FläktGroup Multi-DENCO - Page 101

Multi-DENCO Commissioning
FläktGroup DC-2013-0101-GB • Subject to modifications • R5-08/2020 101
2
nd
and 3
rd
vacuum
• Shut off the vacuum pump and add oxygen free nitrogen to a system pressure of
1bar.
• Safely release the gas to just above atmospheric pressure
• Evacuate the system to at least 2 Torr (2.6 mbar)
• Again, shut off the vacuum pump and add oxygen free nitrogen to a system pressure
of 1 bar
• Safely release the gas to just above atmospheric pressure and once again evacuate
the system to at least 2 Torr (2.6 mbar)
• Once achieved, turn the vacuum pump off and observe that the system maintains a
vacuum for at least 30 minutes to prove the tightness of the circuit.
• On completion of evacuation, the gauge manifold should be closed off and isolated
from the vacuum pump, then connected to a refrigerant cylinder, the gauge lines
should be carefully purged of any air.
NOTE!
Multi-DENCO units can contain two different types of compressors – each with their
own oil type. Please follow the below recommendations:
Size 010 - 065
FV50S
Emkarate RL68H
Mobil Arctic EAL68
Size 092 - 130
POE 160SZ
Emkarate RL32H
Alternative oils are compatible with the original oil type used, therefore these can
be mixed and alternatives can be used as "top up".
For X-Version & H-Version units, refer to the separate condensing unit installation
manual for compatible oil types.
Emkarate Typical Properties
Tab. 8-1
Property and Procedure RL32H RL68H
Viscosity @ 40°C (cSt), ASTM D-445 33.7 72.3
Viscosity @ 100°C (cSt), ASTM D-445 5.9 9.8
Typical SUS Viscosity @ 100°F 150 300
Viscosity Index, ASTM D-2270 110 120
Pour Point (°C), ASTM D-97 -46 -39
Density @ 20°C (g/ml), ASTM D-1298 0.977 0.977
Flash Point (COC) (°C), ASTM D-92 270 270
Acid Value (mgKOH/g), ASTM D-974 modified 0.02 <0.02
Water Content (ppm), ASTM E 1064-85 <50 <50
Refractive Index @ 28°C 1.4530 1.4557