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SERVICE PROCEDURE D24-III
Main Burner Operation Testing
CAUTION
Be Careful When Making Voltage
Measurements or Jumping Terminals
Not to Damage or Deform Connectors or
Connector Pins.
DANGER
120 volt exposure. To avoid personal injury,
use caution while performing this procedure.
Condition:
Main burner short cycle
C
heck gas (line) pressure to the
w
ater heater.
M
inimum line pressure should be
5
.5" W.C.
Is gas pressure within proper
specification? (see photo 16)
D
etermine cause of incorrect gas
p
ressure and correct.
Check venting conditions,
clogged vent, down drafts or
n
egative building pressure
Is vent system okay?
Correct improper
v
enting condition.
N
Is there sufficient combustion air
being supplied to the water
heater?
Provide proper
combustion air to
water heater.
N
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)
Check for unstable pilot flame or
oxidize flame rod on pilot
causing weak pilot signal
(See page 9)
Line gas
pressure port
Manifold
Pressure Port
16
Page 11
Y
11