True 72 cu. ft. / 2039 liter Commercial Freezer T-72F - Answered Questions & Fixed issues

Hello, their are heat coils in the doors, their maybe a issue with the door heat circuit controls.

FIXING COMMERCIAL TRUE AIR FREEZER

Head pressure should be around 250#.
Be sure condenser is clean. Use a good foaming cleaner.

Is it the defrost heater element? There are several possibilities. Check defrost timer operation and output, check overheat limit klixon (attached to evaporator), check heater continuity.

Commercial refrigerator parts supplier can make it same day. Check google for your nearest supplier.

Would take more time and money than buying a T-72F freezer.

right side of the evap. coil housing inside.

You have done good work here young man. There is a relay or switch that is keeping the signal for being processed. I had the same similar problem with mine. At least your compressor is ok. Are you sure timer is wired back right.

Here is a PDF of Techinical information for all models of the True T-72F I will be here later should you have questions, Thanks Sea Breeze

I need A wire diagram for a freezer mo.49f

Check the defrost timer (in the base, circular knob you can turn till it clicks) If it doesn't heat up rapidly in the evaporator, there is a safety overheat device (thermistor) that may be cutting power to the heater, or there may be a fault with the heater itself. Are you sure the fans are working, and the condenser grill is nice and clean?

P1 is almost always a fault on the sensing (control) probe. Check it's end is not wet or covered in thick ice, and check the connections at the controller. If you can, change the probe connections on the controller temporarily. If P2 then shows it proves the probe is faulty. If P1 still shows, it proves the controller is at fault.

If it's mounted inside a box along with the capacitors there is 1 screw holding it from the back. Often you have to unmount the box from the compressor to access the screw.

evap fans will run continuiously on this unit,it is normal. fans stay on to circuilate air evenly inside unit.

Possible defrost termination switch. It is mounted by the evaprator and has 3 leads coming off of it. Possibly red, brown and black.

Verify that the sensing bulb on the thermostat is inserted INTO the evaporator coil.

Usually a hot frame is an indication that the condenser grill needs cleaned.

This could be a bit tricky,
First you need to identify the kind of door switches, there are 3 basic types

1. 2 tags or terminals with 1 common and either 1 normally open or 1 normally closed contact

2. 3 tags or terminals with 1 common and both 1 normally open and 1 normally closed contacts

3. 4 tags or terminals with 2 common and both 1 normally open and 1 normally closed contacts

If you are fairly competent with wiring then you should be able to decide which of the drawings below suits you. But PLEASE switch it off and unplug it before working on the unit. Hope you find this helpful

Gordon

Coil must be cold enough for the fan delay to turn fans on. If it is and no fans replace delay

One easy thing you can do is check the fans around the condenser.
Then sweep out all the dust that would restrict air and cause poor performance. If you need further help, reach me via phone at https://www.6ya.com/expert/dan_73bbd84fe1d95b61