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The 540H model water heaters can combine with the following approved heaters with communication
cables to work as a multiple-unit manifold system.
• The built-in Easy-Link System allows up to 4 units to manifold together.
• A communication cable (gray color) comes with each 540H model.
You can manifold from 2 to 4 units without the need for a multi-unit controller. A 4-unit system has full auto-
matic modulation between 13,000 BTU/h (Propane) or 15,000 BTU/h (Natural gas) to 796,000 BTU/h.
Approved heaters that can be combined with 540H model
in an Easy-Link System
710 model /710 ASME
540H model, CT-199 model
540P model (Only when 540P is a PARENT unit in the system. )
Gas In
Cold In
• The Easy-Link System is limited to up to 4 units. If you connect more than 4 units, only the first
4 units will work as a part of the Easy-Link System. The other additional units will not work.
NOTICE
• The 540H model cannot be combined together with other models not listed on the table above.
• A 540P model only can be connected to 540H models where the 540P is the PARENT unit in
the system.
• When a 540H model is connected to other models listed above in an Easy-Link System,
contact the manufacturer.
• When a 710 and 540H are connected together in an Easy-Link System, change DIP switch
No.6 on the lower bank of DIP switches on the 540H model computer board to the "ON"
position. (See the following page for detail.)
• A remote controller is not required for an Easy-Link System. However, it does provide for
more temperature options and ease of maintenance.
• If a remote controller is used, the temperature on all the units in the system will automatical-
ly be set to the same temperature that is set on the remote.
• When a remote is used in an Easy-Link System, it must be connected to the parent unit.
• Only one remote can be connected.
1. Make sure the power to the heaters are off.
2. Verify the DIP switch set temperatures of all units within the system. Every single water heater must be set
to the same set temperature. If a remote controller is used, it should be installed to the "PARENT" unit.
The controller will set the temperature for the entire system. NOTICE: Only a remote approved for use with
the "PARENT" model may be installed.
3. Select one unit to be the "PARENT" unit. The "PARENT" unit should be one of the end units.
4. "PARENT" unit:
Locate the two banks of DIP switches at the bottom left of the computer board of the unit that you select
to be the "PARENT" unit. Change DIP switch No. 1 on the lower bank of DIP switches to the ON position.
Refer to the following page. Do not change any DIP switches on any of the "CHILD" units.
EASY-LINK SYSTEM
(540H model only)
520 model
Hot Out
-Easy-Link connection procedures-
38
Due to the difference in the connector type
for the Easy-Link System between the 710
and 540H, cut out the connectors for the
Easy-Link System and then splice the wires
directly together when connecting the 710
and 540H in the Easy-Link System.
Page
Installation Manual
Installation
Wire
cutters
Easy-Link connectors
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