Dear All, This is in response to the discussion thread on blocked vents. Based may years experience as a product safety engineer, blocking all vents DOES NOT always yield the worst case results. In some situations, when all vents are blocked, a sensor in the secondary immediately operates and disables the power supply load. In such a situation, blocking a only a single set of vents might yield worse case results since the sensor may not have responded immediately or may not have responded at all yielding higher temperatures on critical insulation.
What I am trying to state here is that when doing abnormals, one has to start thinking logically including reading the user instructions, installation instructions and maintenance instructions. We must act as safety engineers and not repeat errors of inexperienced engineers. Go over your Listing Procedures and check your Test Records - you will note that many of the abnormals were terminated in 30 minutes or less because constant temperatures have reached - of course since the unapproved sensor in the secondary operated when blocking all of the ventilation openings. The safety engineer in this case did not put much thought in conducting the abnormal test. The other issue is the unapproved sendor in the secondary. Since it is unapproved, would defeating the sensor during the blocked ventillation or disconnect fan test be justified? I will let everyone think and give thri thought in this great forum. Happy Holidays and Do not Block Your Chimneys - Santa must find his way through! _____ Do you Yahoo!? Free Pop-Up Blocker - Get it now <http: /us.rd.yahoo.com/slv/mailtag/*http://companion.yahoo.com/>
