Posted by MarkB_MI on October 09, 2021 at 17:04:36 from (174.211.38.233):
In Reply to: Re: Home HVAC unit posted by Roger Tomfohrde on October 09, 2021 at 09:04:05:
> I feel I need to address the black mold statements and then some of the other comments both good and bad. Black mold occurs when the unit is(choose one or more). Unit not sitting so condensation is draining out the back, drain plugged, excess humidity range(way in excess of 65% when not in operation), not being cleaned, outside air vent open allowing outside air to come in, outside drain plugged so over flow fills inside pan.
None of those conditions were present with our system that had a mold problem, with the exception that it was never cleaned. Note that it took about eight years for the buildup to get bad enough to require service. Had I known to clean it every year there would have been no need for a service call.
I suspect the main reason mini-splits are susceptible to this problem is their blowers suck through the evaporator coils, so the blower will tend to pick up moisture.
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