Rinnai EX22C Service Manual download pdf (Page 29)

Rinnai Direct Vent Service Manual 29

RHFE-431WTA

RHFE-556WTA

Troubleshooting

(TR) Transformer:

Read Voltage across:

(SP) Sparker Board:

Set your voltage meter on the 400k scale, unplug the (5) pin connector on the sparker board. When reading

across the two lugs the blue and red wire connect to, you should read somewhere between l00k and 120k ohms

of resistance. When checking the spark sensing circuit, check across the orange wire (pin #35) and gray wire (pin

#32) on your 40 VDC scale. You should read between 4 - 5 VDC. During the spark this voltage will drop to

approximately 0 VDC. Once unit ignites the voltage will go back up to 4 - 5 VDC.

WIRE COLOR

VOLTAGE

RESISTANCE

READING

NUMBERS

White - White

98 - 105 VAC

6 - 19 ohms

21 - 27

Red - Red

28 - 50 VAC

1 - 3 ohms

30 - 31

Black - Blue

10 - 15 VAC

0.5 - 2.5 ohms

22 - 23

Blue - Yellow

130 - 185 VAC

200 - 400 ohms

23 - 32

Grey - Grey

110 - 120 VAC

10 - 14 ohms

17 - 18

Purple - Purple 4.5 - 5.5 VAC

1 - 2 ohms

24 - 25

Black - Yellow 165 - 185 VAC 200 - 212 ohms 22 - 32

Brown - Purple 2.2 - 2.8 VAC 0.7 - 1.2 ohms 24 - 28

Blue - Red 85 - 110 VAC see below 33 - 36

WIRE COLOR

VOLTAGE

RESISTANCE

READING

NUMBERS

WARNING

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 furnace.

You MUST be a qualified service person before proceeding with these test instructions.

Before checking resistance readings, turn off power source to unit and then isolate each item to be checked from

the circuit by unplugging it.

When setting gas pressures on one of these units, please check the complete model number you are trouble-

shooting. Gas pressures and dip switches can vary among models. Always check the rating plate for complete

information and follow directions.

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Rinnai EX22C Service Manual Page 29

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