SCM CUBO2 AQUA User manual

FR
DE
EN
1
OEM Manual (EN)
Version UMT/WG T-MT OEM rev. 3.0 date 08/10/2021
OEM-Handbuch (DE)
Version UMT/WG T-MT OEM Rev. 3.0 Datum 08/10/2021
Manuel OEM (FR)
Version UMT/WG T-MT OEM rév. 3.0 date 08/10/2021
Manufactured by SCM REF AB - Sweden

EN
OEM Manual –CUBO2AQUA
UMT/WG T MT Rev3.0 –08/10/2021 Pag. 1-EN
1
OEM Manual (EN)
Version UMT/WG T-MT OEM rev. 3.0 date 08/10/2021
Manufactured by SCM REF AB - Sweden

EN
OEM Manual –CUBO2AQUA
Pag. 2-EN UMT/WG T MT Rev3.0 –08/10/2021
2
Manual Guide
POINT 1-2 > INTRODUCTION & SAFETY
POINT 3-6 > UNIT DESCRIPTION
POINT 7 > COMMISSIONING
POINT 8 > SOFTWARE –USER INTERFACE
POINT 9 > SERIAL COMMUNICATIONS
POINT 10 > MAINTENANCE
POINT 11-13> ALARMS AND TROUBLES
POINT 14-21> TECHNICAL DATA

EN
OEM Manual –CUBO2AQUA
UMT/WG T MT Rev3.0 –08/10/2021 Pag. 3-EN
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Contents
1 Introduction .......................................................................................................................................................................4
2 Safety issues with CO2- Safe handling ...........................................................................................................................4
2.1 Precaution.................................................................................................................................................................4
3 Unit description & Main components.............................................................................................................................6
4 Unit installation .................................................................................................................................................................7
5 Piping details .....................................................................................................................................................................8
5.1 Pipe Connections (Multi-Split) ................................................................................................................................8
5.2 Oil traps.....................................................................................................................................................................8
6 Test and inspection before start-up ...............................................................................................................................9
6.1 Control of the unit tightness...................................................................................................................................9
6.2 Preliminary controls according to EN 60204-1, visual controls..........................................................................9
6.3 Management of the system. Configuration of the controllers...........................................................................9
6.4 Inspection of the water loop................................................................................................................................ 10
6.5 Earth connection................................................................................................................................................... 10
7 Commissioning............................................................................................................................................................... 11
7.1 Evacuation and pre-charge.................................................................................................................................. 11
7.1.1 “VACUUM”, SW function details...................................................................................................................11
7.2 Refrigerant & Oil Charging ................................................................................................................................... 12
7.2.1 Oil charge.......................................................................................................................................................12
7.2.2 Procedure for additional oil refill................................................................................................................12
7.2.3 Estimation of the refrigerant charge ..........................................................................................................13
7.2.4 Charging procedure......................................................................................................................................15
8 User Interface and main Software features................................................................................................................ 16
8.1 User Interface........................................................................................................................................................ 16
8.2 On/Off unit............................................................................................................................................................. 17
8.3 Regulation set point.............................................................................................................................................. 18
8.4 MPXPRO and ULTRACELLA/EVO CAREL configuration. .................................................................................... 19
8.5 MPXPRO and ULTRACELLA/EVO CAREL regulation ........................................................................................... 20
9 Serial Communication (PSD drivers, Evaporators and Supervisory System) .......................................................... 21
9.1 Communication with evaporators (features and requirements) .................................................................... 21
9.2 Serial connections and wirings............................................................................................................................ 22
10 Recommended Annual Checks..................................................................................................................................... 23
11 List of alarms .................................................................................................................................................................. 26
11.1 Hecu alarm............................................................................................................................................................. 26
11.2 PSD (Power+) alarm code..................................................................................................................................... 31
11.3 PSD led status........................................................................................................................................................ 33
12 Troubleshooting ............................................................................................................................................................. 34
13 Compressor Envelope ................................................................................................................................................... 34
14 Refrigerant drawing (P&I).............................................................................................................................................. 36
15 HECU Controller layout ................................................................................................................................................. 37
16 Terminals blocks connection ........................................................................................................................................ 38
17 Dimensional drawing..................................................................................................................................................... 38
18 General information and limits .................................................................................................................................... 39
19 Electrical details.............................................................................................................................................................. 39
20 Cooling capacity Table ................................................................................................................................................... 41

