Carrier PIC 5+, Installation, Operation And Maintenance Instructions

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Fig 51
– Effect of surge line speed factor on Surge prevention
7. OPERATING INSTRUCTIONS
7.1 operator duties
1. Become familiar with the chiller and related equipment before operating the chiller.
2. Prepare the system for start-up, start and stop the chiller, and place the system in a shutdown condition.
3. Maintain a log of operating conditions and document any abnormal readings.
4. Inspect the equipment, make routine adjustments, and perform a Control Test. Maintain the proper refrigerant
levels.
5. Protect the system from damage during shutdown periods.
6. Maintain the set point, time schedules, and other PIC5+ functions.
7.2 to start the chiller
1. Start the water pumps, if they are not automatic.
2. Press the Start/Stop icon on the HMI home screen to start the system. If the chiller is in the OCCUPIED mode
and the start timers have expired, the start sequence will start. Follow the procedure described in the Start-
Up/Shutdown/ Recycle Sequence section.
7.3 Check the running system
After the compressor starts, the operator should monitor the display and observe the parameters for normal
operating conditions:
1. The normal bearing temperature should be about 35°C. Alert will initiate at (40°C and Alarm will be initiated at
50°C.
2. The First Stage and Second Stage Bearing Temperatures can be accessed from the Temperatures menu. If the
bearing temperature is high or in Alarm/Alert state with the refrigerant pump running, stop the chiller and
determine the cause of the high temperature. Do not restart the chiller until corrected.
3. The liquid level sensor on the condenser float chamber should indicate Closed in the INPUT menu.
4. The bearing pressure drop should exceed 90 kPa when the compressor is ON, as seen on the HMI
Transmission Status screen. If not an alert will be generated. Typically the reading will be slightly lower at initial