S i p8f 8, 300 c8c, S i e88 s i lll s i hhh – AZEL SINGLE STAGE AND TWO STAGE DIGITAL SETPOINT TEMPERATURE CONTROL: DST-777 User Manual

Page 4

Steps

Step1

Step 2

Step 3

Step 4

Step 5

Procedures

SET

Down

SET

Down

SET

Down

SET

PdF

Down

SET

CyC

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

key to toggle between the

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

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

S i

P8f

H i

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

Down

SET Up

Down

L C

L f

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.

Down

from the last setting

Down

key

keys

Reset:

Press

key if the following changes are made after the control is

powered up:

Slide switch settings
T

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

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.

S i

E88

S i

Lll

S i

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:

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.

Press

once more to exit to

normal operating mode.

SET key