Rinnai SE Series Installation Manual page 48

MSB Installation
1. On the master MSB, one connector is connected to
the terminal connector and the other one is connect-
ed to the MSB Communication cable.
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.
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.
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.
Master MSB board
2nd MSB board
2nd to 4th
MSB board
5th or Terminal
MSB board
48 Rinnai Rack Installation