6 Gas connections

Connecting gas supply piping

NOTICE

For dual fuel models, reference the Crest

Dual Fuel Supplemental Manual.

 

1.Refer to FIG. 6-1 to pipe gas to the boiler.

a.Install ground joint union for servicing, when required.

b.In Canada – When using manual main shutoff valves, it must be identified by the installer.

Figure 6-1Gas Supply Piping

GAS SUPPLY

UNION

(FACTORY SUPPLIED)

MANUAL SHUTOFF

VALVE (FACTORY SUPPLIED)

SEDIMENT TRAP / DRIP LEG CLEAN OUT (FACTORY SUPPLIED)

2.Support piping with hangers, not by the boiler or its accessories.

The gas valve and blower will not support ￿ WARNING the weight of the piping. Do not attempt

to support the weight of the piping with the boiler or its accessories. Failure to comply could result in severe personal injury, death, or substantial property damage.

Installation & Operation Manual

3.Purge all air from the gas supply piping.

4.Before placing the boiler in operation, check the boiler and its gas connection for leaks.

a.The appliance must be disconnected from the gas supply piping system during any pressure testing of that system at a test pressure in excess of 1/2 PSIG (3.5 kPa).

b.The appliance must be isolated from the gas supply piping system by closing a manual shutoff valve during any pressure testing of the gas supply piping system at test pressures equal to or less than 1/2 PSIG (3.5 kPa).

c.The appliance and its gas connection must be leak tested before placing it in operation.

￿WARNING Do not check for gas leaks with an open flame – use the bubble test. Failure to

use the bubble test or check for gas leaks can cause severe personal injury, death, or substantial property damage.

5.Use pipe sealing compound compatible with propane gases. Apply sparingly only to male threads of the pipe joints so that pipe dope does not block gas flow.

￿ WARNING Failure to apply pipe sealing compound as detailed in this manual can result in severe

personal injury, death, or substantial property damage.

Table 6A Gas Inlet Size

Model

Gas Inlet Size

 

 

FB1500

1 1/2"

 

 

FB2000

1 1/2"

 

 

FB2500

2"

 

 

FB3000

2"

 

 

FB3500

2"

 

 

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Lochinvar 3.5, 2.5 service manual Gas connections, Connecting gas supply piping, Model Gas Inlet Size
Page 30 Page 32

3, 2, 3.5, 2.5 specifications

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