Connecting Refrigerant Lines - Hussmann Multideck Meat 3750 Installation Manual

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 base of the case. See figure 1: service layout for location of the refrigerant up-stand.
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.
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 – it should read between 450kpa and 500kpa.
2. 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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Refrigeration entry through
base of case.
Can be either on LH end or
RH end
Figure 16:- Refrigeration connection
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 it's pressure control will respond to the
pressure from the second system. This is called cross controlling and
Remove or protect the expansion (TX) valve feeler
bulbs (or power lead if electronic valve) from heat.
Ensure the power lead is clear of heat and flame.
MJPE multideck and SMD/SME Low Height Multideck
CAUTION
should be avoided.
CAUTION
Hussmann