RBI DOMINATOR Series User Manual

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GAS SUPPLY PIPING
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!
 e Dominator 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.
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 shuto 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   ings. 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 16 depicts the proper way to connect the boiler/ water heater
to the gas supply piping.  e manual shut-o valve must be installed
in the supply piping. It should be installed 5  , 1.5 m above the  oor
where required by local codes. Provide a sediment trap at the bo om
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 9 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" WC pressure drop.
Nominal
Iron Pipe
Size, (in)
Pipe length in feet
10 20 30 40 50 60 80 100 150
Maximum gas volume of pipe, (ft
3
/hr)
1" 520 350 285 245 215 195 170 150 120
1 1/4" 1050 730 590 500 440 400 350 305 250
1 1/2" 1600 1100 890 760 670 610 530 460 380
2" 3050 2100 1650 1450 1270 1150 990 870 710
2 1/2" 4800 3300 2700 2300 2000 1850 1600 1400 1130
3" 8500 5900 4700 4100 3600 3250 2800 2500 2000
Note: Multiply the gas volume by 0.62 for propane fl ow capacity in ft
3
/hr.
Multiply the propane fl ow capacity by 2500 Btu/ft
3
to determine
the propane Btu/hr capacity for a given pipe size and length.
Table 10 Equivalent Pipe Length Chart
Nominal
Iron Pipe
Size, (in)
Type of pipe fi tting
90˚ Elbow Tee
1
Gate Valve
2
Gas Cock
2
Equivalent pipe length, (ft)
1" 2.6 5.2 0.6 1.5
1 1/4" 3.5 6.9 0.8 1.9
1 1/2" 4.0 8.0 0.9 2.3
2" 5.2 10.3 1.2 3.0
2 1/2" 6.2 12.3 1.4 3.7
3" 7.7 15.3 1.8 4.5
Notes: 1. For fl ow through branch.
2. For fl ow at full open.
Always use a square jawed 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!
Figure 16 Gas Supply Piping
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 pu ing the boiler into
operation.
Never use an open  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!
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 o 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-o valve.

RBI DOMINATOR Series Specifications

General

Category	Boiler
Brand	RBI
Series	DOMINATOR
Fuel Type	Gas
Configuration	Floor-standing
Water Content	Varies by model
Dimensions	Varies by model
Weight	Varies by model