Polycold Cryochiller
Specifications and Site Preparation
Installation and Operation Manual
Performance Specifications
Brooks Automation
214072 Revision B
3-9
Performance Specifications
lists the performance specifications for the Polycold Cryochiller product family. For additional
information, contact Brooks Automation Polycold Systems.
Notes:
1.
Standard conditions for performance testing:
•
Cryocoil environment at 25°C
•
Recommend cryocoils and line lengths
•
Cooling water temperature between 25° and 28°C
•
Operation at 60 Hz
2.
Larger cryocoils may give greater pumping speeds and can be used in some applications.
Contact your Sales Representative or a Polycold Applications Engineer for details.
3.
Standard cryocoil at 25% of maximum pumping speed
4.
Recommended cryopump start pressure is near normal crossover. Mechanical roughing pumps
and blowers are generally more effective for moisture above 1 torr.
5.
Estimated time depending upon cryocoil mass and refrigerant line.
6.
Units were tested in a manufacturing environment while under maximum load in the Cool mode.
7.
Operation at 50Hz results in warming of the cryocoil temperatures by 3 to 5°C.
8.
Operation of warmer cooling water temperatures results in a reduction of maximum load rating and
warms cryocoil temperatures by about 4°C for a 10°C increase in cooling water temperature.
Table 3-8: Typical Performance Specifications
Performance
MaxCool 4000H
MaxCool 2500L
Maximum load
(watts at warmest average temperature)
4000 W at -98 C
2500 W at -120 C
Theoretical maximum pumping speed (l/sec)
(See footnote 2)
327,800
208,600
Conservative pumping speed, in chamber (l/sec)
(See footnote 2)
220,000
140,000
Ultimate operating pressure, torr (mbar)
(See footnote 3)
5x10
-8
(7x10
-8
) 8x10
-10
(1x10
-9
)
Maximum pump start pressure, (atm)
(See footnote 4)
1.0 1.0
Time to defrost, (minutes)
(See footnote 5)
2.2 m
2
= 6min
1 m
2
= 3 min
1.4 m
2
= 3 min
Standard cryocoil surface area m
2
(ft
2
)
2.2 (23.7)
1.4 (15.1)
