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Throttle a
DJUSTMENTSCREW
nn
/.,9FORUSEBYAQUALIlEDTECHNICIANUSING
CALIBRATEDCOMBUSTIONTESTINSTRUMENTS
Part number 550-142-850/0115
69
FreeStyle
™
W
ALL
M
OUNT
GAS
-
FIRED
WATER
BOILER
—
Boiler Manual
28
6WDUWXS²¿QDOFKHFNV
(continued)
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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 fire. It should be within
VALUESFROMTHETABLEIN
Figure 95
4HEDIFFERENCE
OF#/
2
FROMHIGHlRETOLOWlRESHOULD
.%6%2
be below 0.2% or above 1%.
$/ ./4
attempt to adjust the throttle screw
unless by a qualified technician, and with the
USEOFCALIBRATEDCOMBUSTIONTESTINSTRUMENTS
Adjust the throttle screw only as needed to meet
the combustion values given in Figures 95 and
98, page 70.
!DJUSTINSTEPSOFNOMORETHANOFATURNAND
WAITMINUTEAFTEREACHADJUSTMENTTOALLOWTHE
SETTINGTOSTABILISE4URNINGTHESCREWTOOFARWILL
cause the adjustment to reverse behavior.
4. In the event that the CO
2
setting level with an acceptable
CO/CO
2
ratio cannot be obtained please contact your
Williamson-Thermoflo representative.
5. Should you require any assistance during the set up pro-
cedure contact your Williamson-Thermoflo representative
IFTHEPROBLEMCANNOTBEADDRESSEDWITHTHEINFORMATION
provided in this manual.
6. Remove T-40 cap, see Figure 96
BELOWFOR/FFSETSCREW
adjustment.
.ATURAL'AS!CCEPTABLE
#OMBUSTION2ANGE
-AXIMUM2ATEAFTERMINUTESFROMCOLD
Boiler Model
CO/(PPM)
CO
2
NG %
CO
2
LP %
&3
110
n
n
&3
110
n
n
Setting the Air/Gas Ratio valve
There are two adjustments possible on the air/gas ratio valve,
THE THROTTLE SETTING AT -AXIMUM RATE AND THE OFFSET SETTING AT
-INIMUMRATE)FEITHERSETTINGISADJUSTEDTHECOMBUSTIONVALUES
must be rechecked at both rates.
At Maximum Rate:
1. Adjust the boiler to maximum rate in Figure 92, page 66,
4EST-ODE
2. Wait 10 minutes to allow the boiler to stabilize.
3. Now adjust the Throttle setting (Figure 94 - screw A) until the
CO
2
ISATTHECORRECT3%44).',%6%,SEE
Figure 95), below
confirm that the CO/CO
2
ratio is within limits (clockwise to
increase gas).
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4CAPREMOVEDFORADJUSTMENT
4HROTTLEADJUSTMENT
SCREW
!
CO
2
Max. Regulating screw
Test at Max Power 100%
Turn clockwise (open gas)
IRU³0$;JDVÀRZ´
Turn counter-clockwise
(close gas)
IRU³0,1JDVÀRZ´