John Wood Takagi - 910 - Manual (Page 15)

15
D) No. 4 and No. 5 OFF: Normal Control (Default
setting)
This provides no ON/OFF control for the pump. If a pump
is connected to the pump control terminal and both No. 4
and No. 5 are OFF, the pump will be made to run all the
time as long as there is a power supply to the 910 (If the
temperature remote controller is installed, the pump will stop
when the remote is turned off). Water in the loop will be
maintained at set temperature.
Pump Control Modes
A) Recirculation Control
ON
8 7 6 5 4 3 2 1
B) Storage Tank Circulation
Control
ON
8 7 6 5 4 3 2 1
C) Energy Conserving
ON
8 7 6 5 4 3 2 1
D) Normal Control Recirculation
(Default) ON
8 7 6 5 4 3 2 1
The dark squares indicate the direction the DIPswitches
should be set to.
Easy-link System
The 910 can be connected with other heaters of the same
model with communication cables to work as a multiple
manifold system.
The Easy-Link system can connect up to 4 units.
A communication cable (gray color) comes with each
unit. The cables use 18 gage wire and can be up to
76.2m (250 ft.) long all together.
You can manifold from 2 units to 4 units without a multi-sys-
tem controller. A 4-unit system has full automatic modulation
between 15,000 BTU/h and 1,520,000 BTU/h.
Gas
In
Cold
In
Hot
Out
CAUTION
The Easy-Link system is limited to 4
units. If you connect more than 4 units,
the first 4 units will work as part of the
Easy-Link system, but the other addi-
tional units will only work as individual
units.
The 910 cannot be linked with other dif-
ferent tankless models in the Easy-Link
system and Multi-Unit system. •
•
•
•
General
To change the DIPswitch settings for the Easy-Link system,
locate the lower bank of DIPswitches to the right of the 7-
seg LED. Do not adjust the upper bank of DIPswitches.
Easy-Link / Multi-unit
System connectors are on
each unit’s computer board
Upper bank of DIPswitches
7-Seg LED Lower bank of
DIPswitches This lamp will fl ash when the
unit is allowed the operation.
Easy-Link Connection Procedures
Choose one of your units as the “PARENT” unit.
“PARENT” unit. Locate the lower bank of DIPswitches
to the right of the 7-seg. LED on the central computer
board of the 910 that you select to be the “PARENT” unit.
Change DIPswitch No. 8 to “ON”. Do not change any of
the DIPswitches on 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.
The numbering system of the 910 automatically allocates
the unit # to each water heater that is part of the Easy-
Link system.
Communication
cable
Connectors
Lower bank of
DIPswitches
OFF
ON
1 2 3 4 5 6 7 8
PARENT
2
1
Connectors
Lower bank of
DIPswitches
OFF
ON
1 2 3 4 5 6 7 8
PARENT
2
1
Connectors
Lower bank of
DIPswitches
OFF
ON
1 2 3 4 5 6 7 8
PARENT
2
1
Connectors
Lower bank of
DIPswitches
OFF
ON
1 2 3 4 5 6 7 8
PARENT
2
1
PARENT
unit
CHILD-1
unit
CHILD-2
unit
CHILD-3
unit
PARENT unit Unit # : 1
CHILD units Unit# : 2, 3 and 4
The dark squares indicate the direction the dipswitches
should be set to.
1.
2.
3.
4.
5.
6.