Rinnai CU199i - Guidelines for Additional Temperature Controllers

Rinnai Tankless Water Heater Installaon and Operaon Manual 71
6.4 Guidelines for Addional Temperature Controllers
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)
All Rinnai Tankless Water Heaters are equipped with an
integrated digital temperature controller that allows for a
precise water temperature set-point. Addional digital
temperature controllers are available as accessories and
must be purchased separately (detailed installaon steps
included with purchase).
Wiring
A maximum of 4 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.
* Only 3 addional controllers can be wired to the
water heater.
Locaon
• The temperature controller should be out of
reach of small children.
• Avoid locaons where the temperature controller
may become hot (near an oven or radiant heater).
• Avoid locaons in direct sunlight. The digital
display may be dicult to read in direct sunlight.
• Avoid locaons where the temperature controller
could be splashed with liquids.
• Do not install in locaons where the temperature
controller can be adjusted by the public.
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.
A maximum of 4 temperature
controllers can be installed for a water
heater or bank of water heaters
(including the built-in controller)
Wiring illustraon
(Detailed wiring instrucons included with
temperature controller package)
4 Temperature
Controllers
6.4 Guidelines for Addional Temperature Controllers
Connect the controller
cable to the mang
terminal at the boom
right side of the PC Board