Instructions

PRESTIGE Solo 175 & 250
Service Parts Instructions
8
2. Check the igniter for fouling or damaged insu-
lation if a low flame signal is read.
3. Check ground wiring and continuity as a cause
for low flame signal. Replace igniter if condi-
tions are unsatisfactory.
Check Combustion Levels
Perform a complete combustion check to ensure the
following combustion levels are met at high and
low inputs and the burner is operating at optimum
conditions.
The combustion testing and adjustments must be
performed by a qualified installer, service agency
or the gas supplier. All combustion measurements
must be perform with calibrated equipment to
ensure proper readings and accuracy.
Failure to perform a complete combustion test at
both high and low input rates may result in
incomplete combustion and the production of car-
bon monoxide, which can cause severe personal
injury, death or substantial property damage.
MCBA Instructions
1. Manually place the boiler into high fire mode
by pressing the MODE button with “+” button
simultaneously on the control panel display
while in the standby (STBY) mode.
The control panel will display a H followed by
the current boiler temperature when placed into
high fire test mode.
2. If the combustion levels during high fire is outside
the recommended combustion settings adjust the
THROTTLE SCREW (see Fig. 7) as follows:
Counter-clockwise adjustment of the throttle
screw at high fire:
O
2
decreases and C0
2
increases
Clockwise adjustment of the throttle screw at
high fire:
O
2
increases and CO
2
decreases
3. Once the combustion level is set at high fire,
manually place the boiler into low fire mode by
pressing the MODE button with “-” button
simultaneously on the control display while in
the standby (STBY) mode.
The control panel will display a L followed
by the current boiler temperature when
placed into low fire test mode.
4. If the C0
2
combustion level at low fire is not
within +/- 0.2% of the combustion level mea-
sured at high fire, remove the offset cover screw
and adjust the plastic OFFSET SCREW using
a T40 Torx screwdriver (see Fig. 7) as follows:
Counter-clockwise adjustment of offset screw at
low fire:
O
2
increases and CO
2
decreases
Clockwise adjustment of offset screw at low fire:
O
2
decreases and CO
2
increases
WARNING
NOTICE
WARNING
NOTICE
Natural Gas Propane
O2 Min. 2.30% 2.70%
O2 Max. 5.30% 4.70%
CO2 Min. 8.80% 10.70%
CO2 Max. 10.50% 12.00%
CO Max. 100 ppm 100 ppm