Due To Our Policy Of Continuous Product Innovation, Some Specifications May Change Without Notification - LG ARUM072BTE5 Installation Manual

INSTALLING FOR HEAT RECOVERY
OPERATION
Heat Recovery Units
Heat Recovery Unit Connections and Limitations
1. Series connection of heat recovery units: Total
capacity of indoor units ≤192,000 Btu/h.
2. Refer to the heat recovery unit PCB for valve group
control setting.
3. Maximum capacity of each port is 54,000 Btu/h and
eight (8) indoor units.
Do not skip ports when connecting indoor
4.
units. Start at port 1, then use 2, then use 3, then
use 4 (the numbers are displayed on the heat
recovery ports).
Removing the Caps
Before brazing the field-supplied refrigerant piping to the heat recovery unit connections, the caps MUST be removed from the liquid, high
pressure vapor, and low pressure vapor pipe connections.
Removing the caps releases any gas present in the heat recovery unit. If the gas isn't released, physical injury or death may occur from the uncon-
trolled rapid release of gas, or if the gas comes in contact with a flare during brazing and generates a poisonous gas.
On whichever port or pipe not used, the factory-provided cap must be removed, and that port / pipe must be recapped and insulated.
Table 37: Heat Recovery Unit Piping Connection Sizes.
Model
Number of Ports
To Indoor Units
Connecting Pipes
To Outdoor Units
Piping Connection Options
Heat recovery units can connect to the field-supplied refrigerant piping on the left side or on the right side. Heat recovery units can also be
installed in series / in parallel using these side connections.
Heat Recovery Unit Piping Connection Options.
Pipe Connection from Left Side
78
Close Up of the Heat Recovery Unit Connections.
Liquid Pipe
Low Pressure Vapor Pipe
High Pressure Vapor Pipe
Remove Caps Before
Brazing
Liquid Pipe (inches)
Vapor Pipe (inches)
Liquid (inches)
Low-pressure Vapor (inches)
High-pressure Vapor (inches)
Pipe Connection from Right Side

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

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Vapor Pipe Ø5/8, Liquid Pipe Ø3/8
Brazed Connections
PRHR022A PRHR032A
2 3
3/8
5/8
3/8 1/2
7/8 1-1/8
3/4 7/8
Series / Parallel Pipe Connection
3 4
1 2
PRHR042A
4
5/8
1-1/8
7/8