Service Manual
Two- Stage Multi Position Furnace
TABLE OF CONTENTS
1. INTRODUCTION 2............................................................
2. UNIT IDENTIFICATION 2.....................................................
3. FURNACE THEORY OF OPERATION 3........................................
4. ELECTRICAL SUPPLY 4......................................................
5. INTERLOCK SWITCH 5......................................................
6. GAS SUPPLY 5..............................................................
7. L.P. PRESSURE SWITCH 7...................................................
8. HIGH ALTITUDE OPERATION 7...............................................
9. BURNERS 7................................................................
10. CHECKING TEMPERATURE RISE 8..........................................
11. ROOM THERMOSTATS 9....................................................
12. CONTROL WIRING 10.......................................................
13. LIMIT SWITCHES 10.........................................................
14. PRESSURE SWITCHES 12...................................................
15. VENT/COMBUSTION AIR PIPING 13..........................................
16. STANDARD VENT TERMINATION 14..........................................
17. CONCENTRIC VENT TERMINATION 16........................................
18. EXHAUST BLOWER 17......................................................
19. CONDENSATE DRAIN TRAP 17...............................................
20. HONEYWELL ST9162A FAN TIMER/FURNACE CONTROL 18....................
21. ST9162A/SV9541Q TESTING SEQUENCE 19..................................
22. HONEYWELL SV9541Q 2--STAGE GAS VALVE/IGNITION SYSTEM 19............
23. HONEYWELL SV9541Q SYSTEM OPERATION 20..............................
24. CHECKING FLAME CURRENT 22.............................................
25. CAPACITORS 22............................................................
26. BLOWER ASSEMBLY 22.....................................................
27. BLOWER ROTATION 27......................................................
28. HEAT EXCHANGER REMOVAL/REPLACEMENT 38.............................
SV9541Q “SMART VALVE” -- Sequence of Operation 39.............................
SV9541Q “SMART VALVE” -- Trouble shooting 40...................................
SV9541Q “SMART VALVE” -- Electrical Variation 42.................................
TECHNICAL SERVICE DATA (N9MPV) 44.........................................
BLOWER PERFORMANCE DATA (*9MPV) 45......................................
TECHNICAL SERVICE DATA (*9MPT) 52..........................................
BLOWER PERFORMANCE DATA (*9MPT) 53......................................
WIRING DIAGRAM (*9MPV) 54...................................................
WIRING DIAGRAM (*9MPT) 58...................................................
APPENDIX OF HELPFUL INFORMATION 60.......................................
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