Installation
Polycold Cryochiller
Evaluate the Polycold Cryochiller / Place Into Service
Installation and Operation Manual
Brooks Automation
4-50
214072 Revision B
9.
Check the outlet temperature of the cooling water. The drain line (OUT) should be 16 to 41°C (60
to 105°F) If not, adjust the water flow to attain a temperature in this range.
10. If there is any ice or water on the refrigerant line, turn off the unit and remove the ice or water. Apply
additional insulation at the points where ice was formed or another complete layer of insulation if
the lines were icy. Re-evaluate the cryopump starting at Step 1 of this section.
11. Record the pressures and temperatures in
12. Select Defrost.
NOTE:
If a dual circuit system, select Defrost for both refrigerant circuits.
13. Record the time it takes for the cryosurface to defrost. Actual Defrost Time:________ minutes
When Defrost completes, the unit automatically switches to Standby. Default temperature is 20 C.
14. Open the vacuum chamber. The cryosurface should be dry and at room temperature or warmer.
15. Recheck the balance pressure, see
, and cooling water temperature, see
, to
verify that the Polycold Cryochiller is operating within specifications. Check that TC8, and TC10 if
a dual circuit, are at or near 20C.
16. Record all measurements taken in this task in a maintenance log for future use as a baseline.
17. Go to Installation Checklist
Initial and date this task. Go to the next task on the checklist.
Table 4-5: Cryochiller Pressures and Temperatures in Cool Mode
Item
Acceptable Range
for
MaxCool 4000H
Acceptable Range
for
MaxCool 2500L
Your
Measurements
SUCTION
PRESSURE
21 to 414 kPa
(3 to 60 psig)
21 to 414 kPa
(3 to 60 psig)
_______ kPa (psig)
DISCHARGE
PRESSURE
689 to 2827 kPa
(100 to 410 psig)
689 to 2827 kPa
(100 to 410 psig)
________kPa (psig)
DISCHARGE LINE
(TC # 1)
80 to 128 °C
80 to 128 °C
__________°C
LIQUID LINE
(TC # 2)
15 to 41°C
15 to 41°C
__________°C
COLDEST LIQUID
TEMPERATURE
(TC # 4)
-80 to -150 °C
-100 to -155 °C
__________°C
COIL IN
TEMPERATURE
-96 to -145 °C
(application based)
-118 to -155 °C
(application based)
__________°C
COIL OUT
TEMPERATURE
-80 to -145 °C
(application based)
-102 to -155 °C
(application based)
__________°C
MAXIMUM
COIL IN -COIL OUT
DIFFERENCE
20 °C
20 °C
__________°C
