diesel tech

[Rafael valenzue]

:eek:i am a new member and i am working on a trailer with thermoking that on the frame of the thermo has marked one refrigeration R502 and in front of the engine has R402a sticker which one is inside some body can tll me how to know which one is inside appreciate yor help thanks

[malkiaizrod]

it must br r402 because it replace r502

see dupont refrigerants

[Rafael valenzue]

thanks for for the help are you malkiaizrod? also another question, the relay board burned up and i would like to know if you have an idea what could have cause the problem the refrigerant level is low i can see the sight glass ball barely moving somebody already replaced the compressor and the service valves look like they are leaking because they have some oil around nice meeting you thanks for the answeri will check at dupont and see you later bye.

[malkiaizrod]

If You send me unit model on Monday i can send You el.schematic about relay burning. If You send me cables names maybe i have idea. About refrigerant level wait till forgone temp. is lower than 5 degree cels. If this is not possible You must evacuate system, vacuum and charge with ref. exact amount. Of course first You must be sure about leakage. Best way is when evacuate the system to test with N2 20Bar and lather. If unit is old clean carefuly condenser.

[Rafael valenzue]

Malkiaizrod i got your anzwer i send you the model # is SB111 SR srmp4 B/M #048333 S/N 0636305718 i appreciate if you send me the schematic the relay board is the only thing burned out behind the relay board at the bottom of relay board there is a little circuit that burned some other mechanic run it direct probably because it was shutting down anyway on monday i ll send more info i dont know how you can send me the shematic i see you have a lot of experience if i need to replace the relay borard what kind you recommend me thanks again see you on monday

[malkiaizrod]

it must be SB III SR

[malkiaizrod]

what is exactly burned. if you want more help send photo

[malkiaizrod]

I found sch for SB III 50 SR
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