Connecting Refrigerant Lines - Hussmann DC-1 Series Installation Manual

PRODUCT INSTALLATION MANUAL

Connecting Refrigerant Lines

Connection of refrigeration lines is to be undertaken by qualified persons only.
Refrigeration pipes are located under the cold plate and can be run from under the case. See Fig (1): service layout for
location of the refrigerant up-stand, and Fig (15) for the location of refrigeration lines.
Up to four cases can share one refrigeration up-stand, however, to ensure best performance, it is recommended that no
more than three cases share an up-stand. Site refrigeration engineer must ensure correct pipe route and size to comply
with refrigeration standard AS 5149 and refrigerant prepare drop coil return through the vertical risers.
The evaporator coils have been charged with dry nitrogen in the factory.
REFRIGERATION
LINE ACCESS
To connect refrigeration lines:
1. Ensure the evaporator coils are fully charged by checking the dry nitrogen holding charge against the pressure
written on the tag attached to the coil.
2. Run pipes underneath the cold plate as per store requirements.
3. Braze the pipes to the coil using dry nitrogen to prevent any foreign matter being left in the lines. Keep pressure
below 1700kPa (250 Psig).
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Fig (15) Refrigeration access holes
CAUTION
Do not run refrigeration lines from another compressor through
a case. Since pressure in the first system responds to the
coldest location, refrigeration lines from the first system running
through a second system may be chilled to the point that its
pressure control will respond to the pressure from the second
system. This is called cross controlling and should be avoided.
DC13 COLD PLATE
Hussmann