4700 Refrigerated Sampler Service Guide
Section 3 Refrigeration System
3-9
Refrigeration repairs are not performed by the factory, and
on-site repairs are not recommended. Teledyne Isco recommends
replacement of the refrigeration module in the event of com-
ponent failure.
If it is still deemed more practical to repair the system, on-site
repairs must be performed by licensed service personnel only.
Consult your local laws regarding refrigeration repair.
Tools and supplies
Inspection
1. Using saddle tap tools (Figure 3-12), place pressure gauges
on both service ports (Figure 3-11).
Figure 3-11 Refrigeration service ports
2. Reconnect line power and allow the refrigerator to run,
observing the pressure gauges. Pressure on the high port
should be around 150 psi; pressure on the low port should
be around 10 psi.
Copper Tubing
Tubing must be cleaned and capped copper,
refrigeration-grade. DO NOT use general pur-
pose tubing.
Tubing sizes:.250 O.D. x .190 I.D.
.312 O.D. x .280 I.D.
Saddle Tap Tool
For .312 O.D. service ports.
Silver Solder
Solder must be refrigeration-grade silver. DO
NOT use general purpose solder.
Lacquer Paint
Brazing and all exposed metal must be coated
with lacquer paint to prevent corrosion.
Heat-Shrink
Tubing
Service Port
(high pressure)
Service Port
(low pressure)
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