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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 built-in 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.58.)
(A) 540H model computer board
Upper bank
of
DIP switches
Lower bank of DIP switches
• 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 540H.
• DO NOT adjust any other DIP switches .
• Turn off the power supply to the water heater before changing the DIP switch set-
WARNING
tings.
• Failure to observe this warning could result in carbon monoxide poisoning or death.
(B) Basic diagram of connections between the Easy-Link System units
PARENT unit 540H
Connectors
Lower bank of
DIP switches
Communication cable
• The dark squares indicate the correct position of the DIP switch.
• When the 540P, 710, or 520 is a PARENT unit in an Easy-Link System, refer to the
NOTICE
respective 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.
Type of unit
Unit # of easy-link
Parent
Easy-Link /
Multi-Unit
connectors
are next to
the computer
CHILD unit 540H
Connectors
Built-in/
remote
controller
Lower bank of
DIP switches
39
Type of unit
1
Child
540H DIP switch settings for Easy-Link System
Lower bank of DIP switches
PARENT
board.
No. 1 ON
CHILD unit 540H
Connectors
Lower bank of
DIP switches
Page
Installation Manual
Installation
Unit # of easy-link
2, 3, or 4
Connection
CHILD
with 710
No. 1 OFF
No. 6 ON
CHILD unit 540H
Connectors
Lower bank of
DIP switches
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