Elitech STC-9200A Temperature Controller User Manual

: June 3, 2024
: Elitech

Table of Contents

Elitech STC-9200A Temperature Controller
Operation and display panel
Technical parameters
Indicator status
Parameter list
Buttons
- Operation of buttons
Control output
Safety rules
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Elitech STC-9200A Temperature Controller

Product overview
STC-9200A is a universal-type temperature controller. It includes two channels of temperature sensors at maximum for adjusting cabinet temperature and controlling defrost. Support defrost sensor, defrost relay, fan relay and copy card.

Operation and display panel

Specification
Mounting size: 71 29 (mm)
Product size: 78.5 34.5 * 82 (mm)

Technical parameters

Temperature measuring range: -50°C~99°C or -50°F~ 99°F (Only when sensor calibration value is set to 0.)
Temperature resolution: 0.1°C/°F(cabinet sensor), 1’C/°F (evaporator sensor)
Temperature accuracy: #1°C (-40°C~50C); +2°C ( 50’C ~70°C); +3°C (others); or +2°F (-40°F*99°F ); #6°F (others)
Temperature control range: -50°c/°F99°c /°F
Power supply: 220:10%(VAC). 50/60HZ;
Overall power consumption: <3w
Output capacity:
Refrigeration: 8A/Deft st: 8A/ Fan: 8A
Ambient temperature: 0°C~55°C
Storage temperature: -25°C75°C, relative humidity: 20%85% (non-condensing)

Indicator status

Indicator	Symbol	Status	Meaning
Set	set	On	Set parameters
Off	Measuring & controlling
Flash	Check temperature setting
Refrigeration	****	On	Refrigerating runs.
Off	Refrigeration stops.
Flash	Refrigeration delays.
Defrost	****	On	Defrosting runs / Drip starts.
Off	Drip stops.
Flash	Defrost delays.
Fan	****	On	Fan starts.
Off	Fan stops.
Flash	Fan delays starting after defrost.
Temperature unit	° C	On	° C is **selected as

current temperature unit.
Temperature unit| | On| ° F is not selected as current temperature unit.**

Parameter list

Menu	Function	Setting range	Default
St	Temperature set-point	Lower temperature set-point~
Upper temperature set-point	-5
Hy	Control hystersis	o.1~10· c 1~25 l’	2
LS	Lower temperature set-point	-5o c ~st -5o l’ ~st	-20
US	Upper temperature set-point	St~ 99 C St~ 99 1′	20
at	Cabinet sensor calibration	-9.9~9.9 C -20~20 l’	a
AC	Delay time to prevent frequent start	o~so min	3
td	Defrost mode	EL: Electric heating defrost in: Hot gas
defrost	EL
dE	Defrost stop temperature	-50~90 c -50~90 l’	10
id	Defrost cycle	0~99 hour	6
Md	Max defrost duration		30
dF	Panel display during defrosting	rt: Cabinet temperature

it: Cabinet temperature when defrost starts

St: Temperature set-point

dF: dF

| ****

rt

on: Fan keeps running, and stops during defrost.

Cy: Fan starts and stops simultaneously with refrigeration, and runs during defrost.

oy: Fan keeps running.

Note

After Celsius/ Fahrenheit switch, the user needs adjusting the value of other related parameter items to ensure the configuration correct.
The default parameters in the manual are subject to change without notice.

Buttons

Button names and functions

Button	Function	Action	Indicator
Set	View temperature set-point	Press and release	****

set is Flash.

Exit parameter settings

| Press it and the controller responds.| set is off.
Reset parameter| Press and hold for 3 sec| If c succeeds, the panel displa;s “rst”
| View previous parameter item or decrease parameter value| Press it and the controller responds.| set is on.
Upload parameters to the copy card| Press and hold for 1 sec| If it succeeds, the panel displays “uP”; if it fails, the panel displays “Er”;
| View next parameter item or increase parameter value| Press it and the controller responds.| set is on.
Download parameters from the copy card| Press and hold for 1 sec| If it succeeds, the panel displays “do”; if it fails, the panel displays “Er”; if copy card parameter is inconsistent with controller model, the panel displays “EP”.
****| View evaporator sensor temperature| Press it and the controller responds.| The panel displays evaporator temperature
Start manual defrost| Press and hold for 2 sec| is on.

