LG Multi V Water IV - Pre-Commissioning: Heat Recovery Unit Configuration; Configure Heat Recovery Unit Settings; Heat Recovery Unit Model Selection Guide

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Pre-commissioning and Maintenance
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Factory Setting
One port
connected
Two ports
connected
Three ports
connected
Four ports
connected
Table 69:Selecting the Heat Recovery Unit Model.
Each heat recovery unit has dip switches No. 2 and No. 3 factory set as shown above in initial setting.
• To use a PRHR021A for one port, cap off the second pipe, and set the dip switches on the heat recovery unit for "one port
connected" as shown in the table above.
• To use a PRHR031A for two ports, cap off the third port, and set the dip switches on the heat recovery unit for "two ports
connected" asshown in the table above.
• To use a PRHR041A for three ports, cap off the fourth port, and set the dip switches on the heat recovery unit for "three ports
connected"as shown in the table above.
• To use a PRHR041A for two ports, cap off the third and fourth ports, and set the dip switches on the heat recovery unit for "two
ports connected" as shown in the table above.
• Any unused port must be sealed with a brazed copper cap, not with a plastic cap.
PRHR031A (Three [3] ports)PRHR021A (Two [2] ports) PRHR041A (Four [4] ports)
1
2
3
1
2
1
3
2
4
ON
OFF
1
2
345678
1
2
3 4 567 8
ON
OFF
1
2
3 4 567 8
ON
OFF
1
2
345678
ON
OFF
1
2
345678
ON
OFF
1
2
3 4 567 8
ON
OFF
1
2
3 4 567 8
ON
OFF
1
2
3456
78
ON
OFF
1
2
3456
78
ON
OFF
1
2
3456
78
ON
OFF
1
2
3456
78
ON
OFF
1
2
3 4 567 8
ON
OFF
Configure the Heat Recovery Unit Settings
1. Identify how many ports are connected (see Table 57).
2. Group ports if necessary. If any connected indoor units are “large” capacity models (indoor units with >54,000 Btu/h capacity) two heat
recovery ports must be “grouped” to serve a large capacity indoor using an inverted ‘Y” branch.
3. Set DIP Switches as outlined in Tables 57 and 58.
Setting Up the Heat Recovery Unit (Heat Recovery Systems Only)
PRE-COMMISSIONING