Johnson Controls P Series Installation And Maintenance Manual page 33

6.Diagnosis for overload and discharge malfunction (AP1 below is control board of outdoor unit)
Main detection point:
● If the electronic expansion valve is connected well? Is the expansion valve damaged?
● If the refrigerant is leaking?
● If the overload protector is damaged?
Malfunction diagnosis process:
Installation and Maintenance
After the unit
de-energized
for 20 min
If the overload protector SAT
is well connected?
Under ambient temperature, test the
resistance of overload protector with ohmic
If the wiring terminal FA of electron
N
expansion is well connected?
The resistance value of firs t
4 l e ad an d th e fif t h lead
is similar, less than 100
Replace
Replace EKV
overload
coil of electron
protector SAT
expansion valve
Remove
malfunction?
Check refrigerant, if there is
leakage, please refer to
specification
Remove
malfunction?
control board
Y
Y
Y
N
N
Replace
AP1
End
N
Connect wire
well with wiring
N
diagram
Y
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