Stulz SplitAir3 SAL40 - Page 49

49 © STULZ SpA . – all rights reserved EN/39B/06.2018
SAL
Opening the refrigerant connectors
Open the refrigerant taps of the external unit following this order:
• IN tap of motor-condensing unit
• OUT tap of motor-condensing unit
Filling with refrigerant (when necessary)
If distance covered by refrigerant lines is more than 5 m, refrigerant must be added. This operation
must be done after completing installation and start-up of the unit. While compressor is running,
connect the charge cylinder to the low pressure (suction) gas side of compressor and fill with the
right quantity as per table 2.
Gas/liquid pipe ext. diameter [mm] R407C additional charge [g]
10; 12 2  d
16 4  d
18 5 ,5  d
22 8,5  d
28 14,5  d
TABLE 2: Additional charge of R407C refrigerant for piping distance beyond 5m (maximum 30 m).
Values applying with condensation T = 50°C
INFORMATION
In this table d = distance (measured in meter)
Make sure, while the system is in standard operation, that the superheating complies with following
values in the next table.
Internal temperature [°C]
25 28
Internal relative humidity
% 40 40
Compressor superheating [°C]
8 12
TABLE 3: R407CSuperheating table.
Oil charge (when necessary)
The compressor is supplied with an initial oil charge. The standard oil charge for the use of the
refrigerants R407C and R134a is a polyester (POE) lubricant Copeland 3MA (32 cSt). In the field,
the oil level could be topped up with ICI Emkarate RL 32 F or Mobil EAL Arctic 22 CC, if 3MA is not
available.
Rotary compressor with R407C is supplied with ester oil VG74.
Reciprocating compressor with R407C is supplied with polyester lubricant.