Page 73
Corp. 1244-L9
Load demand is greater than
system capacity.
Low refrigerant due to leak.
Internal compressor high or low
pressure leak.
Refrigerant flow
issue.
Possible heat loss due to poor line
set insulation.
Verify line set is properly insulated. If insulation is
missing then repair.
Block indoor or outdoor coil.
Clean indoor or outdoor coil.
Set fan speed to middle or high speed.
Insufficient air
flow
Fan speed is not constant. or
running at lower speed that
configured.
Damage
capacitor
Replace capacitor.
Improper outdoor unit installation.
Proper ventilation around outdoor unit is
required for correct unit operation.
Reposition unit to required clearances.
Poor system performance.
Repair leak, check refrigerant
charge and adjust accordingly.
Recommend installing a field-proved cover over the the
outdoor unit. If cover does not resolve problem, then a higher
capacity system may be required. Replace system.
Incorrect temperature setting.
Adjust temperature set point.
Check heating or cooling load calculations.
Possible refrigerant flow
restriction.
Reversing valve malfunction (heat
pump only).
Replace reversing valve
Replace compressor.
Locate source of restriction and correct.
Indoor fan speed set to low.
Air filter blocked.
Clean or replace air filters
Fan motor
damaged
Replace fan motor.
Outdoor air temperature is too high
POOR SYSTEM OPERATION (ALL SIZES)
FIGURE 84
