Kit Components

U306-1032(00)

070 00012 32069 4

Manifold Electronic Control System

Installation Instructions

MSB-C2

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.

MSB-C2 (Pack C)
(For wiring MSB units)
Parts List
Part	Qty
MSB Communication cable	1
(13.1 ft, 4 m)
Terminal connector	2
Instruction Sheet	1
Master	Communication Cable A
Master
2nd
3rd		Water Heater
3rd		Control
		Control
	Communication Cables B	Control Board
		Control Board
4th
	MSB Communication cable (MSB-C2)
5th

Communication cable connectors

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.

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.

2nd MSB board

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.

2nd to 4th MSB board

5th MSB board (Terminal MSB)

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	EXPLANATION
	EXPLANATION

Solid	Working with multiple MSB boards
Off	Stand alone

MSB-C2 specifications

The Rinnai MSB-C2 is a cutting-edge gas boiler that exemplifies the brand’s commitment to efficiency, reliability, and advanced technology. Designed for both residential and commercial applications, this model is recognized for its compact size, making it an ideal choice for spaces where installation space is limited.

One of the standout features of the Rinnai MSB-C2 is its exceptional energy efficiency. It boasts a high thermal efficiency rating, which significantly reduces energy consumption and utility costs. This is particularly important in the current climate of rising energy prices, making the MSB-C2 an economically savvy choice for users looking to reduce expenses without sacrificing comfort.

The boiler utilizes a modulating burner system that adjusts the burner output according to the heating demand. This means that the unit operates at varying levels of power, delivering precisely the amount of heat needed at any given time. This feature not only enhances the comfort of the space it serves but also contributes to improved fuel efficiency.

Incorporating advanced condensing technology, the Rinnai MSB-C2 maximizes heat extraction from the combustion process. The condensate produced during this process is captured and reused, further enhancing the system’s overall efficiency. This eco-friendly aspect is a significant advantage for environmentally conscious consumers and businesses.

Ease of installation is another hallmark of the MSB-C2. Its lightweight design and compact dimensions facilitate installation in various settings, including tight spaces or retrofits where traditional boilers might not fit. Additionally, the unit is designed with user-friendly controls that simplify operation and maintenance, making it accessible to a broad range of users.

Safety features are paramount in the design of the Rinnai MSB-C2. It includes multiple sensors that monitor the system’s performance, ensuring reliable operation while preventing potential hazards. The boiler’s materials are engineered to withstand the rigors of long-term use, promising durability and longevity.

Overall, the Rinnai MSB-C2 represents a significant advancement in gas boiler technology. With its efficient performance, advanced features, and user-centric design, it stands out as an excellent choice for those seeking a reliable heating solution that combines modern technology with practicality. Whether in a home or a commercial setting, the MSB-C2 delivers comfort and peace of mind.