ECKELMANN UA 400 - Page 37

Firmware V3.15
21.04.2021
37/401
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Waiting time (controller type UA 121, UA 131, UR 141 NK (NT), UR 141 TK (LT) only)
A wait between the time cooling is stopped and the defrost heater is started can be set at the initiation of
defrosting. This prevents simultaneous operation of the defrost heater while the evaporator is being pumped
down.
Drain time (controller type UA 121, UA 131, UR 141 NK (NT), UR 141 TK (LT) only)
Restart of cooling following defrosting can be delayed by a definable drain time. Drain time does not commence
until the last defrost relay de-energizes. This allows drip water to drain from the evaporator before cooling
restarts.
Defrosting with two temperature zones
When two zones have been selected for control of cooling, each zone is treated separately for defrosting.
Defrost start time is however the same for both zones.
Second defrost stage (controller type UR 141 NK (NT), UR 141 TK (LT) only)
The two defrost stages function can be used for example if a risk exists on a display case fitted with a drain
water collecting pan of the pan outlet freezing up when single-stage defrosting is used. To activate a second
defroststage,thecontrollermustbesettoonezonebytheTemperatureZonesparameter(Menu6-1).
This will then display the menu item for a second defrost stage (Menu 2-2-1). Defrosting is initiated by starting
the first defrost stage. The second defrost stage is started when evaporator temperature (R1.1) rises above the
setpoint for this stage.
Defrost termination is controlled by evaporator sensors R1.3 and R.1.4 for the second defrost stage and by
evaporator sensors R1.1. and R1.2 for the first stage. The defrost termination temperature set for Zone 1 is
used. The relay for the second defrost stage is the Zone 2 defrost relay.
If the 2nd defrost level is deactivated (parameter 2nd defrost level ="--"), then both defrost relays are employed.
Stock compartment on service counters
The relay "Invers defrost" (contacts 63 and 64, invers operation), which interrupts cooling of the stock
compartments, is available when configuring case controllers UA 111, UA 111 D, UA 121 and UA 141. This relay
is open when cooling is on and closed when defrosting is initiated.
Defrosting of the stock compartments extends for the full safe defrost time and therefore can run longer than
defrosting in the 1st or 2nd temperature zone. The relay is not operated until the waiting time has expired.
Manual defrosting (not with UA 131 DD and UA 131 in master-slave mode)
For a manual defrost (e.g. for service purposes), the defrost can be initiated via the system centre / store
computer / operator terminal, as follows:
ByopeningMenu5RemoteOperation–SelectRefrigerationPoint(orCANbusaddress)-3Clock-2
DefrostTimerandselectingONinthelineMan. Defrostoronthe
Host Computer (see operating instruction description of LDSWin).
In the case of discharge gas defrosting the 2nd defrost stage must not be parameterized otherwise the
2nd defrost relay is not activated, as is generally desired with discharge gas defrosting.
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When defrosting is initiated (by controller or in LDSWin) and is terminated or skipped by demand
defrosting / terminated by defrost sensor, the complete safe defrost time must have expired
before manual defrosting can again be initiated. If manual defrosting is to be initiated again
immediatelyfollowing,thefirstdefrostcyclemustpreviouslybeterminatedbyeitherofthe
following:By controller:Menu5RemoteOperation–SelectRefrigerationPoint(CANbus
address) - 3 Clock - 2 Defrost Timer, set parameter "Man. Defrost"(Menu3-2)OFF.In
LDSWin:ClickonTerminateDefrostingbutton.Manualdefrostingcanthenberestarted
immediately.
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