Charging Procedure - SCM CUBO2 SMART Oem Manual

OEM Manual – CUBO
Total refrigerant to charge is 4000gr.
Example 2
In case that the evaporating volume is unknown, it is possible to estimate CO2 charge
considering only the pipe length and summing up 2,4 lt (= 2400 gr).
Piping length: 20mt for K65 1/2".
-
CO2 charge calculated using the second diagram: 1900 gr.
Total refrigerant charge (estimated): 1900 gr + 2400 gr = 4300 gr (> 4000gr).
Total refrigerant to charge is 4300gr.
Don't overfeed the unit with excessive charge to avoid compressor damaged.
7.2.4

Charging procedure


For charging, use port 1/4SAE (7/16"-
20UNF) on service valve
Important remarks about the CO2 charging procedure:
 CO2 of purity class of N4.0 or comparable or with moisture content <10 ppm must be used.
 Charge R744 vapour into the system to a pressure of 10 bar g then liquid charge into the liquid line
service port until you have charged the amount specified by the charge estimator.
 Charge CO2 liquid only from liquid line.
 Charge CO2 gas only from suction line.
 Never charge CO2 liquid from suction to prevent the breakdown of the compressor.
 You should top up to achieve a ¾ sight glass, in the liquid receiver, when unit is running. A liquid
overfeed can compromise correct regulation of the unit and the reliability of the compressor (liquid
return).
 Always check liquid level in different condition, especially in transcritical and defrosting mode.
 Do not mix CO2 with various other refrigerants.
SMART
2
(PS120bar - CASTEL 6110E/X15)
Pag. 15