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iCOOL Silent Inverter Condensing Units Area
Frequently Asked Questions
1
What is the inverter technology?
The inverter technology allows optimal control of goods temperature and always provides the exact degree of refrigeration capacity required. Additionally, it allows to hold optimum evaporation pressure to have better efficiency of refrigeration circuit.
It is an ideal solution for facilities with large load fluctuations such as proximity stores, supermarkets …
The adjustment of the capacity is done by means of the suction pressure control, through a pressure transducer. Therefore, depending on the signal that reaches the inverter driver, the compressor will rotate at a higher or lower speed. This will prevent the compressor from continuously stopping and starting, contributing to energy savings and the life of the compressor.
2
What is the different with digital regulation?
In digital technology the motor runs continuously at full speed, and the capacity is adjusted by a digitally controlled mechanical unloader which adjusts the vertical positioning of the orbital scroll with respect to the fixed scroll thereby reducing its capacity.
In inverter technology the capacity is adjusted by a variable speed drive that adjusted the speed of the motor.
The inverter technology is more energy efficient at part load conditions than digital technology. The digital technology will more closely match a specified load but is not as energy efficient as a comparable inverter driven.
3
How many evaporators can I supply with an iCOOL unit?
The device can handle multiple evaporators. Our experience is 10 evaporators for HFC’s iCOOL and 7 evaporators for CO2 iCOOL. It is important what is the minimum required capacity in relation to the unit.
4
What is the minimum capacity of evaporator?
The minimum capacity of the unit must be correlated with the capacity of the smallest evaporator and the capacity range of the entire installation (all evaporators). The multi-evaporator system should take into account the simultaneity factor, the level of evaporation and the frequency of operation, e.g. for drink coolers is different than for open shelves.
One option would be to combine several services so that the capacity of both is the minimum capacity of the unit. Also, if here are more smaller evaporators there is a bigger probability of having good enough minimum required capacity due to simultaneity factor.
5
What is the maximum vertical length approved between evaporator and unit?
The maximum vertical length is 10m with traps every 2m-3m – extra info in manual.
6
What is the maximum horizontal length approved between evaporator and unit?
The maximum horizontal length is 40m or individual case – extra info in manual.
7
What is the maximum ambient temperature approved for this unit?
The maximum constant ambient temperature is 43ºC.
8
What is the minimum ambient temperature approved for this unit?
The minimum ambient temperature is -20ºC For CO2 iCOOL and -25ºC for HFC’s iCOOL. For lower ambient temperatures we recommend extra kit named: “Nordic”.
9
Is unit pre-charged with refrigerant?
No, it isn’t. All units are filled dry nitrogen.
10
Do I need a laptop or a smartphone for unit configuration during startup?
You need it for CO2 iCOOL for configuration of main controller, smartphone is enough but more convenient to use is PC computer. Unit is parametrized in standard, but few parameters should be checked during startup and adjusted if necessary – for example in standard unit is configured for -10° evaporation.
For HFC’s iCOOL use of SD card installed in the unit for inverter configuration is enough.
11
Should I mount the unit on vibration isolators?
Yes, it is required to use vibration isolators with sufficient load capacity for the weight of unit, full-length support of the feet is required for units over 200 kg, point support of feet is not recommended for units over 150 kg.
12
Dynamic setpoint for condenser pressure control is available?
The CO2 iCOOL has a sensor ambient to dynamic setpoint.
For HFC’s iCOOL is not yet possible.
13
Can I connect iCOOL units to a 60 Hz power supply?
It is not possible for tandem units; the power supply must be 380-420V/3ph/50Hz.
14
Can I add heat recovery to the unit?
Yes, it is possible on request.
15
Can I use a standard SD card to load/save parameters on unit?
Yes, you can use a standard SD card.
16
What languages are available on controller display?
In HFC the display only shows numeric parameters, not defined any specific languages.
For iCOOL CO2 standard English, DE, FR are developed.
17
Is safety mode switched automatically?
It is not automatically, use the -S1 switch to select the unit operating mode.
In CO2 iCOOL and other iCOOL’s with one compressor and BLDC compressor (AVIC) there is no safety mode.
18
Must I connect remote control with WiFi, wiring or SIM card?
Yes, you can connect remote control with WiFi, ethernet cable or SIM – depending on solution ordered.
In CO2 units the possibility id to connect by any of these types, but we advise to use GSM as most reliable and independent of local shop/installations network infrastructures.
19
Can I control my cabinets and cooling chambers with iCOOL remote control system?
Yes, you can control iCOOL unit and up to 30 other controllers – cabinets and cooling chambers (option for more cabinets also possible under request). Controllers from these cabinets must have Modbus RTU communication to connect them to remote control system
20
Can I use my own remote-control system together with iCOOL remote control system?
It should be consult with R&D department. Not all systems are ready to connect with iCOOL units.
21
Can I receive SMS and/or mails regarding alarms on iCOOL units and cabinets/cooling chambers?
Yes, you can set which alarms you want to receive by SMS and/or mail.
22
In an iCOOL with more than one compressor, when does the second compressor comes into play/turns on?
After the inverter compressor passes a frequency of 80 Hz, and if suction pressure is higher than setpoint, there is a 45 s delay for the second compressor to turn on, depends on the cooling demand.
23
What additional options are available to add into an iCOOL unit?
There are different options: Heat recovery, Nordic option, we recommend these kinds of units for very low ambient temperatures. MAX option for indoor installation with special high-pressure fan. Marine option whit anticorrosive materials
24
Is the compressor protected according working envelope?
Yes, we measure temperature and pressure for critical points if limit conditions are exceeded inverter compressor will slow down or speed up (depending in which point it is working). Shutdown is forced only if limitations will not bring compressor again in to working envelope.
25
How is the lubrication of the compressor guaranteed?
iCOOL units have integrated algorithm for oil return. This function also generates a signal that can be optionally connected with cabinets control system.
