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7.5 Guidelines for Additional Temperature Controllers All Rinnai Tankless Water Heaters are equipped Cable Lengths and Sizes with an integrated digital temperature controller that allows for a precise water temperature set- The temperature controller cable should be a non- point.Additional digital temperature controllers are polarized two-core cable with a minimum gauge available as accessories and must be purchased of 22 AWG. The maximum cable length from each separately (detailed installation steps included with temperature controller to the water heater depends purchase). on the total number of wired controllers connected to the water heater. Wiring Table 37 A maximum of four temperature controllers can Number of Wired Maximum Cable be installed for a water heater or bank of water Controllers Length for Each heaters; this includes the controller built into a Controller to Water Rinnai Tankless Water Heater. Controllers can only Heater be wired in parallel; they cannot be wired in series. 1 328 ft(100 m) 2 164 ft (50 m) 3 or 4 * 65 ft(20 m) * Only three additional controllers can be wired Four Temperature to the water heater. Controllers 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 difficult to read in direct sunlight. • Avoid locations where the temperature con- troller could be splashed with liquids. Connect controller cable to Do not install in locations where the tem- mating terminal at bottom perature controller can be adjusted by the ® right side of PC Board. public. Wiring illustration ® (Detailed wiring instructions included with temperature Figure 91 controller package) Rinnai Tankless Water Heater Installation and Operation Manual 91