Hisense Hi-Therma Serie Manual De Instalación Y Mantenimiento página 23

UNIT INSTALLATION
7.3 DRAIN PIPING
When the base of the outdoor unit is temporarily utilized as a
drain receiver and the drain water in it is discharged, one
drain nozzle is needed.
The drain nozzle should be inserted into the base of the
outdoor unit up to the extruded portion.
drain pipe
drain nozzle
8 REFRIGERANT PIPING WORK
!
C A U T I O N
Make sure that refrigerant piping installation complies with the
legislation EN378 and local legislation.
8.1 PIPING MATERIALS
1 Prepare field-supplied copper pipes.
2 Select the piping size with the correct thickness and
correct material which have sufficient pressure
strength.
3 Select clean copper pipes. Make sure there is no dust and
moisture inside. Blow the inside of the pipes with oxygen
free nitrogen to remove any dust and foreign materials
before connecting pipes.
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N O T E
• A system with no moisture or oil contamination will give
maximum performance and lifecycle compared to that of a poorly
prepared system. Take particular care to ensure all copper piping
is clean and dry internally.
!
C A U T I O N
• All external piping shall be selected in size and dimension avoiding
any mechanical strength due to contraction or expansion, vibration
or refrigerant pulsation.
• All the piping shall be protected against any environmental effect like
water freezing, corrosion, etc. When flexible pipe is used,
precautions shall be taken against mechanical damages, excessive
stresses by torsion or any other.
• Flare nut connections shall be accessible for maintenance purposes.
• Ensure that refrigerant piping is earthed prior to units interconnection
and in case of additional refrigerant charging is required.
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N O T E
• The drain nozzle is factory-supplied with a rubber washer.
rubber washer
drain nozzle
• A drain pipe(inner diameter:15mm) should be field-supplied.
•
Do not use this drain nozzle in a cold area, because the drain
water may freeze.
• Please install the drain nozzle before the refrigerant piping work.
• Cap the end of the pipe when pipe is to be inserted through a hole.
• Do not put pipes on the ground directly without a cap or vinyl tape at
the end of the pipe.
• If piping installation is not completed until next day or over a longer
period of time, braze off the ends of the piping and charge with
oxygen free nitrogen through a Schrader valve type access fitting to
prevent moisture and particle contamination.
!
C A U T I O N
• Do not use insulation material that contains NH3 because it can
damage cooper pipe material and can be a source of future
leakage.
Completely insulate both refrigerant gas piping and liquid piping
•
between the indoor unit and the outdoor unit. If not insulated,
dew will occur on the piping surface.
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