MULTI F MAX BD UNIT
Mechanical Specifications
Branch Distribution Unit
General
Branch distribution units are designed for use with LG Multi F MAX (LMU540HV)
outdoor units, and are internally piped, wired, assembled and run-tested at the
factory. The branch distribution unit is used as an intermediate refrigerant control
device between the outdoor unit and the indoor units to effectively and efficiently
control the heating or cooling operation of the system through the use of electronic
expansion valves.
Refrigerant System
System is designed for use with R410A refrigerant. All refrigerant lines from the
outdoor unit to the branch distribution unit, and from the branch distribution unit to
the indoor units, must be field insulated. The units may be connected to optional
field-supplied and field-installed isolation valves for servicing without evacuating
the entire system.
Piping Capabilities
Maximum piping length from the branch distribution unit to the indoor unit is 49.2
equivalent feet. Maximum elevation difference between branch distribution unit and
indoor unit is 32.8 feet. Maximum elevation difference between two parallel branch
distribution units is 49.2 feet.
Electrical
Each branch distribution unit is designed to operate using 208–230/60/1 power
with voltage variances of ±10%.
Casing
The casing is designed to mount fully concealed above a finished ceiling, is manufactured of galvanized steel plate, and is internally
insulated. Branch distribution units do not require a condensate drain.
Port Assembly
Branch distribution units have a two-pipe system consisting of one vapor pipe and one liquid pipe. Units are available in a choice of two
(PMBD3620), three (PMBD3630) or four ports (PMBD3640 and PMBD3641); branch distribution units include two, two-positioned solenoid
valves per port. Each port for PMBD3620, PMBD3630, and PMBD3640 units connect to one indoor unit for a maximum nominal capacity of
24,000 Btu/h. For PMBD3641 units, ports A, B, C each connect to one indoor unit for a maximum nominal capacity of 24,000 Btu/h; port D
connect to one indoor unit for a nominal capacity of 36,000 Btu/h. Maximum nominal capacity per branch distribution unit is 73,000 Btu/h.
Two branch distribution units can be piped in parallel using accessory Y-branch kit PMBL5620.
Controls
The unit is provided with factory-installed control boards and an integral microprocessor to communicate with the main control board in the
outdoor unit. Communication between the branch distribution unit, the outdoor unit, and the indoor units is accomplished through a 18 AWG,
four-core, stranded and shielded power / communication cable.
Figure 27:
PMBD3620 Two-Port Branch Distribution Unit.
Figure 28:
PMBD3630 Three-Port Branch Distribution Unit.
Figure 29:
PMBD3640 and PMBD3641 Four-Port Branch
Distribution Unit.
BD UNIT | 333
Branch Distribution (BD) Unit Data
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.
MULTI
F
MAX
MULTI
F