John Wood Takagi - 320H-520H - Manual (Page 21)

21
Make sure the “3-digit 7-seg. LED" of all the units’ com-
puter boards display the unit #. The numbering system of
the 520H automatically allocates the unit # to each water
heater in the Easy- Link system, in accordance with the
table below.
Parent unit Unit #: 1
Child units Unit #: 2, 3 and 4
(A) 520H Computer board
Left bank of
DIPswitches
3 digit 7-
Seg. LED
Right bank of
DIPswitches
Easy-Link connectors
are next to the
computer board.
When setting a unit to a “PARENT" unit, adjust DIPswitch
No.10 on the right bank of DIPswitches only (see diagram).
(B) Basic diagram of connections among the 520H models.
PARENT unit
Connectors
PARENT
2
1
Right bank
of Dipswitches
OFF ON
1
2
3
4
5
678
9
10
1
2
3
456789
10
Connectors
PARENT
2
1
Right bank
of Dipswitches
OFF ON
1
2
3
4
5
678
9
10
1
234567
8
9
10
Connectors
PARENT
2
1
Right bank
of Dipswitches
OFF ON
1
2
3
4
5
678
9
10
1
234567
8
9
10
Communication cable
Connectors
PARENT
2
1
Right bank
of Dipswitches
OFF ON
1
2
3
4
5
678
9
10
1
2
345
6
7
8
9
10
PARENT unit CHILD-1 unit CHILD-2 unit
CHILD-3 unit The dark squares indicate the direction
the DIPswitches should be set to.
7. (C) Examples of incorrect settings and/or connections
CASE 1:
Unless you change DIPswitch No.10 of the “PARENT"
unit to the “ON" position, the system will not work as an
Easy-Link system. The units will operate as individual
units.
Connectors
PARENT
2
1
Right bank
of Dipswitches
OFF ON
1
2
3
4
5
678
9
10
1
23456789
10
Communication cable
Connectors
PARENT
2
1
Right bank
of Dipswitches
OFF ON
1
2
3
4
5
678
9
10
1
2
3
45
6
7
8
9
10
PARENT unit CHILD-1 unit
Prohibited
Wrong DIPswitch setting on the “PARENT"
unit
CASE 2:
If you connect the “[1] (or [2])" connector of the “PARENT"
unit to the “PARENT (or [1])" connector of the “CHILD-1"
unit, the system will not work as an Easy-link system.
The units will operate as individual units.
Connectors
PARENT
2
1
Right bank
of Dipswitches
OFF ON
1
2
3
4
5
678
9
10
1
23456789
10
Communication cable
Connectors
PARENT
2
1
Right bank
of Dipswitches
OFF ON
1
2
3
4
5
678
9
10
1
2
3
45
6
7
8
9
10
PARENT unit CHILD-1 unit
OR
Connectors
PARENT
2
1
Right bank
of Dipswitches
OFF ON
1
2
3
4
5
678
9
10
1
23456789
10
Communication cable
Connectors
PARENT
2
1
Right bank
of Dipswitches
OFF ON
1
2
3
4
5
678
9
10
1
2
3
45
6
7
8
9
10
PARENT unit CHILD-1 unit
Prohibited
Wrong connections between the “PARENT"
unit and the “CHILD-1" unit
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