Prestige SOLO 399 Boiler
Natural to Propane Instructions
2
Installation of the Natural Gas Orifice
1. Turn off the electrical power supply to the boiler.
2. Close the external manual gas shut off valve to the
unit.
3. Remove the front panel of the Prestige by remov-
ing the thumb screw along the upper edge of the
unit. Lift the panel up and pull forward to remove
the front panel from the unit.
4. Remove the Phillips head retaining screw at the
bottom of the control panel assembly. Swing
open the control panel assembly (MCBA).
5. Slide control panel retaining clips inward and
swing control panel down (TRIMAX).
6. Remove the air inlet elbow from the venturi using
a twist motion.
7. Disconnect the gas supply piping inside the Pres-
tige at the union located below the gas valve. See
Fig. 1.
8. Disconnect the wiring from the gas valve.
9. Remove the six T-40 Torx screws securing the
venturi to the blower. See Fig. 2.
10. Remove the gas valve/venturi assembly from the unit.
11. Remove the (4) T-25 Torx screws securing the gas
valve extension pipe to the venturi. See Figs. 1 & 2.
12. Remove the existing propane gas orifice from between
the gas valve extension pipe and venturi.
There are O-ring gaskets between the venturi and
blower housing and also between the venturi and
gas valve extension pipe. These O-Rings must be
reinstalled with the gas valve/venturi assembly.
Use care not to damage these gaskets.
WARNING
1
3
4
5
2
1. Blower
2. Venturi Assembly
3. Gas Valve Extension Pipe
4. Gas Valve
5. Union
Fig. 1: Prestige 399 Burner Assembly
(4) T-25
Torx Screws
Venturi O-Ring
O-Rings
Brass Gas Orifice
(6) T-40
Torx Screws
Air inlet
Elbow O-Ring(s)
Venturi Air
Intake
Fig. 2: Venturi/Gas Orifice Assembly
