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U306-1032(00)
Manifold Electronic Control System
Installation Instructions
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,
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.
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.
WARNING
Disconnect all water heaters from their power source before carrying out
the following installation procedures.
NOTE: The front cover panels of each water heater must be removed prior
to completing the following installation procedures.
Kit Components
MSB-C2 (Pack C)
(For wiring MSB units)
Parts List
Part
MSB Communication cable
(13.1 ft, 4 m)
Terminal connector
Instruction Sheet
Master
2nd
3rd
4th
5th
Communication cable connectors
MSB-C2
Qty
1
2
1
Communication Cable A
Water Heater
Control
Communication Cables B
Control Board
MSB Communication cable (MSB-C2)
LED6
LED 1 ~ 5
(See MSB-C1 instruction)
Connecting Multiple MSB-M Units
1) On the master MSB, one connector
is connected to the terminal connector
and the other one is connected to the
MSB Communication cable.
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.
A maximum of 5 MSB boards can
be connected to each other.
The terminal connection is
connected on the terminal MSB
which has an open connector.
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.
4) Set No 4 switch on the second MSB
to ON. The LED light 6 should turn ON
confirming the connection.
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.
6) Set the No 5 switch on the fourth
MSB board to ON.
The LED light 6 should turn ON
confirming the connection.
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.
Indicator light (LED 6) on the Control Board indicates the status as
follows:
LED 6
Working with multiple MSB boards
Solid
Off
Master MSB board
2nd MSB board
2nd to 4th MSB board
5th MSB board (Terminal MSB)
EXPLANATION
Stand alone
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