2
Prepare boiler
12
Remove boiler from wood pallet
1. After removing the outer shipping carton from the
boiler, remove the parts box.
2. To remove the boiler from the pallet:
a. Remove the two (2) lag bolts securing the
bottom of the unit to the pallet.
b. Lift the boiler off the wall bracket mounted to
the pallet (FIG. 2-1).
REMOVE SHIPPING
(WALL) BRACKET
DO NOT DISCARD.
WILL BE NEEDED TO
SECURE THE BOILER
TO THE WALL.
DIR #2000528206 00
Figure 2-1 Boiler Mounted on Shipping Pallet
CAUTION
Do not attempt to use the water pipe
fittings or gas pipe to lift the boiler.
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.
Gas conversions
WARNING
You must install a propane venturi to operate the Noble
Combi Boiler on propane gas. Verify when installing that the
venturi label marking matches the boiler size (see Table 2A).
1. If boiler is already installed, you must turn off the gas
supply, turn off the power, and allow the boiler to cool
before proceeding.
2. Remove the front access cover from the unit (no tools
required for removal).
3. Using a 5/16" nut driver, loosen the rachet clamp securing
the air intake fitting to the venturi assembly. Slide the
rubber boot off the venturi.
4. Using an adjustable wrench, loosen the union between the
gas valve adapter and the venturi assembly. Remove the
gasket between the gas piping and venturi (FIG. 2-2).
5. Using a 3 mm Allen wrench, remove the three (3) screws
securing the venturi to the fan assembly and proceed to
remove the natural gas venturi from the unit, making sure
not to damage the blower O-ring gasket (FIG. 2-2).
6. Install the air shutter (reference Table 2A for the model
specific air shutter to be installed).
a. Disconnect the wiring from the fan and remove the
bolts securing the fan to the heat exchanger top plate.
b. Remove the fan and gasket, and install the air shutter
provided in the kit.
Note:
On NKC110 models, the air
shutter MUST be installed in the proper direction.
Install the air shutter so that the hole in the corner is
oriented towards the back right corner of the unit
(opposite the front door and gas piping).
c.
Replace all torn or damaged gaskets. Reassemble the
fan assembly and reconnect the wiring harnesses
before operation.
7. Install the propane venturi and verify the following:
a. The UP arrow on the plastic housing is pointing
upward.
b. The threaded connection for the gas piping is facing
towards the LEFT of the unit.
8. Reassemble the unit by following the previous steps in
revers order, taking care to ensure that the venturi adapter
gasket is seated properly before tightening the nut on the
venturi. NOTE: Replace any torn or damaged gasket(s) that
may have been damaged or torn during installation.
9. After installation is complete, fill out the gas conversion
label (in the conversion kit bag) and affix it to the unit to the
right of the control display as shown in FIG. 2-3.
10. Replace the front access cover removed in Step 2 and
resume operation.
Do not drop the boiler. Damage to the
boiler can result.
NOTICE
3. Remove the two (2) lag bolts securing the wall bracket to the
wood pallet. Be certain not to lose the wall bracket as it will
be needed for securing the boiler to the wall (FIG. 2-4).
Installation & Service Manual
Table 2A LP Conversion Table
Model
Kit #
Venturi Ø
(mm)
Orifice Ø
Air
Shutter
Bottom
Top
110
100275546
20 mm
2.45 mm
2.55 mm
100275611
150
100275548
24 mm
3.20 mm
2.95 mm
100275613
199
100275549
22 mm
3.30 mm
3.10 mm
100275615
DANGER
When removing the natural gas venturi,
inspect the gasket at the gas connection
and the O-ring at the blower. These
gaskets must be in good condition and
must be installed. Failure to comply
will cause a gas leak, resulting in severe
personal injury or death.
Do not attempt to lift the boiler using the
gas pipe as a handle.
CAUTION
F I R E T U B E C O M B I
™
