Drain Piping - Hitachi RPC-2.0FSR Installation & Maintenance Manual

6.

Drain Piping

Perform the drain piping work after connecting the
refrigerant pipes and attaching insulations.
Do not insert the drain pipe for the indoor unit
to the drainage trench where corrosive gases
occur. Poisonous gases flow into the room, so
that may cause the poisoning.
● Do not create an upper-slope or rise for the drain
piping, since drain water can flow back to the
indoor unit and leakage into the room will occur
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
piping. The pipe size of the common drain pipe
must be large enough according to the unit size
and number of units.
● After performing drain piping work and electrical
wiring, check to ensure that water flows smoothly
as in the following procedure.
(1) Connecting Direction of Drain Pipe
The standard direction of drain piping
connection is right side as viewed from
front. However, it can be performed from the
left side when it is required due to building
construction.
Left Side
A10762300A-rev.1
Right Side
(Refrigerant Pipe
Connection)
< For Left Side Drain Piping >
Left Side
Cord Clamp
Drain Pan
Remove the drain plug.
Right Side
Insert the drain plug into
the drain boss by using a driver.
Driver
Drain Plug
Wrap the insulation around
the drain pipe connection.
Drain Plug
Silicon Sealant
(2) Connecting Drain Hose
(a) Insert the hose into the hose clamp.
(b) Push the drain hose onto the drain boss
until the hose reaches the end of drain
pan. (If the drain hose is not inserted
completely, it causes water leakage.)
(c) Tighten the screw for hose clamp to face
the screw part downward as shown in the
figure below to prevent dew drop.
(d) Wrap the insulation (accessory) around
the hose clamp to cover drain hose, drain
pan, hose clamp without gap. (If there is
gap, dew drop may occur.)
Insulation
Drain Plug
Drain Boss
19