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The question is we have a balanced draft furnace in one of our projects. I understand...During start up the id fan is started first and then the fd fan. My question is in one of the projects I found that they were using the cold and hot air doors open condition near the fd fan to start permissive for cold start of a ID. In other project the hot and cold air open condition is permissive for cold start of fd fan. Please note both the projects mentioned above are balanced draft furnace. Kindly explain which of the above procedure or permissive is right.
Thanks and regards
Shirley
Thanks and regards
Shirley