18 Chapter 3 Installation
SmartCabinet Integrated Solution User Manual
tightened. The final quarter turn is necessary to ensure that the joint does not leak. Two wrenches must be used to
cooperate with each other during connection, because one wrench can damage the coupling copper lines easily.
The recommended torque values are listed in Table 3-3.
Table 3-3 Recommended torque value
Coupling size
Torque value (N.m)
1/4
”
6 ~ 7
1/2
”
8 ~ 9
3. Required Pipe Connections
Refrigerant pipe between the indoor unit and the outdoor unit (discharge pipe and liquid pipe)
1) The copper pipes provided by the factory are 5m. If longer pipes are required, contact Emerson or your sale
agency.
2) The liquid pipe is the refrigerant liquid pipe of the outdoor unit outlet. So a reasonable pipe diameter and length
should be selected for the liquid pipe to ensure that the pressure drop of the refrigerant liquid through the pipe during
unit operation does not exceed 40kPa (5psi ~ 6psi).
3) The pipe should be installed and removed with care so that they will not get kinked or damaged. Use tube benders
and make all bends before making connections to either end.
4) If jointing mode is needed, all refrigerant piping should be connected with silver-brazed joints.
5) Check piping supports, leakage testing, dehydration of refrigerant pipes and evacuation before using. Use vibration
isolating support to isolate the refrigeration pipes from the building.
6) Use a soft and flexible material to pack around the pipes to protect them from damage caused by going through
openings in walls and to reduce vibration transmission.
7) Connect pipes of indoor and outdoor units according to the labels. The unit uses quick connection mode.
8) Adding refrigerant for long pipe system
The AC has been charged with appropriate refrigerant before delivery. If the connecting pipe between the indoor unit
and the outdoor unit is longer than 5m, add refrigerant to the system in order to ensure normal system operation
according to the following formula.
Adding refrigerant amount (kg) = adding refrigerant amount per meter of liquid pipe (kg/m) × total length of extended
liquid pipe (m)
See Table 3-4 for the adding refrigerant amount per meter of liquid pipe.
Total length of extended liquid pipe (m) = total length of liquid pipe (m) - 5m
Table 3-4 Adding refrigerant amount per meter of liquid pipes with different ODs
Liquid pipe OD (inch)
Adding refrigerant amount per meter (kg/m)
1/4
0.040
3.2.4 Connecting Drain Pipe Of Indoor Unit
The indoor unit drains water to the tray inside the cabinet directly. The condensate water flows to the drainage
channel or outdoor along the drain pipe on the bottom of the cabinet, as shown in Figure 3-9. The standard length of
the drain pipe is 5m. The drain pipe cannot be placed on frozen places, and it must be laid on the ground closely,
moreover, the pipe cannot be higher than the tray outlet.