CHALLENGER
Natural Gas to Propane Instructions
4
Table 2: Recommended Combustion Levels
Failure to perform a complete combustion test at both
high and low input rates may result in incomplete combus-
tion and the production of carbon monoxide, which can
cause severe personal injury, death or substantial property
damage.
2. Manually place the appliance into high fire mode by
pressing both the service button “
” with “+” but-
ton simultaneously on the control panel display two
times.
The control panel will display a H followed by the current
appliance temperature when placed into high fire test
mode.
The THROTTLE SCREW on the CHALLENGER’s gas valve
works opposite than the PRESTIGE. If you turn the
CHALLENGER’s throttle screw clockwise you increase the
input, CO2 and CO of the appliance. EXERCISE CARE!
3. If the combustion levels during high fire are outside
the recommended combustion settings adjust the
THROTTLE SCREW (see Figs. 3 & 4 on page 5)
using a T15 Torx wrench as follows:
Counter-clockwise adjustment of the THROTTLE
SCREW at High Fire:
O2 increases and CO2 decreases
Clockwise adjustment of the THROTTLE SCREW
at High Fire:
O2 decreases and CO2 increases
4. Once the combustion level is set and recorded at
high fire, manually place the appliance into low fire
mode by pressing the service button “
” with “-”
button simultaneously on the control display once.
The control panel will display a L followed by the current
appliance temperature when placed into low fire test
mode.
5. If the combustion levels during low fire are not within
0.0 to 0.4% CO2 lower than the combustion level
measured at high fire, remove the offset pressure
cover screw and adjust the OFFSET SCREW using
a T15 Torx wrench as follows (see Figs. 3 & 4 on
page 5):
The OFFSET SCREW adjustment on the CHALLENGER’S gas
valve is very sensitive. A small adjustment will have a sig-
nificant effect.
Counter-clockwise adjustment of the OFFSET
SCREW at Low Fire:
O2 increases and CO2 decreases
Clockwise adjustment of the OFFSET SCREW at
Low Fire:
O2 decreases and CO2 increases
NOTICE
WARNING
NOTICE
WARNING
WARNING
Combustion Levels
Natural Gas
Propane Gas
H
ig
h
Fi
re
D
O
O
R
O
F
F
* CO2 Range
9% to 10.1%
10.5% to 11.1%
CO2 Target
9.0%
10.8%
O2 Range
3.0% - 5.0%
4.1% - 5.0%
O2 Target
5.0%
4.5%
Lo
w
F
ir
e
CO2 Range
0% - 0.4% < H.F
9.0% min.
0% - 0.4% < H.F
10.5% min.
O2 Range
0% - 0.6% > H.F
5.0% max.
0% - 0.6% > H.F
5.0% max.
CO Max.
100 ppm
150 ppm
* Door On can raise the maximum allowable CO2 by
0.4 or lower the minimum allowable 02 by 0.6.
