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HEATING A COOLING
58ED,PB
Horizontal Gas-Fired Furnaces
MASONRY CHIMNEY — This furnace can be vented
into an existing masonry chimney. Normal connections
to a chimney are made using single wall pipe; however,
single wall pipe is not approved to pass through any attic,
inside wall or concealed space or through any floor. For
further information, consult venting section of National
Fuel Gas Code.
TYPE B-l VENT — The furnace is also approved for
use with a Type B-l vent that terminates through the roof
(horizontal venting through an outside wall is not
approved). The vent must be terminated with a listed
cap or roof assembly. This venting must be installed in
accordance with the vent manufacturer's instructions
and be in accordance with all local codes.
ATTIC INSTALLATION — Atticand/or National Fuel
Gas installations require the use of Type B orType L vent
material The following requirements are provided for
venting system:
1. Ensure the chimney flue is clear of any dirt or debris.
2. Ensure the chimney is not serving an open fireplace.
3. Never reduce the pipe size below the outlet size of
the furnace.
GAS
SUPPLY
NOTE:
LOCATE MANUAL SHUTOFF VALVE AS REQUIRED
BY THE LOCAL AUTHORITY OR CODE
IN THE
ABSENCE OF SUCH A CODE, LOCATE THE
GAS
MANUAL MAIN SHUTOFF VALVE AT 5 j FT
SUPPLY
GAS PIPE LAYOUT AFTER REVERSING COMPONENTS
Fig. 4 — Gas Pipe Layout
4. All pipe should be supported using the proper clamps
and/or straps
5. All horizontal runs of pipe must have an upward
slope of 1/4 in. per foot.
6. All runs of pipe should be as short as possible with
as few turns as possible.
7. Seams must be tightly joined and checked for leaks.
8
The flue pipe must not extend into the chimney,
but be flush with the inside chimney wall.
9. The chimney or gas vent must extend 3 ft above the
highest point where it passes through a roof of a
building and at least 2 ft higher than any portion of a
building within a horizontal distance of 10 feet. It
shall also extend at least 5 ft above the highest
connected equipment flue collar.
10
Check local codes for any variance.
Step 6 — Connect Gas Piping
— Install gas piping
to provide a supply of gas sufficient to meet the maximum
demand without undue loss of pressure between the gas
meter and the furnace. The gas line to the furnace should
be a separate line direct from the meter, unless the
existing gas line is of ample capacity. Refer to Table 5
for sizing gas piping.
Use a joint compound (pipe dope) resistant to the
action of liquefied petroleum gases or to any other
chemical constituents of the gases to be conducted
through the piping.
Before any system of gas piping is finally put into
service, it should be carefully tested to determine if it is
gas tight. The piping must withstand a pressure of 6 in. Hg
for a period of 10 minutes or as required by local
authority.
A WARNING
The furnace and its individual shutoff valve must be
disconnected from the gas supply system during any
pressure testing of that system at test pressures in
excess of 1 / 2 psig. The furnace must be isolated from
the gas supply piping system at pressures equal to or
less than 1 /2 psig.
The recommended method for installing the gas piping
to the furnace is shown in Fig. 4. Also shown is correct
piping if the gas valve and controls have been reversed
in the field.
Table 5 — Gas Pipe Sizing (Cu Ft of Gas per Hour)*
LENGTH OF
PIPE (ft)
DIAMETER OF PIPE — IPS (in.)
%
%
1
Vk
Vk
10
132
278
520
1050
1600
20
92
190
350
730
1100
30
73
152
285
590
890
40
63
130
245
500
760
50
—
115
215
440
670
75
—
93
175
360
545
100
—
79
150
305
460
150
_I
64
120
250
380
'Based on gas pressures of 0 5 psig or less and pressure drop of
0 3 in wg and 0 60 specific gravity gas
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Book|1 |4
PC 101
Catalog No 535-834
PrintedinUSA
Form 58ED.PB-1SI
Pg5
6-85
Replaces. 58PB-1 SI
Jab
l6a 1
8a
For replacement items use Carrier Specified Paris
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