12
Installation
Installing Refrigerant Piping
Connect field-supplied piping using flared connections (not supplied) or by brazing. The large unit
port is for gas refrigerant; the small one is for liquid refrigerant.
Cut or extend field-supplied piping as needed. Use the following procedures.
NOTICE
System Failure!
If brazing is used for pipe connections, a nitrogen purge is required to prevent the formation of
copper oxides inside the piping. Failure to follow this procedure could damage the system.
•
Before connecting the pipes, make sure they are free of dirt and debris.
•
Use insulated, unwelded, degreased, and deoxidized copper pipe (Cu-DHP type according to
ISO 1337 or UNI EN 12735-1) suitable for an operating pressure of at least 609.15 psi (4200 kPa)
and a burst pressure of at least 3002.28 psi (20,700 kPa). Copper pipe for hydro-sanitary
applications is unsuitable.
•
For sizing and limits (height difference, line length, maximum bends, refrigerant charge, and
so on) see the outdoor unit installation manual.
•
All refrigerant connections must be accessible for servicing and maintenance.
Pipe Cutting
Required tools:
•
Pipe cutter
•
Reamer
•
Pipe holder
1.
Using a pipe cutter, cut the pipe so that the cut edge is at 90° to the side of the pipe.
2. Use a reamer to remove all burrs at the cut edge.
See examples of correctly and incorrectly cut pipes.
Correct: 90º
Oblique
Rough
Burr
Flared Pipe Connections
Clutch type and wing nut type flare tools are available for flared pipe connections.
3. Slide the flare nut over the pipe to be flared.
4. Slide the end of the pipe into the hole on the flaring bar that fits the pipe, leaving a length of
pipe, determined by tool type (see table), extending above the flaring bar. Clamp it down.
Length of pipe extending above flare bar
Pipe
Flaring
bar
