T-H3 Installation Manual

38 Page
5. Between the “PARENT” and the “CHILD-1” units:
Connect the “PARENT” connector of the “PARENT” unit to the “1” connector of the “CHILD-1” unit
using the supplied linking cable.
6. Between the “CHILD-1” and the “CHILD-2” units:
Connect the “2” connector of the “CHILD-1” unit to the “1” connector of the “CHILD-2” unit.
7. Between the “CHILD-2” and the “CHILD-3” units:
Connect the “2” connector of the “CHILD-2” unit to the “1” connector of the “CHILD-3” unit.
8. Verify that all cables are connected like the diagram below (B).
9. Turn on power to the “PARENT” unit. Turn on “CHILD-1”. When the (remote and/or temperature)
controller displays a number, turn on “CHILD-2”.
When the (remote and/or built-in temperature) controller displays a number, turn on “CHILD-3”.
Make sure the (remote and/or built-in temperature) controllers display the unit #. The numbering
system automatically allocates the unit # to each water heater in the Easy-Link System, in accordance
with the table at right.
(Refer to p.53.)
(B) Basic diagram of connections between the Easy-Link System units
Installaon
Installaon Manual
Type of unit Unit # of easy-link Type of unit Unit # of easy-link
Parent 1 Child 2, 3, or 4
(A) 540 model computer board
PARENT unit
540
CHILD unit
540
CHILD unit
540
CHILD unit
540
PARENT
Communicaon cable
Connectors
Lower bank of
DIP switches
OFF
ON
1
1
1
12
2
2
2
PARENT PARENT PARENT
1
2
3
4
5
6
Connectors Connectors Connectors
1
2
3
4
5
6
OFF
ON
OFF
ON
1
2
3
4
5
6
OFF
ON
1
2
3
4
5
6
Lower bank of
DIP switches
Lower bank of
DIP switches
Lower bank of
DIP switches
Built-in/
remote
controller
 The dark squares indicate the correct position of the DIP switch.
 When 540P is a PARENT unit in an Easy-Link System, refer to the 540P manual for
DIP switch settings.
 Either a built-in controller or a remote controller is required for the Easy-Link
System for ease of usage and maintenance.
NOTICE
WARNING
 To change the DIP switch settings for the Easy-Link System, locate the lower
bank of DIP switches at the bottom left of the computer board of 540.
 DO NOT adjust any other DIP switches .
 Turn off the power supply to the water heater before changing the DIP switch
settings.
 Failure to observe this warning could result in carbon monoxide poisoning or death.
PARENT
Lower bank of DIP switches
Upper bank
of
DIP switches
Easy-Link /

connectors
are next to
the computer
board.
H3 DIP switch settings for Easy-Link System
Lower bank of DIP switches
PARENT CHILD
Connection
with 710
1
2
3
4
5
6
OFF
ON
No. 1 ON
1
2
3
4
5
6
OFF
ON
No. 1 OFF
1
2
3
4
5
6
OFF
ON
No. 6 ON