13
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 shutoff 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.
Supply Pressure
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.
A minimum of 5 in. WC and a maximum of 10.5 in. WC
upstream pressure under load and no-load conditions
must be provided for natural gas.
Gas Pressure Regulator
The gas pressure regulator is preset at 3.1 in. WC for
natural gas. The pressure at the gas valve, taken with a
manometer, should be about 3.1 in. WC natural gas. If an
adjustment is needed, remove seal and turn adjustment
screw clockwise
to increase pressure or counter-
clockwise
to decrease pressure.
MANUAL
SHUTOFF
VALVE
UNION
F10639-4
Figure 13. Manual Shutoff Valve Installation
VENT CAP
2' MIN
(0.6 m)
VENT PIPE
DRAFT HOOD
5' MIN
(1.5 m)
HEATER
2' MIN
(0.6 m)
8' (2.4 m)
OR LESS
Figure 11. Venting Clearances
NOTE:
With venting application of two or more heaters,
contact the factory.
Gas Supply Connections
GAS INLET
HEATER JACKET
MANUAL
SHUTOFF
VALVE
(Field-supplied)
GAS VALVE
FINISH FLANGE
UNION
(Field-supplied)
SEDIMENT TRAP
(Field-supplied)
3" MIN
(76 mm)
Typical
Figure 12. Gas Supply Plumbing
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
after installation in accordance with local codes.
