19
Gas Supply Connection
The heater must be isolated from the gas supply
piping 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
covered by warranty. The heater and its gas connec-
tions 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.
APPROVED
UNCONTROLLED DOCUMENT IF PRINTED
