VC Series Manual
Installation of Temperature Controller
Controller Location
Cable Lengths and Sizes
•
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.
Indoor models have their controller built into the
front panel. Additional controllers can be installed.
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
Controllers
Maximum Cable Length for each
Controller to Water Heater
1
328 ft (100 m)
2
164 ft (50 m)
3 or 4*
65 ft (20 m)
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.
WARNING
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.
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.
(MC
-
91
-
1 should not be installed on a unit that
already has an MC
-
91
-
2 connected)
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.
Wire controllers in parallel
Maximum 4 Controllers
Rinnai
Water
Heater
* Only 3 additional controllers can be wired to the
indoor water heater.
©2019 Rinnai America Corporation