Install The Connecting Pipe - Midea Air Conditioner Installation Manual

5.2 Confirm dewatering
1) Remove the water testing cover and through the water testing
orifice, use the refilling pipe to fill 2000ml water into the water
pond (refers to Fig.5-3).
2) Power on, and operate the cooling of the air-conditioner. Check
the running sounds of the dewatering pump, and check the drain
outlet whether can drain normally (depends on the time of
draining, it will be delayed 1 minute then can drain), and check all
the connectors whether leak or not.
3) Stop running the air-conditioner, and check whether has any
abnormal situation after 3 minutes. If the drain pipe be laid out
unreasonable, the water will backflow too much and cause the
alarm lamp of the control box be flashed, or even overflow from
the water pond.
4) Continue to fill water until the water level over alarm water level
and stay on this state for 3 minutes, the machine will alarm and
shut off, and then it can be operated normally until power off and
remove the water.
5) Power off, and remove the water, then install the water testing
cover back to the formal place.
Water inlet hole and the water
level switch inspection hole
Water refill pipe
Maintenance drain plug
WARNING
The drain plug on the side of the main unit is using for dewatering
the water pond when the air conditioner came out fault and
maintaining, while using the unit please stuff this drain plug, for
avoiding leakage. The specified position of the drain plug please
refers to Fig.5-3.
6. INSTALL THE CONNECING PIPE
6.1 The connective length of indoor and outdoor
piping and those height difference requirements.
Connect to different outdoor units with different connective length
and height difference requirements. Please refer to Indoor Unit
Installation Manual for detail.
6.2 Piping materials and size
1) Piping materials: Copper tube special for air conditioner, normally
T2M.
2) Piping size: Please refer to Table: 6-1
installation manual
8
Water pump outlet
Fig.5-3
Table: 6-1
Piping size (mm)
Indoor unit model
Liquid side
Φ6.4
2200W～4500W
5600W～7100W Φ9.5
6.3 Procedure of connecting pipes
1. Measure the required length of the connective pipe, and make the
connective pipes in the following procedure. (Refer to Pipeline
Connection for details)
1) Connect the indoor unit first, and then connect the outdoor unit.
a. The pipe bend should be handled carefully, without damaging the
pipe and insulation layer.
b. Before screwing up the flared nut, apply refrigerant oil at the outer
surface of the pipeline flare and the taper surface of the connection
nut. Screw up the nut for 3~4 circles beforehand (see Fig.6-1).
Apply refrigerant oil
c. When connecting or disconnecting the pipeline, 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
i.The bend angle shall not exceed 90°. (See Fig.6-2)
Use a thumb to bend the pipe
Minimum radius 100mm
ii. The bend shall be preferably in the middle of the pipe length, and
higher bend radiuses are preferred.
iii. Do not bend the flexible pipe for over 3 times.
b. Bend the thin-wall connective pipe (See Fig.6-3)
Method of unleashing the spooled pipe
Straighten the pipe end
Air side
Φ12.7
Φ15.9
Fig.6-1
Fig.6-2
Fig.6-3