Walk in freezer not restarting after defrost

[phxjersey]

i HAVE A WALKIN FREEZER COMPRESSOR THAT WILL NOT RESTART AFTER DEFROST CYCLE,, IN WHICH WE HAVE TO MANUALLY PUSH BUTTON ON SMALL RECTANGLE METAL BOX NEAR THE FAN,, THIS SEEMS TO ONLY HAPPEN WHEN IT IS WARM OUTSIDE, DURING THE COOLER MONTHS, IT DIDNT HAPPEN, BUT NOW AS IT IS HEATING UP,,THIS PROBLEM IS OCCURING...

[chemi-cool]

MANUALLY PUSH BUTTON ON SMALL RECTANGLE METAL BOX NEAR THE FAN,,

Its called High\Low pressure control with manual reset.

You need the advice of a professional refrigeration engineer to check it and see what makes it trip after defrost.

[nike123]

High evaporator load after defrost trips that switch.
Therefore some electronic controllers have function to stop fan after evaporator temperature reach 2°C or more.

What controller is there?

[goshen]

Its called High\Low pressure control with manual reset.

You need the advice of a professional refrigeration engineer to check it and see what makes it trip after defrost.
Hi you got some good advice here you should follow up before some significant damage will be caused!:)

[mork]

Hi! I'd definitely get a fridgie in to give it the once-ova. In the old days a crank-case pressure regulating valve helped lower pressures after a defrost (secondary to reducing compressor load), but with most small systems these days with solenoid pump-down and a fan delay after defrost it's not really necessary. Goood Luck! :D