Installation Guide

37 Page
EASY-LINK SYSTEM
(540 model only)
The 540 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 540 model.
You can manifold from 2 to 4 units without the need for a multi-unit controller. A 4-unit system has full automatic
modulation between 13,000 BTU/h (Propane) or 15,000 BTU/h (Natural gas) to 796,000 BTU/h.
-Easy-Link connecon procedures-
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.
Installaon
Installaon Manual
Approved heaters that can be combined with 540 model
in an Easy-Link System
710 model /710 ASME
520 model
540 model
540P model (Only when 540P is a PARENT unit in the system. )
Hot Out
Gas In
Cold In

for the Easy-Link System between the 710
and 540, cut out the connectors for the
Easy-Link System and then splice the wires

and 540 in the Easy-Link System.
Easy-Link connectors
Wire
cutters
 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.
 The 540 model cannot be combined together with other models not listed on the
table above.
 A 540P model only can be connected to 540 models where the 540P is the PARENT
unit in the system.
 When a 540 model is connected to other models listed above in an Easy-Link System,
contact the manufacturer.
 When a 710 and 540 are connected together in an Easy-Link System, change DIP
switch No.6 on the lower bank of DIP switches on the 540 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 auto-
matically 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.
NOTICE