Prepare Boiler; Remove Boiler From Wood Pallet; Gas Conversions; Model 400 - Lochinvar KnightXL KBN400 Installation & Operation Manual

2

Prepare boiler

Remove boiler from wood pallet

1. Aft er 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 (aft er 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.
Do not drop the boiler or bump the jacket
NOTICE
on the fl oor or pallet. Damage to the boiler
can result.
Figure 2-1 Boiler Mounted on Shipping Pallet

Gas conversions

For a boiler already installed, you must
WARNING
turn off gas supply, turn off power and
allow boiler to cool before proceeding.
You must also completely test the boiler
aft er 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 400 Model you must install a
propane orifi ce to operate the Knight XL
on propane gas. Verify when installing that
the orifi ce size marking matches boiler size
(Model 400 - 8.0 LP orifi ce stamping).
Models 501 - 801 do not require an orifi ce
installation for propane operation, but
they will require a valve adjustment.

Model 400

1. Remove the top and front access covers from the unit (no
2. Remove the three screws securing the venturi to the blower.
3. Remove the four star-drive screws securing the gas valve to
4. Locate the propane orifi ce disk from the conversion kit bag.
5. Remove the existing orifi ce from the O-ring in the side of
6. Reposition the gas valve against the venturi and replace the
7. Inspect the O-ring inside the blower. Handle the O-ring
8. Aft er installation is complete, attach the propane conversion
. 2
9. Replace the top and front access covers.
Figure 2-2 Installing Propane Orifi ce - Model 400
Installation & Operation Manual
tools required for removal).
Note: When separating the venturi from the blower, take
care not to damage the O-ring inside the blower (FIG. 2-2).
the venturi (FIG. 2-2).
Verify that the stamping on the orifi ce disk matches the
boiler size (Model 400 - 8.0 LP orifi ce stamping).
the gas valve and replace it with the orifi ce from the kit.
Position and secure the orifi ce in the valve as shown in FIG.
2-2.
star-drive screws (FIG. 2-2) securing the valve to the venturi.
with care, do not damage. Reposition the venturi against the
blower and replace the screws securing the venturi to the
blower (FIG. 2-2).
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.
Aft er converting to LP, check combustion
WARNING
per the Start-up procedure in Section 10
of this manual. Failure to check and verify
combustion could result in severe personal
injury, death, or substantial property damage.
Model 400: Inspect the O-ring when the
DANGER
blower is disassembled. Th e 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.
BLOWER
O-RING
SCREWS
O-RING
QTY. 4
BRASS ORIFICE
VENTURI
SCREWS
QTY. 3
GAS VALVE
13