Roberts Gorden UHA[X][S] 60, UHA[X][S] 45, UHA[X][S] 30 Gas Piping, Connections, Gas Connection

UHA LOW PROFILE UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL

SECTION 8: GAS PIPING

WARNING

Fire Hazard

Connect gas supply according to Figure 15.

Do not use gas supply pipe and electrical connections to support heater’s weight.

Gas can leak if not installed properly.

Failure to follow these instructions can result in death, injury or property damage.

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:

Figure 15: Gas Connection

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

•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" wc 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.

Caution: Do not high pressure (in excess of 1/2 psi [14" wc]) 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" wc).

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 flexible gas connector.

•Do not twist flexible gas connector.

•Ensure all

joints are gas tight.

Do not bend flexible

gas connector

sharply.

Gas Shut-off Valve

Union

Connection

Option A:

Stainless Steel

Flexible Gas

Connector

Option B:

Medium or Heavy

Gauge Pipe

Gas Connector

Drip Leg

Cap

22