7 ModBus
Indirect Plate Water Heater Installation & Service Manual
Installation Procedure
1. Turn OFF the main electrical power to the appliance.
2. Open the control box door by loosening the screws
clamping the door closed.
3. Connect wires to the control following the diagram in
Figure 7-1.
4. Close the control box door.
5. Turn on the main electrical power.
7. Configure the control per this manual and resume
operation.
Figure 7-1_Harness Connections
A
B
SHIELD
1A
1B
1C
1D
2A
2D
2C
2B
3A
3B
3C
3D
IO Module 3
IO Module 2
IO Module 1
Comms Channel 2
Comms Channel 1
HA
HB
HC
HD
HF
HE
JA
JB
JC
JD
JE
JF
L
V-
V+
VI
AC
AB
AA
N
D8
LB
LC
21
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