Temperature Controller Installation; Location; Configurations; Cable Lengths And Size - Rinnai RC80E Operation And Installation Manual

Temperature Controller Installation

Indoor models have their controller built into the front panel. A kit is available that allows the integrated controller
to be removed and used as a remote controller. Additional controllers can also be installed.

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.

Configurations

A maximum of 4 temperature controllers, including
wired and wireless, 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's or MC-502RC's but only 1 BC-100V and only
1 MC-100V.
Any one of the 5 types of controllers can be installed
by itself and still operate the water heater. All
functions will be available with the exception that the
clock function on the BC-100V will only be available if
an MC-100V is also connected.
If 4 MC-91's are installed, simultaneously press the
Priority and On/Off buttons on the fourth controller
until a beep sounds.
The table to the right shows some of the possible
combinations of controllers.

Cable Lengths and Size

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.
MC-91
MC-91
MCC-91 + MC-502RC +
MC-91
MC-91
MC-91
Manual - Rinnai Condensing Water Heaters
•
Avoid locations where the temperature controller
could be splashed with liquids.
•
Do not install in locations where it can be adjusted
by the public.
Wire controllers in parallel
+ MC-91
+ MCC-91
+ MC-502RC +
+ MC-91
+ MC-502RC + MC-502RC
Number of Wired Maximum Cable Length for each
Controllers
1
2
3 or 4
Controllers
+ MCC-91 + MC-502RC
+ MC-502RC + MC-502RC
BC-100V + MC-100V
BC-100V + MC-100V
+ MC-502RC + BC-100V
+ MC-100V
Controller to Water Heater
328 ft (100 m)
164 ft (50 m)
65 ft (20 m)
33