Drain Piping; General Information - Hitachi AirCore 700 Operation Installation Maintenance Manual

5. Drain Piping

5. Drain Piping

5.1 General Information

INCORRECT
CAUTION
!
•
Do not create an upper-slope or rise for the drain piping, since drain water will flow back to the unit
and leakage to the room will occur when the unit 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 piping. The pipe size of the common drain pipe must be
large enough according to the unit size and number of unit.
•
Drain piping will require insulating if the drain is installed in a location where condensation forming
on the outside of drain pipe may drop and cause damage. The insulation for the drain pipe must be
selected to insure vapor sealing and prevent condensation forming.
•
Drain trap should be installed next to indoor unit. This trap must be designed to good practice and
be checked with water (charged) and tested for correct flow. Do not tie or clamp the drain pipe and
refrigerant pipe together.
NOTES:
•
Install drainage in accordance with national and local codes.
•
After performing drain piping work and electrical wiring, check to ensure that the water flows
smoothly as in the following procedure.
Checking with drain-up mechanism and float switch
•
Switch ON the power supply.
•
Pour approximately 2.0 to 2.5 liters of water gradually into the drain pan, then float switch up and
drain pump start working automatically.
•
Check to ensure that the water flows smoothly inside the transparent drain pipe connection whether
no water leakage occurs. When water cannot be found at the end of the drain piping, pour more water
smoothly into the drain pan.
•
If the water overflows from the drain pan, recheck the drain piping.
•
Switch OFF the power supply after.
NOTE:
•
Pay attention to the thickness of the insulation when the left side piping is performed. If it is too thick,
piping can not be installed in the unit.
CORRECT
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