Installation & Service Manual

3Gas connections (continued)

Checking Gas Supply Pressure

GAS SUPPLY PRESSURE

MANOMETER

GAS VALVE

Figure 3-4_Gas Supply Pressure

1.

Turn the power “OFF” at the main disconnect

 

switch.

2.

Turn gas valve control knob to the “OFF” position.

3.

Shut off gas supply at the manual valve in the gas piping

 

to the appliance. If fuel supply is L.P. gas, shut off gas

 

supply at the tank.

4.

Remove the 1/8" hex plug, located on the “inlet” side of

 

the gas valve and install a fitting suitable to connect to a

 

manometer or magnahelic gauge. Range of scale should

 

be 14" w.c. or greater to check inlet pressure. See

 

FIG.’s 3-3 and 3-4 for location.

8.Set the thermostat(s) to call for heat.

9.Observe the gas supply pressure with all burners firing. Ensure inlet pressure is within specified range. Check gas supply pressure with all other gas fired appliances in operation to ensure proper gas volume during periods of peak gas usage.

10.If gas pressure is out of range, contact gas utility, gas supplier, qualified installer or service agency to determine necessary steps to provide proper gas pressure to the control.

11.If the gas supply pressure is within the specified range, proceed with the following steps to return the appliance to service.

12.Turn the power “OFF” at the main disconnect switch.

13.Turn gas valve control knob to “OFF” position.

14.Shut off gas supply at the manual valve in the gas piping to the appliance. If fuel supply is L.P. Gas, shut off gas supply at the tank.

15.Remove the manometer and related fittings from the “inlet” side of the gas valve, replace 1/8" hex plug in gas valve.

16.Turn on gas supply at the manual valve, turn on L.P. Gas at tank if required.

17.Turn the power “ON” at the main disconnect switch.

18.Turn the gas valve control knob to the “ON” position. Spark ignition models will automatically light the pilot on a call for heat.

19.Set the thermostat to call for heat. The appliance is now ready to operate.

5.

Turn on gas supply at the manual valve, turn on L.P. gas

 

at tank if required.

6.

Turn the power “ON” at the main disconnect switch.

7.

Follow the “Lighting Instructions” in Section 6 - Startup

 

to light the pilot . Turn gas valve control knob to the

 

“ON” position.

IMPORTANT

Upon completion of any testing on the gas system, leak test all gas connections with a soap solution while main burners are operating. Immediately repair any leak found in the gas train or related components. Do Not operate an appliance with a leak in the gas train, valves or related piping.

Check burner performance by cycling the system while you observe burner response. Burners should ignite promptly. Flame pattern should be stable, see the “Maintenance Section - Normal Flame Pattern”. Turn system off and allow burners to cool, then cycle burners again to ensure proper ignition and flame characteristics.

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Lochinvar 45, 000 Btu/hr, 000 - 260 service manual Checking Gas Supply Pressure, 4Gas Supply Pressure
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000 - 260, 000 Btu/hr, 45 specifications

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