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Cleaver-Brooks CBH 40 - CHAPTER 1 GENERAL DESCRIPTION AND PRINCIPLES OF OPERATION; A. THE BOILER; B. THE BURNER AND CONTROL SYSTEM

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CHAPTER 1
GENERAL
DESCRIPTION
AND
PRINCIPLES
OF
OPERATION
A. THE BOILER
B. THE BURNER AND
CONTROL
SYSTEM
C.
CONTROL
AND
COMPONENT
fUNCTION
D. AUTOMATIC IGNITION
IE.
COMBUSTION
AIR
f.
OIL
fUEL
flOW
G.
GAS
fUEL
flOW
A.
THE BOILER
The
Cleaver-Brooks
Model
"CBH"
Boiler
is a
packaged
steel
boiler
consisting
of
a
pressure
vessel, oil
or
gas
burner,
burner
controls,
forced
draft
fan,
air
control
damper,
and
associated
com-
ponents.
The
boiler
is a four
pass
horizontal
firetube
up-
draft
boiler.
The
pressure
vessel is
constructed
in
accordance
with
the
ASME
Boiler
and
Pressure
Vessel Code.
Chapter
2
deals
with
tfiis
portion
of
the
boiler.
This
manual
covers
boilers
designed for
high
or
low
pressure
steam
or
hot
water
generation
in
capacities
rated
from 25
thru
100
horsepower.
The
boiler
and
related
equipment
installation,
by
others,
is
to
be in
compliance
with
the
standards
of
the
National
Board
of
Fire
Underwriters.
In-
stallation
should
also
conform
to
state
and
local
codes governing
such
equipment.
Prior
to
in-
stallation,
the
proper
authorities
having
jurisdic-
tion
are
to
be
consulted,
permits
obtained
etc. All
boilers
in
the
above
series comply, when
equipped
with
optional
equipment,
to
Factory
Insurance
Association Div.
of
Industrial
Risk
Insurers
(F.I.A.),
Factory
Mutual
(FM)
or
other
insuring
underwriters
requirements.
B. THE BURNER AND
CONTROl
SYSTEM
The
type
of
fuel used
by
the
boiler
determines
the
series
classification.
These
are:
Series
100
Series 200
Series
700
Light
oil (No. 2)
only
Light
oil (No. 2)
or
gas
Gas
only
A
boiler
equipped
to
burn
oil
and
gas
includes
equipment
for
each
distinct
fuel. Since
the
burner
uses
only
one
type
of
fuel
at
a
time,
a gas/oil selec-
tor
switch is
incorporated
in
the
combination
units.
The
Model
CBH
boiler
has
the
burner
assembly
attached
to
the
front
head,
readily
accessible for
inspection
and
maintenance.
The
oil
burner
is
of
the
high
pressure
atomizing
type
and
the
gas
burner
is
of
the
high
radiant
annular
entry
type. A
gas
burner
is ignited by a
gas
pilot
which is
spark
ignited. A
burner
that
uses
light
oil fuel
only
is
normally
spark
ignited.
A
combination
gas-oil
unit
uses a
gas
pilot
for
ignition
of
both
fuels.
The
standard
burner,
whether
firing on oil
or
gas,
operates
at
two
burning
rates
- high fire
and
low
fire. An
optionally
equipped
gas-fired
boiler
operates
on
a
modulating
firing
principle.
The
bur-
ner
and
its
components
are
described
in
detail
later
in
this
manual.
Combustion
air
is
provided
by a
centrifugal
blower
located
in
the
front
head.
Combustion
air
delivery
to
the
burner
is
under
the
control
of
the
damper
motor.
This
same
motor
regulates
the
flow
of
gas
fuel
through
a
linkage
system
connected
to
the
gas
butterfly
valve
or
by
actuating
switches
that
energize
the
oil
valves.
Fuel
input
and
air
are
thus
properly
proportioned
for
most
efficient
combus-
tion.
An
electronic
safety
control
programs
the
sequence
of
operation
and
in
conjunction
with
a
flame
detec•
tor
monitors
the
flame
to
shut
the
burner
down
in
the
event
of
loss
of
flame.
Other
safety
controls
shut
the
burner
down
under
low
water
conditions
or
excessive
steam
pressure
or
water
temperatures.
The
burner
control
circuit
operates
on
115
volt,
single
phase
60
hertz
(or 50
hertz
when
equipped)
1-1

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