520 Indoor / 520 Outdoor Service Manual
Ver. 1.00
54
CONFIDENTIAL
12. Controls and settings
12-1. (A) Diagnosis using the computer board……….………………………………………………………………...... 55
12-1. (B) Diagnosis using the 9007603005…………..……….…………………………………………………………….. 56
12-2. Verifying functionality of computer board, Displaying error code history, and Clearing
error code history memory….......................................................................................………...
61
12-3. Clearing the “101” and “991” error code…………………………………………………………………………… 63
12-4. AFR rod function………………………………………………………………………………………………………………… 64
12-5. Dipswitch settings….………………………………………………………………………………………………………….. 65
12-6. Assigning unit numbers in the Easy-link system…………………………………………………………………. 67
12-7.
12-7.
(A) ON/OFF conditions: Overview………………….………………………………………………………………..
(B) ON/OFF conditions: BTU requirements………………………………………………………………………
68
69
12-8. (A) Pump control ON/OFF conditions (Only for single and Easy-link system)…………………..… 70
12-8. (B) Pump control ON/OFF conditions: BTU requirements………………………………………………….. 71
12-9. Multi-unit system ON/OFF conditions……………….………………………………………………………………. 72
12-10. Operation time for unit rotation………………………..………….………………….……………………………..… 73
12-11.
12-12.
Individual unit operation in easy-link system while parent unit is under abnormal
conditions (Individual operation mode)………………………………………………………….………………….
High Altitude Region Support Software (FM+, FM++ and FM+++)…....………………….……………
74
75
12-13.
12-14.
How to convert unit of set temperature.…………………………………………………………………………….
Control for exhaust temperature (520 Indoor only)………………………………………………..………….
76
77
12-15.
12-16.
Relay selection for the pump control connection……………………………………………………………….
Alarm port terminal……………………………………………………………………………………………………………
78
79
12-17. Adjusting manifold gas pressure………………………………………………………………………………………... 80
12-18. Manually adjusting the fan motor speed………………………………………………………………………….… 82
12-19. Freeze protection system…………………………………………………………………………………………………... 84
12-20. Freeze protection for recirculation systems…………………...…………………………………………………. 86
12-21. Draining the unit and cleaning the inlet water filter…….…………………………………………………….. 88
