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7.5 Guidelines for Additional Temperature Controllers
All Rinnai Tankless Water Heaters are equipped
with an integrated digital temperature controller
that allows for a precise water temperature
set-point. Additional digital temperature controllers
are available as accessories and must be
purchased separately (detailed installation steps
included with purchase).
Wiring
A maximum of four temperature controllers can
be installed for a water heater or bank of water
heaters; this includes the controller built into a
Rinnai Tankless Water Heater. Controllers can
only be wired in parallel; they cannot be wired in
series.
Figure 100
Connect controller cable to
mating terminal at bottom
right side of PC Board.
(Detailed wiring instructions
Figure 101
68
Four Temperature
Controllers
Wiring illustration
included with temperature
controller package)
Rinnai Tankless Water Heater Installation and Operation Manual
Cable Lengths and Sizes
The temperature controller cable should be a non-
polarized two-core cable with a minimum gauge
of 22 AWG. The maximum cable length from
each temperature controller to the water heater
depends on the total number of wired controllers
connected to the water heater.
Table 23
Number of Wired
Controllers
1
2
3 or 4 *
* Only three additional controllers can be wired to
the water heater.
Location
• The temperature controller should be out
of reach of small children.
• Avoid locations where the temperature
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
temperature controller can be adjusted by
the public.
Maximum Cable
Length for Each
Controller to Water
Heater
328 ft (100 m)
164 ft (50 m)
65 ft (20 m)
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