Cool Expert MIC QKL mini 2 설치 및 운영 매뉴얼 - 페이지 5
{카테고리_이름} Cool Expert MIC QKL mini 2에 대한 설치 및 운영 매뉴얼을 온라인으로 검색하거나 PDF를 다운로드하세요. Cool Expert MIC QKL mini 2 13 페이지. Cooling system intelligence
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MIC QKL mini 2
Control mode (Sensors & defrost detection)
dSL
cS
dSC
W E
Dual sensor control load integral (dSL)
Method for defrost detection by specifying a humidity level between 25 and 100%. (See setting under
"cSL" from 25 to 100%) In the control mode "dSL", both sensors TL1 and TBL must be connected.
Dual sensor control adaptive (dSC)
The defrost detection is carried out adaptively here, at the energetically optimum time. In the control
mode "dSC", both sensors TL1 and TBL must also be connected. Always observe the work
instruction "Requirement for correct defrost detection".
Single sensor control (SSC)
Single sensor control: The control of the room temperature as well as the defrost detection and
defrosting control takes place solely by means of the cooler block sensor TBL. The humidity level
under "cSL" must be predefined from 25 to 100% for defrost detection.
Note:
If residual ice is detected on the surface of the cooler block after a long period of operation time, this
can be due to system-related causes. In this case, check to make sure that the expansion valve is set
correctly (evaporator superheat), the system has sufficient refrigerant and the cooler block sensor
TBL is positionated according to the installation manual MIC Sensor Pt1000. This list could be
continued arbitrarely. The controller can be configured to the control mode "dSL" in order to increase
the sensitivity of the defrost detection.
Defrost load pre-selection
Parameter is only valid in conjunction with "cS ", "dSL" or "cS ", "SSC"
cSL
W E
The expected humidity level has utmost priority for determining this value. The greater the value, the
more sensitive the defrost detection.
Defrost management
HGE
cD
W E
Hot gas defrosting in multicompressor racks/central refrigeration plants (HGE)
The cooling process is interrupted, the defrost relay switched on, the fan is controlled as configured
under "cFA". At least two coolers of double output must be in cooling mode during the defrosting
process regardless of the setpoint temperature in order to supply a cooler with hot gas for the
purpose of defrosting. The task described above can be implemented individually by the
corresponding configuration of the digital inputs "cI1"or "cI2", as shown under the menu item
defrost communication "dLC".
Hot gas defrosting in refrigerating plants (HGS)
The hot gas defrosting is initiated as in the previous case of multicompressor racks. After an
integration period for carrying out the pressure compensation, the compressor is switched on to
supply the hot gas. After the defrost end temperature has been reached, the compressor is switched
off. During the following drain down time*, the controller switches off the defrost relay, by means of a
time delay, and switches the compressor on at the end of the drain down time*.
Applicable to both hot gas defrosting methods (HGE) and (HGS)
The defrost end temperature is calculated adaptively depending on the heat content of the hot gas.
Under the menu items "cdE" and "cdP", the defrost period as well as the defrost end temperature,
can be adjusted downwards, if necessary. After reaching the defrost end temperature, the cooling
process is initiated once again at the end of an adaptive drain down time*. The start of the cooler fan is
temperature and time-delayed, depending on the setpoint temperature, as described in the standard
fan management under "Std".
Recirculating air defrosting (FAn)
The cooler fan is used exclusively for defrosting during the recirculating air defrosting. The defrost
end is calculated adaptively. The expected defrosting duration is determined by the controller within
the range of 12 to 45 minutes depending on the adjusted set point value. Two sensors are always
required for the recirculating air defrosting (control mode "cS", "dSL" or "dSC")! Setpoint values
under 0 °C / 32 °F are not permissible (Attention: even during setpoint shift the setpoint value must
not be less than 0 °C / 32 °F). Non-compliance results in the alert "EUS.". The defrost relay is
switched on during the recirculating air defrost if the goods protection program "cGP" is
configured to "OFF". The connection of an electric heater is in this case not allowed.
Electric defrosting (EL)
The heating output required for the defrosting is supplied by an electric heater. A dynamic control
process takes place above the melting point dependent on the cooler block temperature until the
defrost end temperature is reached in order to minimise heat loss caused by convection and thermal
radiation as well as from the heating output. The LED defrost request flashes while the defrost relay is
switched off. The defrost end temperature and defrost period can be set under the menu items "cdE"
and "cdP". Depending on the ice buildup of the cooler the defrost end temperature is increased by the
controller by a maximum of 5 K / 9 °R.
Attention!
It is essential to ensure that the coolers during the defrosting process never interfere with each other
due to secondary air currents. Secondary air currents do not only cause higher energy costs but also
seriously impair the availability of a cooling plant. This results in icing-up in the area of the cooler,
especially when operating at sub-zero temperatures.
Note:
Before starting the heat-up phase, the cooler-fan remains switched on for a maximum of 12 minutes
for the use of a possible cold storage within the cooler block. During this time, the defrost request LED
flashes. If the cooler block reaches the setpoint temperature within this time, the heat-up phase starts.
