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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.
©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
Setting Up the Heat Recovery Unit (Heat Recovery Systems Only)
SW02M
(Dip switch for setting up
HR unit functions)
SW03M SW04M
SW01M/SW03M/SW04M
(Switch for manual valve
addressing)
SW01M
SW05M
(Switch for
addressing
HR unit)
LED
display
No. 1 valve housing
No. 1 cooling valve
LED (green)
No.1 heating valve
LED (red)
Figure 83:Heat Recovery Unit PCB Dip Switches.
PRE-COMMISSIONING
General
Each heat recovery unit will have a unique address
assign so the outdoor unit will be able distinguish it
from other heat recovery units. The unique address
is assigned by adjusting the rotary dials on the heat
recovery unit printed circuit board (PCB).
Upon completion of the heat recovery unit address,
the heat recovery unit operating parameters will be set
by adjusting the positions DIP Switches on SW01M,
SW02M.
Procedure
Before beginning the physical process of assigning heat
recovery addresses, map out the address assignments
using a copy of the LATS tree mode diagram.
Guidelines
1. Addresses must be sequential and addresses can-
not be skipped.
2. Assign the lowest address to the heat recovery unit
that has the largest capacity indoor unit connected to port number 1. If the capacity of all indoor units connected to port number 1 of each
heat recovery unit is the same, assign address “0” to the heat recovery unit farthest away from the outdoor unit. Assign the next address
to the next farthest away and so on until all heat recovery units have an address. The heat recovery unit with the highest address should
be the one closest to the outdoor unit. Up to 16 boxes can be on a single system.
Setting up the Heat Recovery Unit
(Heat Recovery Systems Only)
Addressing must be performed following the detailed steps above because port number 1 on the heat recovery unit addressed “0” will
remain open during the auto pipe detect procedure. If the indoor unit capacity connected to the port is relatively small compared with
other units on the system, the outdoor unit high head pressure safety will trip and shut down the unit during the procedure.
Possible settings in order of lowest to highest are: 0,1,2,3,4,5,6,7,8,9,A,B,C,D,E,F.
3. Record the address assigned to each heat recovery unit in the pertinent column on the Pre-Commissioning Device Configuration
Worksheet.
Figure 84:Adjusting the Heat Recovery Unit Addresses.
• SW05M must be set to "0"’
when installing only one
heat recovery unit.
• When installing mul-
tiple heat recovery units,
address each unit with
sequentially increasing
numbers starting from "0".
1
2
3
4
1
2
3
4
1
2
3
4
AB AB AB
SW05M Function (Rotary Switch for Addressing Heat Recovery Units)
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