The Building is Hot, and I Need My Chiller Back Online

This is not a fun phrase to hear when you talk to the customer on-site. It gets worse when you open the panel door and see the Comfort link panel flashing. This can be a touch overwhelming but let’s drive forward into the problems and see what the machine is doing.

The Comfort link board shows codes T134, T113 and T093. The First Code is Circuit B Low Suction Pressure. This code will show if the suction pressure on the circuit is below 23 psiq. The Second Code Circuit B loss of Charge, This code will show if the Suction and Discharge pressures are under 26 psig. The Final Code is Circuit B Suction Pressure Transducer Failure, This code comes on when the suction pressure is outside of the range. Looking at the codes it’s very clear after putting gauges on the circuit to confirm there is no gas in circuit B. This will be the method of getting A circuit back online.

Procedures for getting the chiller back online

1. Turn the SW1 switch to the center position. This allows the MBB to take the commands without having a moment of issue.
2. Go to the configuration menu on the Comfort link. Then go down to the SERV
3. Select enter and go down to EN.B1 and disable the remaining B circuit Compressors depending on the size of the chiller.
4. Take the Suction pressure transducer off the pipe. It is located next to the B1 compressor.
5. Take the Circuit B Discharge Transducer off the pipe it is located behind the compressors on the Discharge header.
6. Using your Gauges Thread the Suction transducer on the low side line. Then thread the discharge to the high side of your gauges. Using a refrigerant gives the 2 transducers about 145 PSIG.

Once Completed go into the alarm menu to reset the alarms. This will allow the machine to run on A Circuit when B is down. This is a great tip when you run into a jam on this particular style chiller to get supplement cooling back into the space