LG Multi F A2UW14GFA0 Engineering Product Data Book page 312

2. Guideline for each installation process
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.
45~60°
NOTE
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.
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
Sum of the capacity
of indoor units (Btu/h)
Internal diameter (External)
NOTE
Select the diameter of the horizontal pipe bigger than vertical.
17 _
Heat pump 50Hz/R410A
45~60° angle connection against overflow
45~60°
45~60°
Sharing horizontal pipe
[Table] Drain pipe diameter selection standard
~80,000
25(32)
Face the vent pipe mouth
downward to keep foreign matter
from penentrating the system
700mm
maxinmum
Common drain pipe
Trap in the end
~200,000 ~400,000 ~600,000
32(40) 40(50) 50(60)
~1000,000
65(75)