Mitsubishi Electric CMB-WP-V-GA1 Data Book page 176

3. Piping Design
3-2-2. Drain piping work
1. Drain piping work
• Ensure that the drain piping is sloped downward (sloped gradient of more than 1/100) toward the discharge side.
If it is impossible to take any downward pitch, use an optionally available drain pump to obtain a downward pitch of more
than 1/100.
• Ensure that any horizontal drain piping sections that are longer than 20 m are supported with metal brackets to prevent it
from bending, warping, or vibrating.
• Connect the supplied drain hose to the discharge port on the unit. Use hardvinyl chloride pipes VP-25 (ø32) for drain piping
(2). Tighten the supplied drain hose onto the discharge port using the supplied hose band. (For this, do not use any adhesive
because the drain hose will need to be removed for servicing at a later date.)
• Do not use any odor trap around the discharge port.
1
25cm 1.5 – 2m
Downward gradient
of more than 1/100
Insulating material
• As shown in 3, install a collecting pipe about 10 cm below the drain ports and give it a downward pitch of more than 1/100.
This collecting pipe should be of VP-30.
• Set the end of drain piping in a place without any risk of odor generation.
• Do not put the end of the drain piping into any drain where ionic gases are generated.
• Drain piping may be installed in any direction. However, please be sure to observe the above instructions.
3
HBC controller
Please ensure this
length is at least 10cm.
2. Discharge test
After completing drain piping work, open the HBC controller panel, and test drain discharge using a small amount of water. Also,
check to see that there is no water leakage from the connections.
3. Insulating drain pipes
Provide sufficient insulation to the drain pipes just as for refrigerant pipes.
Be sure to provide drain piping with heat insulation in order to prevent excess condensation. Without drain piping, water may leak from
the unit causing damage to your property.
MEE15K052
Supporting bracket
VP-30
Indoor unit Indoor unit
Collecting pipe
2
Drain discharge port
Drain hose (200 mm long, accessory)
Cable tie (accessory)
Hose band (accessory)
VP-25
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