Rinnai Water Heater MSB C1 User Guide

U306-1030(00)  
070 00012 32035 9  
For Unit 1:  
1) Remove the screw from the  
sheet metal reinforcement plate  
located at the bottom of the  
water heater cabinet, and then  
use it to secure the Control Board  
to the water heater cabinet.  
Manifold Electronic Control System  
Installation Instructions  
MSB-M  
MSB-C1  
If installing on a condensing  
water heater, refer to the addi-  
tional instruction showing  
below. *  
2) Connect the connector  
from Communication Cable A (18  
inch, 450 mm cable) to socket No. 1  
on Control Board.  
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.  
Ground wire of  
Communication Cable A  
WARNING  
3) Connect the connector from  
Communication Cable A to the  
4-pin socket located at the top of  
the water heater control board.  
Communication Cable A  
ground wire terminal should be  
grounded with the PC board  
ground wire.  
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  
Ground wire of  
Communication Cable A  
MSB-M (Pack A)  
MSB-C1 (Pack B)  
(For wiring Units 3, 4 and 5)  
(For wiring Units 1 and 2)  
Parts List  
Parts List  
Part  
Qty  
Part  
Qty  
1
Communication Cable B  
(9.8 ft, 3 m)  
Cable tie bracket  
Cable tie  
Control Board  
Communication Cable A  
(18 in, 450 mm)  
Communication Cable B  
(9.8 ft, 3 m)  
1
1
4) Attach the cable tie bracket to  
the bottom of the water heater  
cabinet using the existing screw.  
Loosely secure the cable tie  
through the bracket and around  
the communication cable. DO NOT  
TIGHTEN THE CABLE TIE AT THIS  
TIME - the Communication Cables B  
from the other water heaters must  
be secured by this cable tie.  
2
2
1
1
Instruction Sheet  
Cable tie bracket  
Cable tie  
Instruction Sheet  
bracket  
2
2
1
1
2
Note: One MSB-C1 is required  
for each water heater (Units 3, 4,  
and 5)  
Screw  
* These condensing water heaters require a bracket for the  
control board:  
RC98HPi (REU-KA3237FFUD)/RC98HPe (REU-KA3237WD)  
/RC80HPi (REU-KA2530FFUD)/RC80HPe (REU-KA2530WD)  
/REU-KM3237FFUD/REU-KM3237WD/ REU-KM2635FFUD  
/REU-KM2635WD  
Attach the control board to this bracket with one screw in Step 1.  
Communication Cable A  
Master  
2nd  
Water Heater  
Control  
3rd  
4th  
Communication Cables B  
Control Board  
Install the bracket  
Attach the control board  
MSB Communication cable (MSB-C2)  
Install the bracket with one screw as shown above and  
continue with the rest of the installation.  
5th  
On the 2nd to 5th MSB boards, set to 1 unit ready.  
 

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