COMBAT® UHA UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL

SECTION 8: GAS PIPING

WARNING

Fire Hazard

Connectgassuppplyaccordingto toFigureFigure9. 9.

Gascanleakkififnotnotinstalledproperlyperly. .

Failuretofollowtheseinstructionscanresultinindeath, injuryororporpertypropertydamage. .

It is important that the gas supply pipe and the electrical connections do not support any of the heater’s weight.

A gas meter is connected to the service pipe by the gas supply company. An existing meter should be checked, preferably by the company, to ensure that the meter is adequate for the rate of gas supply required.

Installation pipes must be fitted in accordance with local and national codes. Pipes of smaller size than the heater inlet gas connection should not be used.

8.1 Connections

Connect the heater to the gas supply ensuring that the final connections are as follows:

•Gas supply pipe work is run in medium or heavy gauge tubing in compliance with local and national codes.

Figure 9: Gas Connection

•Meter and service must be large enough to handle all the burners being installed plus any other connected load. The gas pipe which feeds the system must be large enough to supply the required gas with a maximum pressure drop of 1/2" w.c. When gas piping is not included in the layout drawing, contact the local gas supplier.

•An isolating valve and union connection should be used and fitted into the supply adjacent to the heater.

•A minimum 1/8" NPT plugged tapping accessible for test connection must be installed immediately upstream of the gas supply connection to the heater.

•For suspended heaters, an approved metal flexible connection between the isolating valve and the heater may be used. To reduce pressure loss, use one pipe size larger than the heater gas connection.

IMPORTANT - The complete installation must be purged and tested for gas soundness in accordance with local and national codes.

•Do not high pressure (in excess of 1/2 psi [14" w.c.]) test the gas piping with the burner connected. Close manual shut-off valve during any pressure testing equal to or less than 1/2 psi (14" w.c.). Failure to follow these instructions can result in property damage.

Check the pipe and tubing ends for leaks before placing heating equipment into service. When checking for gas leaks, use a soap and water solution; never use an open flame.

•Hold gas nipple securely with pipe wrench when attaching the flex gas connector.

•Do not twist flexible gas connector.

•Ensure all

joints are gas tight.

 

Option A:

Do not bend flexible

Stainless Steel

Flex Gas

gas connector

Connector

sharply.

 

 

Option B:

Gas Shut-off Valve

Medium or Heavy

Gauge Pipe

 

Gas Connector

 

Drip Leg

Union

Cap

Connection

 

14

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Roberts Gorden 225 250, 200, 350, 150, 400, 300, 175 service manual GAS Piping, Connections
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225 250, 175, 300, 400, 150 specifications

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