34
TROUBLESHOOTING GUIDE
POSSIBLE CAUSE VERIFICATION SOLUTION
Low Suction Pressure Check blower motor as described on If defective, replace motor.
page 38 in this manual.
Check that filter in return air box is Clean air filter.
clean.
Check system refrigerant charge. Charge to proper subcooling accord-
ing to manufacturer’s instructions.
Check for dirty evaporator coil. Clean evaporator coil.
High Suction Pressure Check for air bubbles in system Charge to proper subcooling accord-
refrigerant. i
ng to condensing unit manufactur-
er’s instructions. Install sight glass
near indoor unit and monitor.
Check calculated heat gain to be Take necessary action.
sure that equipment is sized properly.
Check for obstructions near Remove obstructions.
condensing unit which could cause
recirculation of air.
Low Head Pressure Check system refrigerant charge. Charge to proper subcooling
according to condensing unit
manufacturer’s instructions.
Check calculated heat gain to be sure Take necessary action.
that equipment is sized properly.
High Head Pressure Check condenser fan motor accord- If defective, replace fan motor.
ing to condensing unit manufacturer’s
instructions.
Check for dirty condensing unit coil. Clean condensing unit coil.
Check system refrigerant charge. Charge to proper subcooling
accordi
ng to condensing unit
manufacturer’s instructions.
Check for dirty evaporator coil. Clean evaporator coil.
Check for obstructions near Remove obstructions.
condensing unit which could cause
recirculation of air.
Check for restricted liquid lines. Remove restrictions and kinks from
lines.
Distribution System Air Leaks Check all joints in air distribution Make sure all joints are air tight.
system. Verify static pressure as described
on page 38 in this manual.
CONDITION: ESP-J & CONDENSING UNITS RUN, BUT COOLING INSUFFICIENT
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