Operation of buttons

View temperature set-point:
Press and release Set button, the panel displays temperature set-point and the indicator set lights.
Press Set or wait 15 seconds without pressing any button to return to normal display.

Modify temperature set-point:
Press and hold Set button 2 seconds, the panel displays temperature set-point and indicator set lights.

Press or to modify the set-point in 15 seconds.
Press Set or wait 15 seconds without pressing any button to save the new set- point.

Modify parameter value:
Modify user layer parameter (layer 1 Pr1)

Press and hold Set and 3 seconds to enter the user layer menu, the indicator set lights.
Select parameter item and press Set again to display its value.
Press or to modify the value
Press Set to confirm the value and display next parameter item.
Press Set and or wait 15 seconds without pressing any button to save the new value and exit.

Modify hidden layer parameter (layer 2 Pr2)
(In hidden layer, all the parameter items can be viewed (Pr1, Pr2).)

Press and hold Set and 3 seconds to enter the menu, user layer, the indicator set lights.
Press and hold Set and 7 seconds, the panel displays L2; release the two buttons, it displays Hy, indicating entering hidden layer.

Select parameter item and press Set again to display its value.

Press or to modify the value.
Press Set to confirm the value and display next parameter item.
Press Set and or wait 15 seconds without pressing any button to save the new value and exit.

Note: If there is no parameter item in Pr1, the panel will display “nP” after entering Pr1; press and hold Set and until 12 is displayed to enter Pr2.
Move parameter item from Pr2 to Pr1 (i.e. reverse movement)

In Pr2, press Set and to move parameter item between Pr2 and Pr1.
In the movement process, the decimal point turns off to indicate the parameter item is moved to Pr1, and the decimal point lights to indicate the parameter item is only visible in Pr2.

Lock/Unlock buttons

Press and hold and more than 3 seconds, the panel displays “oF” and buttons are locked. Parameters cannot be adjusted, defrost cannot be started or stopped manually.
Press and hold and more than 3 seconds, the panel displays “on” and buttons are unlocked.

Parameter reset
Press and hold set and more than 3 seconds, the panel displays “rst”, indicating a successful parameter reset. Each parameter is reset to the value downloaded to the controller by copy card.
Manual defrost
In non-setting status, press to view current temperature measured by evaporator sensor (when evaporator sensor is enabled and normal). Press and hold 2 seconds to force defrost to start.

Copy card
Upload (copy the parameters in the controller to copy card)
Use buttons to set parameters.

Insert copy card, press until the panel displays “up”
Remove copy card after 3 seconds and then power on the controller again.
Download (copy the parameters in copy card to the controller)
Insert copy card, press until the panel displays “do”.
Remove copy card and power on the controller again after 3 seconds.

Note: The display of “Er” indicates programming failure. Check whether the copy card is connected and repeat the above operation.
The display of “EP” indicates that the data in the copy card is not consistent with the controller model and programming fails. Please use correct copy card or upload data to the copy card again. Then repeat the above operation.
(*Please keep a stable power supply and effective connection of copy card in the process. Do not remove the copy card before completely finishing the operation.)

Control output

Refrigeration:

In normal status:
Refrigeration starts when cabinet temperature > temperature set-point + control hystersis (Hy), and delay time to prevent frequent start (AC) elapses.
Refrigeration stops when the cabinet temperature s temperature set-point.
Refrigeration starts when the controller is energized for the first time, output delay after being energized (od) elapses, cabinet temperature> temperature set-point + Hy.

