Midco J83-DS - Manual (Page 11)

A. With motor running check burner line voltage terminals for 120V as follows:
1. Between strip terminals L1 and L2 - 120V: voltage OK.
2. Between strip terminals L1 and GND.TERM - 120V: ground OK.
3. Between strip terminals L2 and GND.TERM. - no voltage: no backfeed neutral
OK.
B. Follow test procedure as specified in Step II G.
1. Connect DC microamp meter in series with sense wire and Electronic Control
SENSE terminal. With flame on, flame signal should be steady and at least 2
microamps. Check sense wire for continuity Adjust ignitor gas pressure to
obtain acceptable signal and note gas pressure and signal strength for future
reference.
A. Low gas pressure
B. Air shutter open too far
C. Input adjuster not set properly
A. High gas pressure
B. Air shutter closed too far
C. Insufficient free air in combustion chamber
D. Dirty blower wheel
E. Input adjuster not set properly
A. Defective automatic valve
B. High gas pressure
*Normal low voltage:
Motor running - 24V minimum
Automatic valve energized - 21V minimum
Trouble Chart
III Flame on Only
During 6-Second
Trial for Ignition
IV Short Flame
V Long Hazy Flame
VI Gas Fails to Shut
Off
11