Master module for process control for R744 refrigeration plants
HCO2-G4_R.1.0.9_V8.1.4_PI_2018-12_EN
1
Subject to technical changes
HCO
2
-G4
1 HCO
2
-G4
Master module for process control of R744 refrigeration plants
1.1
Front view
Fig. 1: Front view of HCO
2
-G4
1.2
Features
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Simple start-up with parameter settings for the plants using default settings from the expert data-
base
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Connection of 12 field modules
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High and medium pressure control
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Gas cooler control
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Control and monitoring of 2 compressors (parallel compressors)
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Control of 3 fluid ejectors and 7 gas ejectors
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7-step sequence for heat recovery (HR)
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Calculation of the amount of heat recovered through HR
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Optional heat generation by heat pump evaporator
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Air conditioning operation by thermosiphon, high pressure or external MT cold location
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Start-up mode for initial installation and control circuit blocking for service operation
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Additional control circuits for collector fill level monitoring, LT pressure level, desuperheating,
post-injection, oil return
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Integrated relay outputs
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CAN bus connection by patch cable and push-in terminals
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Wurm G4 operating concept
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Innovative user interface with sticky keys
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Graphical display with backlighting, plain text, 6 operating keys, and 1 Info key
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Context-sensitive Help with links to the paperless info Wurm-App
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Direct navigation by Quicklink
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Fastening in the installation frame, or individual installation without frame
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Connection to the Wurm system through a Wurm CAN communication bus (C-BUS) and
FRIGODATA XP
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High level of safety with the galvanically isolated Wurm CAN field bus (F-BUS) which is used to
connect the field modules
