Lochinvar 400 Final checks before starting the boiler, Start the boiler, Check system and boiler

10 Start-up(continued)

Final checks before starting the boiler

Read the Knight XL Service Manual to familiarize yourself with SMART SYSTEM control module operation. Read this manual, page 58 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 55 and 56 have been completed.

Fill the vent condensate trap with water (removing the retaining screw in order to remove the 2 inch PVC cap with the switch located at the top of the trap). Replace the cap. Press the cap onto the trap until the cap makes contact with the drain. Replace the retaining screw.

Verify electrical connections are correct and securely 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.

Start the boiler

1.Read and follow the Operating instructions in FIG. 10-2, page 58.

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 (93°C)?

3.Is thermostat set below room temperature?

4.Is gas turned on at meter or boiler?

5.Is incoming gas pressure less than 4 inches w.c. (.99 kPa)?

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

Check system and boiler

Check water piping

1.Check system piping for leaks. If found, shut down the boiler and repair immediately. (See WARNINGS on pages 55 and 56 (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.

Installation & Operation Manual

Check vent piping and air piping

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

￿WARNING Venting system must be sealed gastight 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 46 of this manual (connecting gas supply piping).

￿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.

Propane boilers – verify conversion

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

￿WARNING DO NOT adjust or attempt to measure 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 or measure the gas valve outlet pressure could result in damage to the valve, causing potential severe personal injury, death, or substantial property damage.

￿WARNING Knight XL 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 or by making a gas valve adjustment (see pages 13 and 14). In order to operate on LP gas, an orifice MUST BE installed or a gas valve adjustment MUST BE made. Failure to comply could result in severe personal injury, death, or substantial property damage.

Check flame and combustion

1.Turn the main power off 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 the main power on to the boiler by placing the “On/Off” switch in the ON position.

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