Installation Of Temperature Controller - Rinnai RL75i Installation And Operation Manual

Installation of Temperature Controller

WARNING
Turn the power off. Do not attempt to connect the
temperature controllers with the power on. Although
the controller is a low voltage device, there is 120 volt
potential next to the temperature controller
connections inside the unit.
Do not connect the temperature controller to the
120VAC terminals provided for the optional solenoid
drain valves.
Indoor models have their controller built into the
front panel. Additional controllers can be installed.
Controller Location

The controller should be out of reach of small
children.

Avoid locations where the controller may become
hot (near the oven or radiant heater).

Avoid locations in direct sunlight. The digital
display may be difficult to read in direct sunlight.

Avoid locations where the temperature controller
could be splashed with liquids.

Do not install in locations where it can be
adjusted by the public.
Cable Lengths and Sizes
The cable for the temperature controller should be a
non-polarized two-core cable with a minimum gauge
of 22 AWG. The maximum cable length from each
controller to the water heater depends on the total
number of wired controllers connected to the water
heater.
Number of Wired Maximum Cable Length for each
Controllers
1
2
3 or 4*
* Only 3 additional controllers can be wired to the
indoor water heater.
22
Controller to Water Heater
328 ft (100 m)
164 ft (50 m)
65 ft (20 m)
Configurations
A maximum of 4 temperature controllers can be
installed for a water heater or bank of water heaters.
This includes the controller built into an indoor water
heater. Controllers can only be wired in parallel.
Controllers cannot be wired in series.
Rinnai
Water
Heater
The 4 temperature controllers can consist of multiple
MC-91-2 or MCC-91-2 but only one BC-100V and only
one MC-100V.
The clock function on the BC-100V will only be
available if an MC-100V is also connected.
If 4 MC-91-2's are installed, simultaneously press the
Priority and On/Off buttons on the fourth controller
until a beep sounds.
VC Series Manual
Maximum 4 Controllers
Wire controllers in parallel