Weil-McLain Series 2 Manual page 19

® S
ERIES
Converting boiler to propane — ECO 155
Prepare boiler for propane —
ECO 155 only (if required)
Propane operation
ALL ECO boilers must be converted for
propane operation
Converting an existing natural gas-fired boiler
for propane
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
instructions beginning on page 79 of this manual.
Verify propane gas orifice size
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 —
ECO 155 only
If boiler is already installed
electrical 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 16).
3. If the jacket door is not already removed, remove it.
4. See Figure 17, page 20 and Figure 18, page 20 for the following.
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 5mm hex wrench to remove the three (3) Allen screws
(item 2) that secure the gas valve to the venturi.
Part number 550-142-190/1218
2
-
G
AS FIRED WATER BOILER
.
— For a boiler already installed, you
— See Figure 16.
— You must turn off
— Boiler Manual
Figure 16 Propane gas orifice identification
ECO 155
8. See Figure 18, page 20. 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.
S u p p o r t t h e g a s v a l v e a f t e r
disconnecting from the venturi. DO
NOT allow it to hang from the gas
valve flex line.
valve, ensure the gas valve grommet (item
8, Figure 18, page 20) is in place and in
good condition. Inspect the gas valve flex
line to ensure it is undamaged and in good
condition.
9. Insert the propane gas orifice (item 7) into the gas valve
opening as shown in Figure 18, page 20.
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 18, page 20)
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).
12. Swing the gas line to silencer bracket (item 6) back into
position and snap onto the gas line.
DO NOT ATTEMPT TO MEASURE VALVE
OUTLET PRESSURE.
damaged by manometer fluid contamination.
Failure to comply could result in severe
personal injury, death or substantial property
damage.
13. After installation is complete, attach the propane
conversion label (in conversion kit bag) next to the
boiler rating plate.
When re-attaching the gas
The valve could be
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