Lochinvar WH 55-399 operation manual Final checks before starting the boiler, Start the boiler

10 Start-up(continued)

Final checks before starting the boiler

 Read the Knight Wall Mount Service Manual to

familiarize yourself with SMART SYSTEM control

module operation. Read this manual, pages 60 and 61

for proper steps to start boiler.

 Verify the boiler and system are full of water and all

system components are correctly set for operation.

 Verify the preparation procedures of Section 10, pages 57

and 58 have been completed.

 Ensure float ball is inside condensate trap (see FIG. 10-1).

 Verify electrical connections are correct and securely

Installation & Operation Manual

Check vent piping and air piping

1.Check for gas tight seal at every connection, seam of air piping, and vent piping.

￿WARNING Venting system must be sealed gas tight to prevent flue gas spillage and carbon

monoxide emissions, which will result in severe personal injury or death.

Check gas piping

1.Check around the boiler for gas odor following the procedure on page 48 of this manual (connecting gas supply piping).

attached.

 Inspect vent piping and air piping for signs of deterioration

from corrosion, physical damage or sagging. Verify air

piping and vent piping are intact and correctly installed

per this manual.

￿WARNING

If you discover evidence of any gas leak, shut down the boiler at once. Find the leak source with a bubble test and repair immediately. Do not start the boiler again until corrected. Failure to comply could result in severe personal injury, death, or substantial property damage.

Start the boiler

1.Read and follow the Operating instructions in FIG.’s 10-2 and 10-3 on pages 60 and 61.

Propane boilers – verify conversion

1.Verify propane conversion has been completed per the Propane Conversion instructions.

If boiler does not start correctly

1.	Check for loose connections, blown fuse or service switch
	off?
2.	Is boiler water temperature above 200°F?
3.	Is thermostat set below room temperature?
4.	Is gas turned on at meter or boiler?

￿WARNING

DO NOT adjust gas valve outlet pressure. The gas valve is factory-set for the correct outlet pressure. This setting is suitable for natural gas and propane, requiring no field adjustment. Attempting to alter the gas valve outlet pressure could result in damage to the valve, causing potential severe personal injury, death, or substantial property damage.

5. Is incoming gas pressure less than 4 inches w.c.?

If none of the above corrects the problem, refer to the Troubleshooting Section of the Knight Wall Mount Service Manual.

Check system and boiler

Check water piping

￿WARNING

Knight wall mount boilers are typically shipped ready to fire on natural gas. Check boiler rating plate to determine which fuel the boiler is set for. If set to natural gas, it may be converted to LP by installing an orifice (see page 13). In order to operate on LP gas, an orifice MUST BE installed. Failure to comply could result in severe personal injury, death, or substantial property damage.

1.Check system piping for leaks. If found, shut down the boiler and repair immediately. (See WARNINGS on pages 57 and 58 (startup) regarding failure to repair leaks.)

2.Vent any remaining air from the system using manual vents. Air in the system will interfere with circulation and cause heat distribution problems and noise.

Check flame and combustion

1.Shut off the main power to the boiler by placing the On/Off switch in the OFF position.

2.Remove the flue temperature sensor from the flue pipe connection. Note: Combustion measurements will be made at this point.

3.Turn on the main power to the boiler by placing the On/Off switch in the ON position.

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