Weil-McLain Ultra Manual page 10

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gas fired water boiler
Prepare boiler
Installing propane orifice
If boiler is already installed
trical 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 propane orifice disc from conversion kit bag.
2. Verify that the stamping on the orifice disk matches the model
size (see Figure 5).
3. With the new boiler on its back, remove jacket front door by re-
moving two knurled head screws at lower front.
4. Lift the door away from boiler.
5. Remove the air inlet silencer from the adapter:
a. Models 80 and 105: See
b. Larger models: See Figure 107, page 99.
6. Disconnect the gas valve electrical plug.
7. See Figure 6 or Figure 7. Remove the 4 screws securing gas valve
inlet adapter to valve.
8. Use a 5-mm wrench to remove the three Allen-head screws securing
the gas valve to the venturi (Figure 6 or Figure 7).
9. Place orifice in the black rubber grommet in the side of the gas
valve and secure in valve (Figure 6 or Figure 7).
See Figure 6 or Figure 7. 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 6 or Figure 7).
11. See Figure 6 or Figure 7. 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.
DO NOT ATTEMPT TO MEASURE VALVE OUTLET
PRESSURE
eter fluid 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 conversion label
(in conversion kit bag) next to the boiler rating plate.
15. Replace jacket front panel.
10
— Boiler Manual
(continued)
— You must turn off elec-
Figure 105, page 97.
The valve could be damaged by manom-
Figure 5
Orifice identification
Figure 6
Installing propane orifice
(Ultra-105 or Ultra-80LP ONLY)
Figure 7
Installing propane orifice
(Ultra-155, -210, -285, and -310)
Part number 550-100-066/0608