Weil-McLain Evergreen EVG 110, Manual

Page: 15 / 144

Prepa re boiler for propane —
EVG 70 only (if required)
Propane operation
ALL Evergreen
®
boilers must be converted
for propane operation .
Converting an existing natural gas-fi red
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 instructions beginning on
page 91 of this manual.
Verify 70 propane gas orifice size
—
See Figure 10 . Verify when installing that the
orifi ce size marking is correct. Orifi ces 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 orifi ce —
EVG 70 only
If boiler is already installed
— You must turn off
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 orifi ce from the propane conversion kit bag.
2. Verify that the stamping on the orifi ce 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.
Figure 10 Propane gas orifi ce identifi cation
EVG 70 (may be stamped 3.75 )
Figure 11 Gas valve and venturi
Part number 550-100-191/0917
15
®
g
as-fired water boiler —
70/110/155
Boiler Manual
Converting boiler to propane — EVG 70
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 fl ex 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 fl ex
line to ensure it is undamaged and in good
condition.