20
P5417050-rev.1
Be careful that water does not splash onto electrical components such as the fan motor, float
switch, or thermistors.
g. Installing Main Condensate Piping
• Install the main condensate pipe on a downward slope to make sure that it is lower than each
raised part of the condensate pipe from the indoor unit.
• The size for the main condensate pipe must be larger than VP30, the nominal diameter size of
1-3/16 inches (30mm) and, outer diameter 1-1/2 inches (38mm) according to the number of the
connected indoor units.
5. Drainage and Water Leakage Check
After performing the condensate piping work and the electrical wiring work, check to ensure that water
flows smoothly according to the following procedures.
● Drainage Operation by Float Switch
The following are regular procedures to check float switch operation:
▫ Turn ON the power supply.
▫ Pour 50 to 67oz (1.5 to 2 liters) of water gradually into the condensate pan.
▫ Check to ensure that the water flows smoothly inside the transparent condensate piping and
drained at the pipe end, and that no moisture leakage occurs.
▫ If the end of the condensate pipe cannot be checked visually, pour another 50 to 67oz (1.5 to 2
liters) of water into the condensate pan. If the water overflows from the condensate pan, there
might be something wrong inside the condensate pipe. Inspect the condensate pipe.
1/25 to 1/100
Downward Slope
Min. 3-15/16 inches (100mm)
(higher as possible)
Main Condensate Piping (Min. VP30)
Use PVC with VP25
This condensate pipe shall be
separating from other pipes.
Condensate Piping
of Unit Side
(Downward Slope from Rising Part)
Vinyl Tape
Position for Checking Drainage
Condensate Hose
(Accessory)
for Checking Drainage
(Transparent)
● Do not allow condensate piping to rise above the
level of the drainage basin in the unit, away from the
unit. Otherwise, moisture can settle back into the
unit with the hazard of spillover when the unit has
stopped.
● Do not hook up to sanitary sewer lines. Local
applicable plumbing codes must be followed.
NOTICE
Pour water to the condensate pan
Access Window
Condensate Pipe Connection
Water
When Pouring Water through Air Outlet
Rising Part
Upward Slope
Incorrect Installation of Condensate Piping
