Accoutrements HIGH ECONOMY GAS FURNACE 1200-103B User Manual
Page 4
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fi.
7.
8
.
9.
10
.
Horizontal
runs
shall
be
as
short
and
direct
as
possible.
The
maximum
length
of
a
single-wall
vent
pipe
shall
not
exceed
75
percent
of
the
height
of
the
vent
system.
The
maximum
length
of
a
Type
B-1
double
wall
flue
connection
shall
not
exceed
100
percent
of
the
height
of
the
vent
system.
All
horizontal
vent
pipe
shall
be
pitched
upward
from
the
furnace at least 1/4 inch per foot.
All
vent
systems
shall
be
adequately
supported
to
maintain
proper
clearances,
to
prevent
physical
damage,
and
to
prevent separation to joints.
Vents
passing
through
an
exterior
combustible
wall
must
use a ventilated wall thimble. See Figure 5.
FIGURE 8 — GAS PIPE SIZES — NATURAL GAS
Vents
passing
through
floors
or
ceilings
must
fire-stopped. See Figure 6 and Figure 7.
be
Length
of
Pipe, Ft.
Pipe Capacity — Btuh Per Hour
Input Pipe Size
1/2"
3/4“
1"
1-1/4"
10
132,000
278,000
520, 000
1,050,000
20
92,000
190,000
350,000
730,000
30
73,000
152,000
285,000
590,000
40
63,000
130,000
245,000
500,000
50
56,000
115,000
215,000
440,000
60
50,000
105,000
195,000
400,000
70
46,000
96,000
180,000
370,000
80
43,000
90,000
170,000
350,000
too
38,000
79,000
150,000
305,000
GAS SUPPLY AND PIPING
general
recommendations
1.
Be
sure
the
gas
line
complies
with
the
local
codes
and
ordinances,
or
in
their
absence
with
National
Fuel
Gas
Code, ANSI Z223.1-1980.
2.
A sediment trap
or drip leg must be installed in
the
supply line to the furnace.
3.
A ground joint union shall be installed
in the gas
line
adjacent to and
upstream from the gas valve
and
downstream from the manual main shut off valve.
4.
A
1/8”
N.P.T.
plugged
tapping
accessible
for
test
gauge
connection
shall
be
Installed
immediately
upstream
of
the
gas
supply
connection
to
the
furnace
for
the
purpose
of
determining the supply gas pressure.
5.
A
manual
shut-off
valve
shall
be
installed
in
the
supply
gas line external to the furnace (see Figure 9 and 10).
6.
Use steel or wrought iron pipe and fittings.
7.
DO NOT thread
pipe too far. Valve distortion
or
malfunction
may
result
from
excess
pipe
within
the
control.
Use
pipe
joint
compound
resistant
to
the
action
of
Liquified
Petroleum
gases
on
male threads
only.
DO NOT use
Teflon
tape. See illustrations below.
LEKGTH OF STANDARD PIPE THREADS (Indus)
EFFECTIVE
OVERALL
PIPE SIZE
LENGTH
LENGTH
OF THREAD
OF THREAD
3/8
3/8
9/16
1/2
1/2
3/4
3/4
1/2-9/18
13/16
1
9/16
1
CHECKING THE GAS PIPING
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h
IT
a
OS*^^ COWTgpL use
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rirc aiOHT CCNGTH bXAVf I SNO THNSADS SAfIS
8.
Refer
to
Figure
8
for
Gas
Pipe
sizes
for
natural
gas.
If
more than one appliance Is supplied from a single line size,
capacity
must
equal
or
axcaed
the
combinad
input
to
all
appliances,
and
the
branch
lines
feeding
the
individual
appliances properly sized for eech input.
Before
turning
gas
under
pressure
into
piping,
all
openings
from
which
gas
can
eacape
should
be
closed.
IMMEDIATELY
AFTER
TURNING
ON
GAS,
the
system
should
be
checked
for
leaks.
This
can
be
done
by
watching
the
1/2
cubic
foot
test
dial
and
allowing
S
minutes
to
show
any
movement,
and
by
soaping
each
pipe
connection
and
watching
for
bubbles.
If
a
leek
is
found,
make
the
necessary
repairs
immediately
and
repeat
the
above
test.
The
furnace
must
be
isolated
from
the
gas
supply
piping
system
by
closing
the
manual
shutoff
valve
on
the
combination
gas
control
valve
during
pressure
testing
of
the
gas
supply
piping
system
at
pressures
up
to
1/2
psig.
The
furnace
must
be
disconnected
from
supply
piping
and
supply
piping
capped
during
sny
pressure
testing
of
supply
piping system at test pressures in excess of 1/2 psig.
Defective
pipes
or
fittings
should
be
replaced
and
not
repeirad.
NEVER
USE
A
FLAME
OR
FIRE
IN
ANY
FORM
TO
LOCATE CAS LEAKS, USE A SOAP SOLUTION.