Manual
6
BC251686497767en-US0801
Installation & Maintenance
Problem
Possible cause
Confirmation method/Remarks
Fan motor doesn’t rotate,
or rotates at full speed
"F.V.S. pressure setting is
inadequate"
Check the operation of the fan motor.
• Pressure setting value may be too high if the fan motor rotates
continuously at low speed or stops.
=> Turn the F.V.S. pressure adjustment screw in (-) direction to set
the F.V.S. pressure lower.
• Pressure setting value may be too low if the fan motor rotates
continuously at full speed.
=> Turn the F.V.S. pressure adjustment screw in (+) direction to set
the F.V.S. pressure higher.
Note:
- In the event that the F. V. S. pressure setting value is lost
(for XGE-4*), rotate the pressure setting screw fully toward the
(-) symbol, then rotate it 9 times*1 towards the (+) symbol. This
should return the F.V.S. pressure setting value to around the factory
standard setting value of 1.9 MPa.
- Always conduct a test run after changing the setting to confirm
the system operates correctly.
PCB was damaged by drop
impact
If voltage output cannot be obtained, the internal ceramic PCB may
be damaged.
Overcurrent was applied
Check if the rated value of the fan motor is within tolerance.
=> Max. 3A (or 4A conditionally)
• Check if a load is restricting the fan motor rotation. (Such as snow
or freezing.)
• Check if a line-to-line short circuit is detected at a connection
point of the fan motor.
• It is recommended to protect the circuit with a thermal relay or
circuit protector.
Note: Make sure to remove the cause of burn-out before
conducting a test run. Otherwise, burn-out may occur again.
Surge voltage was applied
Check if a lightning surge or similar occurred or not.
PCB burn-out
Burn-out may be caused by water leakage due to an improperly
fitted plug.
Check the following items to find any problems with the fitting.
• Is it tightened to the prescribed torque?
• Is the plug fitted with the attached gasket?
• Is there a gap between the plug and body?
When a screw other than attached one is used, the body may be
damaged allowing water to leak inside, causing burn-out. Do not
use screws other than those attached.
Burn-out of PCB may be caused by water leaking from the
damaged part of the body.
Control is unstable.
In particular, check the connection of the pressure coupling for any
leakage. Leakage may occur when copper gasket is not used or
misaligned.
Check the pressure introduction position
• Receiver valve fully opened
• Filter drier clogged off,
• Shreader core press down.
It is recommended to detect the pressure from the exit side of
condenser.
Cannot fix the plug
Plug fitting screw stripping
Screws may become stripped when they are tightened with a
torque greater than the prescribed value. Please tighten with the
prescribed torque.
Summary of Contents for OP-HJZM
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