Duke HDC3-37.5-208 Service Manual - Page 11

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TESTING AND TROUBLESHOOTING

COMPONENT TESTING

Most component testing can be performed using

a Digital Multimeter.

NOTE: When a continuity test is being performed,

the HDC3/HDC6 must be isolated from the

power source to prevent damage to the test

equipment.

Primary Power Check

CAUTION: Input voltage source must

match voltage indicated on

dataplate. Voltage should be 208

or 240 VAC depending upon the

application.

1. Check the input voltage source for correct

measurement of 208 or 240 VAC. If input

voltage is not present, check for open circuit

breakers or fuses supplying the input power.

2. Measure the voltage across the input terminals

on the Main Power On/Off Switch. Voltage

should be the same as input voltage source.

If voltage is not present, check power source

and power cord.

3. Set the Main Power On/Off Switch to on and

check for source voltage across the switch

output terminals. If voltage is not present

replace switch.

4. Measure voltage across primary of 24 Volt Step-

Down Transformer. If voltage is not present,

check wiring. If input voltage is present, the

primary power check is complete.

Service Manual for Dry Channel HDC3/HDC6 Units

Fault Conditions

Fault conditions are indicated on the Control

Display.

1. High Temperature Fault – For a High

Temperature Fault the display will show "HIX",

where X indicates the channel ("F" for front,

"C" for center, and "b" for back). A buzzer will

sound for one second every 30 seconds. The

operator can cancel this alarm by pressing any

button on the Control Panel. The alarm will

reactivate after 20 minutes if the problem has

not been rectified. Both relays for the channel

will be turned off while the fault exists.

2. Low Temperature Fault – For a Low

Temperature Fault the display will show

"LOX", where X indicates the channel

("F" for front, "C" for center, and "B" for back).

A buzzer will sound for one second every 30

seconds. The operator can cancel this alarm

by pressing any button on the Control Panel.

The alarm will reactivate after 20 minutes if

the problem has not been rectified.

3. Probe Open/Short – For a Probe Open/ Short

Fault the display will show "PRX", where X

indicates the channel ("F" for front, "C" for

center and "B" for back). The operator can

cancel this alarm by pressing any button on

the Control Panel. The alarm will reactivate

after 20 minutes if the problem has not been

rectified. The relays for both zones of the

channel with a probe fault will be turned off

while the fault exists. The control will display

000°F for the temperature of the channel with

the fault condition.