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Installation & Operation Manual
2 Prepare boiler
13
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.
Do not drop the boiler or bump the jacket
on the floor or pallet. Damage to the
boiler can result.
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.
Figure 2-1 Boiler Mounted on Shipping Pallet
Gas conversions
NOTICE
ƽ WARNING
BLOWER
O-RING
VENTURI
SCREWS
QTY. 3
GAS VALVE
BRASS ORIFICE
O-RING
SCREWS
QTY. 4
Figure 2-2 Installing Propane Orifice - Model 399
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.
ƽ DANGER
Model 399: Inspect the O-ring when the
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.
ƽ 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
injury, death, or substantial property
damage.