Raypak XPAK 85 - Manual (Page 22)

22
NOTICE: When installing the gas supply connection, it must
comply with local regulations or, if such regulations do not exist,
with the National Fuel Gas Code, ANSI Z 223.1.
In Canada, the gas supply connection must comply with local
regulations or, if such regulations do not exist, with CAN/CSA
B149, Natural Gas and Propane Installation Code. A sediment
trap must be provided upstream of the gas controls.
Length of Gas Volume Capacity
pipe (feet) (ft 3 /h) *
3/4” 1” 1 1/4” 1 1/2”
10 278 520 1,060 1,600
20 190 350 730 1,100
30 152 285 590 890
40 130 245 500 760
50 115 215 440 670
75 93 175 360 545
100 79 160 305 480
150 64 120 250 380
* Maximum pipe capacity in ft 3 /hr, based on a specific gravity of 60 (42
mbar) and a inlet gas pressure of 14 inches W.C. (35 mbar) or less and a
pressure drop of 0.3 inches W.C. (20 mbar)
Steel pipe Equivalent length for Pipe Fittings in feet
diameter Type of pipe fitting
in inches 90° Elbow Tee Gate valve Gas cocks
(flow thru
branch)
Equivalent length in feet
3/4 2.1 4.1 0.5 1.25
1 2.6 5.2 0.6 1.60
1 1/4 3.5 6.9 0.8 2.15
1 1/2 4.0 8.0 0.9 2.50
Equivalent length for pipe fittings in feet
Fig. 13
Fig. 14
Open
position
MAKING THE GAS CONNECTION
DANGER: Only carry out work on gas conduits and fittings if
you are licensed for such work.
- Determine proper size gas pipe for the installation using
Table 3 and Table 4. Do not forget the pipe fitting losses
and observe proper size of the fittings.
- Install the furnished 3/4” female gas cock on the gas
connection (3/4” male on the boiler) (Fig. 13).
- Connect the gas pipe to the gas cock so that it is free from
any strain.
Tab. 3 Gas Pipe Capacity for different pipe sizes
Tab. 4
NOTICE: The boiler must be isolated from the gas supply
piping system by closing its individual manual shutoff valve
during any pressure testing of the gas supply piping system at
test pressures equal to or less than 1/2 psi (3.5 kPa).
CAUTION: The boiler and its individual shutoff valve must
be disconnected from the gas supply piping system during
any pressure testing of that system at test pressures in excess
of 1/2 psi (3.5 kPa).
A- Manual main gas shutoff
valve (supplied)
B- Coupling (field supplied)
C- To gas supply
A
B
C
Closed
position