LG LMU18CHV, Engineering Manual, Page: 18 / 392

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18 | MULTI F OUTDOOR UNIT
Multi F and Multi F MAX Heat Pump System Engineering Manual
MULTI
F
MAX
MULTI
F
MULTI F OUTDOOR UNIT
General Data
Model Number
LMU18CHV LMU24CHV LMU36CHV
Rated Cooling Capacity (Btu/h)
1
17,000 20,000 32,000
Rated Heating Capacity (Btu/h)
1
22,000 24,000 36,000
Operating Range
Cooling (°F DB)
14
6
- 118 14
6
- 118 14
6
- 118
Heating (°F WB) -4 - 64 -4 - 64 -4 - 64
Compressor
Inverter Quantity Twin Rotary x 1 Twin Rotary x 1 Twin Rotary x 1
Oil/Type
FVC68D FVC68D FVC68D
Fan (Side Discharge)
Type Propeller Propeller Propeller
Motor Output (W) x Qty.
85.4 x 1 85.4 x 1 124.2 x 1
Motor/Drive Brushless Digitally Controlled / Direct
Maximum Air Volume (CFM)
1,766 1,766 2,119
Unit Data
Refrigerant Type
R410A R410A R410A
Refrigerant Control/Location EEV/Outdoor Unit EEV/Outdoor Unit EEV/Outdoor Unit
Min. Number Indoor Units/System
2
2 2 2
Max. Number Indoor Units/System
2
2 3 4
Maximum Allowable Total Indoor Unit
Connected Capacity (Btu/h)
24,000 33,000 48,000
Sound Pressure (Cooling / Heating) dB(A)
3
49 / 52 49 / 52 52 / 55
Net Unit Weight (lbs.) 100 100 137
Shipping Weight (lbs.)
108 108 148
Power Wiring
4
(No. x AWG) 3C x 14 3C x 12 3C x 12
Heat Exchanger
Material and Fin Coating Copper Tube/Aluminum Fin and GoldFin™/Hydrophilic
Rows/Columns/Fins per inch x Qty.
(2 x 28 x 14) x 1 (2 x 28 x 14) x 1 (2 x 38 x 14) x 1
Piping
Liquid Line Connection (in., OD) x Qty. 1/4 x 2 1/4 x 3 1/4 x 4
Vapor Line Connection (in., OD) x Qty.
3/8 x 2 3/8 x 3 3/8 x 4
Factory Charge lbs. of R410A 3.96 3.96 6.18
Piping Lengths
Maximum Total Piping (ft.)
5
164.0 246.1 246.1
Maximum Outdoor Unit to Indoor Unit Piping (ft)
82.0 82.0 82.0
Piping Length (No Additional Refrigerant [ft]) 49.2 73.8 98.4
Maximum Elevation between Outdoor Unit and
Indoor Unit (ft.)
49.2 49.2 49.2
Maximum Elevation between Indoor Unit and
Indoor Unit (ft.)
24.6 24.6 24.6
Table 12: Multi F Outdoor Unit Specifications.
1
Rated capacity applied with non-ducted indoor units, and is rated 0 ft. above sea level with 25 ft.
of refrigerant line per indoor unit and a 0 ft. level difference between outdoor and indoor units. All
capacities are net with a combination ratio between 95 – 105%.
Rated cooling capacity obtained with air entering the indoor unit at 80ºF dry bulb (DB) and 67ºF wet
bulb (WB) and outdoor ambient conditions of 95ºF dry bulb (DB) and 75ºF wet bulb (WB).
Rated heating capacity obtained with air entering the indoor unit at 70ºF dry bulb (DB) and 60ºF wet
bulb (WB) and outdoor ambient conditions of 47ºF dry bulb (DB) and 43ºF wet bulb (WB).
2
At least two indoor units should be connected. For allocated capacity information, see the combination
tables on pages 23 to 38.
3
Sound pressure levels are tested in an anechoic chamber under ISO Standard 3745 and are the
same in both cooling and heating mode. These values can increase due to ambient conditions during
operation.
4
All power wiring minimum 3-conductor, stranded, shielded, and must comply with applicable local and
national codes. For detailed electrical information, please refer to electric characteristics on page 279.
5
Piping lengths are equivalent.
6
Installation of an optional Low Ambient Wind Baffle Kit will allow operation down to -4°F in cooling
mode.