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Gas Supply Connection
The heater must be isolated from the gas supply pip-
ing system by closing the manual shut-off valve during
any pressure testing of the gas supply piping system
at test pressures equal to or less than 1/2 psi (3.45
kPa). Relieve test pressure in the gas supply line prior
to reconnecting the heater and its manual shut-off
valve to the gas supply line. FAILURE TO FOLLOW
THIS PROCEDURE MAY DAMAGE THE GAS
VALVES. Over pressurized gas valves are not cov-
ered 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
an open flame.
CAUTION: The heater must be disconnected from
the gas supply during any pressure testing of the gas
supply system at test pressures in excess of 1/2 psi
(3.45 kPa).
Fig. 14: Gas Supply Connection
CAUTION: Do not use Teflon tape on gas line pipe
thread. 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.
Table I: Maximum Equivalent Pipe Length
Natural gas – 1,000 BTU per ft
3
, .60 specific gravity at 0.5 in. WC pressure drop
Propane gas – 2,500 BTU per ft
3
, 1.53 specific gravity at 0.6 in. WC pressure drop
Model
No.
3/4” 1” 1-1/4” 1-1/2” 2” 2-1/2” 3” 4”
N P N P N P N P N P N P N P N P
399B 15 25 60 100 260 250
499B 65 150 130 360 500
649B 45 100 95 250 340
749B 35 80 75 180 260 600
899B 20 45 45 110 150 360 400
989B 120 300 300
1259B 75 180 170 325 560
1529B 50 120 125 250 400
1799B 40 100 100 225 340
1999B 30 80 75 175 260
2069B 30 80 75 175 260
2339B 20 55 55 135 160 400 600
regulator must be installed to reduce the gas supply
pressure to a maximum of 10.5 in. WC for natural gas
and 13.0 in. WC for propane gas. The regulator should
be placed a minimum distance of 10 times the pipe
diameter up-stream of the heater gas controls. Refer
to Table I for maximum pipe lengths.