Rinnai Comprehensive Guide for Temperature Controller Installation, Wiring, and Controller Cable Setup

Temperature Controller Installation

Mounting the Controller

Follow the procedure below to install MC-91 or MCC-91 temperature controllers.

1.	Determine a suitable location for the
	controller.
2.	Make three holes in the wall as shown.
3.	Run the cable between the controller and the
	Rinnai water heater or the controller and the
	other controller.
4.	Remove the face plate from the temperature
	controller using a screwdriver.
5.	Connect the cable to the temperature
	controller.
6.	Mount the controller to the wall using the
	holes drilled in step 2.
7.	Disconnect the power from the Rinnai water
	heater.

Outline of Remote

8.	Remove the cover of the Rinnai water heater.
9.	Remove the plastic cover from the PCB and
	electrical connections.
10.	Thread the cable through the access hole at
	the base of the unit and connect the wires to
	the controller terminals on the right hand side
	bottom of the PCB.
11.	Secure the controller cable using the clamp
	provided.
12.	Replace plastic cover over PCB and then
	replace the cover of the Rinnai water heater.

securing screw

wiring hole

securing screw

1-21/32"

3-5/16"

VB Series Indoor LS Manual 37