Bradford White EF Series Service Manual page 28

Check Collector Pressure
Check exhaust collector pressure at the exhaust
collector pressure tap location (see illustration below). Is
there positive pressure equal to or greater than
pressure switch settings below?
EXHAUST PRESSURE SWITCH SETTINGS
EF(60,100)T199
EF100T150
EF60T150,EF100T250
EF60T125
EF100T300
Note 1: +5.6" W.C. on serials prior to AH5039107
Note 2: +0.8" W.C. on serials prior to AK5288269
Inspect the area housing the combustion
system and control panel located at the
top of the heater.
Does the area show signs of corrosion
and/or exssesive heat?
Remove combustion assembly
Inspect combustion chamber
for blockage or debris
accumulation
technical support
Page 28
Exhaust Pressure Switch Testing and Replacement
+2.58" W.C.
+1.50" W.C.
(see note 1)
+1.22" W.C.
+2.08" W.C.
+0.55" W.C.
(see note 2)
N
Y
N
(see pg 20)
Y
N
Call for
Service Procedure EF-VI
With monometer, take a
reading at the exhaust
Y
tube pressure tap location.
Is value negative (-)?
(see illustration below).
Y
Call for
technical support
Clear obstruction.
Determine cause
and correct.
Exhaust tube
Exhaust Tube
pressure tap location
pressure tap location
Exhaust Tube Exhaust tube
at bottom of heater
at bottom of heater
Is exhaust venting
N
Y
system blocked or
obstructed?
N
Is vent system total
length compliant with N
vent tables in the
instruction manual?
Y
Replace
exhaust pressure switch.
(see pg 29)
Exhaust collector
Exhaust collector
pressure tap location
pressure tap location
Clear obstruction.
Determine cause
and correct.
Reconfigure vent
system to be
compliant with
vent tables on
page 7.
Page 28