Freestyle 80 - Page 73

&IGURE Throttle aDJUSTMENTSCREWnn
/.,9FORUSEBYAQUALIlEDTECHNICIANUSING
CALIBRATEDCOMBUSTIONTESTINSTRUMENTS
Part number 550-142-850/0716
73
FreeStyle
®
WALL MOUNT GAS-FIRED WATER BOILER — Boiler Manual
28 (continued)
Figure 98 -AXIMUM 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
VALUESFROMTHETABLEINFigure 984HEDIFFERENCE
OF#/
2
FROMHIGHlRETOLOWlRESHOULD.%6%2
be below 0.2% or above 1%.
$/ ./4 attempt to adjust the throttle screw
unless by a qualified technician, and with the
USEOFCALIBRATEDCOMBUSTIONTESTINSTRUMENTS
!DJUSTTHETHROTTLESCREWONLYASNEEDEDTOMEET
the combustion values given in Figures 98 and
101, page 74.
!DJUSTINSTEPSOFNOMORETHANOFATURNAND
WAITMINUTEAFTEREACHADJUSTMENTTOALLOWTHE
SETTINGTOSTABILISE4URNING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-Thermoflo representative.
5. Should you require any assistance during the set up pro-
cedure contact your Williamson-Thermoflo representative
IFTHEPROBLEMCANNOTBEADDRESSEDWITHTHEINFORMATION
provided in this manual.
6. Remove T-40 cap, see Figure 99BELOWFOR/FFSETSCREW
adjustment.
.ATURAL'AS!CCEPTABLE#OMBUSTION2ANGE
-AXIMUM2ATEAFTERMINUTESFROMCOLD
Boiler Model
CO/(PPM) CO
2
NG % CO
2
LP %
&3
  n   n 
&3
  n   n 
&3
  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
-INIMUMRATE)FEITHERSETTINGISADJUSTEDTHECOMBUSTIONVALUES
must be rechecked at both rates.
At Maximum Rate:
1. !DJUSTTHEBOILERTO MAXIMUMRATEIN Figure 95, page 70,
4EST-ODE
2. Wait 10 minutes to allow the boiler to stabilize.
3. Now adjust the Throttle setting (Figure 97SCREW!UNTILTHE
CO
2
is at the correct SETTING LEVEL (see Figure 98), below
confirm that the CO/CO
2
ratio is within limits (clockwise to
increase gas).
Figure 99 4CAPREMOVEDFORADJUSTMENT
4HROTTLEADJUSTMENT
SCREW
!
CO
2
Max. Regulating screw
Test at Max Power 100%
Turn clockwise (open gas)

Turn counter-clockwise
(close gas)
