User Instructions
Appendix C
microTHERM™: CMX Open Loop to Closed Loop Cooling Conversion
Note: All warnings and cautions denoted throughout this user’s manual also apply to the modifi cations listed below.
General instructions and specifi cations referring to the open and closed loop systems apply to the fi eld-modifi ed units below.
This sheet details the steps taken and material required to convert a Chromalox CMX microTHERM hot
water system from open loop cooling to closed loop cooling. The basic operation involves removing the
fl at plate and replacing it with a heat exchanger bundle. Please contact the Chromalox Customer Service
department (1-800-368-2493) for more information and to order the necessary materials.
New Material Required
1. 1/4” NPT Tee 1 piece Chromalox part number 299-122818-001
2. 1/2” NPT Tee 1 piece Chromalox part number 299-122818-003
3. 1/4” NPT x 7/8” Nipple 1 piece Chromalox part number 198-122817-002
4. 1/2” NPT x 3” Nipple 1 piece Chromalox part number 198-122817-090
5. 1/2” NPT Street Elbow 1 piece Chromalox part number 107-114567-005
6. Bush Reducer 1/2” x 1/4”NPT 2 pieces Chromalox part number 032-121003-005
7. Compression Fitting, 2 pieces Chromalox part number 119-114570-001
1/4” NPT x 3/8” tube
8. Tubing 3/8” copper 2 Feet Chromalox part number 318-511965-001
9. Gasket 1 piece Chromalox part number 132-146012-020
10. Heat Exchanger Tube Bundle 1 piece Chromalox part number 353-123367-002
11. 1” NPT Pipe Plug 1 piece Chromalox part number 218-075439-066
12. Labels 1 piece Chromalox part number 170-122103-040
Replacement Steps
Figures 1, 2, 3 and 4 show the layout of the cooling confi guration for both closed and open loop
cooling. These parts are located on the top of the cooling chamber and the pump inlet. Use pipe
tape or other sealing compound when attaching threaded connections.
Figure 1: Closed Loop Cooling Figure 2: Open Loop Cooling
or
44
Note: Refer to Figures 3 and 4 for location of components.
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