Weil-McLain Evergreen EVG 110, Manual

Page: 19 / 144

Converting boiler to propane — EVG 155
Installing propane orifi ce —
EVG 155 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 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.
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.
Figure 16 Propane gas orifi ce identifi cation
EVG 155
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 fl ex line.
When re-attaching the gas
valve, ensure the gas valve grommet (item
8, Figure 18, page 20 ) is in place and in
good condition. Inspect the gas valve fl ex
line to ensure it is undamaged and in good
condition.
9. Insert the propane gas orifi ce (item 7) into the gas valve
opening as shown in Figure 18, page 20 .
10. Make sure that the rubber grommet (item 8) is fi rmly
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.
The valve could be
damaged by manometer fl uid 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.
14. Perform complete start-up sequence (beginning on
page 91 ), including check for gas leaks and checking
for proper operation.
15. Reinstall jacket door.
Part number 550-100-191/0917
19
®
g
as-fired water boiler —
70/110/155
Boiler Manual
Prepa re boiler for propane —
EVG 155 only (if required)
Propane operation
ALL Evergreen
®
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 instructions beginning on page 91
of this manual.
Verify propane gas orifice size — See
Figure 16 . Verify when installing that the orifi ce
size marking is correct. Orifi ce will be stamped as
in illustration.
Failure to comply could result in severe personal
injury, death or substantial property damage.