ECKELMANN UA 400 - Cold-Room with Defrost Heater - Controller Type UR 141 TK (LT) Only

Firmware V3.15
21.04.2021
59/401
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5.5.9.1 Cold-room with defrost heater - Controller type UR 141 TK (LT) only
Parameters for fan control on the UR 141 TK (LT) are as follows:
Fan time delay (fan lead time, as standard set to 0 minutes)
Thermal fan delay
The fan starts running when cooling is started. If cooling is stopped during cooling mode, e.g. due to exceeding
the setpoint and dead band, the fan is also stopped (time-controlled fan delay set to 0). This is the case when
thefantimedelay(parameterFan forerun., menu 6-3) is set to 0 minutes.
Ifathermalfandelayhasbeenset(parameterFan forerun.,menu2-3-1…2-3-4),thefanisnotturnedon
immediately following defrosting in order to avoid blowing warm air into the cold room. If the setpoint and
hysteresis are exceeded on the cold-room air sensor during cooling mode and time-controlled fan delay is set
greater than 0, only the fan will be started initially and cooling will not be started.
The purpose of this is to transfer any cold remaining in the evaporator to the cold-room and to remove any
stratification of warm and cold air layers in the room. Cooling is not started until setpoint and hysteresis are still
exceededontheroomairsensorfollowingexpirationofthetime-controlledfandelay.
Thefanisstoppedduringdefrosting.Ifawaitingtimehasbeendefined(parameterWait Time, Menu
2-2-1...2-2-4), the fans that are running will not be stopped before initiating defrost until the set waiting time has
expired. This allows the refrigerant remaining in the evaporator when the solenoid valves are closed to
evaporate.
Application examples for fan control with cold room controllers:
Example 1: Thermal fan delay - factory setting
Fantimedelaydeactivated(parameterFan forerunsetto0minutes,menu6-3)Thermalfandelay=0°C
(parameterFan Delay, menu 2-3-1...2-3-4)
The fan switches on and off again with the cooling. In the event of defrosting the fan is switched off. Following
defrosting the fan is switched on as soon as the evaporator sensor registers a temperature below 0 °C.
Example 2: Energy-optimized operation
Fantimedelayactivated(parameterFan forerunsetto2minutes,menu6-3)Thermalfandelay=0°C
(parameterFan Delay, menu 2-3-1...2-3-4)
The fan switches off with the cooling. If refrigeration is required again, then the fan is switched on for the
programmed lead time (here 2 min.), then the cooling. In the event of defrosting the fan is switched off.
Following defrosting the fan is switched on as soon as the evaporator sensor registers a temperature below 0
°C.
Example 3: Fan time delay
Fantimedelayactivated(parameterFan forerunsetto2minutes,menu6-3)Thermalfandelay=–
(parameterFan Delay, menu 2-3-1...2-3-4)
The fan switches off with the cooling. If refrigeration is required, then the fan is switched on for the programmed
lead time (here 2 min.), then the cooling. In the event of defrosting the fan is switched off.
Example 4: All fan delays inoperative
Fantimedelaydeactivated(parameterFan forerunsetto0minutes,menu6-3)Thermalfandelay=–
(parameterFan Delay, menu 2-3-1...2-3-4)
The fan switches on and off again with the cooling. In the event of defrosting the fan is switched off.