Installation Guide

ManualsBrandsRinnai Tankless ManualsAccessoriesRinnai Multi Unit Tankless Water Heater Manifold Electronic Control Kit

Rinnai New Zealand Limited

0800 746 624

2011 MECS: MSB-C1, C2 and C3

01-11

Manifold Electronic Control System (MECS)

Innity units can be manifolded together (up to 25) by connecting them in parallel to enable

a greater hot water ow rate than is possible with a single unit. MECS is a totally integrated

system unique to Rinnai that links each Innity unit in the system and will turn on each unit as

required.

The system is designed to ensure gas is not wasted and that an endless supply of hot water is

always available.

How it works

A master and sub-communication PCB is installed in the rst unit and other subsequent units

have only the sub-communication PCB (slave cable) installed. The master communication PCB

receives information about ow rates from the PCB of each unit and balances the load on each

unit. Random selection of the units required to supply the ow demand means that all units

share the workload evenly.

All information is transmitted via communication cables to the slave units. The master control

also had an inbuilt fault detection system and will allocate a replacement unit should one fail.

MSB-C1, C2 and C3

This MECS system has the capability of joining up to 25 Innity units and will replace the

previous Rinnai REU-SA2M/2S and REU-SA3M/3S MECS systems.

Description

Part number Instruction book Description

REU-MSBM MSB-C1 MESC master board for internal mounting inside Innity to connect ve

units

REU-MSBMB MSB-C1 MECS master board for external mounting to connect ve units

REU-MSBC1 MSB-C1 Slave cable to connect one additional unit

REU-MSBC2 MSB-C2 Joiner cable to daisy chain two MECS master boards together (up to a

maximum of ve boards can be connected)

REU-MSBC3 MSB-C3 Slave cable as a spare part for the older REU-MSA2S MECS system

MECS

MSB-C1, MSB-C2,

MSB-C3

Summary of content (7 pages)

PAGE 1
MECS MSB-C1, MSB-C2, MSB-C3 Manifold Electronic Control System (MECS) Infinity units can be manifolded together (up to 25) by connecting them in parallel to enable a greater hot water flow rate than is possible with a single unit. MECS is a totally integrated system unique to Rinnai that links each Infinity unit in the system and will turn on each unit as required. The system is designed to ensure gas is not wasted and that an endless supply of hot water is always available.
PAGE 2
MSB-C1, MSB-C2, MSB-C3 MECS What to use where Older MECS system New installs substitute Replacement spare part REU-MSA2M REU-MSBM REUMSBM REU-MSA2S REU-MSBC1 REUMSBC3 REU-MSA3M REU-MSBMB REUMSBMB REU-MSA3S REU-SBC1 REUMSBC1 Decription Master Location Inside Infinity Part number REU-MSBM 1 Slave Joiner REU-MSBC1 REU-MSBC2 External box 2 REU-MSBMB No.
PAGE 3
MECS MSB-C1, MSB-C2, MSB-C3 Infinity model compatibility Current model Previous model HD200 REU-VRM2632WC - HD200i REU-VR2632FFU REU-VM2632FFUG HD250 REU-VR3237WC REU-VM3237WC HD250i REU-VM3237FFUC XR26i REU-V2632FFUG XR32 REU-V3237WG HD250E REU-K3237WC HD250Ei REU-3237FFUC 2 Can be used for all above models, and MUST be used for all HD200 (REU-VM2630WC), XR & VT domestic models3 and Efficiency24 (REU-K2430) 3 Reduced warranty applies to domestic models used in commercial applicati
PAGE 4
U306-1030(00) For Unit 1: 070 00012 32035 9 Manifold Electronic Control System Installation Instructions MSB-M MSB-C1 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. If installing on a condensing water heater, refer to the additional instruction showing below. * Note: • Up to 5 water heaters can be connected together using the MSB-M and MSB-C1 kits.
PAGE 5
System Operation For Units 2, 3, 4, and 5: 5) Run the 4-pin connector of Communication Cable B (9.8 ft, 3 m cable) up through the cable access in the bottom of Unit 1’s cabinet. 6) Connect the connector of the Communication Cable B to socket 2 on the Control Board. The Communication Cable B ground wire terminals should be grounded with the MSB ground wire and Communication Cable A ground wire terminal.
PAGE 6
Connecting Multiple MSB-M Units U306-1032(00) Manifold Electronic Control System Installation Instructions 1) On the master MSB, one connector is connected to the terminal connector and the other one is connected to the MSB Communication cable. MSB-C2 Master MSB board Note: x Up to 5 water heaters can be connected together using the MSB-M and MSB-C1 kits. x When over 5 water heaters are connected together, MSB-M units are connected using MSB-C2 kits.
PAGE 7
U306-1034(00) For Unit 1: 070 00012 32077 9 Manifold Electronic Control System Installation Instructions MSB-C3 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 to socket No. 1 on Control Board. Note: • Up to 5 water heaters can be connected together using the MSB-M and MSB-C3 kits.