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Kit Components

MSB-M (Pack A)

(For wiring Units 1 and 2) 

Parts List

Part

               Qty 

Control Board
Communication Cable A  

Communication Cable B  

Cable tie bracket

                 2

Cable tie

               2

Instruction Sheet

                 1

MSB-C1 (Pack B)

(For wiring Units 3, 4 and 5) 

Parts List

Part

               Qty 

Communication Cable B  

Cable tie bracket

                 2 

Cable tie

               2 

Instruction Sheet

                 1 

Note: One MSB-C1 is required 
for each water heater (Units 3, 4,  

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.

2) Connect the  connector 
from Communication Cable A (18 
inch, 450 mm cable) to socket No. 1
on Control Board.  

1

1
1

1

and 5)

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.

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. 

Communication Cables B

Water Heater 
Control 

Communication Cable A

Control Board

MSB Communication cable (MSB-C2)

bracket

                 1

If installing on a condensing 
water heater, refer to the addi-
tional instruction showing 
below. *

(18 in,  450 mm)

(9.8 ft,  3 m)

(9.8 ft,  3 m)

Screw

                 2

U306-1030(00)

Manifold Electronic Control System

Installation Instructions 

MSB-M

MSB-C1

Note:

• 

Up to 5 water heaters can be connected together using 

the MSB-M and MSB-C1 kits. 

United States & Canada:  For use with Rinnai Tankless Water 
Heaters (except for models V53e, V53i and R63LSe which must 
use pressure activation valves, PVA).  

• 

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.

WARNING

Please contact Rinnai if you have further questions on the 
applicable water heater models.   

• 

• 

When over 5 water heaters are connected together,

MSB-M units are connected using MSB-C2 kits. 

• 

Master

2nd

3rd

4th

5th

070 00012 32035 9

* 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

Install the bracket with one screw as shown above and 
continue with the rest of the installation.

Install the bracket 

Attach the control board

Attach the control board to this bracket with one screw in Step 1. 

Ground wire of
Communication Cable A 

Ground wire of
Communication Cable A 

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. 

On the 2nd to 5th MSB boards, set to 1 unit ready.

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