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Cleaver-Brooks CBH 40 - Chapter 3 Sequence of Operation; General; Circuit and Interlock Controls

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CHAPTER 3
SEQUENCE
OF
OPERATION
A. GENERAL
B. CIRCUIT AND
INTERLOCK
CONTROLS
C. SEQUENCE
OF
OPERATION -
Oil
or
Gas
Applicable
to
Standardly
Equipped
Boilers
With
CB-20
Flame
Safe
Guard
and
Control
System
D. SEQUENCE
OF
OPERATION -
Oil
or
Gas
Applicable
to
Optionally
Equipped
Boilers
With
CIB-40
Flame
Safe
Guard
and
Control
System
IE.
FLAME LOSS SEQUENCE -
C131~20
and
CIB-40
Programmers
A.
GENERAl
This
chapter
outlines
the
electrical
sequencing
of
the
various
controls
through
the
starting
cycle,
ignition
cycle, firing
and
shutdown.
The
timer
in
the
programming
control
sequences
the
operation
of
all
other
controls
and
components
to
provide
an
overall
operating
sequence.
In
the
schematic
type
wiring
diagram
provided
for
the
boiler,
the
grounded
(common)
side
of
the
power
supply
is
shown
as
a
vertical
line
on
the
right
side
of
the
diagram.
All
inductive
compo-
nents
(coils,
solenoids,
transformers,
lights, etc.)
are
connected
to
it.
The
hot
side
of
the
power
sup-
ply
is
shown
as
a
vertical
line
on
the
left
side
of
the
drawing.
All
the
inductive
components
are
con-
nected
to
it
through
switches
or
contacts
that
per-
mit
the
component
to
function
when
required.
Abbreviations
for
the
various
electrical
compo-
nents
are
listed
in
Figure
3-3.
The
sequences
outlined
in
this
chapter
also
employ
these
desig-
nations
to
aid
in
applying
the
text
to
the
wiring
diagram.
For
an
explanatory
booklet
on schematic wiring
diagrams, request Cleaver-Brooks
Bulletin
C17-
4095.
The
burner
and
control
system
are
in
starting
condition
when
the
following
conditions
exist:
Boiler
water
is
up
to
correct
level
closing
the
low
water
cut-off
switch.
The
operating
limit
pressure
control
(steam
boiler)
or
the
operating
limit
temperature
control
(hot
water
boiler)
and
high
limit
pressure
or
temperature
control
are
below
their
cut-off
setting.
All
entrance
switches
are
closed
and
power
is
present
at
the
line
terminals
of
the
forced
draft
fan
starter.
These
sequences
do
not
attempt
to
correlate
the
action
of
the
fuel
supply
system
or
feedwater
system
except
for
the
interlock
controls
that
di-
rectly
relate
to
the
action
of
the
programming
re-
lay.
Chapters
4
and
5
contain
operating
instruc-
tions
and
specific
information
on
setting
and
ad-
justing
the
controls.
B. CIRCUIT AND
INTERlOCK
CONTROlS
The
burner
control
circuit
is a
two
wire
system
de-
signed
for 115
volt,
single
phase,
60
Hz
(cycles),
alternating
current.
The
programming
control
will
also
operate
on
50
Hz,
however,
the
timing
values
must
be
multiplied
by
1.2.
Control
circuit
power
is
extended
to
programmer
terminals
Ll
and
L2.
The
hot
line
is
extended
to
programmer
terminals
3
and
4
thru
limit
controls.
The
controls
used
in
the
limit
circuit
vary
depend-
ing
upon
the
fuel -
oil
or
gas
-
and
the
specific
requirement
of
applicable
regulatory
bodies.
Refer
to
the
boiler
wiring
diagram
to
determine
the
con-
trols
provided.
The
controls
normally
used
are
listed
below
and
referred
to
in
the
following se-
quence:
Burner
switch
(BS)
Operating
limit
pressure
or
temperature
control
(OLC)
3-1

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