Connecting Multiple MSB-M Units
U306-1032(00)
070 00012 32069 4
1) On the master MSB, one connector
is connected to the terminal connector
and the other one is connected to the
MSB Communication cable.
Manifold Electronic Control System
Installation Instructions
MSB-C2
Master MSB board
2) When 2 MSB boards are used a
MSB Communication cable will be
installed between the master MSB
board and the second MSB. The open
connector will have the Terminal
connector installed on both MSB
boards.
Note:
Up to 5 water heaters can be connected together using
the MSB-M and MSB-C1 kits.
When over 5 water heaters are connected together,
•
2nd MSB board
•
MSB-M units are connected using MSB-C2 kits.
If multiple MSB-M are used, then at least three water heaters
should be connected to each MSB-M.
A maximum of 5 MSB boards can
be connected to each other.
The terminal connector is
•
connected on the terminal MSB
which has an open connector.
Ex: With 7 water heaters, one MSB-M should control 4 water
heaters and the other MSB-M should control 3 water heaters.
United States & Canada: For use with Rinnai Tankless Water
Heaters (except for models V53e, V53i and R63LSe which must
use pressure activation valves, PVA).
Please contact Rinnai if you have further questions on the
applicable water heater models.
•
•
2nd to 4th MSB board
WARNING
Disconnect all water heaters from their power source before carrying out
the following installation procedures.
5th MSB board (Terminal MSB)
NOTE: The front cover panels of each water heater must be removed prior
to completing the following installation procedures.
NOTE:
When viewing the installed MSB board, the dip switch will be as
shown below (upside down).
3) Set No 3 switch on the master MSB
to ON. The LED light 6 should turn ON
confirming the connection.
Kit Components
MSB-C2 (Pack C)
4) Set No 4 switch on the second MSB
to ON. The LED light 6 should turn ON
confirming the connection.
(For wiring MSB units)
Parts List
Part
Qty
1
MSB Communication cable
(13.1 ft, 4 m)
5) Set No 3 and No 4 switches on the
third MSB board to ON.
The LED light 6 should turn ON
confirming the connection.
Terminal connector
Instruction Sheet
2
1
Communication Cable A
Master
2nd
6) Set the No 5 switch on the fourth
MSB board to ON.
The LED light 6 should turn ON
confirming the connection.
Water Heater
Control
3rd
4th
Communication Cables B
Control Board
7) Set No 3 and No 5 switches on the
on the fifth MSB board to ON.
The LED light 6 should turn ON
confirming the connection.
MSB Communication cable (MSB-C2)
5th
Indicator light (LED 6) on the Control Board indicates the status as
follows:
Communication cable connectors
LED 6
EXPLANATION
LED6
Working with multiple MSB boards
Stand alone
Solid
Off
LED 1 ~ 5
(See MSB-C1 instruction)
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