General Data - LG MULTI F Installation Manual
Multi-zone heat pump systems
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GENERAL DATA
R410A Refrigerant
R410A refrigerant has a higher operating pressure in comparison to R22 refrigerant and, therefore, all piping system materials installed must
have a higher resisting pressure than the materials traditionally used in R22 systems.
R410A refrigerant is an azeotrope of R32 and R125, mixed at 50:50, so the ozone depletion potential (ODP) is 0.
WARNING
Do not place refrigerant cylinder in direct sunlight. Refrigerant cylinder may explode causing severe injury or death.
Note
• Because R410A is a combination of R32 and R125, the required additional refrigerant must be charged in its liquid state. If the refrigerant is
charged in its gaseous state, its composition changes and the system will not work properly.
Do not heat piping more than necessary during installation. Piping may become soft and fail when pressurized.
•
Do not use any piping that has not been approved for use in high-pressure refrigerant systems. Piping wall thickness must comply with
•
the applicable local, state, and federal codes for the 551 psi design pressure of R410A. Inadequate piping may fail when pressurized.
Allowable Indoor Unit to Outdoor Unit Connections
In Multi F / Multi F MAX multi-zone systems, the Ceiling Cassette IDUs can be connected to the Multi F outdoor units (ODUs) listed in the
table below.
Indoor units
Indoor Unit Nominal
Model Number
LMCN077HV
LCN097HV4
LCN127HV4
LMCN185HV
connection allowed:
connection not allowed:
Device Connection Limitations
• The minimum number of connected and operating indoor units to Multi F / Multi F MAX systems is two.
• The maximum number of indoor units for each Multi F / Multi F MAX heat pump system is:
LMU18CHV = 2
LMU24CHV = 3
• The maximum allowable total indoor unit capacity (Btu/h) for each Multi F / Multi F MAX heat pump system is:
LMU18CHV = 24,000
LMU24CHV = 33,000
• Refer to the Multi F Engineering Manual to properly determine total indoor unit connected capacity.
12
Table 4: Allowable Indoor Unit to Outdoor Unit Connections.
LMU18CHV LMU24CHV LMU30CHV LMU36CHV LMU480HV LMU540HV LMU600HV
Capacity (Btu/h)
2
7,000
O
9,000
O
12,000
O
18,000
–
O
–
LMU30CHV = 4
LMU30CHV = 40,000
LMU36CHV = 48,000
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.
Outdoor units
Maximum No. of Connectable Indoor Units
3
4
O
O
O
O
O
O
O
O
LMU36CHV = 4
LMU480HV = 8
LMU480HV = 65,000
LMU540HV = 73,000
MULTI
MULTI
4
8
8
O
O
O
O
O
O
O
O
O
O
O
O
LMU540HV = 8
LMU600HV = 8
LMU600HV = 81,000
F
F
MAX
8
O
O
O
O
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