Carrier 58SX040-IBC - Manual (Page 2)

Special Locations— When installing furnace in a residential
garage, protect it from physical damage by vehicles. Fur­
naces installed in public garages, airplane hangers, or other
buildings having hazardous atmospheres must comply with
requirements of the National Fire Protection Association,
Inc.
GAS PIPING
Gas piping must be installed in accordance with national
and local codes.
Run a separate gas supply hue directly from the meter to
the furnace, if possible. Table 1 shows recommended gas
pipe sizing. Slope all pipe 1/4 inch in 15 ft to prevent traps.
Slope aU horizontal runs away from meter and toward
risers. Use risers to connect lines to furnace and meter.
Apply joint compounds (pipe dope) sparingly and only to
male threads of joints. Consult local gas supplier for com­
pound recommendations.
NOTE: Use only compounds resistant to the action of LP
(propane) gas.
Install a sediment trap in the riser leading to the furnace to
trap dirt and condensate. Connect a tee to the riser leading
to the furnace, keeping straight-through section of tee verti­
cal. Connect a capped nipple into lower end of tee, so that
nipple extends below level of gas controls (Fig. 1).
Where a gum filter is required by local codes, install it in
accordance with their requirements.
An accessible manual shutoff valve must be installed
upstream of furnace gas controls and within 6 ft of furnace.
A 1/8-in. NPT plugged tapping, accessible for test-gage con­
nection, must also be installed immediately upstream of gas
supply connection to furnace and downstreeun of manual
shutoff valve.
Install a ground joint imion between gas control manifold
and manual gas shutoff valve (Fig. 1).
A CAUTION
Use a backup wrench when connecting gas pipe to fur­
nace to avoid damaging gas controls.
MANUAL
SHUTOFF
VALVE
A84218
Fig. 1—Ground Joint Union and Sediment Trap
sizes larger than 1/2 in., foUow recommendations of national
codes.
A CAUTION
If a flexible connector is required or allowed by the
authority having jurisdiction, black iron pipe must be
installed at the gas valve and extend a minimum of 2 in.
outside the furnace casing.
Pressvue-test piping in accordance with local and national
plumbing and gas codes before attaching furnace. Crack
ground joint union before pressure testing. If pressure
exceeds 0.5 psig (14 in. wc), disconnect gas supply Une from
furnace before performing pressure test. If test pressure is
equal to or less than 0.5 psig (14 in. wc), close manual shut­
off valve located on gas valve before testing.
After final connection to the furnace has been made, purge
lines and check for leakage with regulated gas supply
pressure.
A WARNING
Use the proper length of pipes to avoid stress on the
gas control manifold. A failure to adhere to this warn­
ing can cause a gas leak resulting in a fire, explosion,
physical injury, or death.
Protect all segments of the piping system agEunst physical
and thermal damage. Support aU piping with appropriate
straps or hangers (one hanger every 6 ft rninimum). For pipe
Table 1—Maximum Capacity of Pipe*
NOMINAL
IRON PIPE
SIZE (in.)
INTERNAL
DIAMETER
(in.)
LENGTH OFPiPE(ft)
10 20 30 40 50
1/2 0.622 175 120 97 82 73
3/4 0.824 360 250 200 170 151
1 1.049 680 465 375 320 285
1-1/4 1.380 1400 950 770 660 580
1-1/2 1.610 2100 1460 1180 990 900
Ref: Table C-4 NFPA 54-1984
♦Cubic ft of gas per hour, for gas pressures of 0.5 psig (14 in. wc) or less,
and a pressure drop of 0.5 in. wc (based on a 0.60 specific gravity gas).
A WARNING
Never purge line into combustion chamber. Never use
matches, candles, flame, or other sources of ignition to
check for gas leakage. Use a soap-and-water solution to
check for leaks. A failure to adhere to this warning can
cause a fire, explosion, physical injtuy, or death.
COMBUSTION-AIR AND VENT PIPING
The combustion-air and vent pipe and fittings must con­
form to American National Standards Institute (ANSI)
standards and American Society for Testing and Materials
(ASTM) standards D1785 (schedule-40 PVC), D2665 (PVC-
DWV), D2441 (SDR-21 and SDR-26 PVC) or D2661 (ABS-
DWV). Pipe cement and primer must conform to ASTM
standards D2564 (PVC) or D2235 (ABS). See Table 3 for
pipe sizing and Fig. 3 through 5 for exterior piping arrange­
ments. See “High-Altitude Pipe Sizing Procedures” section
for high-altitude applications.
The unit is shipped with a 2-1/2 x 2-1/2-in. rubber coupling.
An optional coupling size 2-1/2 x 2-in. is available through
the Distributor or Branch. See the Replacement Parts cata­
log for the part number.
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