Check Collector Pressure - Bradford White EF100T150(E)*(N Service Manual

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 +2.58" W.C.
EF100T150 +1.50" W.C.
EF60T150,EF100T250 +1.22" W.C.
EF60T125 +2.08" W.C.
EF100T300 +0.55" W.C.
Note 1: +5.6" W.C. on serials prior to AH5039107
Note 2: +0.8" W.C. on serials prior to AK5288269
N
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?
N
Remove combustion assembly
(see "Combustion System
Removal Procedure")
Inspect combustion chamber
for blockage or debris
accumulation
N
Call for
technical support
Exhaust Pressure Switch Testing and Replacement
For serial numbers prior to "CF"
With monometer, take a
reading at the exhaust
Y
tube pressure tap location.
Is value negative (-)?
(see note 1)
(see illustration below).
(see note 2)
Y
Call for
technical support
Clear obstruction.
Y
Determine cause
and correct.
Is exhaust venting
N
system blocked or
obstructed?
Y
Is vent system total
length compliant with
vent tables in the
instruction manual?
Replace
exhaust pressure switch.
(see "Exhaust Pressure Switch
Replacement Procedure")
Exhaust Tube
pressure tap location
Exhaust tube
at bottom of water
heater
Clear obstruction.
Y
Determine cause
and correct.
N
Reconfigure vent
system to be
N
compliant with
vent tables (see
"Specifications").
Y
Exhaust collector
pressure tap location
55
55