carrier compressor alarms

[sabre11134]

having a problem with circuit A compressor A-2& A-3 with nusiance compressor failure alarms. Checked input on exv board & mbb board could see voltage bouncing. in the past you could buy a kit with stronger contact tension. Would any body know if this kit is still available. And if still available could you furnish me the carrier part number. Chiller 30gtn150 4-5 years old Here in florida we are so lucky to get a call center to order parts.

[djken]

If you are experiencing T051-055 alarms then you probably need to install the current sensing boards. Kit part number 30GT-911-086. You will need to get with your local distributor because they will need to "smartload" upgraded software to the MBB.

[airworx]

its been about a yr since ive worked on these and dont have the book with me but t51-t55 i thing means compressor shut down becuase of high head pressure, high discharge temp,
more than 2 amps to ground and something else and if so you need to check the hps, dts, compressor protection board.

[cvw]

sabre11134

If this unit has CGF boards for pump protection Carrier has a service bulletin SMB 01001. This Mod reduces the sensitivity of the toroids by puting two 5K ¼ watt resistors, one in series with each wire coming from the toroids, put these resistors close to the CGF board.

Does this unit use the FloTronic computer board ?

cvw

[sabre11134]

this unit has comfort link controls.pumps are not controlled by unit

[djken]

What alarm are you getting?

[just_opinion]

I am too curious about what type of alarm does the chiller has before we jump the gun

[sabre11134]

alarm 52 & 53 compressor a2 & 3 failure, This is my first visit to bldg. customer has been getting the alarms for some time.

[djken]

If you follow what I said in my earlier post, your alarms will disappear.(provided the rest of the system is operating properly)

[just_opinion]

Sabre11134

When the CGF or CPCS (compressor protection control module)gives the fault signal, it has a red light glowing. If the light is not glowing when you have these faults, then it is not the CGF.

Further more, if you look closely at the wiring diagram, you will see that circuit A2 and A3 don't have CGF or CPCS Unless it has been modified). Instead there is only the HPS to cause thesse two codes.


If NOT the CGF then I would go for the clear plastic relay labeled CRA2 and CRA3 they are prone to have nuisance problem. My recommendation is to swap them with circuit B, which you know working properly.

Other thing to check for is the high pressure switch. It maybe weak. And other thing you must pay attention to is your charge. If the circuit is over charge, you will tend to have niusance trip since the sensor measuring the liquid line too low and the systems shuts down you fan on mild weather day. This will cause the unit to shut down on high head. But I don't think this is your problem since circuit A1 did not trip.

Another problem is that the MAIN BOARD is bad by not sending the CR signal or it does not see the signal feeding back from your CR relay to let it know that yes you compressor is running. BUT this problem is very remote and the board is TOO EXPENSIVE to fail prematurely versus the relay

Good luck

Good luck

[chilbrig]

You would be a lot better off if the chiller controlled the chill water pump.