Rinnai B20 Service Manual download pdf (Page 69)

REU-2532W Series 69 Rinnai

SERVICEMAN’S TROUBLESHOOTING INFORMATION

for the

RINNAI “CONTINUUM REU2532-W

” WATER HEATERS

IMPORTANT SAFETY NOTES:

There are a number of (live) tests that are required when fault finding this product. Extreme care

should be used at all times to avoid contact with energized components inside the water heater.

Only trained and qualified service agencies should attempt to repair this product.

Remember, before checking for resistance readings, you should disconnect the power source to

the unit and isolate item the to be checked from the circuit (unplug it)

(TR) Transformer:

Wire color Voltage Resistance Connector # Pin #’s

Black ~ White 100 ~ 120 VAC 51 ~ 63 ohms F9 1 ~ 2

Blue ~ Brown 110 ~ 120 VAC 51 ~ 63 ohms F7 1 ~ 3

(SV0, SV1, SV2, SV3 and POV) Gas valve and Modulating solenoids: (Set meter above 2K)

(SV0) Pink ~ Black 80 ~ 100 VDC 1,8K ~ 2K ohms E1 1 ~ 2

(SV1) Black ~ Yellow 80 ~ 100 VDC 1,8K ~ 2K ohms E2 2 ~ 3

(SV2) Black ~ Blue 80 ~ 100 VDC 1,8K ~ 2K ohms E3 2 ~ 4

(SV3) Black ~ Brown 80 ~ 100 VDC 1,8K ~ 2K ohms E4 2 ~ 5

(POV) Pink ~ Pink 2 ~ 15 VDC 67 ~ 81 ohms C2 3 ~ 4

(M) Water Flow Control Device Servo or Geared Motor:

Red ~ Blue 11 ~ 13 VDC 22 ~ 26 ohms B2

9 ~ 10

Grey ~ Brown 4 ~ 6 VDC N/A B2 5 ~ 7

Grey ~ Yellow

N/A N/A

B2 5 ~ 8

Grey ~ Orange 11 ~ 14 VDC N/A B2 5 ~ 6

NOTE: The grey wire listed above turns to black at B connector on the PCB, the orange wire turns to red.

(QS) Water Flow Sensor:

Black ~ Red 11 ~13 VDC 5.5K ~ 6.2K B4 5 ~ 6

Yellow ~ Black 4 ~ 7 VDC 1 meg ~ 1.4 meg B4 1 ~ 5

By-pass Flow Control:

Brown ~ White

Orange ~ White

2 ~ 6 VDC Unit in operating

mode

G4 ~ G5

G2 ~ G5

4 ~ 5

2 ~ 5

Yellow ~ White

Red ~ White/ Ground

15 ~ 35K G1 ~ G5

G3 ~ G5

1 ~ 5

3 ~ 5

(IG) Ignition System:

Grey ~ Grey 90 ~ 100 VAC N/A F8 2 ~ 3

(FM) Combustion Fan Motor:

Red ~ Black 6 ~ 45 VDC N/A A1 1 ~ 2

1 2 ... 64 65 66 67 68 69 70 71 72

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Rinnai B20 Service Manual Page 69

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