Carrier 59MN7A Troubleshooting Guide download pdf (Page 43)

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APPENDIX C

PRESSURE CHECK DIAGRAM

PRESSURE SWITCH MAKE/BREAK POINTS

UNIT SIZE

(BTUH)

HIGH PRESSURE SWITCH MEDIUM PRESSURE SWITCH LOW PRESSURE SWITCH

Make Point Break Point Make Point Break Point Make Point Break Point

60,000

(17.5” casing)

1.21 in.wc max

1.05 in. wc +/-

0.06

0.85 in. wc max

0.70 in. wc +/-

0.05

0.62 in. wc max

0.47 in. wc +/-

0.05

60,000

(21” casing)

1.46 in.wc max

1.29 in. wc +/-

0.07

1.00 in. wc max

0.85 in. wc +/-

0.05

0.64 in. wc max

0.49 in. wc +/-

0.05

80,000

1.58 in.wc max

1.40 in. wc +/-

0.08

1.00 in. wc max

0.85 in. wc +/-

0.05

0.75 in. wc max

0.60 in. wc +/-

0.05

100,000

1.58 in.wc max

1.40 in. wc +/-

0.08

1.08 in. wc max

0.93 in. wc +/-

0.05

0.87 in. wc max

0.72 in. wc +/-

0.05

120,000

1.58 in.wc max

1.40 in. wc +/-

0.08

1.05 in. wc max

0.90 in. wc +/-

0.05

0.80 in. wc max

0.65 in. wc +/-

0.05

1 2 ... 38 39 40 41 42 43 44 45 46 47 48

59MN7A Series 100 1
TROUBLESHOOTING GUIDE 1
COMPONENT TEST 9
OM-24V if the furnace is 11
OM-24V 11
Status Code 11 15
Status Code 12 15
Status Code 13 16
Status Code 21 17
Status Code 14 17
Status Code 15 17
Status Code 22 18
Status Code 23 18
Status Code 24 19
Status Code 25 21
Status Code 31 22
OM-24V on 23
Status Code 32 25
Status Code 33 27
Status Code 34 29
Status Code 35 31
OM-24V (-)then run 32
Status Code 41 33
Status Code 42 35
Status Code 43 37
Status Code 45 38
APPENDIX A 39
Fig. 2 – Wiring Schematic 40
APPENDIX B 41
APPENDIX C 43
PRESSURE CHECK DIAGRAM 43
APPENDIX D 44
APPENDIX E 46
QUICK REFERENCE INFORMATION 46
APPENDIX F 47
FURNACE STAGING ALGORITHM 47
9-11 48

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