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ページを印刷する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.
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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.