LG Multi V Water IV - Electrical Connections: Zone Control of Indoor Units; Zone Control Connection Methods; Typical IDU Zone Control Wiring Diagram

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MULTI V Water IV System Installation Manual
Due to our policy of continuous product innovation, some specifications may change without notification.
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ELECTRICAL CONNECTIONS
Zone Control of Indoor Units
Heat Recovery Unit
Capped
(Port Not Used)
Zoning Control Group 1
▪ One wall controller for all IDUs in group
▪ Maximum of 8 IDUs
▪ All IDUs must be in same mode
Heat Recovery Unit
Master WSU
CEN B
IDU AIDU B
SODU A
Connect 2-Wire Communication Cable
to IDU B and IDU A Terminals at WSU
Zoning Control Group 2
▪ One wall controller for all IDUs in group
▪ Maximum of 8 IDUs
▪ All IDUs must be in same mode
Individually Controlled IDUs
▪ One wall controller for each IDU
▪ IDUs can be in different modes
Refrigerant Pipe
WSU to IDU Communication Cable
Wall Controller to IDU Communication Cable
Zone Control Connections
Up to eight indoor units can be connected to one port of a heat recovery unit and can be controlled as a group. Figure 75 shows a typical ap-
plication with both zone controlled and individually controlled IDUs. The WSU to IDU communications bus must be connected in a daisy chain
configuration from IDU to IDU. For zone control of multiple IDUs, the control communications cable from the wall controller must connect first
to the master IDU and then is daisy chained to the other IDUs in the zone. Controlling IDUs individually requires one wall controller per IDU.
Note:
• The capacity of the indoor units on one port of a heat recovery unit
(the zone) cannnot exceed 54kBtu/h.
• The maximum total capacity of indoor units connected to one
PRHR042A Heat Recovery Unit cannot exceed 192kBtu/h.
• The maximum number of indoor units connected to one PRHR042A
Heat Recovery Unit is 32.
• The maximum number of indoor units connected to one port of a
PRHR042A Heat Recovery Unit is 8.
• All indoor units in a zone must be in the same mode, eitther heating
or cooling. Auto Changover and Mode Override functions are not
available in zone control.
Figure 75: Typical IDU Zone Control Connections