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Firmware V3.15
21.04.2021
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5.4.10 Start delay after fan
Controller type: UR 141 TK (LT) only
With freezer coldrooms, cooling can be set to start with a definable delay after the fan has started. This function
is useful in large low temperature coldrooms to prevent temperature stratification (warm at the top cold at the
bottom) in the event of longer evaporator idle times.
In such an instance starting may be delayed while the evaporator fan circulates the cold-room air for a few
minutes. If temperature on the sensor then reaches the setpoint, the controller cancels demand for cooling and
the evaporator fan stops.
5.4.11 Emergency operation
Cooling can continue for a definable on time (0 to 100%) in the event of failure of temperature measurement or
the control temperature sensors (Menu 6-3). The emergency operation interval is 10 minutes, which means that
when a 10% on time is set cooling is ON for 1 minute and OFF for 9 minutes of the interval.
5.5 Defrosting
5.5.1
Types of defrosting – an overview
The following types of defrost are described in the following chapters:
Chapter
Chapter
Druckgasabtauung (Heißgasabtauung)
Chapter
Chapter
Master-Slave-Modus - Abtau-Synchronisation über CAN-Bus
Chapter
Master-Slave-Modus - Abtau-Synchronisation über Verdrahtung
Chapter
Folgeabtauung (FA) über CAN-Bus
In emergency operation, cooling alternates for the first and second zones so as to avoid unnecessary
load due to simultaneous actuation of refrigeration points.
Fire hazard!
On grounds of fire prevention, during the planning of the installation a device for shutting
down the defrost heating in the event of excessive temperature (e.g. "KLIXON") must be provided.
Summary of Contents for UA 400
Page 26: ...Firmware V3 15 21 04 2021 26 401 Solenoid valve Relay for Solenoid Valve 1 ...
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Page 361: ...Firmware V3 15 21 04 2021 361 401 FANS 2 Pos XXXXX Fan Delay Fan delay ...
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