Gas Supply Piping - RBI FUTERA III Series HeatNet Installation & Operation Manual

FUTERA III 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 III 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 2 in, 51 mm,
W.C. natural or 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 9 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 9 should be used
in conjunction with Table 10 to ensure that the gas supply
piping has the capacity to meet the demand.
Figure 14 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.
Figure 14 – Gas Supply Piping
Table 9 – Gas Pipe Capacity
Maximum pipe capacity in ft
at a pressure of 0.5 psig or less and a 0.3" WC pressure drop.
Nominal
Iron Pipe 10
20
Size, (in) Maximum gas volume of pipe, (ft
1" 520 350
1050
1 1/4" 730
1 1/2" 1600 1100
1650
2" 3050 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.
Table 10 – 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.
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. The main Dungs gas valve supplied
with boiler/water heater does not require external venting.
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.
21
3
/hr based on 0.60 specifi c gravity gas
Pipe length in feet
30 40 50 60 80
3 /hr)
285 245
215 195 170
590 500 440 400 350
890 760 670 610 530
1270
1270 1150 990
3 to determine
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
100 150
150
120
305 250
460 380
870
710
3 /hr.
2
1.5
1.9
2.3
3.0