Installation Of Temperature Controller - Rinnai RUCS65i series Installation And Operation Manual

Installation of Optional Temperature
Controller
WARNING
Turn the power off. Do not attempt to connect the
temperature controller(s) 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.
The units referenced in this manual do not include a
temperature controller.
Controller Location

The controller should be out of reach of small
children.

Avoid locations where the controller may become
hot (near an 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 the controller
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
44
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.
Controllers can only be wired in parallel. Controllers
cannot be wired in series.
The 4 temperature controllers can consist of multiple
MC-91-2.
(MC-91-1 should not be installed on a unit that
already has an MC-91-2 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.
Do not install MC-100V and BC-100V.
KCM Series Manual
Wire controllers in parallel