17
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. 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 Water Heaters representative to resolve the
problem.
Table 8 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 8 should be used
in conjunction with Table 9 to ensure that the gas supply
piping has the capacity to meet the demand.
Figure 17 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 feet 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.
Table 8 – Gas Pipe Capacity
Note: Multiply the gas volume by 0.62 for propane flow capacity in ft3/hr.
Multiply the propane flow capacity by 2500 Btu/ft3 to determine
the propane Btu/hr capacity for a given pipe size and length.
Table 9 – Equivalent Pipe Length Chart
Figure 17 – Gas Supply Piping
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 Clock
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.
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.
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 flame 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!
Whenever the gas supply piping is pressure tested the
boiler/water heater gas controls must be protected. If the
test pressure is equal to, or less than 1/2 psig (3.5 kPa)
isolate the boiler/water heater by closing it’s manual shut
off valve, see Figure 16. If the test pressure is greater than,
or equal to 1/2 psig (3.5 kPa), disconnect the boiler/water
heater and its individual shut-off valve.
ELECTRICAL WIRING
CAUTION
Label all wires prior to disconnection when servicing
controls. Wiring errors can cause improper and
dangerous operation! Verify proper operation after
servicing.
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)