* Drain down time: After reaching the defrost end temperature, an adaptive drain down time follows
for a period of approx. 5 to 8 minutes in order to ensure that the defrost water drains off. During the
Factory setting
W E
(All temperature values of the factory setting are indicated in Celsius)
(Config Sensors)
Dual sensor control load integral
(Dual Sens Control LID)
Dual sensor control adaptive
(Dual Sens Control)
Single sensor control
SSC
(Single Sens Control)
(Config Defrost Load)
Medium humidity level value:
75
25 to 100%
Hot gas defrosting in multicompressor racks
(Hot Gas extended)
Hot gas defrosting in refrigerating plants
HGS
(Hot Gas Singleplants)
Recirculating air defrost
FAn
(Fan Defrost)
Electric defrosting with adaptive defrost
EL
end temperature (Electric)
drain down time, the defrost request LED flashes. The cooling process starts when the drain down
time has finished. The start of the fan is time delayed depending on the setpoint temperature as
described in the standard fan management under "Std".
Defrost end temperature
Parameter is only valid in conjunction with "cd ", "HGE" or "cd ", "HGS" or "cd ", "EL"
cdE
The menu item "cdE" has a dual function.
On the one hand, a defrost end temperature from 2 - 50 °C / 35.5 - 122 °C can be set under "cdE".The
precondition for setting the defrost end temperature is the configuration of the electric defrost "EL"
under "cd".
On the other hand, the calculated defrost end temperature can be adjusted downwards under "cdE"
if one of the two hot gas defrost modes "HGS" or "HGE" is configured under "cd". The adjustment is
made within the scale from 2 to 50 °C / 35.5 to 122 °F with the values from 2 to 10°C / 35.5 to 50 °F.
The cooler block temperature and the period of the defrosting process are used for calculating the
defrost end temperature. This means: hot gas with high heat content = short defrosting process with
high defrost end temperature max. = 30 °C / 86 °F. Hot gas with low heat content = long defrosting
process with low defrost end temperature min. = 10 °C / 50 °F. The correction value 10 has the least
influence on the adaptively calculated defrost end temperature. The value 2 has the greatest
influence if the adaptively calculated defrost end temperature should be adjusted downwards .
Adaptive calculation of defrost end temperature (Std)
The defrost end temperature is calculated adaptively by the controller itself. It is calculated
depending on setpoint temperature, amount of frost/ice and the power of the defrost heating.
Defrost period
Parameter is only valid in conjunction with "cd ", "HGE" or "cd ", "HGS" or "cd ", "EL"
cdP
Adjustable defrost period
(Config Defrost)
The defrost period can be set from 5 to 50 minutes. In contrast to timed defrosting procedures, the
pre-defined defrost end temperature under "cdE" is included. The set value is a reference value. The
actual defrost period is based upon the heating output and the ice buildup of the cooler.
The controller adapts the defrost detection, taking the defrost end temperature into account, in order
to reach the set target time. This process can require several defrost cycles. If the heating output is
too low, the set value might not be reached or it might only be reached approximately.
Adaptive defrost period determination (Std)
The controller calculates the optimal defrost period adaptively from 10 to 45 minutes based on
system parameters determined by the controller. The setpoint temperature and the evaluation of
previous defrosts are essentially the basis for the calculation.
Air cooler fan management
cFA
Fan runs permanently, with night cover*, fan is on during the defrost(PdA)
Fan runs permanently with additional detection of a night cover*.The fan is switched on during the
defrosting process.
Fan runs permanently even during the defrost (P_A)
Fan runs permanently even during the defrosting process.
Fan runs during the defrost (__A)
Fan runs according to the standard fan management "Std", but also during a defrosting process.
Fan runs permanently with night cover* (Pd_)
Fan runs permanently with additional detection of a night cover *. The fan remains switched off during
the defrosting process.
* Night cover "PdA" and "Pd_": During a load reduction within a refrigerated unit, due to a night
cover, the controller switches from permanent operation to standard operation automatically. After
cancelling a night cover, the controller switches back to permanent operation automatically. The
detection of a night cover is not possible under control mode"cS", "SSC".
Fan runs permanently (P__)
Fan runs permanently but not during a defrosting process.
Standard fan management (Std)
Fan pre-run: If the room temperature increases 0.5 K / 0.9 °R above the setpoint value, the fan is first
!
started (without the compressor running). The fan pre-run is controlled by means of temperature.
The delay time can vary between 90 seconds and 20 minutes until the compressor starts.The length
of the forerun time depends considerably on the course of the cooler block temperature and air
intake temperature. In any case, the cooling process is initiated above the setpoint temperature at
1.5 K / 2.7 °R. During this time, residual energy of the cooler is transferred to the refrigerated unit.
The formation of ice is reduced by the effect of sublimation, the relative air humidity increased and
the next defrosting process is delayed considerably.
Cyclic air circulation: In order to ensure even thermal stratification within the refrigerated unit, the
!
fan runs for 5 minutes every 15 minutes, if the room temperature is below the setpoint temperature .
Adaptive fan start temperature: After each defrosting process, the starting temperature of the fan is
!
recalculated depending on the setpoint value and current room temperature in order to bind any
possible residual heat within the cooler. The fan is controlled as described previously according to
the principle of the time-delay switch, which is tracked adaptively in the event of setpoint changes
and high loads.
Operating level 2
The configuration level
(Config Defrost Endtemperature)
10. 0
Adjustable value: 2 - 50 °C / 35,5 - 121 °F
Adaptive calculation of defrost end
Std
W E
temperature
(Config Defrost Periode)
Adjustable defrost period: 5 - 50 minutes
30
allowing for the defrost end temperature
Std
Adaptive defrost period determination
W E
Fan runs permanently, with night cover*,
PdA
fan is on during the defrost
Fan runs permanently even during
P_A
the defrost
__A
Fan runs during defrost
Fan runs permanently,
PD_
with night cover*
P__
Fan runs permanently
Std
Standard fan management
W E
(Config Fan)
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