User Manual

ManualsBrandsAZEL ManualsRelaySINGLE STAGE AND TWO STAGE DIGITAL SETPOINT TEMPERATURE CONTROL: DST-777

Steps

Step1

Step 2

Step 3

Step 4

Step 5

Procedures

SET

Up Down F C

SET

Up Down

SET

H1 C1

Up Down C1

SET

PdF Up Down

SET

CyC Up Down

SET

To start programming, press the key for 3 seconds to access the

Fahrenheit/Celsius mode. The lower LCD display will show the current status,

either for degrees Fahrenheit or for degrees Celsius. This annunciator will be

flashing. Then press either or key to toggle between the or scales.

Press key again to access the setpoint mode. The lower LCD will display the

current setpoint (flashing) and the upper LCD will display annunciator. Then

press either the key to increase or the key to decrease the set point to

the desired setting.

** Please note that this value as well as all the temperature related value are

in degree Fahrenheit as set in step 1.

Press key again to access the heating or cooling mode. The upper LCD will

display the current mode, with flashing annunciator, either for heating or

for cooling. Then press either the key or the to toggle between the

or operation.

Press key again to access the PWM differential mode. The lower LCD will

display the current PWM differential (blinking) and the upper LCD will display

annunciator. Then press either the key to increase or the key to

decrease the differential to the desired setting.

Press key again to access the PWM Cycle Length. The lower LCD will

display the current PWM Cycle Length(blinking), in seconds and the upper LCD

will display . Then press either the key to increase or the key to

decrease the delay to the desired setting. The increment is in 10 seconds. Press

key again to go back to normal operating mode.

Description

Fahrenheit or Celsius Scale

Setpoint Temperature

Cooling or Heating

PWM Differential

Temperature

PWM Cycle Length

The default value is

Default setting is:

Default is:

75F

300 seconds.

LCD Display

75f

P8f

Programming Steps for PWM Control Mode

Note: Set PWM slide switch to ON

300

C8c

Keypad Lock:

Keypad can be locked to prevent tempering by unauthorized personnel. This

is done by pressing , and keys at the same time for three

seconds. The word “ ” appears on the LCD screen for 3 seconds which

indicates that the keypad is locked. Then input from the keypad is disabled.

Press , and keys at the same time again for another three

seconds to unlock the keypad. The word “ ” appears on the screen for 3

seconds which indicates that the keypad is enabled.

Factory setting: unlock

SET Up Down

Review Mode:Setting

Press both and keys at the same time to review the current control

settings. Then Press (or ) key to scroll through the settings in the

same order as Program Mode (F/C scale, Setpoint, Differential,

Heating/Cooling, Anti Cycle Time Delay etc.). To exit to normal mode,, press

one more time (eg. AC1) or press both

and at the same time. In this mode, the settings cannot be

changed.

Up Down

Upfrom the last setting

Down

key

keys

Reset:

Press key if the following changes are made after the control is

powered up:

Slide switch settings

RESET

ime related parameters such as anti-cycle time delay or PWM cycle

length

After reset, the control will start from the beginning and run on these new

settings

max

Min

95f

52f

Troubleshooting Error Messages

If the upper LCD display shows flashing “Err” and

the lower LCD display shows S1, the sensor probe

is short circuited.

If the upper LCD display shows flashing “LLL” and

the lower LCD display shows S1, the sensor probe

is open circuited or the sensor temperature is out

of the lower range. The relay 1 will be de-

energized.

E88

Lll

Hhh

If the upper LCD display shows flashing “HHH” and the

lower LCD display shows S1, the sensor temperature

is out of the upper range. The relay 1 will be de-

energized.

Use the same procedures as above with flashing “LLL”

Action: Verify if the sensor temperature is open circuited or out of the lower

range. If not, check for proper sensor operation by comparing it to a

known ambient temperature. The easiest way is to get an Azel

Technologies DS-60P digital temperature gauge which displays two P-01

sensor temperature. Connect this sensor to DS-60P and compare the

reading with the good sensor.

The second way is to obtain the P-01 resistance table from the

manufacturer. Then use a ohmmeter to measure the resistance across

the two sensor leads and compare to the temperature reading at the

sensor location.

Max/Min Memory Mode:

SET

Maximum and Minimum sensor temperature are

recorded in the memory. To view the max./min.

Temperature:

1. From normal operating mode, press

key once (eg. Just for 1

second).The upper LCD will display

the maximum recorded sensor

temperature and the lower LCD will

display the minimum recorded sensor

temperature.

2. Press once more to exit to

normal operating mode.

SET key