Freestyle 2 Series - Page 82

Figure 106 Throttle adjustment screw ––
(ONLY for use by a qualied technician, using
calibrated combustion test instruments).
Part number 550-142-950/0122
82
FreeStyle
®
series 2 wall mount gas-fired water boiler – boiler manual
33 Startup — nal checks (continued)
Figure 107 Maximum rate combustion values –
measured values must be within the ranges
given below
Using a combustion analyzer check the CO
2
values at low and high re. It should be within
values from the table in Figure107. e dier-
ence of CO
2
from high re to low re should
NEVER be below 0.2% or above 1%.
DO NOT attempt to adjust the throttle screw
unless by a qualied technician, and with the
use of calibrated combustion test instruments.
Adjust the throttle screw only as needed to meet
the combustion values given in Figure107 and
Figure110,page83.
Adjust in steps of no more than 1/8 of a turn and
wait 1 minute aer each adjustment to allow the
setting to stabilise. Turning the screw too far will
cause the adjustment to reverse behavior.
4. In the event that the CO
2
setting level with an acceptable
CO/CO
2
ratio cannot be obtained please contact your
Williamson-ermoo representative.
5. Should you require any assistance during the set up pro-
cedure contact your Williamson-ermoo representative
if the problem cannot be addressed with the information
provided in this manual.
6. Remove T-40 cap, see Figure108, below, for Oset screw
adjustment.
Natural Gas/LP Acceptable Combustion Range
Maximum Rate after 10 minutes from cold
Boiler Model CO/(PPM) CO
2
NG % CO
2
LP %
FS-80
110 9.0 – 9.5 10.2 – 10.7
FS-120
110 9.0 – 9.5 10.2 – 10.7
FS-155
120 9.0 – 9.5 10.2 – 10.7
Setting the Air/Gas Ratio valve
ere are two adjustments possible on the air/gas ratio valve,
the throttle setting at Maximum rate and the oset setting at
Minimum rate. If either setting is adjusted the combustion values
must be rechecked at both rates.
At Maximum Rate:
1. Adjust the boiler to maximum rate in Figure104,page79,
Test Mode.
2. Wait 10 minutes to allow the boiler to stabilize.
3. Now adjust the rottle setting (Figure106 - screw A) until
the CO
2
is at the correct SETTING LEVEL (see Figure107),
below conrm that the CO/CO
2
ratio is within limits (clock-
wise to increase gas).
Figure 108 Remove T-40 cover cap with supplied Torx
wrench for adjustment
Throttle adjustment
screw
A
CO
2
Max. Regulating screw
Test at Max Power 100%
Turn clockwise (open gas) for
“MAX gas ow”
Turn counter-clockwise
(close gas)
for “MIN gas ow”
Rough start point
For LP Start up ONLY
Adjust gas valve
HIGH FIRE
screw on right with
Allen wrench turn
Counter-Clock wise
1-1/8 turns.
Final Combustion values
MUST BE checked with
Combustion Analyzer.