Comfonent Analysis - Rinnai REU-24 W-A Service Manual

Note: the letters in brackets,[i.e. @I), (FJ] refer to the corresponding position of the connection on
the wiring diagram on page 40.
Do not attempt to remove push on connectors from solenoids by pulling on the wires.
Pull on the body of the connectors.
1. P.C.B. Supply Transformer
Voltage measurement should be done
with the power connected. Resistance
must be checked with the power
disconnected.
Refer to transformer values - page 39.
2. Electric Safety Circuit
Voltage measurement should be done
with the power connected. Resistance
must be checked with the power
disconnected.
Fusible Link
a)
2 pin connector (H)
Disconnect pin connector H
(grey/red) from PCB. Connect meter
to grey and red leads.
Grey - Red
. . . below 10 0 is normal.
(Transformer is in circuit)
Remaining Flame Safety Device
b)
2 pin connector (DJ
Brown - Brown
. . . below DC 1 V is normal.
COMPONENT ANALYSIS
3. Water Flow Sensor
a) Measure with the connector connected to
P.C.B.
3 pin connector (A,)
Black(-) - Red(+)
. . . DC 12 V normal.
Black - Yellow . . . Output pulse.
[Frequency counter required to check
pulse]
Normal Output
Water flow
b) M e a s u r e w i t h t h e c o n n e c t o r
disconnected from the P.C.B.
3 pin connector [A,].
Black - Red
. . . Approx 10 k 0.
. . . 00 Q * faulty.
pulse