Connecting Refrigerant Lines - Hussmann austral DD DELI-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 pan decks and can be run from case to case through designated access holes in
the end frames and/or out via the bungs at the rear and base of the case. See Fig (1): service layout for location of the
refrigerant up-stand, and Fig (15) for the location of access holes.
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.
The evaporator coils have been charged with dry nitrogen in the factory.
FRONT
T
REFRIGERATION
LINE ACCESS HOLES
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. Drill holes through bungs and foam and run pipes 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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Page 16
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.
DD13 2T SERVICE DELI
REAR
Hussmann