5800 Refrigerated Sampler Service Guide - Isco

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5800 Refrigerated Sampler Service Guide Section 3 Refrigeration System 3.4.2 Inspection 1. Using saddle tap tools (Figure 3-9), place pressure gauges on both service ports (Figure 3-8). Service Port (high pressure) Service Port (low pressure) Figure 3-8 Refrigeration service ports Figure 3-9 Piercing service port .312 O.D. tubing with a saddle tap tool 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. CAUTION All exposed copper tubing MUST be coated with acrylic paint and then covered with shrink tubing to prevent corrosion. 3. Compare the temperature readings of the inlet and outlet coils; the difference should be around 10°F. 4. A visible coating of frost should form just above the orifice (see Figure 3-11). 3-12
5800 Refrigerated Sampler Service Guide Section 3 Refrigeration System 5. Inspect as described in Table 3-2 and the paragraphs that follow. 6. When you are finished checking the line pressure, remove AC power from the sampler. 7. Crimp the tubing shut behind the saddle tap. Remove the saddle tap, cut off the tubing end, and braze with silver solder to seal it. 8. Coat all brazed areas and exposed metal with lacquer paint and cover with heat-shrink tubing. CAUTION Do not leave a saddle tap installed after use. It will cause leakage within a short time. Tubing Inspect all tubing for dents, bends, and cracks in the paint. The tubing can be damaged if struck by a hard object, such as a tool or a fan blade. Tubing must be refrigeration-grade copper tubing, and must be protected at all times from exposure to gases and other corrosive elements. Gases can eat through the copper, making it porous and prone to leaks and/or oxidized material clogging the line. All brazed areas and exposed metal must be coated with lacquer paint and then covered with shrink tubing. 3-13
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5800 Refrigerated Sampler Service Guide - Isco

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