RBI Dominator Series Operations Instructions download pdf (Page 22)

DOMINATOR INSTALLATION AND OPERATION INSTRUCTIONSPage 22

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 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.

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 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 16 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 9 - Gas Pipe Capacity

Table 10 - Equivalent Pipe Length Chart

CAUTION: 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 putting the boiler into operation.

Pipe length in feet

10 20 30 40 50 60 80 100 150

Maximum gas volume of pipe, (ft

/hr)

520 350 285 245 215 195 170 150 120

1050 730 590 500 440 400 350 305 250

1600 1100 890 760 670 610 530 460 380

3050 2100 1650 1450 1270 1150 990 870 710

4800 3300 2700 2300 2000 1850 1600 1400 1130

8500 5900 4700 4100 3600 3250 2800 2500 2000

Maximum pipe capacity in ft

/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

Size, (in)

1ʺ

2ʺ

3ʺ

Notes: 1. For ﬂ ow through branch.

2. For ﬂ ow at full open.

Type of pipe ﬁ tting

90° Elbow Tee

Gas Valve

Gas Cock

Equivalent pipe length, (ft)

2.6 5.2 0.6 1.5

3.5 6.9 0.8 1.9

4.0 8.0 0.9 2.3

5.2 10.3 1.2 3.0

6.2 12.3 1.4 3.7

7.7 15.3 1.8 4.5

Nominal

Iron Pipe

Size, (in)

1ʺ

2ʺ

3ʺ

Note: Multiply the gas volume by 0.62 for propane ﬂ ow capacity in ft

/hr.

Multiply the propane ﬂ ow capacity by 2500 Btu/ft

to determine

the propane Btu/hr capacity for a given pipe size and length.

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RBI Dominator Series Operations Instructions Page 22

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