Commercial Refrigeration Mystery

fridg

Well i have recieved a fridge on R134a ,Fan forced evap
induced fan condenser. It is a commercial shop fridge.

It is a project at home, i want to fit schraders and service valves to the system to read pressures at different points at different loads.(yes i am in the trade)

Any thoughts where you would put them ?

ANY IDEAS ?

No it is not a household fridge it is a display cabinet from a shop.

Also i work in the manufacturing of like cabinets so parts are dirt cheap.

So come on guys throw your ideas at me
i need inspiration



I'm thinking on the same lines as you have 4 or 5
different systems in the 1 !

Tx, cap tube, float type controls.
the later being hard as it has no bore but maybe, used in conjunction with a reciever it might work.

A control to isolate different parts of the system (eg)(compressor,fans,flow controls,lights,relays)

Also maybe a series of sight gl***es in the evap and condenser to show the flashing off of the refrigerant.


2nd year apprentice .

__________________
The primary function of the design engineer is to make things difficult for the fabricator and impossible for the serviceman.

Bestheating

I am not sure what your goal is, but I too like to experiment. In refrigeration, remember that pressures are a guide, to let you think you are getting close. If you really want to know whats going on, learn the refrigerants temperature at given points. Understand your subject refrigerants characteristics and properties at a given time in the system. Only later, add in your load with some variables, humidity and vary the ambient air temperature. It will go a long way in your understanding of why we have so many refrigerants.

As a given, since you are going to be breaking into the system, make sure to evacuate the system well and use fresh refrigerant. God only knows what someone may have done to this system to mess it up...And that starts at the factory!

rabadger

In different factory schools I have seen the systems tapped at the following locations

Hot gas discharge (right before the condensor header. You may just want to install a high side gauge.)

liquid line just after the condenser coil

liquid line just before and after drier

liquid line just before metering device

suction line just after the evaporator.

suction line just before and after the suction line filter

suction line before the compressor.

You should be able to check subcooling, super heat, pressure drops.

Is that what you want to do?

__________________
Richard