Pump Fuse Replacement; Pump Motor Replacement - Hach EC1000 Instruction Manual

8.3.2 Pump Fuse Replacement

Note: UL/CSA type fuses
are required for use in
North America, and IEC
type fuses is required for
use in Europe.

8.4 Pump Motor Replacement

The fuses are located on the circuit board under the electrical cover (see Figure 20 on page
69). To replace the fuses, disconnect power to the pump and remove the electrical cover by
removing the four corner screws (see Figure 20 on page 69). There are three fuses on the
board. Both sides of the power line are fused with F1 and F2. Replace these two fuses with
0.2A fuses for 115 V operation or 0.1A fuses for 230 V operation. Fuse F3 is replaced
with a 0.5A fuse for either line voltage operation.
1. Turn the power switch off and disconnect all power to the pump assembly!
2. Open the pump cover by loosening the two thumb screws on the right-hand side of
the cover.
3. Remove the pump tubing from the pump assembly and replace the pump cover so no
parts are lost.
4. Remove four screws from the electronics cover inside the pump enclosure.
5. Disconnect the two wires that lead to the pump motor from the terminal strip labeled
J2 on the circuit. The terminal strip is located on the upper right hand side of the
circuit board.
6. Remove the two screws that attach the pump assembly to the inside of the enclosure.
7. Remove the pump assembly from the enclosure.
8. Locate the two screws that attach the pump motor to the pump assembly and carefully
remove them, being careful not to lose the two nuts in the pump housing.
9. Carefully remove the motor and bracket from the pump assembly. Set the old motor
aside and align the shaft pin on the new motor with the cam in the pump assembly.
10. Rotate the motor until the mounting holes on the motor align with the slots on the
pump assembly.
11. Making sure the mounting nuts are still in the pump housing, install the new motor
and the bracket removed in Step 8 onto the pump assembly.
12. Install the two screws removed in Step 6.
13. Install the pump assembly into the enclosure and replace the two mounting screws.
14. Reconnect the two motor wires to the terminal strip connector labeled J2 on the upper
right hand side of the circuit board, replace the electronics cover and secure it with the
four screws removed in Step 4.
15. Remove the pump cover and place the pump tubing back into the pump assembly.
Replace the pump cover and evenly tighten the four thumb screws.
16. Reconnect the power source.
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