Gas Service And Pipe Capacity - Heat Wise SU-3 Manual

199,000 btu/h to 400,000 btu/h, 300,000 btu/h to 550,000 btu/h

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Manual (17 pages)

Manual (17 pages)

Table Of Contents

Table of Contents

Before connecting the burner to the gas supply, insure that the gas pipes and service

meter are large enough to permit the additional load of the gas burner (see Table 3).

Table 3: Pipe Capacity Table*( x 1,000 BTU's)

Pipe Length**

15'

30'

45'

60'

75'

90'

105'

120'

150'

180'

* Using 0.6 Specific Gravity Gas and a Pressure Drop of 0.3" of Water Column

** Each 90

elbow counts as 3' for the purpose of these calculations

Example 1:

There is 75 feet of 1 ¼" pipe from the meter to the burner and there are 5 elbows.

(5 elbows X 3') + 75' pipe = 15' + 75' = 90' of effective pipe length

The maximum BTU that can be fired is 310,000 BTU (see Table 3)

It is advisable to run a separate gas line from the meter to the gas burner to avoid

pressure drops. Refer to the above Pipe Capacity table for the correct sizes.

MUST CONFORM WITH LOCAL CODES.

fittings (do not use cast iron parts) with a suitable pipe dope which is resistant to liquefied

petroleum gases.

Piping should consist of:

1. A shut off valve approximately 6' away from the unit.

2. A 1/8" plugged NPT tapping for gas pressure measurement preferably on the manual shut

off valve (as shown or anywhere between the gas valve and the shut off value).

Note: The manual shut off valve and tapping are NOT part of the SU-4 Gas Burner.

Please make sure you conform to local and state codes.

3. A gas union.

4. A drip pipe.

Caution: The gas valve should not be subjected to more than ½" PSIG. Therefore, the

burner should be isolated during high-pressure gas leak tests. The appliance and its

individual shut off valve must be disconnected from the gas supply piping system during

any pressure testing of that system at test pressures in excess of ½ psig. The appliance

must be isolated from the gas supply piping by closing its individual manual shut off

valve during any pressure testing of the gas supply piping system at test pressures equal

to or less than ½ psig.