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TROUBLESHOOTING
Ent re un t
Power Supply Off
Apply power, close disconnect
does not run
Blown Fuse
Replace fuse or reset circuit breaker. Check for correct fuses
" Vo tage Supp y Low
If voltage is below m nimum voltage specified on unit data plate
' contact local power company.
Thermostat
Set the fan to "ON" the fan should run. Set thermostat to "COOL'
and owest temperature setting the unit should run in the cooling
mode (reversing valve energized). Set unit to "HEAT" and the highest
temperature
setting, the unit shou d run in the heating mode (reversing
valve deenergized).
If neither the blower or compressor run in all three cases the
thermostat Could be miswired or faulty. To ensure miswired or faulty
thermostat verify that 24 volts is available at the low voltage terminal
strip between 'R" and C' 'Y" and "C" and "O" and "C". If the blower
does not operate verify 24 volts between terminals "G" and ' C".
Replace the thermostat if defective.
unit offon
Discharge pressure
In t'COOEING, mode Lack of or inadequate water flow. Entering watei
high 2iesSuie
t0o high
temperature
is too warml Scaled or plugged Condenser
9
P
I In ' HEATING!I mode" Lack of or inadequate air flow
Blower moperatwe,
contro
t
"
c ogged f ter or restr ct ons n ductwork.
Refrigerant Charge
The unit is overCharged With refrigeranL Reciaim iefiigeiant,
evacuate
and recharge with factor recommended charge.
High preSSure.
Check for defective 0r impioperiy caiibrated high preSSure switch;
unit oversize d
. ReCalCUlate heating and or COoling loads:
cycles
ThermoStat,
ThermOstat installed near a supply air grill; relocate thermostaL
Readjust heat anticipator.
wiring and Controls
Check for defective or improperly calibrated low pressure switch
15
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