2. Guideline for each installation process
17
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Heat pump 50Hz/R410A
Part 3 Design and installation
2.3.3 Grouped drain pipes
It is standard work practice to make connections to the main pipe from above.
The pipe down from the combination should be as large as possible.
The diameter of ventilation pipe should be same or larger than drain pipe diameter.
Sharing horizontal pipe
slope 1/
50 ~ 1/
100
700mm
maxinmum
Trap in the end
Common drain pipe
45~60° angle connection against overflow
45~60°
45~60°
45~60°
Face the vent pipe mouth
downward to keep foreign matter
from penentrating the system
1. Trap is required if the pie is open towards sewage to prevent bad smell from coming to indoor.
2. Do not connect drain pipe with building common drain pipe in heavy snow area. It might block the pipe with ice and
remaining collected water can get back to indoor unit.
Provide seperate air conditioner drain pipe.
NOTE
Grouped drain piping standard
- For drain pipe diameter selection, refer to the following table.
- The drainpipe should be used for only air conditioners. If you share it for rainwater drain, you should be careful of a
back flow, leakage, bad odor and so on.
- Use separate drain pipe for polluted water or wasted water
[Table] Drain pipe diameter selection standard
Select the diameter of the horizontal pipe bigger than vertical.
NOTE
Internal diameter (External)
25(32)
32(40)
40(50)
50(60)
65(75)
Sum of the capacity
of indoor units (Btu/h)
~80,000
~200,000
~400,000
~600,000
~1000,000
