WURM HCO2-G4 Quick Start Manual

1 HCO -G4
2
Master module for process control of R744 refrigeration plants
1.1

Front view

Fig. 1: Front view of HCO -G4
2

1.2 Features

• Plant-specific installation of control circuits
• Start-up support with special start-up mode
• High pressure control and medium pressure control with up to 2 valves
• Analogue gas cooler control or via Modbus interface in 2 groups with functions for cleaning, addi-
tional cooling, emptying and sub-area shutdown
• Refrigerant level monitoring in collector and MT/LT separators with level switches or filling level
probes, flooding of MT and LT cold locations
• Oil return and oil pressure control
• Compressor protection via load shedding
• Liquid injection and hot gas bypass with optional partial load reduction
• Parallel compression with 1 modulating and 3 multi-step compressors, load shedding
• Ejector operation for Wurm ejectors: gas (3 x modulated) and liquid (1 x modulated) incl. control
of the valves mounted on the suction side
• Air conditioning at medium pressure level with pump control incl. safety functions
• Heat recovery:
Up to 2 heat recovery units, 7-stepped sequences for desuperheating, power increase, GC fan
speed reduction, GC bypass, GC heat pump, 2 external heat sources
• Heating up operation with optional reservoir control (electric heating element, pumps)
• Heat pump control:
1 GC heat pump and up to 2 external heat pumps in the refrigerant circuit at MT 1, MT 2 or LT
level including defrost, outside temperature-controlled rack shift and optional compressor decou-
pling in heat pump operation
• Can be locked to prevent unwanted parameter adjustment (SAC – Security Access Control)
• CAN bus connection by patch cable and push-in terminals
• Wurm G4 control concept and innovative user interface with 1-finger operation
• Graphical display with backlighting, plain text, 6 operating keys, and 1 Info key
• Context-sensitive Help with links to the paperless info Wurm-App
• Direct navigation by Quicklink
• Fastening in the installation frame, or individual installation without frame
• Connection to the Wurm system via Wurm CAN communication bus (C-BUS) and
FRIGODATA XP
HCO2-G4_V8.5.0_PI_2022-08_EN
Master module for process control of R744 refrigeration plants
Subject to technical changes
HCO -G4
2
1