Catalogue

60 CG-PRC017H-EN
Mechanical Specifications
Capacity modulation is achieved by turning compressors on and off. The 20-35 ton units have two
capacity stages. The 40-120 ton units have four capacity stages.The 130 ton unit has six capacity
stages.
Unit Controls (Trane CH530)
The microprocessor-based control panel is factory-installed and factory-tested.The control system
is powered by a pre-wired control power transformer, and will turn on and off compressors to meet
the load. Microprocessor-based chilled water reset based on return water is standard.
TheTrane CH530 microprocessor automatically acts to prevent unit shutdown due to abnormal
operating conditions associated with low evaporator refrigerant temperature and high condensing
temperature. If an abnormal operating condition continues and the protective limit is reached, the
machine will shut down.
The panel includes machine protection for the following conditions:
• Low evaporator refrigerant temperature and pressure
• High condenser refrigerant pressure
• Critical sensor or detection circuit faults
• High compressor discharge temperature (with low temp evaporator)
• Lost communication between modules
• Electrical distribution faults: phase loss, phase reversal or over temperature protection
• External and local emergency stop
• Loss of evaporator water flow
When a fault is detected, the control system conducts more than 100 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.
Clear Language Display Panel
Factory-mounted to the control panel door, the operator interface has an LCD touch-screen display
for operator input and information output.This interface provides access to the following
information: evaporator report, condenser report, compressor report, ASHRAE Guideline 3 report,
operator settings, service settings, service tests, and diagnostics. All diagnostics and messages are
displayed in “clear language.”
Data contained in available reports includes:
• Water and air temperatures
• Refrigerant pressures and temperatures
• Flow switch status
• EXV position
• Compressor starts and run-time
All necessary settings and setpoints are programmed into the microprocessor-based controller via
the operator interface.The controller is capable of receiving signals simultaneously from a variety
of control sources, in any combination, and priority order of control sources can be programmed.
The control source with priority determines active setpoints via the signal it sends to the control
panel. Control sources may be:
• Local operator interface (standard)
• Hard-wired 4-20 mA or 2-10 Vdc signal from an external source (interface optional; control
source not supplied)
• Time of day scheduling (optional capability available from local operator interface)