Daikin LX10F11B Service Manual page 76

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Symptom
The high pressure is
excessively high.
Solenoid valve internal
leak
Reverse rotation of
condenser fan
Ambient temperature
is high.
Short circuit
Is the condenser
water-cooled?
Low water volume
Water temperature is
high.
Clogged fin of air
cooled condenser
Entering air
Overcharge
Wrong refrigerant type
Cause
Check for
leak from solenoid
valve during pull-down. Is the
temperature in the piping on
the HSV, and RSV
outlet side
Does the condenser
fan rotate reverse?
Is the suction air
temperature at condenser
50° C or higher?
Is the condenser water-cooled?
Visually check for
obstructions on
condenser coil fin
Check for entering
of air referring to
paragraph 4.4.
Overcharge ⇒ Replace the refrigerant.
Water cooling: Water temperature is high,
water cooled condenser is dirty
⇒ Check the facility, or clean or replace
the water cooled condenser.
2-48
Checkpoint
YES
Leak from solenoid valve
⇒ Replace the solenoid valve.
HSV: Hot gas solenoid valve
high?
RSV: Reheat solenoid valve
NO
YES (Reverse rotation)
Check the wiring on secondary
side of magnetic contactor for
condenser fan.
NO (Normal rotation)
YES
Out of operation range
Repair short circuit at discharge air.
NO
YES
NO
Are the valves in water
piping fully opened?
YES
Clogged
⇒ cleaning
NO
Fully open the valve
YES
Is the HPS operated?
NO
Remedy
YES
Shortage of
water volume
⇒ Check the
facility.
NO
YES
Overcharge
Entering of air,
wrong refrigerant
type
⇒ Replace the
refrigerant.
NO
Entering of air,
wrong refrigerant
type
⇒ Replace the
refrigerant.