Converting Boiler To Propane - Eco 155 - Weil-McLain Series 2 Manual

® S
ERIES
Converting boiler to propane — ECO 110
Prepare boiler for propane —
ECO 110 only (if required)
Propane operation
ALL ECO boilers must be converted for
propane operation
Converting an existing natural gas-fired
boiler for propane
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 instructions
beginning on page 79 of this manual.
Verify 110 propane gas orifice size
See Figure 13. Verify when installing that the
orifice size marking is correct. Orifices will be
stamped as in illustration or "3.7" for model
110.
ECO 110 boiler Series 1 and ECO 110 boiler
Series 2 boilers use different size orifices. You
must confirm the series boiler you have and use
the correct orifice size.
Failure to comply could result in severe personal
injury, death or substantial property damage.
Installing propane orifice —
ECO 110 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 13).
3. If the jacket door is not already removed, remove it.
4. Locate the gas valve and venturi (see Figure 14).
5. Release the gas line from the silencer bracket clip (item 5, page
18) and rotate it out of the way.
6. Use a T25-mm Torx bit to remove the two (2) bolts (item 3)
that secure the gas valve to the venturi.
Part number 550-142-190/1218
2
-
G
AS FIRED WATER BOILER
.
— For a boiler already
— You must turn off
— Boiler Manual
Figure 13 Propane gas orifice identification
ECO
—
Figure 14 ECO 110 Gas valve and venturi
1 Gas valve
2 Venturi
3 Gas valve screws to venturi
Support the gas valve after disconnecting
it. DO NOT allow it to hang from the gas
valve flex line. When re-attaching the gas
valve, ensure the gas valve propane orifice
is properly seated in rubber boot (item 6,
Figure 15, page 18) and is in place and in good
condition. Inspect the gas valve flex line to
ensure it is undamaged and in good condition.
110 (may be stamped 3.7 only)
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