Hussmann Super Plus - Page 65

HUSSMANN CORPORATION • BRIDGETON, MO 63044-2483 • Printed in USA
Revised August 1, 1996 P/N 340272A
4 - 25
Troubleshooting—Defrost Board with Mechanical Time Clock
Be sure Board Switch is closed.
Refrigeration Mode
Voltmeter Voltmeter Action
Lead Placement Reading
Lead 1 Lead 2
1 T1 (X1) T11 (X2) 120 Go to 2
0 Check Power Supply to Board
2 P2,1 T11 (X2) 120 Go to 3
0 Check Fuse F1 (5 Amp) – If OK, Board
Failure
3 P2,2 T11 (X2) 0 End Test
120 Defrost timer contacts closed – Correct
and reset system
Defrost Mode
Voltmeter Voltmeter Action
Lead Placement Reading
Lead 1 Lead 2
1 T1 (X1) T11 (X2) 120 Go to 2
0 Check Power Supply to Board
2 P2,1 T11 (X2) 120 Go to 3
0 Check Fuse F1 (5 Amp) – If OK, Board
Failure
3 P2,2 T11 (X2) 120 Go to 4
0 Defrost timer circuit open – Check and
correct
4 T4 T11 (X2) 120 Go to 5
0 Board Failure
5 T5 T11 (X2) 120 End Test
0 Board Failure
For each remote component, determine its board terminals from the wiring diagram,
then use standard test procedures.