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INSTALLATION
3.9
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. These are in:
•
The end frames
•
Base of the case
•
Run through to the top of the case.
3X for the
service layout for locations of the
refrigerant supply line
•
Up to four cases can share one refrigeration supply
line, however, to ensure best performance, it is
recommended that no more than three cases
share an up-stand. Liquid lines must be sized to
supply full head of liquid at all times, and suction
line sizes must consider refrigerant velocities
for proper oil return during both high and low
loads whilst meeting customer specifications for
maximum allowable pressure drop.
•
The evaporator coils have been charged with dry
nitrogen in the factory. The holding charge of dry
nitrogen will be stated on a tag on each evaporator
coil. Please check and verify pressure is within +/-20
kPa (3 psi) of tag stated pressure before installation.
•
For all pipe sizes refer to latest Product Engineering
Data Sheet (PED).
Bottom of the case
Top of the case
PAGE 22
To connect refrigeration lines:
1. Use free-flowing dry nitrogen when brazing piping
to ensure internal cleanliness of piping and to
eliminate copper oxide debris.
2. Insulate all external pipe work to standard practice
and customer specifications. Insulation should be
adequately sized/rated to prevent condensation
forming under any circumstances.
See figure
3. Permanent sealing of all penetrations made
in the cabinet panels inside-to-outside is the
responsibility of the installer.
4. Connect to condensing unit or compressor.
5. Pressure test all welded and fastened connections
to ensure they are free of leaks.
6. Dehydrate the refrigeration system using the
triple evacuation method. Use a vacuum pump
to a minimum of 1000 microns for the first two
evacuations, and a minimum 500 of microns on the
third, or to the customer's specific requirements.
Break evacuations 1 and 2 with dry nitrogen,
allowing the pressure to rise above atmospheric
pressure each time.
7. Charge with refrigerant after final (3rd) evacuation.
Once the last vacuum has passed holding 500
microns or lower with no rise for 1 hour with the
vacuum pump off and measured at the furthest
feasible point in the system away from the vacuum
pump.
FIGURE 3X
NOTE:
All installation works must
be completed by a qualified person
to best trade practices, customer
specifications, relevant AS or ISO
Standards and any Territorial Authority
requirements or regulations.
CAUTION:
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.
PSM15E3R SEMI-VERTICAL - HUSSMANN
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