Carrier WeatherMaster 48HC14 Installation Instructions Manual page 15

9" (229mm) min
Thru-Curb Adapter
Shut Off
Valve
Drip
Leg
Fig. 21 — Gas Piping
Burner
Access
Panel
Thru-Curb Adapter
Shut Off
Valve
Fig. 22 — Gas Piping
Fig. 23 — Gas Piping Thru-Base Connections
Union
Unit Base Rail
9" (229mm) min
Union
Unit Base Rail
Drip
Leg
When installing the gas supply line, observe local codes
pertaining to gas pipe installations. Refer to the NFPA 54/
ANSI Z223.1 NFGC latest edition (in Canada, CAN/CSA
B149.1). In the absence of local building codes, adhere to the
following pertinent recommendations:
1. Avoid low spots in long runs of pipe. Grade all pipe
inch in every 15 ft (7 mm in every 5 m) to prevent traps.
Grade all horizontal runs downward to risers. Use risers
to connect to heating section and to meter.
2. Protect all segments of piping system against physical
and thermal damage. Support all piping with appropriate
straps, hangers, etc. Use a minimum of one hanger every
6 ft (1.8 m). For pipe sizes larger than
ommendations of national codes.
3. Apply joint compound (pipe dope) sparingly and only to
male threads of joint when making pipe connections. Use
only pipe dope that is resistant to action of liquefied pe-
troleum gases as specified by local and/or national codes.
If using PTFE (Teflon*) tape, ensure the material is Dou-
ble Density type and is labeled for use on gas lines. Apply
tape per manufacturer's instructions.
4. Pressure-test all gas piping in accordance with local and
national plumbing and gas codes before connecting pip-
ing to unit.
NOTE: Pressure test the gas supply system after the gas supply
piping is connected to the gas valve. The supply piping must
be disconnected from the gas valve during the testing of the
piping systems when test pressure is in excess of 0.5 psig
(3450 Pa). Pressure test the gas supply piping system at pres-
sures equal to or less than 0.5 psig (3450 Pa). The unit heating
section must be isolated from the gas piping system by closing
the external main manual shutoff valve and slightly opening
the ground-joint union.
Check for gas leaks at the field-installed and factory-in-
stalled gas lines after all piping connections have been com-
pleted. Use soap-and-water solution (or method specified by
local codes and/or regulations).
FIRE OR EXPLOSION HAZARD
Failure to follow this warning could result in personal
injury, death and/or property damage.
• Connect gas pipe to unit using a backup wrench to
avoid damaging gas controls.
• Never purge a gas line into a combustion chamber.
• Never test for gas leaks with an open flame. Use a
commercially available soap solution made specifi-
cally for the detection of leaks to check all connec-
tions.
• Use proper length of pipe to avoid stress on gas con-
trol manifold.
NOTE: If orifice hole appears damaged or it is suspected to
have been re-drilled, check orifice hole with a numbered drill
bit of correct size. Never re-drill an orifice. A burr-free and
squarely aligned orifice hole is essential for proper flame char-
acteristics. See Fig. 24.
* Teflon is a registered trademark of DuPont.
15
/ -in., follow rec-
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WARNING
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