Venturi Replacement Kit
for PRESTIGE 399
Instructions
1. Turn power to the unit “OFF”.
2. Remove the front jacket panel. Swing away the
Control Module panel (MCBA). Tilt down the
Control Module panel (TriMax).
3. Shut off gas supply to the Prestige boiler at the
main manual shutoff valve.
4. Disconnect the gas piping at the union located just
before the gas valve inside the boiler enclosure.
5. Disconnect wires to the gas valve.
6. Remove the air inlet elbow from the venturi.
Note the orientation of the venturi / gas valve
assembly in relation to the blower housing
when disassembling the venturi / gas valve
assembly.
7. Using the T-40 Torx wrench from the kit,
remove the 6 screws securing the venturi
assembly to the blower, see Fig. 2. Remove the
venturi / gas valve assembly from the blower.
8. Remove the 4 screws securing the gas valve
outlet pipe to the venturi.
9. Install the new venturi to the gas valve outlet
pipe using the original 4 mounting screws.
Ensure the new gaskets are in place and the
screws are tight.
Ensure the brass orifice (natural or propane)
is in place prior to the assembly ot the ven-
turi to the gas outlet pipe.
10. Install the new venturi O-ring gasket on the
blower. Reassemble the venturi / gas valve
assembly to the blower housing using the 6 sup-
plied T-40 Torx screws. Make sure all screws
are tight and secure.
11. Reconnect the gas supply piping using two
wrenches. Open the manual gas shut off valve
to check and test all gas connections for leaks
before placing the PRESTIGE unit back into
operation. Repair leaks if found.
NOTICE
WARNING
2
Venturi Mounting
Screw
Gas Valve
Fig. 2: Venturi/Gas Valve Assembly
Gas Outlet
Pipe
Blower
Venturi / Blower
O-Ring Gasket
Venturi / Gas Pipe
Gasket
Venturi
Fig. 3: Venturi/Blower/Gas Valve Assembly
