Drain Piping; Refrigerant Piping Work; Piping Materials - Hisense Hi-Therma Series Service Handbook

8.3.7.3 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
● The drain nozzle is factory-supplied with a 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.
drain nozzle
rubber washer

8.3.8 REFRIGERANT PIPING WORK

Make sure that refrigerant piping installation complies with
the legislation EN378 and local legislation.

8.3.8.1 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.
● 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.
● 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.
●
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.
●
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.
141
Installation