Weil-McLain 4 Series Manual page 49

®
Series 4
Prepare boiler — convert for propane
4. Lift the door away from boiler.
5. Remove the air inlet silencer from the adapter:
a. Models 80 and 105: See Figure 134, page 133 .
b. Models 155 and 230: See Figure 135, page 134 .
c. Models 299/310 and 399: See Figure 136, page 135 .
6. Disconnect the gas valve electrical plug.
7. See Figure 43, page 48 or Figure 45 . Remove the 4 screws
securing gas valve inlet adapter to valve.
8. Use a 5mm wrench to remove the three Allen-head screws
securing the gas valve to the venturi ( Figure 43, page 48
or Figure 45 ).
9. Place orifi ce in the black rubber grommet in the side of
the gas valve and secure in valve ( Figure 43, page 48 or
Figure 45 ).
See Figure 43, page 48 or Figure 45 . Inspect the
O-ring between the gas valve and gas valve inlet
adapter whenever they are disassembled. The
O-ring must be in good condition and must be
installed. Failure to comply will cause a gas leak,
resulting in severe personal injury or death.
10. Reposition gas valve against venturi and replace (3) Allen-
head screws securing valve to venturi ( Figure 43, page 48
or Figure 45 ).
11. See Figure 43, page 48 or Figure 45 . Secure gas valve inlet
adapter to gas valve with 4 screws. Make sure the plastic
hose is connected from gas valve to inlet elbow on Ultra-80
and -105.
aged by manometer fl uid contamination. Failure
to comply could result in severe personal injury,
death or substantial property damage.
12. Connect gas valve electrical plug to valve terminals.
13. Re-attach the air inlet silencer.
14. After installation is complete, attach the propane conver-
sion label (in conversion kit bag) next to the boiler rating
plate.
15. Replace jacket front panel.
Part number 550-100-400/0119
gas-fired water boiler — Boiler Manual
The valve could be dam-
Figure 45
Ultra-399 boilers
Ul tra-399 boilers are converted for propane by
adjustment of the gas valve throttling screw.
See instructions on page 41 of this manual.
Do not perform the propane conversion of
an Ultra-399 boiler without using a fl ue gas
analyzer. The proper use of a fl ue gas analyzer
is required to determine proper gas valve set-
tings. Improper gas valve settings can cause
severe personal injury, death or substantial
property damage.
(continued)
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