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
Check gas (line) pressure to the
water heater.
Minimum linepressure sh ould be
5.5" W.C.
Isgas pressure within proper
specification? (see photo 16)
Determine cause of incorr ect gas
pressure and correct.
Check venting conditions,
clogged vent, down drafts or
negative building pressure
Is vent system okay?
Correct improper
venting condition.
N
Is there sufficient combustion air
beings upplied to the water
heater?
Provide proper
combustion airto
water heater.
N
Checkb urner tubes for scale or
debris build-up. Cleanburner as
necessary.
(see page 12)
Check tank flues for blockage or
debris build-up causing
restriction.
(see page 14)
Checkf or 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