Carrier 31KAX - Manual (Page 11)

ELECTRICAL TROUBLESHOOTING FLOW CHART
A91482
put at the receptacle with voltmeter. Reading should be
approximately 120 volts (240 for 240V conversions).
During normal operation, power to the cabinet should only be
activated while system blower is operating. DO NOT operate
electronic air cleaner when blower is off, to avoid building up an
undesirable concentration of ozone.
5. Remove access panel on power door and visually check to
see that all wire connectors are firm and that wires are not
broken. (Repair or replace with 18-gauge wire minimum.)
6. Inspect ceramic insulators for dirt or damage. (Clean or re­
place.) Deterioration of metal around insulator indicates
defective insulator (Replace).
a. Inspect for visual damage (Replace.)
A WARNING
A possible shock hazard exists. Do not allow arcing for a
prolonged period of time. The power supply output can be
checked with a high-voltage voltmeter. The output should
read between 9000 and 11000 VDC. If the output is below
7500 VDC, replace the power supply.
7. Check switch and light circuit by applying electrical power
to plug on power door. This can be accomplished with
jumpers from cabinet receptacle. Attach grounding wire
between power door base and cabinet.
A WARNING
A possible shock hazard exists. Be careful not to short out
the power supply. The buss bar and contact plate carry live
high voltage current on - 7300 VOC, 1 MA
The L.E.D. light circuit output can be checked with a voltme­
ter. The reading should be 4VAC.
8. Check power supply. (See Fig. 18.)
a. Place screwdriver on ground plate (access panel) and at
same time move shank portion of screwdriver towards
high-voltage output of power supply. If arcing occurs
when screwdriver comes within approximately 1/8 in.
of power supply, then power supply is operating prop­
erly. If no arcing occurs, power supply is defective. (Re­
place power supply.)
b. Use high voltage tester. Voltage output should be be­
tween 9000 and 11000 VDC.
11