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Kaysun KRE-3100DX1 Manual

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7 - INSTALLATION AND START UP
7.8 DX COIL SECTION (FIG. 8)
The unit is supplied with plugged direct expansion coil by SAE/FLARS connections: 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 perform the following airtightness check, verify that a “pffft”
sound occurs, when the nut is unscrewed.
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
m
r file (A fig. 8).
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.
•Apply a sealing cap or water-proof tape to prevent dust or water from entering the tubes before they are used.
• Adjust the shape of the liquid tube using a tube bender at the installation site and connect it to the liquid tubing side
valve.
•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 (B fig.8).
•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 (C fig.
8). 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 (D fig. 8).
• Repeat operations for the second connecting pipeline.
pag. 20
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