Klimaire 13 SEER Series - Manual (Page 17)

7.0 SYSTEM OPERATION
7.1 COMPRESSOR CRANKCASE HEATER(CCH)
Refrigerant migration during the off cycle can result in a noisy start up. Add a crank-
case heater to minimize refrigeration mirgration, and to help eliminate any start up
noise or bearing
“wash out”.
All heaters are located on the lower half of the compressor shell. Its purpose is to drive
refrigerant from the compressor shell during long off cycles, thus preventing damage
to the compressor during start-up.
At initial start-up or after extended shutdown periods, make sure the heater is ener-
gized for at least 12 hours before the compressor is started. (Disconnect switch on and
wall thermostat off.)
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7.2 PROTECTION FUNCTION INTRODUCTION
Sensor T3 (condenser pipe temperature) and T4 (outdoor ambient temperature)
When open-circuit, compressor, outdoor fan motor and reverse valve will be OFF.
Discharge temperature protection (Heat pump only)
When discharge temp. > 275
°
F , compressor will stop.
When discharge temp. < 194
°
F , compressor will restart.
High perssure protection (Heat pump only)
When high pressure > 638 PSIG, compressor and outdoor fan motor will stop.
When high pressure < 464 PSIG, compressor and outdoor fan motor will restart
(3 minutes delay necessary).
Low pressure protection (Heat pump only)
Low pressure < 21 PSIG, compressor and outdoor fan motor will stop.
Low pressure > 44 PSIG, compressor and outdoor fan motor will restart
(3 minutes delay necessary).
In stand-by status, the compressor will not start in low pressure protection.
Within 30 mins, if 4 protection cycles occurs, system will restore after power cut-down.
Charge for all systems should be checked against the Charging Chart inside the
access panel cover.
IMPORTANT:Do not operate the compressor without charge in system. Addition of
R-410A will raise pressures (vapor, liquid and discharge).
If adding R-410A raises both vapor pressure and temperature, the unit is over-
charged.
IMPORTANT: Use industry-approved charging methods to ensure proper system
charge.
8.1 CHARGING BY LIQUID PRESSURE
The liquid pressure method is used for charging systems in the cooling and heating
mode. The service port on the liquid (small valve) and suction (large valve) is used
for this purpose.
Verify that the outdoor unit is running and the indoor air mover is delivering the
maximum airflow for this system size. Read and record the outdoor ambient tem-
perature. Read and record the liquid and suction pressures at the ports on the liquid
and suction valves.
If refrigerant lines are sized using the nameplate charge, the correct liquid pressure is
found at the intersection of the suction pressure and the outdoor ambient.
1. Remove refrigerant charge if the liquid pressure is above the chart value.
2. Add refrigerant charge if the liquid pressure is below the chart value.
When T4 < 5 °
F , compressor will stop.
When T4 > 10.4
°
F , compressor will restart.
8.CHECKING REFRIGERANT CHARGE