High Pressure Protection (Odu P1) (Only For A-Vmh36Qc-1) - Heat Controller A-VMH18DC-1 Service Manual

Service Manual

9.3.2.6 High pressure protection (ODU P1) (Only for A-VMH36QC-1)

pressure protector socket,
check whether the system
temperature is higher than
Check whether the outdoor
unit's airflow is obstructed
Replace outdoor main board
High pressure protection
Is the wiring between
the high pressure switch
and main control board is
connected correctly?
Yes
Is the high pressure
protector broken?
Yes
Short circuit the high
can run normally now?
No
Check whether
the refrigerant
system is ok
Check whether the
outdoor ambient
109.4°F (43°C)?
No
No
Check whether the heat
exchanger is dirty
No
Check whether the
refrigerant circuit has a
blockage
No
VMH SerieS
No Reconnect it properly
Yes Replace high pressure protector
Yes Stop the unit
Yes Remove all obstructions for proper ventilation
Yes Clean the heat exchanger
Evacuate the refrigerant, then use
high pressure nitrogen or refrigerant
Yes
to blow pipe, vacuum and recharge
with refrigerant again
38
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