Piping Preparation - LG MULTI F Installation Manual
Multi-zone heat pump systems
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- Engineering manual (224 pages) ,
- Installation manual (65 pages) ,
- Install (9 pages)
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GENERAL INSTALLATION GUIDELINES
Piping Preparation
•
•
Do not braze in an enclosed location, and always test for gas leaks before / after brazing.
•
Outdoor Unit Pipe Connections
1.
Do not use kinked pipe caused by excessive bending in one specific area on its length.
2. Braze the pipes to the service valve pipe stub of the outdoor unit.
3. After brazing, check for refrigerant gas leaks.
4.
comply with local, state, or federal standards.
Creating a Flare Fitting
One of the main causes of refrigerant leaks is defective flared con-
nections. Create flared connections using the procedure below.
1. Cut the pipe to length.
• Measure the distance between the indoor unit and the outdoor unit.
• Cut the pipes a little longer than measured distance.
2A. Remove the burrs
• Completely remove all burrs from pipe ends.
• When removing burrs, point the end of the copper pipe down to
avoid introducing foreign materials in the pipe.
2B. Remove the flare nuts attached to the indoor and outdoor units.
Slide the flare nut onto the copper tube.
3. Flaring the pipe end.
• Use the proper size flaring tool to finish flared connections as
shown.
•
• Firmly hold copper tube in a bar with a dimension as indicated in
the table below.
4. Carefully inspect the flared pipe end.
• Compare the geometry with the figures and dimensions as
detailed.
• If the flare is defective, cut it off and re-do procedure.
• If flare looks good, blow clean the pipe with dry nitrogen.
Figure 14: Dimensions of the Flare.
90°
2
A
R=0.4~0.8
24
Table 9: Flared Connection Dimensions.
Outside Diameter
A
Inch
Inch
Ø1/4
0.04 ~ 0.05
Ø3/8
0.06 ~ 0.07
Ø1/2
0.06 ~ 0.07
Ø5/8
0.06 ~ 0.07
Ø3/4
0.07 ~ 0.08
Due to our policy of continuous product innovation, some specifications may change without notification.
©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. "LG" is a registered trademark of LG Corp.
Copper
1.
tube
90°
Pipe
2A.
Reamer
Point
down
3.
Bar
Bar
"A"
Copper pipe
Clamp handle
Inside is shiny with no scratches
4.
Smooth
Slanted
Even length
F
MULTI
F
MULTI
MAX
Slanted Uneven Rough
2B.
Flare nut
Copper
tube
Handle
Yoke
Cone
Red arrow
Incorrect Flares
Damanged
Cracked
Uneven
surface
thickness
- Quick Links:
- Refrigerant Charge
- Error Codes
- Troubleshooting
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