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Burner
Access
Panel
Thru-Curb Adapter
Shut Off
Valve
Fig. 19 — Gas Piping, Typical Curb Sidewall Piping
(Example 2)
Fig. 20 — Gas Piping, Typical Thru-Base Connections
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:
• Avoid low spots in long runs of pipe. Grade all pipe
1
/
in. per every 15 ft (7 mm per every 5 m) to prevent
4
traps. Grade all horizontal runs downward to risers. Use
risers to connect to heating section and to meter.
• 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.
• 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
petroleum gases as specified by local and/or national
codes. If using PTFE (Teflon
is Double Density type and is labeled for use on gas
lines. Apply tape per manufacturer's instructions.
• 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
1. Teflon is a registered trademark of DuPont.
9" (229mm) min
Union
Unit Base Rail
Drip
Leg
1
/
in., follow rec-
2
1
) tape, ensure the material
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 pressures 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).
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 specifically
for the detection of leaks to check all connections.
• Use proper length of pipe to avoid stress on gas control
manifold.
NOTE: If orifice hole appears damaged or it is suspected to
have been redrilled, check orifice hole with a numbered drill bit
of correct size. Never redrill an orifice. A burr-free and square-
ly aligned orifice hole is essential for proper flame characteris-
tics. See Fig. 21.
Fig. 21 — Orifice Hole
Step 12 — Install External Condensate Trap and
Line
The unit has one
3
/
4
the end of the condensate pan and an alternate connection
on the bottom. See Fig. 22. Unit airflow configuration does
not determine which drain connection to use. Either drain
connection can be used with vertical or horizontal applica-
tions.
When using the standard side drain connection, ensure
the red plug in the alternate bottom connection is tight. Do
this before setting the unit in place. The red drain pan can be
tightened with a
1
/
-in. square socket drive extension.
2
To use the alternate bottom drain connection, remove the
red drain plug from the bottom connection (use a
square socket drive extension) and install it in the side drain
connection.
14
WARNING
BURNER
ORIFICE
-in. condensate drain connection on
1
/
-in.
2
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