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6.12 Requirements for elastomeric seals and elastomeric sealants in the combustion product evacuation ducts, terminals and fitting pieces
7.5.7.5 Nominal working combustion products temperature
During the control thermostat tests, according to 7.5.7.2.1, with the thermostat set at the maximum setting temperature, the temperature of the combustion products is recorded continuously until the thermostat operates.
The nominal working combustion products temperature is determined.(
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A timepiece is fitted to the ambient temperature thermostat to obtain a working cycle of 10 minutes.
7DEOH&DOFXODWLRQRIWKHXVHIXOSDUWORDGHIILFLHQF\ Conditions of operationHeat inputCycle time (s)Meas.Useful efficiency (%) 130% reduced rateQ2 = 0,3ã Qnt2 = 600ẵ2ẵu = ẵ2 Q1 = Qn1)ẵ1 Controlled offQ3 = permanent ignition burnert3 = 600 – t1Ps Q21 > 0,3ã Qnẵ21 Controlled offQ3 = permanent ignition burnert3 = 600 – t21Ps Q1 = Qn1)ẵ1 Reduced rateQ22 < 0,3ã Qnt22 = 600 – t1ẵ22 5 Reduced rate 1Q21 > 0,3ã Qnẵ21 Reduced rate 2Q22 < 0,3ã Qnt22 = 600 – t21ẵ22 6Full rateQ1 = Qn1)t1 = measured value (see annex Q)ẵ1 Reduced rateQ2ẵ2 Controlled offQ3 = permanent ignition burnert3 = 600 – (t1 + t2)Ps 1)Qn is replaced by the arithmetic meanQa of the maximum and minimum heat input for range-rated boilers.
t1 180 Q1 600 Q3– Q1Q3–--------------------------------------= ẵu
ẵ1 100--------Q1t108,Q3t3Pst3–+ Q1t1Q3t3+--------------------------------------------------------100ì= t21 180 Q 21 600 Q 3– Q21Q3–-----------------------------------------= ẵu
ẵ 21 100--------Q21t2108,Q3t3Pst3–+ Q21t21Q3t3+-----------------------------------------------------------100ì= t 1 180 Q1 600 Q22– Q1Q22–---------------------------------------= ẵu
ẵ1 100--------Q1t1ẵ22 100------ ⎝⎠⎛⎞Q22t22+ Q1t1Q22t22+---------------------------------------------------100ì= t21 180 Q21 600 Q22– Q21Q22–------------------------------------------= ẵu
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2 Full rate 3 Reduced rate 4 Full rate
BS EN 483:1999+A4:2007 © BSI 2008
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