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myson velaire 50/70 boiler?

have set up as per the original manual.co2 10.51%,150 psi,air damper no.5 but flue gas temp. very high, 431 deg c vs 300 in manual.any suggestions to explain/correct the difference?
roy arthurton, March 2010
my myson velaire keeps on locking out when she is warm, keeps working for about 20 min then locks out, ive checked the carbon spacer between pump and motor but its not cracked, spins around ok

peter, November 2011
what width of flue is required

d. maidment, January 2011
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