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GAS PIPING
Route
the
gas
piping or tubing
to
the furnace.
Use
th"
black
iron
pipe
or
%" O.D.
copper
tubing If
the
piping
length
exceeds
40',
use
't7^"
black iron pipe
or
'/a" copper
tubing.
When using natural
gas,
branch tubing may be
copper
internally tinned
or
copper tubing containing not
more
than 75
percent
copper. When using
L.P.
gas,
tubing
may be type
K.
Be
sure
to
check local authorities for
any other
requirements concerning
gas piping.
It
is
recommended
that a main shut-off valve be located
in
the
gas
supply line external
to
the furnace. This
shut-
off
valve
is
required by
AGA
as well as some
local
codes.
When making the
connection
at
the
gas
control
valve,
use
a
wrench
on the inlet
side
to
prevent twisting
the
valve body which could result
in
service
problems.
After
connections
have
been
made,
be
sure
all
joints
are
checked
with
soap
suds
to
detect any leaks.
This
should also include
a
check
of
the
furnace
controls
and piping. NEVER CHECK FOR LEAKS
WITH
A
LIGHTED MATCH.
CAUTION: DO
NOT TEST THE FUEL
SYSTEM AT
MORE
THAN 14
INCHES
WATER COLUMN
AFTER
FURNACE HAS BEEN
CONNECTED
TO FUEL
LINE.
ANY
TEST
CONDUCTED
ABOVE 14
INCHES
WATER
COLUMN
MAY
DAMAGE
THE
FURNACE
CONTROL
VALVE AND VOID THE
WARRANTY.
DESCRIPTION
The
B57
Midgitrol
(Coleman Part
No.
7660-3261)
is
a
combination
gas
valve which provides
all
manual
and
automatic control functions required
for
operation of
gas
fired
heating
equipment. This valve
is
suitable for
use
with all
gases.
The
B5l
includes
(l)
permanently lubricated
shear
seal,
disc type gas cock,
(2)
thermomagnet
safety
valve,
(3)
main
line
automatic valve, (4)
pilot
gas
adjust-
ment
valve,
and
(5) pilot line filter and
pressure
regu-
lator
(optional).
OPERATION
The l00\a shut-off
pilot
safety section
operates
from
power
bY
a
2500G
tYPe
thermo-
couple
d
bY
Pilot flame.
In
event
of
low
outage,
safetY
valve
shuts
off all
gas.
Main line automatic
gas
valve
opens
and
closes
in
re-
sponse
to
thermostat
or other controls wired
in
24 volt
circuit.
24
voitt power
is
provided
by an
external
transformer.
INSTALLATION
Use
valve
within following
operating
ranges:
Maximum
operating
pressure:
t/z
psi
(14" WC)
Minimum
operating
pressure:
I oz.
(2"
WC)
Maximum
ambient temperature:
175"F.
l.
Valves
with
Part No.
7660-326
I
are step open
type
and must
be
mounted
upright in
horiz.ontal
line.
INSTALLATION
INSTRUCTIONS
2.
Make sure
all
piping and tubing
is
free
of
foreign
matter.
Apply
thread
seal
to
male threads only.
3.
Connect t7r"
pilot tubing
bween valve
and
pilot
burner
assembly.
Pilot
burner
assembly
m
ust
be
mounted rigidly
in
a position
where
pilot will
ignite
main burner when
it
has been reduced
to
smallest
flame which
will hold
thermomagnet
safety'
valve
open.
4.
t/,s"
external
vent
connection
is
located
at
outlet
end
of
valve. Connect one end
of
vent tube
to fitting
on
valve and position other end
near,
.
but not in,
pilot
flame. Main burner flame must
not
impinge on
gen-
erator cartridge
or
vent
tube.
5.
Make
sure
all wiring
connections are clean
and
tight.
Screw thermocouple bushing
in
fingertight, plus
I
turn. with
small wrench.
DO NOT OVERTIGHTEN.
6.
Refer
to
information furnished
with
furnace
for
proper
heat
anticipator
sctting.
LIGHTING/
RESET
DIAL
EXTERNAL
VENT
CONN
MANI FOLD
PRESS. TAP
PI
LOT
GAS
CONN.
Figure
3.
LIGHTING
PROCEDURE
l.
Turn
thermostat
to
lowest selting.
Turn to PILOT.
Press
dial in
and
light
pilot.
Hold for
60
seconds
and
release.
2.
Turn
dial counterclockwise
to ON.
Use
this position
for
thermostat
control.
Set
thermostat
for
desired
room
temperature.
3. Shut
Down
Procedure.
Press
dial
in
and
turn
clockwise
to
OFF.
Use
this position
when
complete
shut-
down is
necessary.
(Use PILOT
position
lor
temporary or
seasonal
shutdown.)
ADJUSTMENTS
See
Fig.3 for
Location-
Pilot
Cas Adjustment. Remove
pilot
adjustment
cap
screw
and
turn pilot
adjustment screw
to
produce
non-
blowing blue flame covering
top
t7o"
of
thermocouple
tip.
Replace cap
screw.
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