State 520 - Manual (Page 28)

Installation
28 │
Page
The dark squares indicate the direction
the dipswitches should be set to.
4. 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.
5. 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.
6. Between the “CHILD‐2” and the “CHILD‐3” units
Connect the “[2] connector” of the “CHILD‐2” unit to the “[1] connector” of the “CHILD‐3” unit.
7. Make sure the “3‐digit 7‐seg. LED” of all the units’ computer boards display the unit #. The
numbering system 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) 520 (T‐H2) Computer board
(B) Basic diagram of connections among the 520 (T‐H2) models.
Right bank of
dipswitches
Left bank of
dipswitches
When setting a unit to a
“PARENT” unit, adjust
dipswitch No.10 on the
right bank of
dipswitches only
(see diagram).
Easy‐Link connectors
are next to the
computer board.
3 digit 7‐Seg. LED
CHILD‐3 unit
PARENT unit CHILD‐1 unit CHILD‐2 unit
C o n n e c t o r s
P
A R
E
N T
2
1
2 1
C o m m u n i c a t i o n c a b l e
C o n n e c t o r s
P
A R
E
N T
2
1
2 1
O F
F
O N
1
2
3
4
5
6
7
8
Ri g ht ba nk
of Di p sw it c he s
O F
F
O N
9
1
0
C o n n e c t o r s
P
A R
E
N T
2
1
2 1
C o n n e c t o r s
P
A
R
E
N
T
2
1
2 1
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
9
1
0
O F
F
O N
1
2
3
4
5
6
7
8
R i gh t b a n k
o f D ip s w i tc h es
O F
F
O N
9
1
0
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
9
1
0
O F
F
O N
1
2
3
4
5
6
7
8
R ig ht ba nk
o f Di p sw it c he s
O F
F
O N
9
1
0
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
9
1
0
O F F
O N
1
2
3
4
5
6
7
8
R ig h t ba n k
o f D ip sw i tc he s
O F F
O N
9
1
0
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
9
1
0