Hubbell Electric Heater Company J User Manual download pdf (Page 27)

CONTROL BOARD

1. Disconnect power from unit.

2. Disconnect display cable, probe cable (J3), leak detection wire (J2), ground wire (J7), and terminal

block (J5) from the control board. NOTE: The terminal block (J5) is removable from the control

board. Grasp the terminal block on the ends and pull straight away from the board.

Ground Wire (J7) Display Cable Leak Detection Wire (J2) Probe Cable (J3)

Power Wire (Common, White) Connector (J5)

Power Wire (Black) Wire to #1 Contactor (yellow)

Wire to #2 Contactor (red)

3. Remove four (4) screws securing control board to panel.

4. Remove and replace control board.

5. Reconnect wires disconnected in step 2. NOTE: When reconnecting the ribbon cable be sure to have

the key on the cable align with the slot in the connector.

6. Connect power to unit.

RELIEF VALVE

1. Disconnect power from unit.

2. Shut off incoming water supply.

3. Attach hose to drain connection.

4. Lift manual release lever on relief valve to let air into system or break union on outgoing water line.

5. Drain water from tank.

6. Disconnect overflow piping.

7. Unscrew relief valve, remove assembly and replace with new one.

8. Connect overflow piping.

9. Turn on incoming water supply and check for leaks.

10. Connect power to unit.

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Hubbell Electric Heater Company J User Manual Page 27