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Maintenance And Service; Maintenance Intervals; Water Valve; Pilot - Bosch AQ 125BO LP Use And Care Manual

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Maintenance
and service
5
Maintenance
and service
5,1
Maintenance
intervals
The 125 BO requires periodic
maintenance.
The below
time
maintenance
intervals
should
kept
the
unit
operating
for many years.
Every year
_- Inspect inlet water filter screen (5.2)
_- Inspect pilot assembly and flame
(5.3)
_- Inspect burner assembly
(5.4)
Every 2 years
_- Lubricate and clean water valve (5.2)
Every 3 to 5 years
_- Rebuild water valve (5.2)
_- Clean pilot assembly and clean or replace orifice
(5.3)
5.2
Water valve
The water valve is the main control that tells the heater
to fire. If the periodic
maintenance
is neglected,
more
costly damage may occur over time.
Inspecting
inlet water filter
screen
Shut off the installer
supplied
cold water supply valve.
Disconnect
water
pipe going to the back of the water
valve. Remove filter from back of water valve. Clean the
filter and inspect for damage. Replace if the filter is at all
damaged.
Inspect the top of the water valve for signs of
a water leak or corrosion.
If present,
rebuild the water
valve. (See below).
Lubricating
the water valve
A more detailed
instruction
is available on our website
at www.boschhotwater.com.
Shut off all water to the
unit and disconnect
water pipe going to the back of the
water
valve.
Disconnect
water
pipe
going
to heat
exchanger
by
removing
pin and
pulling
pipe
out.
Loosen two set screws at the base of the gas valve and
drop the water valve down. Separate
the two halves by
removing 5 screws on the top of the water valve. Apply
lithium or faucet and valve grease to the pushrod
(see
Fig 13, pos. 23). Inspect and clean the venturi (see Fig
13, pos. 29).
Rebuilding
the water
valve
Several parts within the water valve should be replaced
every 3-5 years. The parts list and instruction
can be
found on our website
at www.boschhotwater.com.
5.3
Pilot
Inspecting
pilot
The pilot should burn with a clean sharp blue flame. The
flame should fully envelope the bend of the flame sensor
rod. If it does not, clean the pilot assembly per
procedure below.
Cleaning
pilot assembly
Disconnect
the flame sensor rod cable and the igniter
cable by pulling gently down. Remove two screws hold-
ing pilot assembly in place. Loosen compression
fitting
and remove pilot assembly. Note: The orifice sits on top
of the compression
fitting DO NOT LOSE. Polish flame
sensor rod and igniter tip with emery cloth. Clean out
pilot assembly
and orifice
with carburetor
cleaner.
If
heater is an LP unit, replace
orifice.
Caution:
Do not
enlarge orifice.
5.4
Main burners
The main burner
flames
should
be blue, with a more
intense blue cone
in the center
core. Yellow
flames
could
be a sign of wrong
size gas orifices
or dirty
burners,
or a blockage
on the heat exchangers
fins. If
some
burners
have yellow
flames
while
others
have
good flames, it is likely that dust, lint or spider webs
have partially clogged
the burner venturis. To clean the
burners, contact
a gas service person.
5.5
Vent assembly
Inspect the draft hood and heat exchanger
fins for signs
of soot build-up
or any other foreign
material
such as
spider webs.
Clean out any debris
found
in the vent
hood. Signs of soot indicate
insufficient
combustion
air
or exhaust draft. Check for vent assembly
blockage
or
combustion
air blockage
on the underside
of the unit.
5.6
Mineral
scale build-up
The 125
BO, when
operated
at lower temperatures
settings,
does
not
accumulate
mineral
build-up.
If
however,
the heater is used at the higher temperature
settings
and the water
has a high mineral
content,
periodic
descaling
may be necessary. The heating coils
should
be flushed
with a descaling
solution.
Consult
your
dealer
or BBT
North
America
for
instructions.
Consult your service person.
16
8716473147

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