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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
per every 15 ft (7 mm per every 5 m) to prevent 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
recommendations 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 pe-
troleum gases as specified by local and/or national codes.
If using PTFE (Teflon
1
ble Density type and is labeled for use on gas lines. Ap-
ply 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
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).
WARNING
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 squarely
aligned orifice hole is essential for proper flame characteristics.
See Fig. 22.
1. Teflon is a registered trademark of DuPont.
/
in., follow
1
2
) tape, ensure the material is Dou-
1
/
in.
4
Step 12 — Install External Condensate Trap
The unit has one
end of the condensate pan and an alternate connection on the
bottom. See Fig. 23. Unit airflow configuration does not de-
termine which drain connection to use. Either drain connec-
tion can be used with vertical or horizontal applications.
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
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.
The piping for the condensate drain and external trap can
be completed after the unit is in place. See Fig. 24.
CONDENSATE PAN (SIDE VIEW)
STANDARD
SIDE DRAIN
Fig. 23 — Condensate Drain Pan (Side View)
15
BURNER
ORIFICE
Fig. 22 — Orifice Hole
and Line
3
/
-in. condensate drain connection on the
4
/
-in. square socket drive extension.
1
2
DRAIN
PLUG
(FACTORY-INSTALLED)
/
-in.
1
2
ALTERNATE
BOTTOM DRAIN
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