User Guide

- 12 -
B5B5
9090
No.2
System Controller
Fix with accessory screw
Ground Wire
Connect with
accessory screw
Connector color: red
Connector color: red
Slide system controller
into the bracket in the
back of the case.
"To remote controller terminal " tag
* Remote Controller cord
(To remote controller)
Remote Controller Cord
Connect to the connector No.90 of the unit.
Connect to the connector
B5 of the unit.
PCB
Clamp
"To Gas Water Heater for Multi " tag
"SYSTEM CONTROLLER" tag
" Disconnect for system controller " tag
Disconnect this connector
on units 2-6 also.
Disconnect this Connector
Except (L)WHC56, BC3200RA
N-0931M(-DV, -OD)(-ASME), NC250-SV(-DV)-ASME
N-0841MC(-DV), NCC199-SV(-DV), N-0842MC(-DV), (L)WHC56, BC3200RA
The remote controller cord length*
When using one remote controller = Maximum length 100m (300ft.).
When using two remote controllers = within 50m (150ft.) each (BC3200RA only).
When using three remote controllers = within 20m (65ft.) each (BC3200RA only).
Please refer to the installation manual of the unit about version and quantity of remote controllers *
that can be connected.
Unit 1
(The Unit with the System Controller)
Units 2-6
(Connect each unit to corresponding wires labeled 2-6 from the system controller)
Clamp
Remote Controller Cord
No.2 To Unit 2
No.6 To Unit 6
When installing the system controller, take care not to damage the internal electrical components (1)
in the unit and tie off loose electrical cords with the included vinyl ties.**
Remove the connector from the circuit board to the remote controller terminal block in the unit.(2)
Connect this disconnected connector labeled 90 from the circuit board to the connector labeled 90
from the system controller.
Connect the connector from the remote controller terminal block to the connector from the system (3)
controller labeled "To remote controller terminal ".
Connect the B5 connector from the system controller to the B5 connector of the unit.(4)
Use the remote controller cords and the cords included with the system controller to connect the (5)
other units to the system controller.
The location of the terminals will either be inside the unit or external to the unit.*
**Note: If remote controller RC-7647M or RC-7650M ( °C temperature display) is being used, an
adjustment to all water heaters connected to the system controller will be necessary.
Make this adjustment prior to making the electrical connections to the system controller.
Refer to page 14 for instructions.
When installing 2 or more units
Install one remote controller cord for every unit connected to the system controller. Wire each unit
independently to the system controller keeping the overall length of the remote controller cord less
than 15m(45 ft.).