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13
Cooling Mode
When the TEST pins are shorted together for
more than 1 second, the Anti Short Cycle Timer
will be bypassed.
Adjustment of Refrigerant Charge
CAUTION:
This heat pump contains liquid
and gaseous refrigerant under
pressure. Adjustment of refrigerant
charge should only be attempted
by qualifi ed, 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.
• The unit must be charged while both fi rst and
second stages are operating.
• 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. See
Refrigerant Charging Charts (Figures 11 - 14,
pages 14 & 15) for Charging in Cooling Mode.
Charging an R-410A Unit in AC Mode with
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 (° F) at the service valve.
3. For the temperature measured, determine
the required liquid refrigerant pressure
from the appropriate charging charts.
• If the pressure measured in step 1 is greater
than the required liquid refrigerant pressure
determined in step 4, 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 4, then there is too little
charge in the system. Add refrigerant and
repeat steps 1 through 3 until the system is
correctly charged.
Charging an R-410A Unit in Heating Mode
1. Evacuate the refrigerant system.
2. Weigh in the proper charge as shown on the
unit rating plate and use the Heating Charging
Tables 2 & 3 (pages 16 & 17) as a guide. Tables
refl ect conditions at high speed operation. Unit
charge MUST be verifi ed in cooling season.
3. Verify the unit is operating properly according
to the System Heating section on page 12.
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:
• Inspect and clean or replace air fi lters 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 fi lter in the return air
system. Replace disposable fi lters
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.