Hitachi EV-1.5N1, Руководство по обслуживанию

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3. Piping work and refrigerant charge
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SMGB0079 rev.0 - 01/2013
3
C A U T I O N
• Cap the end of the pipe when pipe is to be inserted through a wall 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, as it can damage copper pipe material and become a source
of future leakage.
• Insulate the unions and flare-nuts at the piping connection part completely.
• Completely insulate both refrigerant gas and liquid piping between the indoor unit and the outdoor unit to
avoid a decrease of performance; if not, dew will occur on the piping surface.
• Refrigerant circuit and Water circuit must be performed and inspected by a licensed technician and must com-
ply with all relevant European and national regulations.
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Insulation
Attach the pipe insulation to each branch using vinyl tape. Attach also insulation to field supplied pipes in order to prevent
the capacity decrease according to the ambient air conditions and dewing on the low pressure pipe surface.
1. Cap.
2. Field supplied insulation.
3. Do not make a gap.
N O T E
When polyethylene foam is applied, it is recommended the
usage of a wall thickness of 10 mm for the liquid piping and
15 mm to 20 m for the gas piping.
C A U T I O N
• Perform the insulation work after the pipe surface temperature decreases to the room temperature, if not the
insulation material may melt.
• If the ends of the piping system are open after ending the piping work, attach caps or vinyl bags securely to
the ends of the piping, avoiding moisture and dust entering.