CHAPTER 7
Control Linkage
Apply a non-gumming, dripless, high tempera-
ture
lubrican~
such
as
graphite or a silicone
derivative
to
all
pivot points
and
moving parts.
Work lubricant
in
well
and
wipe off
any
excess.
Repeat application
at
required intervals
to
main·
tain freedom
of
motion
of
parts.
Solenoid and Motorized Valves
Solenoid valves
and
motorized valves require
no
lubrication.
S.
OIL
HEATERS
ELECTRIC,
STEAM,
HOT
WATER
An annual maintenance
of
these heaters consists
of removing
the
heating element from the shell
and
scraping any accumulation
of
carbonized
oil
or
sludge_
deposits that
may
have collected on the
heat exchanging surfaces.
Before breaking any
of
the
electrical connections
to the electric heating elements, mark
all
wires
and
terminals to assure rapid
and
correct replace-
ment
of
wires.
Finish
the
cleaning process with a cleaning sol-
vent
to
cut
all
hardened deposits from
the
heater
elc~menL
Because
of
the
insulating effect
of
carb-
on
and
sludge, periodic cleaning
is
necessary
to
prevent overheating
of
the
elements.
If
operation
of the heater becomes sluggish, examine the
ele-
ments
at
once
and
clean
as
required.
Inspect
the
shell or tank each time
the
heater
is
removed. Flush
all
accumulated sludge
and
sedi-
ment
from
the tank before reinstalling
the
heater.
The condensate
from
steam oil heaters must
be
safely discharged
to
waste. This waste should
be
checked periodically for
any
traces
of
oil which
would indicate leaking tubes within the heater.
CHAPTER 7-'22.
INSPEcriON
AND
MAINTENANCE
The hot water oil heater (Fig. 7-14) contains a
heat transfer solution.
Oil flows through
an
inner
tube while boiler water surrounds
the
outer tube.
The space between the two
tubes
is
filled with the
heat transfer solution
and
is
connected
to
an
expansion chamber on the rear
of
the
heater. A
visual indicator on this cham her reveals the
presence
of
any oil if
an
oil leak occurs.
A 50/50 solution
of
permanent anti-freeze
and
water
is
generally
used
as
the
heat transfer solu-
tion.
If
there
is
no
danger
of
freezing, plain water
may
be used
as
a replenishment
if
necessary
to
refill.
Evidence
of
oil
in
either
the
steam heater conden-
sate or
in
the
water heater indicator demands
prompt repair.
T.
COMBUSTION
The frequency
of
burner adjustments depends
upon
several factors, including; type
of
burner,
type
of
fuel, load conditions, ambient tempera-
ture,
climatic variables,
and
general maintenance
practices.
The air-fuel ratio should
be
checked monthly
since
this
will alert the operator
to
losses
in
efficiency, which do not produce visible flame
change. Any time maintenance
is
performed
on
the
burner linkage
the
the air-fuel ratio should be
checked. Readjustment
of
the burner
may
be
required due
to
variations
in
fuel composition. A
combustion analyzer should
be
used
to
adjust
air-fuel ratio for maximum operating efficiency.
If
your burner requires adjustments, contact your
Oeaver-Brooks local authorized representative
for
assistance.
750-150
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