Drain Piping - Hitachi air Core 600 Installation & Maintenance Manual

6. Drain Piping

● Do not create an upper-slope or rise for the drain piping, since drain water can flow back to the
indoor unit causing leakage into the room when the system operation is stopped.
● Do not connect the drain pipe with sanitary or sewage piping or any other drainage piping.
● When the common drain piping is connected with other indoor units, the connected position of each
indoor unit must be higher than the common drain pipe. The Pipes must be sized properly based on system
capacity.
● After performing drain piping work and electrical wiring, check to ensure that water drains properly per the
following procedure.
● Checking with the Float Switch:
(A) Switch ON the power supply.
(B) Start cooling operation.
(C) Gradually pour 64~80.6 oz(2~2.5 liters) of water into the drain pan through the access door or the air
outlet.
(D) Check to ensure that the water flows out at the end of drain piping and no water leakage occurs.
When water cannot be found at the end of drain piping, pour another 64 oz(2 liters) of water into the
drain pan.
●
If pouring water through the access door.
(1) Prepare a polyvinyl chloride pipe with a 32mm outer diameter.
(2) Fasten the tubing to drain hose with the adhesive agent and factory-supplied clamp. The drain piping must be
performed with a down-slope pitch of 1/25 to 1/100.
Hose Band
Drain Pipe
(Accessory)
Connection
* The total length of a+b+c(mm) : a+b+c≤1000
* In case of lifting the drain pipe at outlet part, perform the drain piping work as shown in the above figure.
(3) Insulate the drain pipe after connecting the drain hose.
Insert the end of hose
between heat exchanger
and drain pan.
Access Door
Pump
Water
Hose Band
(Accessory)
1/25 to 1/100
Down-Slope
Drain House
(Accessory)
Vinyl Chloride
(Field Supplied)
Drain House
(Accessory)
Installation and Maintenance
●
To add water through the air outlet use the diagram
below for guidance.
Insert the end of hose
between heat exchanger
and drain pan.
Upward Slope
Unit
1/25 to 1/100 Down-Slope
Common Drain Piping
This drain pipe shall be
separating from other pipes
34
Drain Pan
Pump
Water
Rising part
Drain Pipe
Connection