Sumitomo FA-20L - Mounting Position; Heat Rejection to Room; Helium Gas Pressures; Refrigerant Quality

Specifications
15
Mounting Position
Compressor must be mounted base down and level within 5 degrees of horizontal.
Heat Rejection to Room
60 Hz 2.75 kW
50 Hz
2.35 k
W
Helium Gas Pressures
Application
Flex Gas Line
Equalization Pressure
at 20° C (68° F)
RDK-101D Cold Head, 50/60 Hz
ؽ ” x 3m-20m (10ft – 65ft)
①
210 psig
CH-104 Cold Head, 50/60 Hz
ؽ ” x 3m-20m (10ft – 65ft) ②
240 psig
CH-202 Cold Head, 50/60 Hz
ؽ ” x 3m-20m (10ft – 65ft) ②
230 psig
CH-204 Cold Head, 50/60 Hz
ؽ ” x 3m-20m (10ft – 65ft) ②
240 psig
CH-204-N Cold Head, 50/60 Hz
ؽ ” x 3m-20m (10ft – 65ft) ②
240 psig
① Recommended flex gas line is P/N 268112Bxxx (has #4F couplings at one end)
② Recommended flex gas line is P/N 263058Bxxx
Mass of helium refrigerant in compressor at 1.65 MPa (240 psig): 34g (0.07 lbs.)
Refrigerant Quality
Required refrigerant for charging is 99.999% pure helium gas with a dew point temperature less
than -60° C (-76° F) at 20.7 bar (300 psig).
PRESERVE YOUR WARRANTY. Specifications require the use of 99.999%
pure helium gas. Using a lesser quality of helium can damage the system and
void the warranty.
Color Codes
The compressor helium connections are color-coded to match color labels provided with the gas
lines.
SUPPLY (red) - Helium high-pressure gas supply from the compressor to the cold head.
RETURN (green) - Helium low-pressure gas return to the compressor from the cold head.
Required Spacing for Airflow
See Figure 4
Optional Spacing
Allow 600 mm (24") space in front of the compressor for access to electrical and gas
connections. Allow 600 mm (24") space on the left side (when facing the front) of the
compressor for maintenance of the adsorber.