5800 Refrigerated Sampler Service Guide - Isco

5800 Refrigerated Sampler Service Guide
Section 3 Refrigeration System
3.4.3 Refrigerant Charging On-site charging must be performed by licensed service personnel
only. Consult local laws regarding refrigeration repair.
WARNING
Do not run the compressor during evacuation, leak testing,
or charging.
1. Through the low pressure service port, evacuate the system
to 150 microns or less.
2. Through the high pressure service port, pressurize the system
with dry nitrogen before charging to ensure that there
are no leaks. If there is a leak in the refrigeration system,
replacement is recommended. See the procedure in
Section 3.4.5 for details about system replacement.
3. Through the high pressure service port, charge with
5.50 ± 0.10 oz. of refrigerant HFC-R134a.
CAUTION
The correct amount of refrigerant is critical to proper operation
of the 5800.
4. When charging is complete, crimp the high pressure service
port near the joint, and the extension close to the tee.
5. Braze the ends of the service port tubes with silver solder
to seal.
6. Coat any exposed copper tubing with acrylic paint.
CAUTION
All exposed copper tubing MUST be coated with acrylic paint
and then covered with shrink tubing to prevent corrosion.
7. Slide the 3" shrink tubing over the joints and shrink-seal
to protect the metal. All bare metal must be covered.
8. Apply 15" of cork insulating tape to the suction line, beginning
at the compressor and ending even with the bottom of
the metal tab on the frame.
Suction line
wrapped in cork tape
High-pressure service
port, covered with
heat-shrink
Figure 3-12 Protective coverings for suction line and service ports
3-16