33
TROUBLESHOOTING CONTINUED
43
Communication failure with Unit A
●
●
●
44
Communication failure with Unit B
●
●
45
Communication failure with Unit C
○
○
●
46
Communication failure with Unit D
●
○
●
47
Unit A freeze protection
○
●
48
Unit B freeze protection
○
●
●
49
Unit C freeze protection
●
●
●
50
Unit D freeze protection
●
●
51 Unit
A
overheating prevention protection
○
●
52 Unit
B
overheating prevention protection
●
●
53 Unit
C
overheating prevention protection
●
54 Unit
D
overheating prevention protection
○
○
○
55
Unit A communication wire misconnection or expansion valve malfunction
●
○
○
56
Unit B communication wire misconnection or expansion valve malfunction
○
○
57
Unit C communication wire misconnection or expansion valve malfunction
○
●
○
58
Unit D communication wire misconnection or expansion valve malfunction
●
●
○
Malfunction Checking and Elimination
NOTE
: Discharge power capacities at positions shown below. Voltage should be less than 20v (measured with a meter) prior to initiating
service work.
18k
24/30k
(1) IPM protection malfunction:
Main checking point:
S
Is the input voltage of the unit within the acceptable range?
S
Is the compressor connected correctly?
S
Is the compressor winding resistance correct?
S
Are the heat exchangers clean / unblocked?
S
Is the refrigerant charge correct?
Flow chart:
Summary of Contents for 38GVM Series
Page 14: ...14 WIRING DIAGRAMS A13093 Fig 12 38GVM 18k Wiring Diagram...
Page 15: ...15 WIRING DIAGRAMS CONTINUED A13094 Fig 13 38GVM 24k Wiring Diagram...
Page 16: ...16 WIRING DIAGRAMS CONTINUED A13095 Fig 14 38GVM 30k Wiring Diagram...
Page 17: ...17 WIRING DIAGRAMS CONTINUED A13096 Fig 15 38GVM 36k Wiring Diagram...
Page 18: ...18 WIRING DIAGRAMS CONTINUED A13097 Fig 16 38GVM 42k Wiring Diagram...