McQuay M5ACV 030 CR

No
Under voltage protection (OV/UN Voltage)
Power supply failure
Is Power supply
> 340VAC?
To rectify
Power board faulty
Yes
To replace Power board
Is Power supply
< 310VAC?
No
Yes
No
Pump overload
Main board faulty
Remove * JK8, 97
& 98, is it still
conducting?
To replace Main board
Pump overload
Yes
To rectify
Is voltage of 97,
98 on heat relay
VDC
=
0V?
Yes
No
* JK8 on main board
86