Carrier 58MVP - Manual (Page 45)

Appendix F
Quick Reference Information
PRESSURE SWITCH MAKE/BREAK POINTS
UNIT SIZE (BTUH)
HIGH-PRESSURE SWITCH LOW-PRESSURE SWITCH
Make Point Break Point Make Point Break Point
40,000 1.81 in. wc max 1.63 in. wc
±
0.05 0.75 in. wc max 0.60 in. wc
±
0.05
60,000
80,000
100,000
120,000
1.81 in. wc max 1.63 in. wc ± 0.05 0.95 in. wc max 0.80 in. wc ± 0.05
FLAME SENSOR MICORAMPERAGE
• Microamp Range: 0.5 to 6.0 microamps
• Typical Reading: 4 to 6 microamps
HOT SURFACE IGNITOR OHM READING
• Ohm reading of HSI unused: 45 to 90 ohms (resistance will go up over time)
GAS VALVE OHM READINGS
• M to C: 98 ohms (solenoid coil)
• Hi to C: 1.5 ohm Bridge Rectifier (Use diode test function setting on ohm meter.)
POWER CHOKE
• When you put unit into component test function, measure motor amp draw before power choke. Then repeat component test, but this time
measure amp draw without power choke in line. The amp draw should be higher without power choke. Some ammeters will register a lower
amp draw (look for a change in amperage).
SPECIAL NOTE: ALL VOLTMETERS ARE NOT THE SAME, YOUR VOLTAGE READINGS WILL VARY. THIS
APPLIES TO THE ENTIRE CONTENT OF THIS TROUBLESHOOTING MANUAL.
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