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DANGER
120 volt exposure. To avoid personal injury,
use caution while performing this procedure.
Condition:
Main burner short cycle
Check gas (line) pressure to the
water heater.
Minimum line pressure should be
5.5" W.C.
Is gas pressure within proper
specification? (see photo 16)
Check venting conditions,
clogged vent, down drafts or
negative building pressure
Is vent system okay?
Is there sufficient combustion air
being supplied to the water
heater?
Y
Check for unstable pilot flame or
oxidize flame rod on pilot
causing weak pilot signal
(See page 9)
Check burner tubes for scale or
debris build-up. Clean burner as
necessary.
(see page 12)
Check tank flues for blockage or
debris build-up causing
restriction.
(see page 14)
Measurements or Jumping Terminals
Not to Damage or Deform Connectors or
Determine cause of incorrect gas
pressure and correct.
N
Correct improper
venting condition.
Provide proper
N
combustion air to
water heater.
Line gas
pressure port
Page 11
SERVICE PROCEDURE D24-III
Main Burner Operation Testing
CAUTION
Be Careful When Making Voltage
Connector Pins.
16
Manifold
Pressure Port
11
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