Midea MGBT-F120W/PN1, Manual

Page: 66 / 169

MCAC-ATSM-2014-09 R410A tropical air-cooled scroll chiller unit 60Hz
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11.3 Typical malfunction solutions
1) High pressure and discharged temperature protection
Yes
No
No
Yes
Yes
Yes
Yes
Yes
High pressure and
discharged
protection.
No
No
Yes
Yes
Yes
Yes
No
No
No
No
High pressure
protection.
Blower stops rotating or rotates in
reversed direction in cooling mode;
water pump is not open or the flow.
EXV cannot start running.
Pressure controller is broken
or the joint is loose.
Fin heat exchanger in cooling mode is
too dirty or aged; or too heavy
encrustation in shell-tube for heating.
EXV, capillary and filter are
dirty, blocking.
Discharged temp.
protection.
See the analysis of
discharge temp. protection
malfunction.
Inspect fan motor and
capacitor (1phase) or
start up the water pump.
Replace EXV or coil.
Replace press controller,
fixed joint.
Clean heat exchanger.
Replace EXV, capillary
and filter.
There is air and filled refrigerant
too much in system.(Generally
occur after maintenance.)
PCB make mistakes to
alarm.
Empty, vacuuming and
append refrigerant if
necessary.
Check if it happened
frequently, if yes, please
replace PCB.
Inform the customer
service center.