Prepare Boiler; Gas Conversions - Cadet 40-120 Installation And Service Manual

2

Prepare boiler

Gas conversions

The gas conversion procedure should
WARNING
be accomplished BEFORE the boiler is
installed. For a boiler already installed,
you must turn off gas supply, turn off
power, and allow the 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.
You must install the propane orifice to
fire the Cadet heating boiler on propane.
Verify when installing that the orifice size
marking matches boiler size (Table 2A).
Failure to comply could result in severe
personal injury, death, or substantial
property damage.
Table 2A LP Conversion Table
LP Conversion Table
Model
40
70
100
120/ 120 (combi)
1. Remove the front access cover from the unit (no tools
required for removal).
2. Disconnect the ribbon cable from the control board.
Remove the four (4) screws securing the display to the front
of the unit and remove the display.
3. Disconnect the wiring harness from the wiring connector
located on the gas valve.
4. Using a torx wrench, remove the two (2) screws securing the
gas valve to the venturi along with the black rubber coupling
on the gas valve (natural) (FIG. 2-1).
5. Locate the propane orifice disk from the conversion kit bag.
Verify that the stamping on the orifice disk matches the
boiler size (40 - 120, see Table 2A).
6. Place the propane orifice disk inside the black rubber
coupling, then place the black rubber coupling on the
smooth male fitting of the gas valve and secure to the venturi
(see FIG. 2-1).
7. Reposition the gas valve against the venturi and replace the
two (2) screws removed in Step 4, securing the valve to the
venturi (FIG. 2-1).
8. Reattach the wiring harness to the gas valve.
9. After installation is complete, fill out the gas conversion
label (in the conversion kit bag) and affix it to the unit
above the boiler rating plate outside the unit. Hang the LP
warning label (in the conversion kit bag) on the gas pipe
underneath the boiler (FIG. 2-2).
10. Replace the front access cover.
12
LP Orifice Stamping
40/70
100/120
Installation & Service Manual
After 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.
Figure 2-1 Installing Propane Orifice
GAS VALVE
Figure 2-2 Gas Conversion Label Location
This appliance was converted on ___/___/_____
(day / month / year)
to _________ gas with Kit No. ______________
with burner orifices (size or number) _________
by ____________________________________
______________________________________
______________________________________
(name & address of organization making this
conversion, who accepts the responsibility for
the correctness of this conversion)
Refer to the rating plate for the input rating
and gas pressure settings for the converted gas.
GAS CONVERSION
LABEL
(AFFIX TO JACKET
WHERE SHOWN)
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.
Do not attempt to use the copper pipes to
CAUTION
lift the boiler (FIG. 2-3).
BLOWER
VENTURI
BRASS ORIFICE
COUPLING
SCREWS
IMG00256
LP WARNING
LABEL
(HANG FROM
GAS PIPING)