Mechanical Specifications - LG MULTI V 5 Engineering Manual

Multi V Heat Recovery Units
General
Multi V heat recovery units are for use with Multi V heat recovery outdoor units to permit simultaneous
heating and cooling operation.
Heat recovery units have two (2), three (3), or four (4) ports for connections to indoor units. Each port
is capable of connecting from one (1) indoor unit up to eight (8) indoor units up to a maximum nominal
recovery unit ports twinned together with a Y-branch kit.
Heat recovery ports can operate in heating or cooling mode independently, regardless of the mode of
any other port on the unit or in the system except where heat recovery unit ports are twinned. Heat recovery units contain one double spiral
subcooling heat exchanger per port, are internally insulated, and do not require a condensate drain.
Casing and Construction
Heat recovery units are completely factory assembled, internally piped, wired, and are designed for indoor installation. Casing is constructed
of galvanized steel, and houses piping, valves and controls to divert refrigerant controlling each port to operate in either heating or cooling
mode. Heat recovery units contain one double spiral subcooling heat exchanger per port, are internally insulated, and do not require a con-
densate drain.
Refrigerant Valves
Each heat recovery port is circuited with two two-position solenoid valves to control R410A refrigerant flow path to allow indoor units to oper-
ate in heating or cooling mode.
Refrigerant Piping
Units can be piped in series and / or parallel to optimize cost between material and labor. Up to 16 heat recovery units can be piped in series,
parallel, or a combination of series and parallel to optimize cost between material and labor. Any series string of heat recovery ports/units
can connect up to 192MBh of indoor unit nominal capacity.
• Indoor units up to 131 equivalent feet of piping length from the Heat Recovery unit to which it is connected.
• Indoor units up to 295 equivalent feet of piping length from the first branch.
• Difference between highest and lowest elevation indoor units piped to separate parallel heat recovery units (HRUs) up to 131 feet in
elevation.
• Difference between highest and lowest heat recovery units piped in parallel up to 49 feet in elevation.
• Difference between highest and lowest elevation heat recovery units piped in series up to 16 feet in elevation.
• Elevation difference of series connected heat recovery units cannot exceed 16 feet.
All refrigerant lines from the outdoor unit to the heat recovery units, and from the heat recovery units to the indoor units must be separately
field insulated.
Electrical
Heat recovery units require 208-230V, 1-phase, 60 Hz electrical power, and are capable of operation within ±10% of nominal voltage.
Controls
Heat recovery units include factory-installed control boards with integral microprocessors. Heat recovery unit control boards communicate
with the main control board in the outdoor unit and interface with the VRF equipment controls system. The control circuit between the indoor
units, heat recovery units and the outdoor unit is RS-485 daisy chain communication over two-conductor, stranded and shielded, 18 AWG
cable.

MECHANICAL SPECIFICATIONS

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Heat Recovery Units
Four-port Heat Recovery Unit.
HRU PRODUCT DATA | 75