REU-2532W Series 70 Rinnai
White ~ Black 6 ~ 45 VDC 9.2K ~ 9.4K A1 2 ~ 4
Yellow ~ Black 11 ~ 13 VDC 3.5K ~ 3.9K A1 2 ~ 3
Set your meter to the hertz scale. Reading across the red and yellow wires at terminals 2 and 3 you should
read between 60 and 350 hertz.
Thermal Fuse:
Red ~ Red 100 VAC Below 1 ohm B ~ C B6 ~ C1
Overheat Switch:
Red ~ Red 100 VAC Below 1 ohm B ~ C B6 ~ C1
Flame Rod:
Place one lead of your meter to the flame rod and the other to earth or ground. With the unit running you should read
between 5 ~ 150 VAC. Set your meter to the µ amp scale, series your meter in line with the flame rod. You should read
1µ or greater for proper flame circuit. In the event of low flame circuit remove the flame rod and check for carbon and/or
damage.
Heat Exchanger, Air Temperature, and Outgoing Water Temperature Thermistors:
Check all thermistors by inserting meter leads into each end of the thermistor plug. Set your meter to the 20K
scale and read resistance. You should be able to apply heat to the thermistor bulb and see the resistance
decrease. Then apply some ice to the thermistor and the resistance should increase. See below for examples
of temperatures and resistance reading at those temperatures.
Example: 59ºF = 11.4 ~ 14K
86ºF = 6.4 ~ 7.8K
113ºF = 3.6 ~ 4.5K
140ºF = 2.2 ~ 2.7K
221ºF = 0.6 ~ 0.8K
Outgoing Water Thermistor:
White ~ White N/A See example above B B3 ~ B4
Heat Exchanger Temperature Thermistor:
White ~ Pink at board N/A See example above B B3 ~ B12
Surge Protector:
Black ~ White 108 ~ 132 VAC N/A Surge Protector D
1
1 ~ 3
Blue ~ Brown 108 ~ 132 VAC N/A Surge Protector D
2
1 ~ 2
With the power off you can check the continuity through the surge protector. Place one meter lead on the top pin #1 of the
surge protector and pin #2 on the bottom of the surge protector. Then check across top pin #3 and bottom pin #1, if you
read continuity across these two points the surge protector is good. If you do not get continuity, replace the surge protector.
Remote Controls:
Terminals D
1
10 ~ 13 VDC digital 1.5K ~ 1.9K ohms H
1 ~ 3
Frost Protection:
This unit has four frost protection heaters mounted at different points inside the unit, to protect the water
heater from freeze ups. There are two heaters located on the outlet hot water line next to the thermistor.
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