Brooks Polycold MaxCool 2500L - Cryocoils and Refrigerant Lines

Specifications and Site Preparation Polycold Cryochiller
Cryocoils and Refrigerant Lines Installation and Operation Manual
Brooks Automation
3-10 214072 Revision B
Cryocoils and Refrigerant Lines
Refrigerant lines should be kept to a minimum length. Any line over 6m (20 ft) should be reviewed by a
Brooks Automation Polycold Applications Engineer. Longer refrigerant lines delay the start of
cryopumping and the time to complete the defrost cycle. They also add to the total heat load on the
cryochiller and impact the coldest achievable temperatures at the cryocoil. The heat gain through the
insulation on the combined feed and return refrigerant line set is 8 Watts/ft (25 Watts/m).
The cryocoil(s) must be specified and sized for the process. Contact Brooks Automation Polycold for
assistance in selecting the proper cryocoil.
Total cryocoil surface area for dual circuit models must be divided between the two circuits. Larger
cryocoils may give faster pumping speeds and can be used in some applications. However, if the heat
load is too great, the cryopump becomes less efficient and may be shut off by a protective device
Note 1 Other refrigerant line lengths and cryocoils may be possible, depending upon performance
requirements.
Table 3-9: Typical Cryocoils and Refrigerant Lines for MaxCool
Cryocoils and
Refrigerant Lines
Single Circuit Dual Circuit
MaxCool
4000H
MaxCool
2500L
MaxCool
4000H
MaxCool
2500L
Design Pressure, bar (psig) 31 (450) 31 (450) 31 (450) 31 (450)
Test Pressure, bar (psig) 44.4 (644) 44.4 (644) 44.4 (644) 44.4 (644)
Temperature Range +150C to -160C +150C to -160C +150C to -160C +150C to -160C
Standard Cryocoil Surface Area
m
2
(ft
2
) - per circuit
2.2 (23.7) 1.4 (15.1) 1.1 (11.8) 0.7 (7.5)
Standard Cryocoil Tube Length
- m (ft) - per circuit
43.8 (144.7) 27.9 (92.1) 21.9 (72.4) 18.6 (57.6)
Standard Cryocoil Tube OD
- mm (in)
16 (5/8) 16 (5/8) 16 (5/8) 12 (1/2)
Refrigerant Line Length
-m (ft) - per circuit (note 1)
2.4 (8) 2.4 (8) 2.4 (8) 2.4 (8)
Feed Line Tube OD - mm (in) 10 (3/8) 10 (3/8) 10 (3/8) 8 (5/16)
Return Line Tube OD - mm (in) 16 (5/8) 16 (5/8) 16 (5/8) 12 (1/2)