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DEFROST CONTROL BOARD
PRESSURE
SWITCH
SAFETY
CIRCUIT
AMBIENT
THERMISTOR
CONNECTION
SERVICE
LIGHT
CONNECTIONS
NOTE- There is an internal
jumper between
PS1 and PS2 terminals.
FIGURE 18
Maintenance
At the beginning of each cooling season, the system
should be checked as follows:
Outdoor Unit
1 - Clean and inspect the condenser coil. You can flush
the coil with a water hose.
2 - The outdoor fan motor is prelubricated and sealed. No
further lubrication is necessary.
Job Name
Job Location
Installer
Nameplate Voltage
Unit Model No.
Minimum Circuit Ampacity
Maximum Overcurrent Protection Size
Electrical Connections Tight?
Supply Voltage (Unit Off)
COOLING SECTION
Refrigerant Lines:
Leak Checked?
Service Valves Fully Opened?
Properly Insulated?
Outdoor Fan Checked?
Liquid Service Valve Caps Tight?
Suction Service Valve Caps Tight?
Voltage With Compressor Operating
DIAGNOSTIC
LEDs
DEFROST
INTERVAL
TIMING PINS
24V
TERMINAL
STRIP
TIMING
JUMPER
TIMING PINS
(seconds)
90
TEST
60
30
Job No.
Serial No.
Supply Amps:
Indoor Filter Clean?
Page 20
3 - Visually inspect connecting lines and coils for evidence
of oil leaks.
4 - Check wiring for loose connections.
5 - Check for correct voltage at the unit while the unit is op
erating and while it is off.
6 - Check amp-draw of the outdoor fan motor.
Unit nameplate _________ Actual ____________ .
Check amp-draw of the compressor.
Unit nameplate _________ Actual ____________ .
NOTE - If the owner complains of insufficient cooling,
gauge the unit and check the refrigerant charge. Re
fer to section on refrigerant charging in this instruc
tion.
Indoor Coil
1 - If necessary, clean the coil.
2 - Check connecting lines and coils for evidence of oil
leaks.
3 - If necessary, check the condensate line and clean it.
Indoor Unit
1 - Clean or change filters.
2 - Adjust the blower speed for cooling. Measure the pres
sure drop over the coil to determine the correct blower
CFM. Refer to the unit information service manual for
pressure drop tables and procedure.
3 - On belt drive blowers, check the belt for wear and prop
er tension.
4 - Check all wiring for loose connections.
5 - Check for correct voltage at the unit (blower operating).
6 - Check amp-draw on blower motor.
Unit nameplate_________ Actual ____________.
WARNING
Electric shock hazard. Can cause inju
ry or death. Before attempting to per
form any service or maintenance, turn
the electrical power to unit OFF at dis
connect switch(es). Unit may have
multiple power supplies.
City
City
Amps:
Technician
Condenser Fan Amps:
Compressor Amps:
Indoor Blower RPM
Blower interlocked with compressor?
S.P. Drop Over Evaporator (Dry)
Condenser Entering Air Temperature
Discharge Pressure
Refrigerant Charge Checked?
Compressor Rotation Checked?
THERMOSTAT
Calibrated?
Properly Set?
Date
State
State
Suction Pressure
Level?
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