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8' (2.4 m)
OR LESS
2' MIN
(0.6 m)
VENT PIPE
DRAFTHOOD
HEATER
Figure 11. Venting Clearances
NOTE: With venting application of two or more heaters,
contact the factory.
Gas Supply Connections
MANUAL SHUTOFF VALVE
(Field-supplied)
GAS INLET
FINISH FLANGE
" MIN
3
(76 mm)
UNION
Typical
(Field-supplied)
SEDIMENT TRAP
(Field-supplied)
Figure 12. Gas Supply Plumbing
14
Gas piping must have a sediment trap ahead of the
heater gas controls, and a manual shutoff valve located
outside the heater jacket. All gas piping should be tested
VENT CAP
after installation in accordance with local codes.
2' MIN
(0.6 m)
5' MIN
(1.5 m)
Supply Pressure
A minimum of 6 in. WC and a maximum of 10.5 in. WC
upstream pressure under load and no-load conditions
must be provided for natural gas. A minimum of 12 in. WC
and a maximum of 13 in. WC are required for propane
gas under load and no-load conditions.
Gas Pressure Regulator
The gas pressure regulator is preset at 4.0 in. WC
for natural gas, and 10.5 in. WC for propane gas. The
pressure at the gas valve, taken with a manometer, should
be about 4.0 in. WC natural gas and 10.5 in. WC propane
gas. If an adjustment is needed, remove seal and turn
adjustment screw clockwise
counter-clockwise
HEATER JACKET
GAS VALVE
Figure 13. Manual Shutoff Valve Installation
A
CAUTION: The heater and its manual shutoff valve
must be disconnected from the gas supply during any
pressure testing of that system at test pressures in
excess of 1/2 psi (3.45 kPa). Dissipate test pressure in
the gas supply line before reconnecting the heater and
its manual shut off valve to gas supply line. FAILURE
TO FOLLOW THIS PROCEDURE MAY DAMAGE THE
GAS VALVE. OVER-PRESSURIZED GAS VALVES ARE
NOT COVERED BY WARRANTY. The heater and its gas
connections shall be leak tested before placing the
appliance in operation. Use soapy water for leak test. DO
NOT use open flame.
A
CAUTION: Do not use Teflon tape on gas line pipe
thread. Only sealant tape or a pipe compound rated for
use with natural and propane gases is recommended.
Apply sparingly only on male pipe ends, leaving the two
end threads bare.
to decrease pressure.
MANUAL
SHUTOFF
VALVE
UNION
to increase pressure or
F10640-5
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