18 Chapter 2 Mechanical Installation
DataMate 3000 Series Air Conditioner User Manual
Connecting liquid line
Connect the liquid line between the evaporator (shown in Figure 2-11) and the
condenser (shown in Figure 2-12) through the cutout of the evaporator shown in
Figure 2-10.
2.6.5 Notice For Refrigerant Piping
1. The pressure drop of the liquid line should be less than 0.4kgf/cm
2
.
2. The copper lines, an insulated discharge line and a liquid line, are available from
the factory in length of 10 meters. Contact Emerson or your sales agency for longer
piping runs.
3. Quick connects are also available to enable field supplied piping.
4. Handle the lines with care so that they will not get kinked or damaged. Use tube
benders and make all bends before making connections to either end.
5. If all refrigeration piping should be installed with high temperature brazed joints,
silver brazed joint should be used.
6. Use prevailing refrigeration practices in piping supports, leak testing, dehydration,
and charging of the refrigeration circuits. Use vibration isolating support to isolate
the refrigeration piping from the building.
7. Use a soft and flexible material to pack around the tubes to protect them when
sealing openings in walls and to reduce vibration transmission.
8. When installing the condenser above the evaporator for 6 meters, the discharge
line should be trapped at the evaporator. This trap will retain refrigerant oil in the off
cycle. When the unit starts, oil in the trap is carried up the vertical riser and returns
to the compressor.
2.6.6 Notice For Quick Connect Fittings
Take great care when connecting the quick connect fittings. Read through the
following steps before making connection.
1. Remove protector caps and plugs.
2. Carefully wipe coupling seats and threaded surface with a clean cloth.
3. Lubricate the male thread with refrigerant oil.
4. Thread the coupling halves together by hand to ensure that the threads mate
properly.
5. Tighten the coupling body hex nut and union nut with a wrench of proper size
until a definite resistance is felt.
