Specifications

62
11) Performacombustiontest.Boilersequippedwithaconcentricventsystemhaveauegassampletaplocatedinthe
boilerventcollar(underthescrewcap).Forotherventsystems,thesampleprobemaybeinsertedintotheterminal.
Ifthisisnotpossible,removetheuetemperaturesensorandinserttheanalyzerprobeinthesensoropening.Forthe
boilertooperate,thissensorwillneedtoberemainconnectedtothewiring.Iftheuegassensorisremoved,besureto
replaceitaftercombustiontestingiscomplete.
 CheckCO
2
(orO
2
)andCOatbothhighandlowre.Theboilermaybetemporarilylockedintohighorlowrefor15
minutesasfollows:
a) Tolocktheboilerinhighre,simultaneouslypressandholdthe“Mode”buttonand“+“buttonuntilthedisplay
ashes“H”,indicatingthattheboilerhasbeendriventohighre.Afterthishappens,allowtheboilertooperatefor
approximately5minutesbeforetakingcombustionreadings.
b) Tolocktheboilerinlowre,simultaneouslypressandholdthe“Mode”buttonand“-“buttonuntilthedisplay
ashes“L”,indicatingthattheboilerhasbeendriventolowre.Afterthishappens,allowtheboilertooperatefor
approximately5minutesbeforetakingcombustionreadings.
c)Normalmodulationoftheboilershouldreturn15minutesaftertheboilerislockedinhighorlowre.
 Atbothhighandlowre,COreadingsshouldbelessthan75PPM.TypicalCO
2
readingsareshowninTable11.3.
Figure 11.2: Gas Valve Detail
Model Fuel %CO
2
%O
2
FCM070 Natural Gas 9.4 4.4
FCM070 Propane 10.4 5.1
FCM090 Natural Gas 9.5 4.3
FCM090 Propane 10.5 5.0
FCM120 Natural Gas 9.5 4.3
FCM120 Propane 10.5 5.0
TABLE 11.3: TYPICAL CO
2
/O
2
COMBUSTION
READINGS