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Rinnai Tankless Water Heater Installation and Operation Manual 87
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.
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.
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)
Four Temperature
Controllers
Connect controller cable to
mating terminal at bottom
right side of PC Board.
Wiring illustration
(Detailed wiring instructions
included with temperature
controller package)
* 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 digi-
tal display may be dicult to read in direct
sunlight.
• Avoid locations where the temperature con-
troller could be splashed with liquids.
• Do not install in locations where the tem-
perature controller can be adjusted by the
public.
Figure 83
Figure 84
Table 34
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