Function of UA 300 D
14
Version 2.03 27. Juni 2008
3.2.3
Defrosting
Controller type: UA 111 and UA 111 XP
These two controller types do
not
have a defrost heater. Off−cycle defrosting is controlled by the supply air sen-
sors.
Controller type: UR 141
Defrosting frees the evaporator of ice forming from normal operation. Defrosting takes place either by heating
the evaporator (electric heating element) or off−cycling the compressor. During defrosting, temperature control of
the refrigeration point is inactivated.
Defrosting has a different effect in single−zone or two−zone operation. In single−zone operation, sensors R1.1
and optionally R1.2 (only when connected) act on Defrost Relay 1.
Verdampfer 1
Evaporator 1
Valve1
Return
air
R1.1
R1.2 (optionally)
Supply
air
Defrost
heater 1
UA 300 D
ZNR.
51203
72
630
E0
Refrigeration point
controller
R1.1:
Defrost sensor
(Terminal Z31/Z32)
R1.2:
Optional defrost sensor
(Terminal Z51/Z52)
Valve 1:
Solenoid Valve 1 relay
(Terminal 25/26/28)
Defrost heater 1: Defrost relay 1
(Terminal 43/44)
On the UR 141, parameters cannot be set for a second defrost stage or heating circuit control.
Summary of Contents for UA 300 D
Page 2: ......
Page 6: ...Table of contents iv Version 2 03 27 Juni 2008 Notice ...
Page 8: ...System Design of UA 300 D 2 Version 2 03 27 Juni 2008 Notice ...
Page 40: ...Installation and Startup of UA 300 D 34 Version 2 03 27 Juni 2008 Notice ...
Page 54: ...Operation of UA 300 D 48 Version 2 03 27 Juni 2008 Notice ...
Page 100: ...Menu structure UA 300 D Controller type UR 141 94 Version 2 03 27 Juni 2008 Notice ...
Page 108: ...Specifications of UA 300 D 102 Version 2 03 27 Juni 2008 Notice ...