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EASY-LINK SYSTEM
Available on the 510U (AT-D3U-IN/OS) model only
The 510U (AT-D3U-IN/OS) model water heaters can be connected with other allowable heaters
(see the table below) with communication cables to work as a multiple-unit manifold system.
The Easy-Link System allows up to 4 units to manifold together.
A communication cable (gray color) comes with each 510U (AT-D3U-IN/OS) 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 15,000 BTU/h and 796,000 BTU/h.
-Easy-Link Connecon Procedures-
1. Make sure the power to the heaters is turned off.
2. Verify the DIP switch set temperatures of all units within the system. Every water heater must be set
to the same set temperature. If an optional remote controller (9009069005/TM-RE42) is used, it
should be installed to the “PARENT” unit. (See section B on the naxt page.) The remote will set the
temperature for the entire system.
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. See the computer board diagram as shown on the next page. Do not change any DIP
switches on any of the “CHILD” units.
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.
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 as part of the system.
Only listed models on the table above can be combined together as an
Easy-Link System. These models cannot be combined together with other
models not listed on the table above.
CAUTION
-General-
Installaon
Installaon Manual
ON
1
2
3
4
5
6
2
3
4
5
The dark square indicates the correct DIP switch position.
DIP switch setting on the 510U (AT-D2U-IN/OS) and 510U (AT-D3U-IN/OS)
(Lower bank of DIP switches)
Easy-Link connection
with allowable heaters
510 model (AT-D2-IN/OS)
510U model (AT-D2U-IN/OS)*
510U model (AT-D3U-IN/OS)*
200 series
*If the 510U (AT-D2U-IN/OS) models and the 510U (AT-D3U-IN/OS) models are incorporated in an Easy-
Link Sytem with the other models in the table above, change DIP switch No. 6 on the lower bank of all
the 510U (AT-D2U-IN/OS) and 510U (AT-D3U-IN/OS) computer boards to the “ON” position.
Gas In
Hot Out
Cold In
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