In case of cabinet sensor fault:
Refrigeration/heating runs in cycle per the set start and stop time. Wherein,

When Cy=0 and Cn=0, refrigeration stops.
When Cy=0 and Cn#0, refrigeration stops.
When Cn=0 and Cy#0, refrigeration starts.

Defrost:

id=0, defrost is disabled.
id#0, not in defrost status:
When evaporator sensor is enabled (P2=y), and the temperature of evaporator sensor > defrost stop temperature (dE), defrost cannot start.
When evaporator sensor is enabled (P2=y), and the temperature of evaporator sensor < defrost stop temperature (dE),or evaporator sensor is disabled (P2=n), defrost starts under any one of the following conditions:
a. When defrost cycle (id) elapses, defrost starts.
b. Press 2 seconds to start defrosting.
Defrost delay (dd) elapses, defrost outputs.
During defrosting (defrost stops under any one of the following conditions):
P2=y, and the temperature of evaporator sensor > defrost stop temperature (dE), defrost stops.
When the Max defrost time (Md) elapses, defrost stops.
It starts dripping after defrost. Refrigeration is disabled in dripping time (dt), during which drips generated in defrost are drained. After dripping time elapses, refrigeration cycles.

Note: In defrost process, the panel displays:

dF=rt: Cabinet temperature
dF-it: Cabinet temperature when defrost starts
dF=St: Temperature set-point
dF=dF: dF

Defrost mode

System status

|

Electric heating defrost

|

Hot gas defrost

---|---|---

Refrigeration outputs.

| Compressor is on.| Compresser is on.
Electrical heating is off.| Four-way valve is off.

Defrost delays.

| Compressor is off.| Compressor is off.
Electrical heating is off.| Four-way valve is on.

Defrost outputs.

Fan

Fan running mode:

FC=cn: Fan starts and stops simultaneously with refrigeration, and stops during defrost.
FC=on: Fan keeps running, and stops during defrost.
FC=cy: Fan starts and stops simultaneously with refrigeration, and runs during defrost.
FC=oy: Fan keeps running.
When FC=cn or on, fan can run again after fan start delay after defrost (Fd) elapses.
If P2=y and the temperature of evaporator sensor > fan stop temperature (FS), fan stops.

Fault alarm
The panel displays “P1” or “P2” in case of sensor fault. After the fault is removed, alarm will automatically reset.

Over cabinet temperature limit alarm:
When cabinet temperature > upper alarm limit (AU), alarm delay (Ad) and alarm delay after startup (dA) elapse, the panel will display HA; when cabinet temperature< AU, alarm will be removed.
When cabinet temperature < lower alarm limit (AL), Ad and dA elapse, the panel will display LA; when cabinet temperature >AL,alarm will be removed.

Code	Cause	Output status
Pl	Cabinet sensor fault	Compresso r run s **per

parameters “ C y 11 __**an d “ C n 11

•

nP

| Evaporator sensor is disabled, but the measured temperature value of evaporator sensor is selected to show.| Output does not change.
Er| Programming failure of copy card| Output does not change.

Ep

| The data in copy card is inconsistent with the controller model, so programming fails.|
rst| Successful reset|

Safety rules

Danger:

Do distinguish the ports of sensor lead, power line and relays. Please do not connect lines wrong. The relay cannot be overloaded.
Wiring requires disconnection of power supply first.

Warning:
The controller is forbidden to be used in water or too humid environment, high temperature, strong electromagnetic interference or strong corrosion environment.

Notice:

The power voltage must be in accordance with the voltage labeled on the controller. Please ensure the stability of power voltage.
Suggest to keep suitable distance between sensor lead and power line to avoid possible interference.
In installing evaporator sensor, the sensor should be placed closely to the copper pipe 5 cm to the evaporator inlet.
Please ensure the sensor keeps good contact with the copper pipe.
Remove the sensor by slightly plugging out its end downwards.