Carrier XCT7 Installations- Und Benutzerhandbuch Seite 27

Installation Procedure
Pipe installation
Important
• Please don't let the pipe and the parts in the unit collide with each other.
• When connecting the pipes, please close the valves fully.
• Protect the pipe end to keep water and impurities out of the pipes
• Bend the pipe in to a large semi-circle as much as possible (over 4 times the pipe diameter).
• The connection between the outdoor liquid pipe and the distributing pipe is a flared type. Please expand the pipe
with a special tool for R410A after installing the expanding nut. However, if the projecting pipe length has been
adjusted with the copper pipe gauge, you can use the original tool to expand the pipe.
• Since the unit is with R410A, the expanding oil will be ester oil and not the mineral oil.
• When connecting the expanding pipe, fasten the pipes with a double spanner. The torque refers to the former
info.
• Both the outdoor gas pipe and the refrigerant distribution pipe, as well as the refrigerant distribution pipe and the
branch pipe should be welded with hard solder.
• Charge the nitrogen while welding the pipe or it will cause a number of impurities (a film of oxidation) to clog the
capillary and the expansion valve, further causing the deadly failure.
Operation procedure
• Wield the pipe at the same time while charging the
nitrogen, or it will cause a number of impurities
(a film of oxidation) to clog the capillary and the
expansion valve, further causing failure
• Protect the pipe end against water and
impurities (welding after being flattened or
being sealed with an adhesive tape).
• The refrigerant pipe should be clean. The nitrogen should flow under the
pressure of about 0.5MPa and when charging the nitrogen,
stop the end of the pipe by hand to enhance the pressure in the pipe,
then loosen i
• When connecting the pipes, close the valves fully.
• When welding the valve and the pipes, use a wet cloth to cool them down.
Seal the pipe end with an adhesive tape or the stopper to
increase the resistance, fill up the pipe with nitrogen
Only nitrogen gas
Flat
Brazing
Source valve
20
Taping
can be used
Brazing
Adhesive tape
1st side 2nd side
Hand