Gas Connections - American Standard TGBWF090A93AVA Installation Manual

3.9 Gas Connections

The following warning complies with the state of California
law, Proposition 65.
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WARNING
!
HARAZDOUS 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.
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!
FIRE OR EXPLOSION HAZARD
NEVER TEST FOR GAS LEAKS WITH AN OPEN
FLAME; A FIRE OR EXPLOSION COULD RESULT.
USE COMMERCIALLY AVAILABLE SOAP SOLU-
TION MADE SPECIFICALLY FOR THE DETEC-
TION OF LEAKS TO CHECK ALL CONNECTIONS.
FAILURE TO FOLLOW THIS WARNING COULD
RESULT IN SERIOUS INJURY, DEATH, OR PRO-
PERTY DAMAGE
This unit is designed for rear installation of
gas piping. The installation of piping shall be
in accordance with piping codes and the regu-
lations of the local gas company. Pipe joint
compound must be used and must be resistant
to the chemical reaction with liquefi ed petro-
leum gasses.
Refer to piping Table 8 for delivery sizes. Connect
gas supply to the unit, using a ground joint union
and a manual shut-off valve as shown in Figure 22.
National codes require a condensation drip leg to be
installed ahead of the controls as shown in Figure 22.
A 1/2" manual shut-off valve is included with boiler.
Install the manual shut-off valve, included with
boiler, 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 access.
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.
Natural Gas Only
Table of cubic feet per hour of gas for various pipe sizes and lengths
Pipe Size
10 20
1/2 132 92
3/4 278 190
1 520 350
1 1/4 1050 730
This table is based on pressure drops of 0.3 inch W.C and 0.06
SP.GR gas
18-CG01D1-4
26
WARNING
Table 8
Length of Pipe
30 40 50 60
73 63 56 50
152 130 115 105
285 245 215 195
590 520 440 400
Figure 22
Use a backup wrench on the gas line when connecting
the small tee, drip leg, union and manual shut off
valve to prevent damage to the gas valve and mani-
fold assembly.
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 23.
Figure 23
Typical
connections
where backup
wrench
should be
used.
NOTE: Maximum pressure to the gas valve for
natural gas is 13.8" W.C. Minumum pressure is 5.0"
W.C. Maximum pressure to the gas valve for pro-
70
pane is 13.8" W.C. Minimum pressure is 11.0" W.C.
46
96
All gas fi ttings must be checked for leaks using a
180
soapy solution before lighting the boiler. DO NOT
370
CHECK WITH AN OPEN FLAME.
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CAUTION
!