Duke HDC3 Panduan Servis - Halaman 14

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Service Manual for Dry Channel HDC3/HDC6 Units

1. Plug HDC3/HDC6 unit into the proper line

source per the dataplate on the unit.

2. Set the Main Power On/Off Switch to on.

3. Line voltage is applied through the Main Power

On/Off Switch to the following:

a. To the primary of the 24 Volt Step-Down

Transformer.

b. Through a junction box to one side of

each of the six Hi-Limit Thermostats.

c. Through each element and to one side

of each respective SSR.

4. The secondary of the Transformer provides

24 VAC to the Control Display, allowing the

Control Board to power on.

5. The Control Board provides a reference set

point temperature and monitors the channel

heat level through the RTD's. If the channel

temperature is less than the set point

temperature for a given channel, the SSR for

that channel is activated.

6. Voltage is routed through the SSR to the

other side of each Heater Element causing

the Heater Element to operate through the

normally closed Hi-Limit Thermostat and begin

raising the temperature of the channel.

SEQUENCE OF OPERATION

7. When the heat reaches the set point

temperature (normally set at 275°F), the SSR

for that channel is turned off disconnecting the

Heater Element.

8. If the SSR does not shut off and the

temperature continues to rise, the Hi-Limit

Thermostat opens at 375°F cutting off power

to the Heater Element. At the same time

the Control Board provides a "High Temp

Fault" indication to the display and turns off

both SSRs to the faulty channel. An alarm

is sounded every 30 seconds. The operator

can cancel this alarm by pressing any

button on the Control Panel. If the fault has

not been corrected, the alarm will reactivate

in 20 minutes.

9. The temperatures measured by the RTD's,

are routed to the Control Display. Each

zone's temperature within the channel will be

displayed when the up button is pressed.

10. The set point temperature for each channel can

be displayed by pressing the down button.