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DM14-01.01.18en
MIV V5 Heat Recovery DC Inverter R410A
MS Unit Installation
138
c) When connecting or disconnecting the pipe, be sure to use two spanners concurrently.
d) Do not rest the weight of the connective pipe on the adapter of the indoor unit. Too heavy load on the
adapter of the indoor unit may deform the pipe and thus affect the cooling/heating effect.
2. The valve of the outdoor unit should be closed completely (as in the factory status). Every time when
connecting the pipe, screw off the nut at the valve, and connect the flared pipe (within 5 minutes). If the nut
is put away for a long time after being screwed off the valve, dust and other foreign substance may intrude
into the pipeline system and lead to fault.
3. After the refrigerant pipe is connected to the indoor and outdoor units, expel air as instructed in the “Expel
air” section. After expelling the air, screw up the nut at the maintenance orifice.
a) Precautions for the flexible part of the pipeline
The bend angle shall not exceed 90°.
The bend shall be preferably in the middle of the pipe length, and higher bend radiuses are preferred.
Do not bend the flexible pipe for over 3 times.
b) Bend the thin-wall connective pipe
When bending the pipe, cut out a notch of the desired size at the bend of the adiabatic pipe, and then
expose the pipe (wrap the pipe with the wrapping tape after bending it).
The radio of the elbow pipe should be as large as possible to prevent flattening or crush.
Use the pipe bender to make close elbow pipe.
4. Deploy the pipelines
Drill a porthole on the wall, and put the hole sheath and hole cover through the wall.
Place the connective pipe together with the indoor & outdoor connection wires. Use wrapping tape to tie
them tight. Do not let air penetrate into it lest condensation and drips of moist.
Pull the connective wrapped connective pipe from outdoor through the sheath, which gets through the wall,
and lead it into the room.
5. Make a vacuum of connective pipeline.
6. After the above steps are completed, the spool of the valve of the outdoor unit should be completely open,
and the refrigerant pipeline of the indoor unit and the outdoor unit should be smooth.
7. Use leak detector or soap water detect leak carefully to prevent leakage.
8. Put on an adiabatic envelope (accessory) at connective pipe adapter of the indoor unit, and wrap it tight
with the wrapping tape lest condensate and leakage.
Apply refrigerant oil
Use a thumb to bend the pipe
Minimum radius 100mm
Method of unleashing the spooled pipe
Straighten the pipe end