5800 Refrigerated Sampler Service Guide - Isco

5800 Refrigerated Sampler Service Guide
Section 3 Refrigeration System
3.4 Refrigeration Module The following sections describe inspection and servicing procedures
for the refrigeration module.
WARNING
The refrigeration system in the 5800 sampler is a finely
tuned system. Any small changes will affect the operation
of the unit and may compromise the ability of the sampler
to meet cooling specifications. Teledyne Isco highly
recommends replacing the entire refrigeration assembly
rather than having the user attempt any repair of the
refrigeration system. A replacement system comes fully
charged and tested. It is ready for installation and does not
require any further adjustments.
IF user repairs are attempted, please keep the following
points in mind:
· The amount of refrigerant required for the system to
operate correctly is 5 oz. +/-.1. System performance will
noticeably degrade with a change of as little as +/-.2
ounces. This small amount requires the use of a very
accurate scale with resolution of no greater than .1 oz.
· When charging the system, the length of hoses used to
connect the gauge set must be considered. The volume
of the refrigerant in the hoses will vary depending on
hose length and the given temperature.
· Care must be taken if the industry standard piercing
saddle valves are used. These valves tend to leak and
should never be left in the system.
· We recommend the installation of brazed in valves. Be
sure no debris are introduced into the system.The
valves and cylinder of the compressor are vulnerable to
debris. Any particulates introduced on the low side will
be ingested by the compressor and may cause failure.
WARNING
Risk of injury or equipment damage. Familiarize yourself
with the general instructions on pages 1-13 and 1-13.
CAUTION
All exposed copper tubing MUST be coated with acrylic paint
and then covered with shrink tubing to prevent corrosion.
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