Refrigeration Components General - Thermo NESLAB HX 150 Service Manual

Refrigeration Components General

Replacement Procedures
Note: Make note of the in/out orientation of all components
before disassembly so that they may be correctly oriented
during installation. The Filter/Dryer should always be changed
along with any other refrigeration component or when the refrig-
eration system has been exposed to atmospheric moisture.
1. Disconnect the unit from line voltage
2. Remove access panels.
3. Recover system refrigerant.
4. Remove the valve cores.
5. Remove solenoid coil/s.
6. Disassemble solenoid valve/s (this procedure is shown in the
"Solenoid valve replacement procedure") and remove the
internal components (for purging). Place the nut and stem
back on the valve and secure snugly.
7. Protect all components that could be damaged during braz-
ing with damp rags and/or metal shielding.
8. Apply a slow nitrogen gas purge.
9. Unsolder all components being changed and remove.
10. Remove nitrogen purge.
NOTE: All components should be clean and silver sol-
dering flux applied. The Filter/Dryer should be the last
component installed to prevent contamination.
11. Place new components into position. Check that the "IN" /
"OUT" sides are in proper orientation in the system as notes
before removal. If a new solenoid valve is being installed
make sure that it is disassembled (see step 6 above).
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