Duke HDC3 Manual de serviço - Página 9

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Main Power On/Off Switch

1. Remove the four screws securing the Relay

Box cover. Set the cover aside for reuse.

2. Tag and disconnect the Main Power On/Off

Switch wires.

3. Squeeze the Main Power On/Off Switch

retaining springs and push the switch out

through the front of the box.

4. Reverse this procedure to install a new Main

Power On/Off Switch.

BEFORE ANY REPLACEMENT

PROCEDURE BEGINS, THE HDC3/

HDC6 MUST BE ISOLATED FROM

THE POWER SOURCE TO PREVENT

Solid State Relay

(SSR)

POSSIBLE ELECTRICAL SHOCK.

Solid State Relays (SSR)

Figure 10. View of SSR

1. Using a Multimeter, determine which SSR has

failed.

2. Tag and disconnect the wires from the faulty

SSR.

WARNING

Service Manual for Dry Channel HDC3/HDC6 Units

3. Remove the two screws that attach the SSR

to the board and remove the faulty SSR.

Transformer

4. Reverse procedure to install a new SSR.

24 Volt Step-Down Transformer

Figure 11. Step-Down Transformer 208/240V

Primary, 24V Secondary

BEFORE ANY REPLACEMENT

PROCEDURE BEGINS, THE HDC3/

HDC6 MUST BE ISOLATED FROM

THE POWER SOURCE TO PREVENT

POSSIBLE ELECTRICAL SHOCK.

1. Using a multimeter test the 24 Volt Step-Down

Transformer to determine whether or not it is

the reason for the failure.

2. Tag and disconnect wires from Transformer.

3. Remove four nuts attaching Transformer

to studs on the relay box body and remove

Transformer.

4. Reverse this procedure to install a new

24 Volt Step-Down Transformer.

WARNING