Refrigerant Piping Connections - LG MULTI F Installation Manual
Multi-zone heat pump systems
Hide thumbs
Also See for MULTI F:
- Engineering manual (224 pages) ,
- Installation manual (65 pages) ,
- Install (9 pages)
Table of Contents
Advertisement
F
MULTI
F
MULTI
MAX
Device Connection Limitations
• The minimum number of connected and operating indoor units to Multi F / Multi F MAX systems is two, taking into consideration the
minimum combination ratio.
• The maximum number of indoor units for each Multi F / Multi F MAX heat pump systems is:
LMU18CHV = 2
LMU24CHV = 3
Piping Length and Elevation Limitations
One of the most critical elements of Multi F and Multi F MAX systems is the refrigerant piping. The tables on the next few pages list pipe
length limits that must be followed in the design of Multi F and Multi F MAX refrigerant pipe systems.
Using Refrigerant Components
Field-supplied elbows are allowed as long as they are designed for use with
R410A refrigerant. The designer, however, should be cautious with the quantity
and size of fittings used, and must account for the additional pressure losses in
equivalent pipe length calculation for each branch. The equivalent pipe length of
each elbow must be added to each pipe segment.
Multi F Outdoor Unit Piping Length and
Elevation Limitations
Table 19: Multi F Refrigerant Piping System Limitations.
Outdoor Unit Model (Btu/h)
Max. Total System Piping Length (ft.)
Min. Length for One Branch (ft.)
Max. Length for One Branch (ft.)
Max. Elevation Between Each Indoor Unit
and Outdoor Unit (h1)
Max. Elevation Between Indoor Units (h2)
Max. Combination of Indoor Units
Multi F System Example
Example: LMU36CHV outdoor unit with four (4) indoor units
connected.
ODU: Outdoor Unit.
IDU: Indoor Unit.
A, B, C, D: Pipes from Outdoor Unit to Indoor Unit.
REFRIGERANT PIPING CONNECTIONS
LMU30CHV = 4
LMU36CHV = 4
LMU18CHV /
LMU24CHV /
18,000
24,000
164
246.1
A+B
A+B+C
9.8
9.8
82
82
49.2
49.2
24.6
24.6
24,000
33,000
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.
LMU480HV = 8
Table 20: Equivalent Piping Length for Elbows, Y-branches,
and Branch Distribution Units.
Component
Elbow (ft.)
Y-Branch Kit (ft., Multi F MAX
systems only)
Branch Distribution Unit (ft.,
Multi F MAX systems only)
1
Figure 41: Multi F Refrigerant Piping System
Limitations (LMU18CHV Example).
LMU30CHV /
LMU36CHV /
30,000
36,000
246.1
246.1
A+B+C+D
A+B+C+D
9.8
9.8
82
82
49.2
49.2
24.6
24.6
40,000
48,000
A
B
Max. 49.2 feet
C
D
LMU540HV = 8
LMU600HV = 8
Size (Inches)
1/4 3/8 1/2 5/8 3/4
0.5 0.6 0.7 0.8 1.2
1.6
1
8.2
A
h1
B
Max. 24.6 feet
h2
35
- Quick Links:
- Refrigerant Charge
- Error Codes
- Troubleshooting
Hide quick links:
Advertisement
Chapters
Table of Contents
Troubleshooting
