21
FUTERA III INSTALLATION AND OPERATION INSTRUCTIONS
Table 9 – Gas Pipe Capacity
Table 10 – Equivalent Pipe Length Chart
Figure 14 – 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.
Note: Multiply the gas volume by 0.62 for propane flow capacity in ft
3
/hr.
Multiply the propane flow capacity by 2500 Btu/ft
3
to determine
the propane Btu/hr capacity for a given pipe size and length.
1"
1 1/4"
1 1/2"
2"
Type of pipe fitting
Equivalent pipe length, (ft)
90˚ Elbow
2.6
3.5
4.0
5.2
Tee
1
5.2
6.9
8.0
10.3
Gate Valve
2
0.6
0.8
0.9
1.2
Gas Cock
2
1.5
1.9
2.3
3.0
Nominal
Iron Pipe
Size, (in)
Notes:
1. For flow through branch.
2. For flow at full open.
Nominal
Iron Pipe
Size, (in)
10
520
1050
1600
3050
20
350
730
1100
2100
30
285
590
890
1650
40
245
500
760
1270
50
215
440
670
1270
60
195
400
610
1150
80
170
350
530
990
100
150
305
460
870
Maximum pipe capacity in ft
3
/hr based on 0.60 specific gravity gas
at a pressure of 0.5 psig or less and a 0.3" WC pressure drop.
150
120
250
380
710
Pipe length in feet
1"
1 1/4"
1 1/2"
2"
Maximum gas volume of pipe, (ft
3
/hr)
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 fittings. 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 floor 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.
