9
9. Instruct the homeowner on unit and thermostat operation and
filter servicing.
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. If air is insufficient, examine the
ductwork for leaks or obstructions. Set the thermostat fan mode
to AUTO. The blower should stop running.
System Cooling
Change the thermostat’s system mode to COOL and the fan
mode to AUTO. Set the thermostat temperature selector below
the existing room temperature. Allow the cooling system to
operate for several minutes and check for the discharge of cool
air at the supply registers.
System Heating
(Available only when Electric heat is supplied)
1. Set the thermostat’s system mode to HEAT and the fan mode
to either AUTO (intermittent air) or to ON (continuous air).
2. Set the thermostat’s temperature selector above existing
room temperature:
3. Allow the system to operate for several minutes and check
the supply registers for warm air.
4. Verify the outdoor AC compressor and fan are not running.
NOTE:
The indoor blower will run according to the thermostat’s
fan mode setting.
CAUTION:
The unit should never be operated without a
filter in the return air system. Replace disposable
filters with the same type and size.
• Do not attempt to add additional oil to motors unequipped
with oil tubes. The compressor is hermetically sealed at the
factory and does not require lubrication.
AIR CONDITIONER MAINTENANCE
WARNING:
To prevent electrical shock, personal injury, or
death, disconnect all electrical power to the unit
before performing any maintenance or service.
The unit may have more than one electrical supply.
Proper maintenance is important to achieve optimum
performance from the air conditioner. The ability to properly
perform maintenance on this equipment requires certain
mechanical skills and tools. If you do not possess these skills,
contact your dealer for maintenance. Consult your local dealer
about the availability of maintenance contracts.
Routine maintenance should include the following:
• Inspect and clean or replace air filters at the beginning of each
heating and cooling season, or more frequently if required.
• Inspect the condensate drain and outdoor coil at the beginning
of each cooling season. Remove any debris. Clean the outdoor
coil and louvers as necessary using a mild detergent and
water. Rinse thoroughly with water.
• Inspect the electrical connections for tightness at the beginning
of each heating and cooling season. Service as necessary.
COMPONENT FUNCTIONS
High Pressure Switch (HPS) -
A high-pressure switch is factory-
installed and located in the liquid line internal to the unit. The
switch is designed to protect the system when very high pressures
occur during abnormal conditions. Under normal conditions, the
switch is closed. If the liquid pressure rises above 650 psig, the
switch will open and de-energize the unit. The switch will close
again when the liquid pressure decreases to 460 psig.
Low Pressure Switch (LPS) -
A low-pressure switch is factory-
installed and located in the suction line internal to the unit. The
switch is designed to protect the compressor from a loss of
charge. Under normal conditions, the switch is closed. If the
suction pressure falls below 5 psig, the switch will open and de-
energize the unit. The switch will close again when the suction
pressure increases above 20 psig.
REFRIGERANT CHARGING
CAUTION:
Packaged AC units contain liquid and gaseous
refrigerant under pressure. Adjustment of
refrigerant charge should only be attempted
by qualified, trained personnel thoroughly
familiar with the equipment and safe responsible
refrigerant handling procedures. Under no
circumstances should the homeowner attempt
to install and/or service this equipment. Failure
to comply with this warning could result in
equipment damage, personal injury, or death.
• To achieve rated capacity and efficiency the compressor must
be exposed to refrigerant for at least 24 hours prior to running.
After unit startup, the compressor must run for a minimum of
12 hours.
• The refrigerant charge can be checked and adjusted through
the service ports provided external to the unit. Use only gage
line sets which have a “Schrader” depression device present
to actuate the valve.
Charging an R-410A Unit in AC Mode
(with Outdoor Temperatures Above 55° F)
1. With the system operating in a steady-state, measure the
liquid refrigerant pressure (in psig) at the service valve.
2. Measure the liquid refrigerant temperature (° F) at the service
valve.
3. For the temperature measured, determine the required liquid
refrigerant pressure from your units label or charging charts:
,
, and
• If the pressure measured in step 1 is greater than the required
liquid refrigerant pressure determined in step 3, there is too
much charge in the system. Remove refrigerant and repeat
steps 1 - 3 until the system is correctly charged.
• If the pressure measured in step 1 is less than the required
liquid refrigerant pressure determined in step 3, there is too
little charge in the system. Add refrigerant and repeat steps
1 - 3 until the system is correctly charged.
