Lochinvar 399 Prepare boiler, Remove boiler from wood pallet, Model, Gas conversions

Installation & Operation Manual

2Prepare boiler

Remove boiler from wood pallet

1.After removing the outer shipping carton from the boiler, remove the parts box.

2.Remove the front door to access the lag bolts in front of the unit (FIG. 2-1).

3.To remove the boiler from the pallet (after removing the front door):

a.Remove the two lag bolts from the wood pallet inside the boiler (FIG. 2-1).

b.Detach the boiler from the lag bolts in the rear of the unit, see FIG. 2-1.

NOTICE	Do not drop the boiler or bump the jacket
	on the floor or pallet. Damage to the
	boiler can result.

Figure 2-1Boiler Mounted on Shipping Pallet

Model 399

1.Remove the top and front access covers from the unit (no tools required for removal).

2.Remove the three screws securing the venturi to the blower. Note: When separating the venturi from the blower, take care not to damage the O-ring inside the blower (FIG. 2-2).

3.Remove the four star-drive screws securing the gas valve to the venturi (FIG. 2-2).

4.Locate the propane orifice disk from the conversion kit bag. Verify that the stamping on the orifice disk matches the boiler size (Model 399 - 8.0 LP orifice stamping).

5.Remove the existing orifice from the O-ring in the side of the gas valve and replace it with the orifice from the kit. Position and secure the orifice in the valve as shown in FIG. 2-2.

6.Reposition the gas valve against the venturi and replace the star-drive screws (FIG. 2-2) securing the valve to the venturi.

7.Inspect the O-ring inside the blower. Handle the O-ring with care, do not damage. Reposition the venturi against the blower and replace the screws securing the venturi to the blower (FIG. 2-2).

8.After installation is complete, attach the propane conversion label (in the conversion kit bag) next to the boiler rating plate. Attach the LP caution label (in the conversion kit bag) to the left side of the unit in the lower left corner.

9.Replace the top and front access covers.

Gas conversions

￿ WARNING	After converting to LP, check combustion per
	the Start-up procedure in Section 10 of this
	manual.	Failure to check and verify
	combustion could result in severe personal

￿WARNING

For a boiler already installed, you must turn off gas supply, turn off power and allow boiler to cool before proceeding. You must also completely test the boiler after conversion to verify performance as described under Start-up, Section 10 of this manual. Failure to comply could result in severe personal injury, death, or substantial property damage.

For the 399 Model you must install a propane orifice to operate the Knight XL on propane gas. Verify when installing that the orifice size marking matches boiler size (Model 399 - 8.0 LP orifice stamping).

Models 500 - 800 do not require an orifice installation for propane operation, but they will require a valve adjustment.

injury, death, or substantial property

damage.

Model 399: Inspect the O-ring when the ￿ DANGER blower is disassembled. The O-ring must be

in good condition and must be installed. Failure to comply will cause a gas leak, resulting in severe personal injury or death.

Figure 2-2Installing Propane Orifice - Model 399

BLOWER

O-RING VENTURI

SCREWS

QTY. 3

SCREWS O-RING

QTY. 4

BRASS ORIFICE

GAS VALVE

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