Part number 550-142-085/0712
WM97+
gas
-
fired
water
boiler
—
Boiler Manual
– 16 –
Converting boiler to propane — WM97+155
Prepare boiler for propane —
WM97+155 only
(when required)
Propane operation
ALL WM97+ boilers must be converted for
propane operation
.
Converting an existing natural gas-fired boiler
for propane
— 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 and start up the boiler following in-
structions beginning on page 85 of this manual.
Verify propane gas orifice size
— See Figure 11.
Verify when installing that the orifice size marking
is correct. Orifice will be stamped as in illustration.
Failure to comply could result in severe personal
injury, death or substantial property damage.
Installing propane orifice —
WM97+155 only
If boiler is already installed
— You must turn off elec-
trical supply to the boiler and close the external manual
gas shut-off valve to isolate the boiler during conversion.
Allow the boiler to cool if it has been operating.
Following conversion of an installed boiler, follow all
instructions in this manual to start up the boiler and
verify operation of the boiler and all system components.
1. Locate the propane orifice from the propane conversion kit bag.
2. Verify that the stamping on the orifice is correct for the model size
(see Figure 11).
3. If the jacket front door is not already removed, remove it.
4. See Figure 12, page 17 and Figure 13, page 17 for the following.
Figure 11
Propane gas orifice identification
WM97+155
The jacket door must be in place during opera-
tion.
DO NOT operate the boiler with the jacket
door removed except for inspection and testing as
directed in this manual.
Support the gas valve after disconnect-
ing from the venturi. DO NOT allow it
to hang from the gas valve flex line.
When re-attaching the gas valve, ensure the
gas valve grommet (item 8, Figure 13) is in
place and in good condition. Inspect the gas
valve flex line to ensure it is undamaged and
in good condition.
5. Locate the gas valve and venturi (items 1 and 3).
6. Release the gas line to silencer bracket (item 6) from the
gas line and rotate it forward out of the way.
7. Use a 5-mm hex wrench to remove the three Allen screws
(item 2) that secure the gas valve to the venturi.
8. See Figure 13, page 17. Carefully pull the gas valve to
the right until it is free of the venturi. Securely support
the gas valve — DO NOT leave it dangling.
9. Insert the propane gas orifice (item 7) into the gas valve
opening as shown in Figure 13, page 17.
10. Make sure that the rubber grommet (item 8) is firmly
seated in the gas valve opening.
When re-attaching the gas valve, ensure the gas
valve grommet (item 8, Figure 13) is in place
and in good condition. Failure to comply will
cause a gas leak, resulting in severe personal
injury or death.
11. Reposition gas valve onto the venturi and reinstall the
gas valve retention screws (item 2).
Содержание WM97+110
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