Carrier 31MC User Manual
Page 11
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Check for Short Circuits — Use an ohmmeter to
check resista'nce between the outside frame of the
cell and the high-voltage contact. In each case, the
resistance should be infinite (open circuit).
CHECK TOP GUIDE ^ (2000 Cfm Models)
1. Remove top guide assembly from cabinet by
removing the single screw below junction box.
See Fig. 5.
2.
Using ohmmeter, check for shorts between
contact spring and ground. Resistance should
be infinite.
3. Examine insulators for cracks or heavy dirt
buildup. Clean if dirty; replace if cracked.
CHECK SURGE RESISTOR - See Step 7 under
Diagnostic Tests.
The function of the surge resistor is to protect
the power supply from instantaneous “spikes” of
high-voltage power that occur when the unit arcs.
This important component must be operating
satisfactorily to adequately protect the power
supply. Do not bypass.
CHECK LIGHT AND LIGHT CIRCUIT - See Step
9 under Diagnostic Tests.
1 — Ground Wire
2 — Patch Cord for 115-v
Supply Voltage
3 — High Voltage Wire
(7500-v DC)
4 — Voltmeter with 25-Kv
DC Probe
5 — High Voltage Lead from Meter
6 — Common or Ground Lead
from Meter
Fig. 18 — Test Circuit Between Power Door
and Cabinet
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