Rinnai Water Heater MSB C2 User Guide

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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