Page 22
Gas Connection
Note - Install protective bushing (provided in bag as-
sembly) before making gas connections.
When connecting gas supply, the length of the run from
the meter must be considered in determining the pipe size
to avoid excessive pressure drop. A line pressure of 7”
w.g. (178mm w.g.) for natural gas should be maintained
when sizing piping. For correct sizing of piping, consult the
utility having jurisdiction.
A drip leg should be installed in the vertical pipe run to the
unit. In some localities, codes may require that a manual
main shuto valve and union (furnished by installer) be
installed external to the unit. Union must be of the ground
joint type. A drip leg should be readily accessible to per-
mit cleaning and emptying. See gure 12.
NOTE - If a switch box is mounted over electrical knock-
outs on back of unit, leave a minimum of 4” (102mm)
clearance between switch box and drip leg.
A 1/8” NPT plugged tap shall be installed immediately up-
stream of the gas supply connection to the heater.
NOTE - Compounds used on threaded joints of gas pip-
ing must be resistant to the actions of liquefied petroleum
gases.
GROUND
JOINT UNION
DRIP LEG
MANUAL
MAIN SHUT-OFF VALVE
(Furnished by Installer)
GAS FLOW
1/8 NPT
PLUGGED TAP
FIGURE 12
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