MCAC-VTSM-2015-10 R410A All DC Inverter V5 X Series 50Hz
Installation 109
10. Merging pipe shall be done from above to the extent possible in order to avoid back flow to the system.
11. The end of drainage pipe shall not directly contact ground.
45°
indoor unit
air
main pipe
Caution
1. The drainage pipe diameter shall meet the draining requirement of indoor unit.
2. The outlet air vent cannot be installed near the lifting pump of the indoor unit.
3. Ensure condensation pump can start up and shut down normally by infusing water into the drainage pan of indoor unit and
powering on.
4. All joints shall be firm (particularly PVC pipe).
5. The drainage pipe is not to be set horizontally or at an incline towards the unit, and suspenders shall be used to avoid sagging.
6. Dimension of drainage pipe shall be not less than the connecting mouth size of the indoor units' drainage piping.
7. Work out thermal insulation for drainage pipe to avoid condensation.. Thermal insulation processing shall be continued to the
connecting part of indoor unit.
8. Indoor units with different draining pattern shall not share the same concentrated drainage pipe.
9. Discharge of condensation cannot interfere with the normal activities occupants..
10. As for long drainage piping, suspenders shall be used to ensure 1/100 slope without any sagging in the PVC pipe.
※ The support spacing for horizontal piping is 0.8-1.0mm. If the spacing is too large, it shall produce sagging and air resistance,
while air resistance could seriously influence the smoothness of water flow and cause abnormal water levels. As shown in
following figure:
5.2 Water storing elbow of drainage pipe
For indoor units with high negative pressure at the outlet of drainage pan, the drainage pipe must be equipped
with water storing elbow.
Function of water storing elbow:
When indoor unit is operating, prevents generating negative pressure from causing drainage difficulty or blow
water from air outlet.
Installation of water storing elbow:
1. Install water storing elbow as shown in following figure: H shall be more than 50mm.
2. Install one water storing elbow for each unit.
3. When installing ensure future cleaning is convenient.
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