High Temperature Protection Of Condenser (Odu P6) - Heat Controller A-VMH18DC-1 Service Manual

Service Manual

9.3.2.10 High temperature protection of condenser (ODU P6)

When outdoor pipe temp. is mroe than 149°F (65°C), the unit will stop, and will run again when outdoor
pipe temp. is less than 126°F (52°C).
High temperature
protection of condenser
Check whether the
condenser temperature is
more than 149°F (65°C)
Yes
Check whether the
outdoor ambient temperature is
higher than 122°F (50°C)
No
Check whether the
heat exchanger is dirty
No
The refrigerant
circuit is blocked
VMH SerieS
Replace the temperature sensor
No
No
Check whether the
resistance of condenser
temp. sensor is correct
refer to the Appendix 1
No
Yes Stop the unit
Yes
Clean the heat exchanger
Evacuate the refrigerant, then use the
high pressure nitrogen or refrigerant to
Yes
blow out the pipes, vacuum and recharge
the refrigerant again
42
Heat Controller, Inc.
Yes Replace outdoor main board
No