11
• 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 season. Remove any debris. Clean the coils as
necessary using water or an approved all-aluminum cleaner.
Rinse thoroughly with water.
• Inspect the electrical connections for tightness at the beginning
of each heating and cooling season. Service as necessary.
• Inspect and clean blower housing, motor and wheel.
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.
REFRIGERANT CHARGING
CAUTION:
This heat pump 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.
Charging the Unit in AC Mode
(with Outdoor Temperatures Above 65° F)
1. With the system operating at steady-state, measure the suction
and liquid refrigerant pressures (in psig) at the service valves.
2. Measure the compressor discharge and the ambient air
temperatures (° F).
3. Use
,
,
,
,
to verify system conditions (during cooling mode)
for proper charge amount.
Charging the Unit in Heating Mode
1. Evacuate the refrigerant system.
2. Use
,
,
,
,
,
or
, as a guide and weigh in the proper
charge as shown on the unit rating plate (during heating mode
operation).
NOTE:
Unit charge MUST be verified in cooling
season.
3. Verify the unit is operating properly according to the System
Anti Short Cycle Timer Test
The 5 minute time delay feature can be bypassed by shorting
the TEST pins together.
Heating Mode
When the TEST pins are shorted together for more than 1 second,
the control will switch between defrost mode and heating mode.
Cooling Mode
When the TEST pins are shorted together for more than 1
second, the Anti Short Cycle Timer will be bypassed.
COMPONENT FUNCTIONS
Low Pressure Switch (Select Models)
- This safety switch is
factory installed and located in the suction line internal to the
unit. The switch is designed to protect the compressor if a loss
of charge occurs. Under normal conditions, the switch is closed.
If the suction pressure falls below 20 psig, then the switch will
open and de-energize the unit. The switch will close again once
the suction pressure increases above 35 psig. The low pressure
switch interrupts the thermostat inputs to the unit.
NOTE:
When the switch opens and then closes, there will be
a 5 minute short cycling delay before the unit can energize.
High Pressure Switch
- This safety switch is factory installed
and located in the compressor discharge line internal to the
unit. The switch is designed to de-energize the system when
very high pressures occur during abnormal conditions. Under
normal conditions, the switch is closed.
If the discharge pressure rises above 650 psig, the switch will
open and de-energize the unit. The switch will close again once
the discharge pressure decreases to 460 psig. The high pressure
switch interrupts the thermostat inputs to the unit.
NOTE:
When the switch opens and then closes, there will be
a 5 minute short cycling delay before the unit can energize.
UNIT 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 heat pump. 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:
