OEM Manual – CUBO
2
SMART
Pag. 5
1 Introduction
CUBO
2
Smart 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 CUBO
2
Smart models designed for cooling and conservation at medium
temperatures. They are identified as:
UMTT 030 MT DX UMTT 045 MT DX UMTT 067 MT DX UMTT 100 MT DX
2 Safety issues with CO
2
- 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.
Piping, equipment components and tools should be appropriate for use with R744 (CO2
refrigerant).
CO
2
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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