Drain Piping; Drain Pipe Connection - Hitachi RPK-0.8FSNH2M Installation And Operation Manual

4. DRAIN PIPING

4.1. GENERAL
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.
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

HP
INCORRECT
A B C
-
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.
NOTE:
Install drainage in accordance with national and local
codes.
„
Checking Unit without drain-up mechanism
-
-
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.
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