Drain Piping - Hitachi RPFC-2.0UNE1NH Installation And Maintenance Manual

5. Drain Piping

·
Install the drain piping
·
Make sure the drain works properly.
·
The diameter of drain pipe connection hole should
be same as that of the drain pipe.
·
Keep the drain pipe short and sloping downwards at
a gradient of at least 1/100 to prevent air bubbles.
Correct
INDOOR
UNIT
CAUTION
Water accumulation in the drain piping causes drain
clog.
To keep the drain pipe from sagging, fix space
hanging wires at an interval of 1 to 1.5m.
·
Use the drain hose and the clamp. Insert the drain
hose fully into the drain socket and firmly tighten the
drain hose and insulation material with the clamp.
·
The below areas should be insulated to prevent
condensation causing water leakage.
·
Drain piping passing indoors
·
Drain sockets.
Referring the figure below, insulate the drain socket
and drain hose using the large sealing pad (provided as an
accessory).
Sealing material
Drain hose
Refrigerant pipes
Drain pipe connection hole
Incorrect
INDOOR
UNIT
Sealing material
Installation and Maintenance
CAUTION
Drain piping connections
·
Do not connect the drain directly to sewage pipes that
smell of ammonia. The ammonia in the sewage might
enter the indoor unit through the drain pipes and
corrodethe heat exchanger.
·
Do not twist or bend the drain hose, so that excessive
force is not applied to it.
This type of treatment may cause leaking.
·
After piping work is finished, check drainage flows
smoothly.
·
Gradually insert approximately 1000 cc of water into
the drain pan to check drainage in the manner
described below.
·
Gradually pour approximately 1000 cc of water from
the outlet hole into the drain pan to check drainage.
·
Check the drainage.
15
Refrigerant
pipes
Bucket