Drain Piping - Hitachi RPFC-3.0UFE1NH Installation & Maintenance Manual

INSTALLATION AND MAINTENANCE

5 Drain piping

• Install the drain piping.
• Make sure that the drain works properly.
• The diameter of drain pipe connection hole should be the
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.
Indoor unit
!
CAUTION
Water accumulation in the drain piping causes drain clogging.
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
from causing water leakage.
• Drain pipes 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
18 HO2019291HA
Refrigerant pipes
Drain pipe
connection hole
Indoor unit
Sealing material
! CAUTION
Drain piping connections:
• Do not connect the drain directly to sewage pipes with smell of
ammonia. The ammonia in the sewage might enter the indoor
unit through the drain pipes and corrode the heat exchanger.
• Do not twist or bend the drain hose, with excessive force,
otherwise it may cause leakage.
• After piping work is finished, check whether 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.
Refrigerant pipes
Bucket