indoor coil.
Assemblies of indoor coils and outdoor units not listed
are not recommended.
Charging an R-410A Unit in AC Mode at Outdoor
Temperatures Above 65F.
1. With the system operating at steady-state, measure
the liquid refrigerant pressure in psig at the service
valve.
2. Measure the liquid refrigerant temperature in
Fahrenheit at the service valve.
3. For the temperature measured, determine the required
liquid refrigerant pressure from the appropriate
charging charts in Figures 18 - 20.
4. If the pressure measured in step 1 is greater than
the required liquid refrigerant pressure determined in
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