Prestige SOLO 399 Boiler
Natural to Propane Instructions
6
creating a DHW call which will enable the DHW
circulator.
5. Press the
RIGHT
button to adjust the firing rate
to 100% (high fire). Hold down the
RIGHT
but-
ton to rapidly increase the firing rate.
6. If the combustion levels during high fire are out-
side the recommended combustion settings in
Table 2, adjust the THROTTLE SCREW (see Fig.
3) using a flat-blade screwdriver.
The throttle screw is highly sensitive and requires
the use of a combustion analyzer for adjustment.
An adjustment as small as an 1/8 of a turn can pro-
duce a large change in combustion levels.
7. Once the combustion level is set at high fire, man-
ually place the boiler into low fire mode by press-
ing the
LEFT
button to adjust firing rate down to
0% (low fire).
8. If the combustion level (O2 or CO2) during low
fire is not /-0.2 of the combustion level
measured at high fire, remove the offset cover
screw and adjust the plastic OFFSET SCREW
(see Fig. 3) using a T-40 Torx wrench as follows:
Counter-clockwise adjustment of OFFSET
SCREW at Low Fire (0% firing rate):
O2 increases and CO2 decreases
Clockwise adjustment of OFFSET SCREW at
Low Fire (0% firing rate):
O2 decreases and CO2 increases
9. Press the OK button while the fan icon is high-
lighted to shutdown the burner.
10. Press the
LEFT
or
RIGHT
button to highlight
the home screen icon
to exit the service mode.
WARNING
2012-33 Prestige Solo 399 Natural to LP Instructions
Revised Date: 6/5/12
