10. If no voltage is present, remove the second cell.
Install cell number one and measure voltage as
described in step #7. If voltage is present, the second
cell, which is now out of the cabinet, is shorted. Refer
to COMMON TROUBLESHOOTING TECHNIQUES
(pg. 9).
11. If no voltage is present, remove both Ionizing-
Collecting Cells and measure the power supply
output. While depressing the safety interlock switch
lever, touch the end of the high voltage probe to
either the front or rear contact board assembly. The
meter should read 6.2 KVDC or higher.
12. If no voltage is present, check the transformer. Set
the Multimeter for reading AC voltage at 200 volt full
scale and attach meter test leads to the junction of
the transformer secondary leads and the circuit
board. The meter should read 24 volts +/– 4 volts.
13. If there is no voltage from the transformer, replace
the transformer and power supply board.
Measuring Voltage at Ionizing Collecting
Cell
Measuring Voltage at Contact
Board Assemblies
Troubleshooting
24
For Qualified HVAC
Installer Only
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