Converting Boiler To Propane - Eco 70 - Weil-McLain Series 2 Manual

® S
ERIES
Converting boiler to propane — ECO 70
Prepare boiler for propane —
ECO 70 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 70 propane gas orifice size
See Figure 10. Verify when installing that the
orifice size marking is correct. Orifices will be
stamped as in illustration or with "3.75" for
model 70.
Failure to comply could result in severe personal
injury, death or substantial property damage.
Installing propane orifice —
ECO 70 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 10).
3. If the jacket door is not already removed, remove it.
4. Locate the gas valve and venturi (see Figure 11).
5. Pull the gas valve retention ring (item 3, Figure 11) off of the
gas valve/venturi joint.
6. Carefully pull the gas valve to the right until it is free of the
venturi. Leave the pressure reference hose (item 4, Figure 11)
connected at both ends.
Part number 550-142-190/1218
2
-
G
AS FIRED WATER BOILER
.
— For a boiler already
— You must turn off
— Boiler Manual
Figure 10 Propane gas orifice identification
ECO
—
Figure 11
Gas valve and venturi
1 Gas valve
2 Venturi
3 Gas valve retention ring
4 Pressure reference hose — LEAVE CONNECTED AT BOTH
ENDS
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-to-venturi O-ring
(item 5, Figure 12, page 16) is in place and
in good condition. Inspect the gas valve flex
line to ensure it is undamaged and in good
condition.
70 (may be stamped 3.75)
15