7
hEat pump 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 filters at the beginning
of each heating and cooling season, or more frequently
if needed.
• Inspect the 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.
REfRigERant chaRging
WaRning:
this split system heat pump is shipped charged
with R410a refrigerant and ready for installation.
if repairs make it necessary for evacuation and
charging, it should only be attempted by qualified
trained personnel thoroughly familiar with this
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.
• To achieve rated capacity and efficiency, the compressor
must be exposed to refrigerant for at least 24 hours prior
to running and then the compressor must be run for a
minimum of 12 hours.
• Cooling mode charging charts and tables are applicable
only to matched assemblies of this equipment and listed
airflows for the indoor coil. Refer to the Quick Reference
Data sheet for additional charging information.
Outdoor units with non-AHRI listed indoor coils are not
recommended and deviations from rated airflows or
non-listed combinations may require modification to the
expansion device and refrigerant charging procedures
for proper and efficient system operation. For correct
system charging, refer to
• The refrigerant charge can be checked and adjusted
through the service ports provided external to the outdoor
unit. Use only gage line sets which have a “Schrader”
depression device present to actuate the valve. A
common suction port for heating mode charging is
included and located on the compressor access panel
above the outdoor unit service valves.
• Heat Mode Verification Tables are provided for quick
reference when the unit is in heating mode and for the
inspection of the liquid line pressures and temperatures.
See
,
,
.
• A high-pressure switch is factory-installed and located in
the compressor discharge line internal to the outdoor 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 575 psig, then the switch
will open and de-energize the outdoor unit. The switch
will close again once the liquid pressure decreases
to 460 psig. Please note that the switch interrupts the
thermostat inputs to the unit. When the switch opens
and then closes, there will be a 5 minute short cycling
delay before the outdoor unit will energize.
charging the unit in ac mode
(With Outdoor Temperatures Above 55° F for Optimized
Sub-Cooling of 10° F to 12° F)
1. With the system operating at steady-state, measure the
liquid refrigerant pressure (in psig) at the outdoor unit
service valve.
2. Measure the liquid refrigerant temperature (in
Fahrenheit) at the service valve.
3. Determine the appropriate liquid refrigerant pressure
from
,
• If the pressure measured in Step 1 is greater than
the 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
liquid refrigerant pressure determined in Step 3, there
is too little charge in the system. Add refrigerant and
repeat Steps 1 through 3 until the system is correctly
charged.
Summary of Contents for 024KA
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