I have an evaporator coil that is frosting up around the front of the coil in behind the fans. It is frosting up bad, thick frost that builds up in behind the fans all the way across. It's a small Keeprite coil, 12,000 btu/hr, low-temp (0F), outdoor condensing unit. Paragon mechanical time clock, four 40 minute defrosts/day (electric) with termination and fan delay. Back of the coil defrosting great. 4 fan unit.
So far I've checked
- position of fan blades in shrowd
- tested time clock
- tested termination
- tested fan delay
- checked evap motors and rotation
- checked refrig charge
I completely defrosted approx 3 weeks ago, customer says it is now frosted again. The location is out of town so i would like to go back with a plan.
When I return, I intend on checking:
- monitoring defrost cycle
- increasing defrost time?
- increase number of defrosts/day??
Any other ideas? At the moment unfortunately I do not have the model and serial number of the equipment, I have called the customer and am awaiting a return call with that information and when I get it, I will post it.