13
CONNECTING GAS SERVICE
Connect gas service from meter to control assembly in
1.
accordance with ANSI Z223.1 and local codes or utility.
A ground joint union should be installed for easy removal
of gas control for servicing. A drip leg or trap must be
installed at the bottom of a vertical section of piping at the
inlet to the boiler. A pipe compound resistant to the action
of liquied petroleum gases must be used on all threaded
pipe connections. Check with the local utility for location
of manual shutoff valve if required. See
gure #11
.
The gas line should be of adequate size to prevent undue
2.
pressure drop and never smaller than the pipe size of the
main gas control valve. See chart below.
Maximum Capacity of Pipe in Cubic Feet of
Gas Per Hour
(Gas pressure = 0.5 psig or less,
pre sure drop = .5 in.w/c)
Nomi-
nal Iron
Pipe
Size
Length of Pipe (Feet)
10' 20' 30' 40' 60' 80' 100'
½" 175 120 97 82 66 57 50
¾" 360 250 200 170 138 118 103
1" 680 465 375 320 260 220 195
1¼" 1400 950 770 660 530 460 400
For additional information refer to the National Fuel
Gas Code Handbook, Latest Revision.
DO NOT USE AN OPEN FLAME.
WARNING
!
To check for leaks in gas piping, use a soap and water
3.
solution or other approved method.
Disconnect the boiler from the gas supply piping system
4.
during any pressure testing of the gas piping. After recon-
necting, leak test the gas connection and boiler piping
before placing the boiler back into operation.
PRESSURE
GAS
NATURAL PROPANE
MIN. SUPPLY 5" w.c. 11" w.c.
MAX. SUPPLY 14" w.c. 14" w.c.
MANIFOLD 3.5" w.c. 10.5" w.c.
Figure #11
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