4. Replace the motor starng relay and capacitor
4.1 Fied with plasc terminal box
1. Switch o the pump and isolate it from the electrical supply. Allow the pump to
cool to a safe temperature.
2. Refer to Figure: Remove/t the motor starng relay. Unscrew the four screws
which secure the cover to the top of the pump-motor and remove the cover.
3. Partly li the old Motor Starng Relay from its retaining slot to access the relay
terminal connecons.
4. Use a suitable screwdriver to remove the terminal connecons o of the relay.
5. Dispose of the old relay safely in accordance with all local and naonal safety and
environmental requirements.
6. Check the code on the motor starng relay to make sure that you have the new
relay (the code should be '4771xxxxxUBx', where x is any character).
7. Hold the new motor starng relay with terminals 1 and 4 at the top (that is,
nearest the motor cover) and t the terminal connecons to the terminals on the
relay as described in Table: Motor starng relay terminal connecons.
8. Slide the motor starng relay into the retaining slot. Make sure that you do not
trap any of the relay wires when you t the relay.
Note
You may have to cut the cable es which secure the relay terminal wires to allow
you to easily t the relay. On some older pump-motors, you may have to rotate the
relay with pins 2 and 3 at the top to t the cover properly.
9. Partly li the old motor capacitor to access the terminal connecons.
10. Use a suitable tool to remove the terminal connecons from the capacitor.
11. Remove the old capacitor and safely dispose of it in accordance with all local and
naonal safety and environmental requirements.
12. Check the marking on the capacitor to make sure that the new capacitor is new
(the capacitor should be 160 mf, code 'KP8174'.
13. Hold the new capacitor as shown in detail C and t the terminal connecons to the
terminals on the capacitor as described in Table: Capacitor terminal connecons.
14. Slide the new capacitor into the pump-motor enclosure. Make sure that you do not
trap any of the wires.
15. Make sure that the voltage shown on the voltage indicator corresponds with your
electrical supply voltage. If it does not, recongure the pump-motor. Refer to the
RV pump instrucon manual.
16. Use the four screws removed in Step 1 to secure the cover to the top of the pump-
motor. Make sure that you do not trap any of the wires when you t the cover.
17. Reconnect the pump to the electrical supply.
Table 1
Motor starng relay terminal connecons
Terminal connecon wire colour Relay terminal
03/2021 - ©Edwards Limited
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A50574840_D - Replace the motor starng relay and capacitor
