User`s manual

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5. Install an accessible, external, manual main shutoff
valve in gas supply pipe within 6 ft of heating section.
6. Install ground-joint union close to heating section
between unit manual shutoff and external manual
main shutoff valve.
7. Pressure-test all gas piping in accordance with local
and national plumbing and gas codes before connect-
ing piping to unit.
8. If thru-the-bottom power connections are used refer
to the accessory installation instructions for informa-
tion on power wiring. Refer to Fig. 3 for drilling holes
in basepan.
NOTE: When pressure testing the gas supply system after
the gas supply piping has been connected to the unit gas
valve, the supply piping must be disconnected from the gas
valve during any pressure testing of the piping systems at
test pressure in excess of 0.5 psig. When pressure testing the
gas supply piping system at test pressures equal to or less
than 0.5 psig, 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.
9. Check for gas leaks at all field- and factory-installed
gas lines after all piping connections have been
completed. Use soap-and-water solution (or method
specified by local codes and/or regulations).
Liquid Propane (LP)
Units are shipped for use with natural gas, but may be field-
converted for use with liquid propane with accessory LP Kit.
All LP gas equipment must conform to NFPA safety
standards.
The LP gas pressure at the unit must be between 5.0 in. wg
and 13.0 in. wg under full load. Maintaining proper gas pres-
sure depends on:
1. Vaporization rate. (Vaporization rate is determined
by the temperature of the LP and the level of LP in
the tank.)
2. Proper pressure regulation. (Two-stage regulation is
more cost effective and more efficient than single-
stage regulation.)
3. Pressure drop in lines between regulators and
between the second-stage regulator and the appli-
ance. Pipe size is determined by the length of the pipe
run and the total load of all appliances.
CAUTION: Unstable operation may occur when
the gas valve and manifold assembly are forced out of
position while connecting improperly routed rigid gas
piping to the gas valve. Use a backup wrench when
making connection to avoid strain on, or distortion of,
the gas control piping.
CAUTION: If a flexible conductor is required or
allowed by the authority having jurisdiction, black iron
pipe shall be installed at the gas valve and extend a
minimum of 9 in. outside the unit casing.
DANGER: never use a match or other open flame
when checking for gas leaks. Never purge gas line into
combustion chamber. Failure to adhere to this warning
could result in an explosion causing personal injury or
death.
LEGEND NOTE:
Follow all local codes.
NFGC —
National Fuel Gas Code
*Field supplied.
Fig. 10 — Gas Piping Guide
(With Accessory Utility Connection Package)
STEEL PIPE
NOMINAL
DIAMETER
(in.)
SPACING OF SUPPORTS
X DIMENSIONS
(ft)
1
/
2
3
/
4
or 1
1
1
/
4
or Larger
6
8
10
Fig. 11 — Sediment Trap