53
PROBLEM
OPERATING MODE
PROBABLE CAUSE
REMEDY
COOLING
HEATING
N)
Frost on compressor
suction side pipe.
⊗
⊗
Thermostatic expansion
valve not working correctly
or equalizer fitting blocked.
Check / clean / replace.
⊗
Faulty water recirculation
pump.
Check /replace pump.
⊗
⊗
Insufficient refrigerant
charge.
See point G.
⊗
⊗
Refrigerant filter clogged.
Clean / replace.
⊗
⊗
Refrigerant line valve not
fully open.
Check / open fully.
O)
Defrost cycle never runs.
⊗
4-way inversion valve de-
excited.
Check valve power supply and
windings / replace valve.
⊗
Incorrect defrost set
Check / ad just set point
P)
Excessive/unusual
operating noise.
⊗
⊗
Pipe vibration.
Fix pipes with brackets.
⊗
⊗
Noisy compressor.
Check / replace.
⊗
⊗
Noisy thermostat valve.
Check / charge refrigerant.
Summary of Contents for KAPPA V 2001
Page 69: ......
