Refrigerant Piping & Refrigerant Charge - Hitachi UTOPIA ES Serie Bedienungsanleitung

REFRIGERANT PIPING & REFRIGERANT CHARGE
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Suspended unit
1 Suspend the unit as the drawing
indicates.
2 Ensure that wall can resist the
Outdoor unit weight indicated in
specification label plate.
3 It is recommended to select
each foot support to bear the
full weight of the unit (in order to
consider stress fatigue applied
when unit is working too).
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Installing location where the unit will be exposed to strong wind
Follow the instructions below to
install on the rooftop or a location
without surrounding buildings, where
strong wind is expected against the
product.
1 Choose a location where the
outlet or inlet side of the product
will not be exposed to strong
wind.
2 When the outlet is exposed to
strong wind:
Direct strong wind may cause
lack of air flow and adversely
affect to the operation.
8 REFRIGERANT PIPING & REFRIGERANT CHARGE
8.1 PIPING MATERIALS
1 Prepare locally-supplied copper pipes.
2 Select the piping size with the correct thickness and correct
material which can 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 life cycle compared to that of a poorly prepared system.
Take particular care to ensure all copper piping is clean and dry internally.
There is no refrigerant in the cycle of the indoor unit.
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C A U T I O N
• Cap the end of the pipe when pipe is to be inserted through a hole
7 PMML0394B rev.0 - 11/2015
Wall bracket (*)
Anchor Bolts (*)
(*) Field supplied
• 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(s) and the outdoor unit.
• If not insulated, dew will occur on the piping surface.
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C A U T I O N
Pay attention to the following for installation:
• Installation shall ensure that outdoor
unit will not incline, vibrate, make noise
or fall down by a blast of wind or in an
earthquake. Calculate quake-resistance
strength to ensure that installation is strong
enough against falling. Fix the unit with
wires (field supplied) when installing in a
location without walls or windbreak and
likely exposed to a blast of wind.
• To use a vibration-proof mat, fix four places
to the front and back.
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C A U T I O N
Excessive strong wind against the outdoor unit
outlet may cause inverse rotation and damage
the fan and motor.