State 520 - Manual (Page 27)

Installation
27 │
Page
 The Easy‐Link system is limited 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 water heater cannot be linked with other different tankless models in an
Easy‐Link system.
EASY‐LINK SYSTEM
Available on the 520 (T‐H2) models only
‐General‐
The water heater can be connected with other heaters of the same model 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 unit.
You can manifold from 2 to 4 units without the need for a multi‐system controller. A 4‐unit
system has full automatic modulation between 13,000 BTU/h and 796,000 BTU/h.
‐Easy‐Link Connection Procedures‐
1. Verify the set temperatures of all units within the system. Every single water heater must be set
to the same set temperature.
2. Select one unit to be the “PARENT” unit.
3. “PARENT” unit
Locate the two banks of dipswitches to the left of the 3‐digit 7‐seg. LED on the computer board of
the unit that you select to be the “PARENT” unit. Change dipswitch No. 10 on the right bank of
dipswitches to the ON position. Do not change any dipswitches on any of the “CHILD” units.
Hot Out
Cold In
Gas In
CAUTION