Daikin GYEQ20AN Service Manual page 64

Installation Work Manual
Piping work for outdoor unit exhaust drain and condensed water drain pipes
Precautions on drain piping work
WARNING
CAUTION
Exhaust drain pipe
Attach the drain hose (standard accessory) and extend the
pipe so that the drain water is discharged into suitable
public drainage. Make sure that you comply with relevant
laws. The discharging end should be fixed. When multiple
units are installed, each unit should have individual piping.
Condensed water drain pipe
Attach the drain hose for the refrigerant container and
extend the pipe so that the drain water is discharged into
suitable public drainage. Make sure that you comply with
relevant laws. The discharging end should be fixed.
53
Separate pipes must be used for outdoor unit exhaust drain and for indoor unit drain.
Sharing the same pipe between these two purposes could possibly cause
intoxication due to exhaust gas backflow or a fault due to corrosion of a circuit
board or some other part of the indoor unit.
If you plan to discharge outdoor unit exhaust drain into a drain container or ditch
with a lid or to discharge both outdoor unit exhaust drain and indoor unit drain into
the same place, configure the piping so that exhaust gas contained in exhaust
drain is emitted into the atmosphere. (Discharge the exhaust drain into the open air
as illustrated below.)
Separate pipes must be used for exhaust drain and for condensed water drain, and
the exhaust drain pipe must be prevented from exhaust gas backflow. Exhaust gas
backflow may result in a fault due to rusting of parts inside the engine room.
Make sure that the extension hose is free from vertical warping, water
accumulation, and clogging.
During cold seasons, drain water inside the pipe may freeze, rendering the engine
inoperable. If there is a possibility of freezing, the pipe must not exceed the maximum
length at which a gradient can be obtained. After cutting the pipe at that length, fix it
to a drainpipe or similar so that drain can flow through the discharging end.
When it is unavoidable to collectively install the drain pipes of two or more units,
make sure that they are not exposed to exhaust pressure. If collectively installed
pipes are exposed to exhaust pressure, exhaust may flow back into the outdoor
unit when it is idle, possibly resulting in malfunction.
If the outdoor unit is installed on a balcony or similar location and the roof is
covered with a waterproof sheet, extend the outdoor unit exhaust drain pipe
without damaging the waterproof sheet and so that the drain water is discharged
into suitable public drainage. Make sure that you comply with relevant laws.
The drain pipes used should be made of rigid PVC. (Locally procured)
Ensure that the piping has no vertical bends (downward or upward) to avoid the
accumulation of drain water in the collective pipings.
Also, attach supports to avoid the pipes from loosening.
Accessories Drain hose
7 Installing the Outdoor Unit
outside
Hose /
inside
Exhaust piping
Give a 1/50 downward
pitch to the drain port
– 25 –
SiAUY361411EA
Condensed water
drain piping
Drain port
* Drain hose
Bore of hole
open to
atmosphere:
50 mm or
more
* Install the drain hose so that
it is not removed from the
hole open to atmosphere.
022636-00E01
0FGHP-EN0801 DGJ002
Device Overview