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3.8 Connecting the Refrigerant Tubing
The unit is supplied with plugged direct expansion coil: to ensure its tightness during storage and
transport, inside it is loaded nitrogen gas at a higher pressure than atmospheric.
CAUTION: Nitrogen is sealed inside the main unit. Before loosening the flare section, perform the fol-
lowing airtightness check. Use pliers or a similar tool to bend the end of the indoor unit hermetically
sealed tubing so that a crack is formed. Verify that a "pffft" sound occurs.
Unscrew the flare caps.
Preparation of pipes
•
Cut the copper tube to the required length with a tube cutter. It is recommended to cut approx. 30 – 50 cm longer than the tubing length
you estimate.
•
Remove burrs at each end of the copper tubing with a tube reamer or file. This process is important and should be done carefully to
make a good flare. Be sure to keep any contaminants (moisture, dirt, metal filings, etc.) from entering the tubing.
•
Remove the flare nut from the unit and be sure to mount it on the copper tube.
•
Make a flare at the end of the copper tube with a flare tool. A good flare should have the following characteristics:
- inside surface is glossy and smooth
- edge is smooth
- tapered sides are of uniform length
•
Apply a sealing cap or water-proof tape to prevent dust or water from entering
the tubes before they are used.
•
Be sure to apply refrigerant lubricant (ether oil) to the inside of the flare nut
before making piping connections. This is effective for reducing gas leaks.
•
For proper connection, align the union tube and flare tube straight with each
other, then screw on the flare nut lightly at first to obtain a smooth match.
•
Adjust the shape of the liquid tube using a tube bender at the installation site
and connect it to the liquid tubing side valve using a flare.
pag. 28
Installation, Use and Maintenance Manual - ERV+DX series
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