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Troubleshooting
50. CD Models: No Heat With Vend Satisfied and Unit Running (continued)
208-240 Volt/60 Hertz/3 Phase Gas Nonreversing
NOTE: All voltage checks are referenced to neutral unless stated otherwise.
Is
there voltage to
the input of the
adjustable bulb
thermostat?
TMB2177S-b
Does the
igniter spark?
Check for proper igniter
gaps and resistance for
high voltage lead. (Proper
gaps for igniter are 5/16
above burner and 5/32
between electrode and
grounding tab. The proper
resistance of the high
voltage lead is between
5,000 Ohms and 25,000
Ohms.)
Is there voltage
across V1 and V2 of
the IEI board?
Replace
IEI board.
No
Yes
No
Continued from
previous page
Is
there voltage to
the output of the
adjustable bulb
thermostat?
Replace
adjustable bulb
thermostat.
No
Correct wiring
between
thermostat and
switch B.
No
Yes
Is there voltage
across the coils of the
gas valve?
Is
there gas pressure
on the output side
of the gas
valve?
Replace
gas valve.
Check for proper gas
pressure. 3.5 water
column inches for Natural
Gas, 10.5 water column
inches for L.P. Gas.
No
Yes
Is there a
flame?
Unit is
operational.
Yes
No
No
Yes
Correct wiring
between gas
valve and IEI
board.
Is there voltage
to the ignition
control board?
Correct wiring
between IEI
board and
thermostat.
Yes
No
Yes
Yes
Содержание ATB50CG
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