10
3. For the temperature measured, determine the required liquid
refrigerant pressure from
,
,
,
,
&
for 1.5, 2, 2.5, 3, 3.5, &
4 ton units. For 5 ton units see
• If the pressure measured in step 1 is greater than the required
liquid refrigerant pressure determined in step 3, then there
is too much charge in the system. Remove refrigerant and
repeat steps 1 through 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, then there
is too little charge in the system. Add refrigerant and repeat
steps 1 through 3 until the system is correctly charged.
Safety switches
The 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.
NOTE: When the switch opens and then closes, there will be
a 5 minute short cycling delay before the unit can energize.
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.
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 add additional oil to motors unequipped with oil tubes.
The compressor is hermetically sealed at the factory and does
not require lubrication.
3. Set the system mode to ON or COOL.
4. Set the temperature mode below room temperature. Verify
that the indoor blower, outdoor fan, and compressor energize
and the cooling function starts.
5. Verify the discharge air grilles are adjusted and the system
air is balanced.
6. Verify the duct work has no air leaks.
7. Verify the condensate drain is installed correctly and functions
properly.
8. Set the temperature mode above room temperature. The unit
should stop.
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. Examine ducts for leaks or obstruction
if insufficient air is detected.
Set the thermostat fan mode to AUTO. The blower should stop
running.
System Cooling
Set the thermostat’s system mode to COOL and the fan mode
to AUTO. Lower 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) Set the thermostat’s
system mode to HEAT and the fan mode to either AUTO
(intermittent air) or to ON (continuous air). Raise the thermostat’s
temperature selector above the existing room temperature and
check the following:
1. The compressor and outdoor fan should not run.
2. The blower will run according to the thermostat’s fan mode
setting.
REFRIGERANT CHARGING
Charging the Unit
(with Outdoor Temperatures Above 65° F)
CAUTION:
This air conditioner contains 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.
NOTE: 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.
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 (° F) at the service
valve.
