Gas Supply Piping - RBI FUTERA II Series Installation And Operation Instructions Manual

FUTERA II INSTALLATION AND OPERATION INSTRUCTIONS

GAS SUPPLY PIPING

WARNING: Check the boiler/water heater rating
plate to make sure that the boiler/water heater is
for the type of gas that will be used. If it isn't, do
not connect the boiler/water heater to the gas
supply. Gas supply piping must be in accordance
with the National Fuel Code, ANSI Z223.1-latest
revision or applicable provisions of the local
building codes. Canadian installations must
comply with CAN/CGA B149.1 or .2 Installation
Code. Failure to comply with this warning can
result in extensive property damage, severe
personal injury or death!
The Futera II comes from the factory ready to be piped to
the gas supply. If for any reason the boiler/water heater is
not for the type of gas available at the installation site, call
your RBI representative to resolve the problem.
NOTE: A minimum gas supply pressure of 6 in, 152 mm
W.C. natural or 11 in, 279 mm W.C. propane and
maximum 14 in, 356 mm W.C. natural or propane, must
be available at the safety shutoff valve inlet with the
unit(s) operating.
Table 6 should be used to ensure that the gas supply piping
is sized properly. If more than one appliance is supplied
by the same supply pipe, the piping must be sized based
on the maximum possible demand. Do not neglect the
pressure drop due to pipe fi ttings. Table 6 should be used
in conjunction with Table 7 to ensure that the gas supply
piping has the capacity to meet the demand.
Figure 18 depicts the proper way to connect the boiler/
water heater to the gas supply piping. The manual shut-
off valve MUST be installed in the supply piping. It should
be installed 5 ft, 1.5 m above the fl oor where required by
local codes. Provide a sediment trap at the bottom of the
vertical section of the gas supply pipe upstream of the gas
controls.
A ground joint union should be installed between the boiler
gas controls and the supply piping. Each of these items
are needed to ensure long life and ease of servicing.
Always use a pipe sealant that is suitable for use with LP
gas.
Table 6 – Gas Pipe Capacity
Maximum pipe capacity in ft 3 /hr based on 0.60 specifi c gravity gas
at a pressure of 0.5 psig or less and a 0.3" W.C. pressure drop.
Nominal
Iron Pipe 10 20 30
Size, (in) Maximum gas volume of pipe, (ft
520 285
1" 350
1 1/4" 1050 730 590
890
1 1/2" 1600 1100
3050 1650
2" 2100
Note: Multiply the gas volume by 0.62 for propane fl ow capacity in ft
Multiply the propane fl ow capacity by 2500 Btu/ft
the propane Btu/hr capacity for a given pipe size and length.
Pipe length in feet
100
40 50 60 80
3 /hr)
245 215 195 170 150
305
500 440 400 350
760 460
670 610 530
1270 1270 1150 990 870
3
to determine
Table 7 – Equivalent Pipe Length Chart
Nominal
90˚ Elbow
Iron Pipe
Size, (in)
1" 2.6
1 1/4" 3.5
1 1/2" 4.0
2" 5.2
Notes: 1. For fl ow through branch.
2. For fl ow at full open.
Figure 18 – Gas Supply Piping
CAUTION: Always use a wrench on the gas valve body
when making gas connections to it. Never over-tighten
the piping entering the gas valve body or gas valve
failure may result!
When applicable, provisions for vent, bleed and gas relief
lines must be made in accordance with the latest revision
of ANSI Z223.1/NFPA 54.
Safe lighting and other performance criteria were met with
the gas manifold and control assembly provided on the
boiler. All gas connections MUST be leak tested before
putting the boiler into operation.
WARNING: Never use an open fl ame to test for gas
leaks. Always use an approved leak detection
method. Failure to comply with this warning can
cause extensive property damage, severe personal
injury or death!
150
Whenever the gas supply piping is pressure tested the
120
boiler/water heater gas controls must be protected. If the
250
test pressure is equal to, or less than 1/2 psig, 3.5 kPa
380
isolate the boiler/water heater by closing it's manual shut
710
off valve, see Figure 18. If the test pressure is greater than,
3 /hr.
or equal to 1/2 psig, 3.5 kPa, disconnect the boiler/water
heater and its individual shut-off valve.
24
Type of pipe fi tting
Tee 1 Gate Valve 2 Gas Cock
Equivalent pipe length, (ft)
5.2 0.6
6.9 0.8
8.0 0.9
10.3 1.2
2
1.5
1.9
2.3
3.0