![Mechanical Specifications](/images/new-backgrounds/66222/6622275x1.webp)
Mechanical Specifications
General
All scroll chillers are factory tested and monitored for power and control operation (CGWF only). CGWF units ship with a full operating charge of refrigerant and oil. CCAF units ship with a full operating charge of oil. Exposed surfaces are painted with an
Compressor-Motor
Motor is suction
Evaporator
Shell and tube design with seamless copper tubes roller expanded into tube sheets. Designed, tested and stamped in accordance with ASME Code for refrigerant side working pressure of 300 psig. Water side working pressure is 300 psig for CGWF
Condenser (CGWF only)
Shell and tube design with seamless internally enhanced copper tubes. Designed, tested and stamped in accordance with ASME Code (CGWF 60 only) the refrigerant side working pressure of 450 psig. Water side working pressure is 300 psig for CGWF
Refrigerant Circuit
Each refrigeration circuit shall be completely independent and shall include liquid line and discharge line service valves, filter dryer, combination moisture
Isolation valves provide means of isolating refrigerant charge in either the high or low pressure side while servicing. One refrigerant circuit on
20 to 30 tons; two refrigerant circuits on
40 to 60 tons.
Condenserless units (CCAF) shall be equipped with discharge check valve and moisture indicator sightglass.
Unit Controls (CH530)
The
The CH530 microprocessor automatically acts to prevent unit shutdown due to abnormal operating conditions associated with low evaporator refrigerant temperature, high condensing temperature, and/or motor current overload. If an abnormal operating condition continues and the protective limit is reached, the machine should shut down.
The panel includes machine protection shutdown requiring manual reset for the following conditions:
•low evaporator refrigerant temperature and pressure
•high condenser refrigerant pressure
•critical sensor or detection circuit faults
•motor current overload
•high compressor discharge temperature
•lost communication between main processor and LLID
•electrical distribution faults: current loss or phase reversal
•external and local emergency stop
•starter contactor interrupt failure
The panel also includes machine protection shutdown with automatic reset for the following correctable conditions:
•power loss
•loss of evaporator or condenser water flow
When a fault is detected, the control system conducts more than 60 diagnostic checks and displays results. The display will identify the fault, indicate date, time, and operating mode at time of occurrence, and provide type of reset required and a help message. The diagnostic history will display the last ten diagnostics with their times and dates of occurrence.
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