Drain Piping; Drain Pipe Connection - Hitachi RCIM-FSN2 Installation And Operation Manual

4

4 DRAIN PIPING

4.1. GENERAL
CAUTION:
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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 units.
CORRECT
-
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.

4.2. DRAIN PIPE CONNECTION

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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.
NOTE:
INCORRECT
„
-
-
-
-
NOTE:
Drain trap should be installed next to indoor unit. This
Install drainage in accordance with national and local
codes.
Checking with Drain-Up Mechanism and Float
Switch
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.