walk in cooler

[kc8939]

hi, i have awalkin cooler, the evap fans will not come on, the comp will start and run for about 5 min. then shuts down any ideals i did not put any gauges on yet. would the evap fans cause this unit too shut down?

[icemeister]

The evaporator fans on a typical walk-in cooler are suppose to run constantly as they are direct wired with no controls to shut them off. If your fans aren't running check for power and/or defective fan motors.

The compressor may cycle off as you describe if the box temperature is being controlled by the low pressure switch and no evap fans are running. If it's on a pumpdown cycle with a thermostat and LLS, then I'd say you have even more of a problem. :eek:

[kc8939]

thanks for reply, i have 1500 vending machines to take care of, and too have 2 walkins and a freezer i dont have a lot of time too check out all things right away like the BOSS thinks, he thinks 5 mins too check you should know all the answers i guess its the heat after 12hrs a day for 8 yrs. you start too slip a little. ken/pa

[kc8939]

hi, well today i found out why the evap fans would not come. their is a thermo switch mounted too the evap coil that was pulled off, as soon as i put this back in place the fans came on. is their a site where i can get a wiring diagram for a copeland unit three phase 208volt? thanks ken/pa

[icemeister]

Originally posted by kc8939
......their is a thermo switch mounted too the evap coil that was pulled off, as soon as i put this back in place the fans came on.

Are you saying there's a thermostat sensing coil temperature that's controlling the evaporator fans? If so, get rid of it and connect the fans direct to run constantly.

As for the Copeland info, go here (http://www.copeland-corp.com/). If you're not signed up, you'll have to register and possibly wait a day or so to get cleared......or go to your local Copeland PrimeSource Wholesaler and pick up a Copeland Electrical Handbook.

[danny x]

Perhaps it’s a freezer not a cooler and what the wires were pulled off of was a Defrost termination/Fan Relay To insure the fans come on after defrost and when the Evap coil drops temperature?

[kc8939]

yes this was a freezer, but is now used as a cooler thanks for web site ken/pa