4.2 Controller types
Case controllers for refrigeration points with thermostatic expansion valves contain a range of different
controller types with different fields of application which are summarised as follows:
Controller type Applications
Case
contr
oller
UA 111 Multidecks without defrost heater
UA 111 D Multidecks without defrost heater with twin compressor pack
UA 121 Normal temperature (NT) refrigeration (multidecks, islands, chests, counters) with defrost heater
UA 131 without fan
control
UA 131 with fan
control
Low-temperature (LT) refrigeration (islands, chests, cabinets, freezer set) with defrost heater, NT cases
with defrost heater
UA 131 LS with
enhanced fan control
Low-temperature (LT) refrigeration (islands, chests, cabinets, freezer set) with defrost heater, NT cases
with defrost heater
UA 131 DD The controller type has been specially developed for use in refrigerated cases that are operated on a
refrigeration pack system with 2-pipe hot gas defrost. Since version V2.20, it has replaced the controller
type UA 131 A that was suitable for LT islands with twin compressor pack.
UA 141 Service counters without defrost heater
Cold
room
contr
oller
UR 141 NK NT cold rooms with / without defrost heater
UR 141 TK NT / LT cold rooms with / without defrost heater and hot gas defrost
For definition of the basic control action, only one controller type can be set, which is set using the DIP
switch S3:
Special feature: Two device generations are available. The DIP switch S3 provides a quick distinguishing
feature:
2nd generation controller
(from Oct. / Nov. 2018)
1st generation controller
(since 2011)
Characteristic: 9-pole DIP switch Characteristic: 8-pole DIP switch
Example: Setting of the coding switches for the controller type UA 131 E; for details, see chapter Setting of the
controller type and master/slave mode.
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