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 (21 pages)

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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

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. ALL PIPING MUST CONFORM WITH

LOCAL CODES. Use black steel pipe and malleable 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.