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OEM Manual –CUBO2AQUA
Pag. 4-EN UMT/WG T MT Rev3.0 –08/10/2021
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1Introduction
CUBO2AQUA is an high efficiency condensing unit (for CO2 transcritical application) equipped with BLDC
variable speed compressor. It is compact, easy to install and can directly communicate with the
refrigerated units.
Thanks to these features it is a very efficient (even at partial load) without any compromise with the food
conservation.
This manual refers to CUBO2AQUA models designed for cooling and conservation at medium
temperatures.
CUBO2AQUA is available with 2 x 2,4 lt liquid receiver or 1 x 8 lt.
They are identified as:
UMT/WG T 030 MT DX
UMT/WG T 045 MT DX
UMT/WG T 067 MT DX
UMT/WG T 100 MT DX
2Safety issues with CO2- Safe handling
When the R744 (CO2) is being handled, a qualified person must be present with the suitable equipment.
CO2 has no smell or colour and the operator would not be aware if there were any leaks.
The effects of increased CO2 levels on adults at good health can be summarized:
2.1 Precaution
Dedicated pressure relief valves are necessary in all those sections of the system which can be
isolated by shut valves. Due to the high thermal coefficient of expansion of liquid CO2, fluid
pipes must not be blocked.
All SCM units are protected against overpressure with pressure relief valves when required
according to EN378 and PED.
Given the high pressure that system can reach during operation, special attention must be paid
to connect and regulate the unit.
Before carrying out any repairs which involve breaking into the system/soldering or welding,
all relevant parts must be emptied of CO2.
Do not use other than the designated refrigerant (for charging, adding or recharging)
Refrigerant gas leak may cause suffocation.
CO2 concentration
Effects
%
ppm
0,04 %
< 400
Normal outdoor level
0,06 %
< 600
Acceptable levels
0,50 %
5000
8hours - Long Term Exposure Limit
1,5 %
15.000
15 minute - Short Term Exposure Limit.
3 %
30.000
Intoxicating, breathing and pulse rate increase, nausea.
10 %
100.000
Inconscious, further exposure death.
30 %
300.000
Quick death.

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Piping, equipment components and tools should be appropriate for use with R744 (CO2
refrigerant).
Use of unsuitable components or those designed for HFC refrigerant may cause serious
incidents such as equipment failure and rupture of the refrigerant cycle.
Securely place the cover on the electrical box and enclosure panel. Incomplete attachment may
lead to penetration of water and living creatures, meaning potential current leak and
fire/electrical shock.
Do not change the set values of the safety device.
Using the refrigeration unit with changed values may cause failure of the safety stop function
and lead to a burst or fire.
When abnormal operation is detected, or before starting disassembly or repair, turn off the
main power switch.
Specified components must be used for repair.
Use of non-specified components may cause failure of the safety stop function and lead to
burst or fire.
Incorrect moving may cause falling or dropping of the refrigeration unit, and cause injury.
Request a specialty operator for disposing the refrigeration unit.
Make sure that access and emergency exit ways are not obstructed to comply with the local
regulations.

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OEM Manual –CUBO2AQUA
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3Unit description & Main components
Medium temperature condensing unit is equipped with a BLDC compressors a Flash valve and an HPV
valve.
The compressor is taking in charge the evaporation pressure control for the medium temperature
refrigerated devices.
The Flash valve is controlling the pressure inside the receiver. The HPV valve is controlling the Gas Cooler
pressure.
The system operates at the following pressures:
MT Compressor discharge pressure (PGC): operating between 45-105 bar
MT Compressor suction pressure: operating between 25 - 30 bar
Receiver pressure: operating between 40 –50 bar
Compressor modulation range: 25 –100 rps
Figure 1: UMT/WG T with 2 x 2,4 lt Liquid Receiver
HPV valve
Receiver
NRV
Valve
PHE Gas Cooler
Liquid filter
dryer
Speed driver
MT compressor
3 Way Valve
Flash valve
MT
compressor
Electrical
board
Water
Outlet
Water
Inlet

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OEM Manual –CUBO2AQUA
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4Unit installation
The unit has been designed for outdoor installation.
Respect distances for correct operation/ maintenance.
In the case of several units in series or in parallel mode, respect the minimum distances for
properly maintenance.
Minimum maintenance distances.
Vertical installation
Horizontal installation

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5Piping details
5.1 Pipe Connections (Multi-Split)
The connection between the Condensing Unit and more remote evaporators can be the same one used
for Multi-Split or branch system.
The preferred one is the one is able to guarantee the highest gas velocity in the suction line (for a good
oil return) with a low pressure drop.
For Multi-Split layout, the system requires a dedicated suction line for each evaporator that will
be collected by a manifold installed close to the condensing unit. Please refer to the example
reported in the below pictures.
Multi-Split Branch
For Multi-Split system the collector must be properly sized and installed in a horizontal
position
SCM Frigo recommends connection with up to 3 remote evaporators, and maximum
suction pipe length of 20 meters to each evaporator.
Liquid line must be properly sized to supply the farther evaporators (liquid velocity < 1 m/s is
suggested).
Suction line must be properly sized to have a good oil return with a low pressure drop (gas velocity
from 3 to 8 m/s are suggested).
The condensing unit connection sizes are not necessarily the correct size for the installed pipe
network and should be sized for each installation to ensure acceptable penalties and velocities.
5.2 Oil traps
If UMTT and evaporator are installed at different heights, it is necessary to create piping oil traps.
The installation of an oil-trap is recommended (one oil-trap every 2/3 meters of difference in
height)