ECKELMANN Case Controller UA 4 E Series - Continuous Temperature Control by Supply and Return Air Temperature

Firmware V3.13
21.04.2021
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5.7.3 Continuous temperature control by supply and return air temperature
Controller types UA 121 E, UA 131 E, UA 141 E
Control is made by two temperature sensors (supply air or return air sensor of pilot case). Cooling can take
placeinsingle-zoneortwo-zonemode.Insingle-zonemode,sensorsRy.1actonbothrelays1and2ofthe
expansionvalves.Thetworelaysareactuatedatseparatetimes(seeSectionTwo Temperature Zones).
R2.1: Supply air sensor (Terminal Z11/12)
R4.1: Return air sensor (Terminal Z21/22)
R5.1: Evaporator inlet sensor (Terminal Z41/42)
R6.1: Evaporator outlet sensor (Terminal Z51/52)
Expansion valve 1: Relay for expansion valve 1 (Terminal 23/24)
Expansion valve 2: Relay for expansion valve 2 (Terminal 33/34)