LSN120HSV4 Owner's Manual

Multi F Standard Wall-Mounted Indoor Unit

Due to our policy of continuous product innovation, some specifications may change without notification.

MUL

GENERAL DATA

R410A Refrigerant

R410A refrigerant has a higher operating pressure in comparison to R22 refrigerant. 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. 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.

Indoor units Outdoor units

Model Number

Indoor Unit Nominal

Capacity (Btu/h)

LMU18CHV LMU24CHV LMU30CHV LMU36CHV LMU480HV LMU540HV

Maximum No. of Connectable Indoor Units

2 3 4 4 8 8

LMN078HVT 7,000 O O O O O O

LSN090HSV4 9,000 O O O O O O

LSN120HSV4 12,000 O O O O O O

LMN158HVT 15,000 O O O O O O

LSN180HSV4 18,000 – O O O O O

LMN248HVT 24,000 – O O O O O

Table 3: Allowable Indoor Unit to Outdoor Unit Connections.

Allowable Indoor Unit to Outdoor Unit Connections

In Multi F/Multi Zone systems, the standard wall-mounted IDUs can be connected to the Multi F outdoor units (ODUs) listed in Table 3.

connection allowed: O

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 LMU30CHV = 4

LMU36CHV = 4 LMU480HV = 8 LMU540HV = 8

• 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 LMU30CHV = 40,000

LMU36CHV = 48,000 LMU480HV = 65,000 LMU540HV = 73,000

• Refer to the Multi F Engineering Manual to properly determine total indoor unit connected capacity.