Gas Supply Connections - American Standard GRWF130A94A0A Installation Manual

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WARNING
!
HAZARDOUS GAS WARNING
EXPOSURE TO FUEL SUBSTANCES OR BY-PRO-
DUCTS OF INCOMPLETE FUEL COMBUSTION IS
BELIEVED BY THE STATE OF CALIFORNIA TO
CAUSE CANCER, BIRTH DEFECTS OR OTHER
REPRODUCTIVE HARM.
▲
!
FIRE OR EXPLOSION HAZARD
FAILURE TO FOLLOW THIS WARNING COULD
RESULT IN SERIOUS INJURY, DEATH, OR PRO-
PERTY DAMAGE.
NEVER TEST FOR GAS LEAKS WITH AN OPEN
FLAME. USE COMMERCIALLY AVAILABLE
SOAP SOLUTION MADE SPECIFICALLY FOR
THE DETECTION OF LEAKS TO CHECK ALL
CONNECTIONS. A FIRE OR EXPLOSION MAY
RESULT CAUSING PROPERTY DAMAGE, PERSO-
NAL INJURY, OR LOSS OF LIFE

3.7 Gas Supply Connections

This unit is set up for rear installation of gas piping.
The installation of piping shall be in accordance
with piping codes and the regulations of the local gas
company. Pipe joint compound must be resistant to
the chemical reaction with liquifi ed petroleum and
natural gases.
Refer to piping Table 8 for delivery sizes. Conneect
gas supply to the unit, using a ground joint union
and a manual shut-off valve as shown in Figure 15.
A 1/2" manual shut-off valve is included with boiler
and must be installed in the supply gas line.
Install the manual shut-off valve in plain sight and
in an accessible location within close proximity to the
boiler. The valve can be installed on either the right
side, left side or rear of the boiler. When the shut off
valve is installed in the rear of the boiler, locate the
valve above the boiler for easy visibility and access.
National codes require a condensate drip leg to be
installed ahead of the controls as shown in Figure 15.
The boiler must be isolated from the gas supply
piping by closing its individual manual shut-off valve
during any pressure testing of that system at test
pressure in excess of 1/2 psig.
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CAUTION
!
Use a backup wrench on the gas line when connec-
ting the Tee, dripleg, union and manual shut off
valve to prevent damage to the gas valve and mani-
fold assembly. Tee, drip leg, and union are supplied
by the installer.
Use a backup wrench on the gas line when connecting
or removing pipes or fi ttings to or from the boiler gas
lines. Note the attachment points in Figure 16.
18-CG02D1-4
22
WARNING
.
Figure 15
(FACTORY
SUPPLIED)
TEE
Natural Gas Only
Table of cubic feet per hour of gas for various pipe sizes and lengths
Pipe
Size
10 20 30
1/2 132 92 73
3/4 278 190 152
1 520 350 285
1 1/4 1050 730 590
This table is based on pressure drops of 0.3 inch W.C and 0.06 SP.GR gas
Figure 16
Typical
connections
where backup
wrench
should be
used.
Natural Gas Supply Pressures: Maximum pressure
to the gas valve for natural gas is 13.8" W.C. Minu-
mum pressure is 5.0" W.C.
Liquid Propane Gas Supply Pressures: Maximum
pressure to the gas valve for propane is 13.8" W.C.
Minimum pressure is 11.0" W.C.
Table 8
Length of Pipe
40 50 60
63 56 50
130 115 105
245 215 195
520 440 400
70
46
96
180
370