8
Short Cycle Protection
1. Set the thermostat system mode to COOL. Observe the
temperature setting of the thermostat and gradually raise
the set-point temperature until the unit de-energizes.
2. Immediately lower the set point temperature of the
thermostat to its original setting and verify that the
indoor blower is energized and outdoor unit remains
de-energized.
3. After approximately 5 minutes, verify the outdoor unit
energizes and the temperature of the discharge air is
cooler than the room temperature.
System Cooling
1. Set the thermostat’s system mode to COOL and the
fan mode to AUTO. Gradually lower the thermostat
temperature setpoint below room temperature and
verify the outdoor unit and indoor blower energize.
2. Verify blower wheel is spinning in direction indicated by
arrow. Feel the air being circulated by the indoor blower
and verify that it is cooler than ambient temperature.
Listen for any unusual noises. If unusual sounds occur,
determine the source of the noise and correct as
necessary.
3. Verify HI and LO refrigerant pressures.
4. Allow the system to operate for several minutes and then
set the temperature selector above room temperature.
Verify the fan and compressor cycle off with the
thermostat.
NOTE:
The blower should also stop unless
fan switch is set to the ON position.
System Heating
1. Set the thermostat's system mode to HEAT and the
temperature mode to below room temperature.
2. Verify the outdoor unit and indoor fan stop running. After
5 minutes, increase the temperature on the thermostat
to it's maximum setting.
3. Verify the outdoor unit and indoor blower energize. Feel
the air being circulated by the indoor blower and verify
that it is warmer than ambient temperature. Listen for
any unusual noises. If unusual sounds occur, determine
the source of the noise and correct as necessary.
Defrost Control Board Test Pins
• Placing a jumper between the test pins for less than 1
second will bypass the Anti-Short Cycle Timer.
• Placing a jumper between the test pins for more than 1
second will force the unit into a defrost cycle. As soon
as the jumper is removed, the defrost cycle will end
as determined by the typical criteria.
• Verify the Status Indicator (on the control board)
against the codes listed in
Table 4
to determine proper
diagnostic description.
STATUS
INDICATOR
STATUS
TYPE
DIAGNOSTIC
DESCRIPTION
C1
Operating Status
Cooling, 1st Stage
H1
Operating Status
Heating, 1st Stage
SC
Operating Status
Anti Short Cycle Timer
OF
Operating Status
Defrost
_.
Operating Status
Power on, no call for operation
01
Fault
Pressure switch, low
02
Fault
Pressure switch, high
03
Fault
Temperature Sensor, Ambient
04
Fault
Temperature Sensor, Coil
05
Fault
Board
OF
(FLASHING)
Input Error
Forced defrost - test short
applied longer than 11 minutes
Table 4. Defrost Control Board Status Indicators
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 required.
• 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.
