John Wood Takagi - 320H-520H - Manual (Page 20)

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C) Energy Conserving Recirculation: No.5 and
No.6 ON
Feature: Operates similarly to the standard Recirculation
Control mode, but saves more energy by limiting
the temperature within the recirculation loop.
Function: The temperature of the recirculation loop is never
kept above 49 °C (120°F), regardless of the set
temperature of the water heater.
D) Normal Control (Default setting): No.5 and
No.6 OFF
Feature: This mode provides no special pump control.
Pump activation can only be turned ON or OFF
by the remote controller.
Function: The pump will run continually all the time as long
as there is a power supply to the water heater.
The pump will only stop when the remote is
turned off. Water in the loop will be maintained at
the set temperature of the water heater.
Dipswitch settings for the Pump control modes (ight bank of
DIPswitches).
Pump
mode
A)
Re-
circulation
Control
B)
Storage
Tank
Circulation
Control
C)
Energy
Conserving
Re-
circulation
D)
Normal
Control
(Default)
Switch
No.5
ON OFF ON OFF
Switch
No.6
OFF ON ON OFF
10
9
8
7
6
5
4
3
2
1
ON
10
9
8
7
6
5
4
3
2
1
ON
10
9
8
7
6
5
4
3
2
1
ON
10
9
8
7
6
5
4
3
2
1
ON
The dark squares indicate the direction the DIPswitch
should be set to.
Easy-link System
General
The 520H 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 auto-
matic modulation between 13,000 BTU/h and 796,000
BTU/h.
Gas In
Cold In
Hot Out
CAUTION
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 addi-
tional units will not work.
The 520H cannot be linked with other
different tankless models in an Easy-
Link system. •
•
Easy-Link Connection Procedures
Verify the set temperatures of all units within the system.
Every single water heater must be set to the same set
temperature.
Select one unit to be the “PARENT" unit.
“PARENT" unit. Locate the two banks of DIPswitches
to the left of the 3-digit 7-seg. LED on the computer
board of the 520H 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.
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.
Between the “CHILD-1" and the “CHILD-2" units. Connect
the “[2] connector" of the “CHILD-1" unit to the “[1] con-
nector" of the “CHILD-2" unit.
Between the “CHILD-2" and the “CHILD-3" units. Connect
the “[2] connector" of the “CHILD-2" unit to the “[1] con-
nector" of the “CHILD-3" unit.
•
•
•
1.
2.
3.
4.
5.
6.