3 System Design of UA 4xx E
Figure: UA 410 E AC - full configuration
3.1 Application
The use of the case controller UA 4xx E for electronic expansion valves provides decisive advantages thanks to
a reduced pressure difference between the high and low pressure sides, low superheat at the evaporator as
well as constant conditions for the goods and evaporator thanks to continuous regulation. The adaptive suction
pressure control generates further savings potential thanks to the load independent increase of the suction
pressure. A range of functions for cost and energy saving such as defrost on demand, latent heat utilisation,
intelligent fan control, enthalpy controlled frame heater and the continuous temperature control of the goods are
available with this case controller.
The case controller is suitable for control and monitoring in refrigerated cases and cold rooms for normal-
temperature refrigeration, low-temperature refrigeration (NT/LT), cascade controllers* or sub coolers*. The
appropriate controller type for multidecks, refrigerated counters, freezer islands, freezer rooms etc. can be set
easily using the DIP switches on the controller. The factory settings for the desired application that have been
tried and tested in practical use are then loaded.
The UA 4xx E case controller is available in the variants UA 401 E CC / UA 400 E CC / UA 410 E AC. The two
UA 400 E CC / UA 410 E AC case controllers support single-zone and two-zone operation. The UA 410 E AC
supports the controller types UK 100 E sub cooler and KR 160 E cascade controller. The UA 401 E CC variant
only supports one temperature zone.
UA 401 E CC UA 400 E CC * UA 410 E AC
(complete design)
Single-zone operation Single-zone operation
Two-zone operation
Single-zone operation
Two-zone operation
Standalone operation
- - Sub cooler and cascade controller
For more details, see chapters Hardware, Versions,Controller types and Temperature zones.
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