Venturi Replacement Kit
for PRESTIGE 399
4
4. If the combustion level during Low fire is not
/-0.2% of the combustion level measured
at High fire, adjust the OFFSET SCREW below
the cap on the gas valve (see Fig. 4) as follows.
Counter-clockwise adjustment of OFFSET
SCREW at low fire:
O2 increases and CO2 decreases
Clockwise adjustment of OFFSET SCREW at
low fire:
O2 decreases and CO2 increases
5. Press the “+” and “-” buttons simultaneously to
shutdown the burner.
Trimax Instructions
1. Press the round INSTALLER button. See Fig. 5.
2. Enter the installer access code “054” by using
the
LEFT
and
RIGHT
buttons to select a digit
and the
UP
and
DOWN
buttons to change the
digit. Press the
OK
button to enter the access
code.
3. Press the
RIGHT
button to highlight the
Manual Operation icon
then press the
OK
button.
4. Press the
OK
button while the FAN icon is
highlighted to manually fire the burner and
power the CH circulator.
An adequate CH load must be present to dis-
sipate the heat generated during the combus-
tion test. If an adequate CH load is not avail-
able, an indirect water heater can be used to
dissipate the heat by creating a DHW call
which will enable the DHW circulator.
NOTICE
4
1
2
2
3
1
5
Fig. 4: Venturi Gas Valve Assembly
1. Brown (MCBA) Black (TriMax) wire
2. Blue (MCBA) White (TriMax)wire
3. Throttle screw
4. Offset screw
5. Inlet Pressure Tap
Installer
Button
Fig. 5: Trimax Navigation Buttons
Manual Operation
Released
Off
Off
Off
CH
CH1
FAN
DHW
SYS
CH2
