thermo-hydro STC-9200 User manual

https://www.thermo-hygro.com
1 / 9
STC-9200 Thermostat
Quick Start Guide
(Version 21.08.02GEN)
STC-9200 digital temperature controller controls three
loads: the refrigeration device, the defrosting unit, and
the Evaporator Fan; Typically suited to an oversized
freezer room.
1. Wiring Diagram

https://www.thermo-hygro.com
2 / 9
2. Set the target temperature
The room temperature was supposed to keep at the
range
from "F1" to "F1 + F2" ("SET" to "SET + HY").
You can set them in the user interface and the Admin
Interface; below is the 2nd method.
Step 1: enter the Admin Interface by hold the [SET] key
and the [ ] key at the same time for 10s; you
will see the code "F1" ("SET").
Step 2: Press the [SET] key to check current value, and
press the key or the key to change the
F1 value;
Step 3: Press the [SET] key to save the new data, and

https://www.thermo-hygro.com
3 / 9
back to the menu list, you will see the code "F1"
("SET") again.
Step 4: Switch to the "F2" ("HY") code by press the
key.
Repeat the above 2-4 steps to update all the code you
want to.
At last:Just leave the unit alone; it will auto quit from
setting mode back to normal status in 10s.
1) F1 (SET): SP (Temperature Set-Point)
2) F2 (HY): Temperature Hysteresis / Return
Difference
3) F3 (US): Upper limit for SP

https://www.thermo-hygro.com
4 / 9
4) F4 (LS): Lower limit for SP
5) F5 (AC): Delay Time for the Compressor and
Delay time for defrosting if it was Hot Gas mode
F10 = 1 (TDF = HTG)
If you found the "F1" (SET) value cannot be modified
to the value you need, please adjust the F3 and F4
(US and LS), which are the limitation for F1 (SET).
3. Configure the Defrosting
This unit controls the defrosting by Time and
Temperature.
Temperature Condition: the evaporation sensor

https://www.thermo-hygro.com
5 / 9
temperature is lower than the preset "defrosting Stop
temperature" F8 (DTE), which is a significant value to
prevent over defrost.
Time Condition 1: the real-time passes the preset
interval time F6 (IDF), a regular parameter for almost
all defrosting thermostats.
Time Condition 2: If the "defrosting method" you take is
the hot gas from the compressor reverse rotary when
F10 = 1 (TDF = HTG), it will count the
compressor's last stops moment plus F5 (ac), which is
a protective value to avoid the compressor frequently
startup and stops.

https://www.thermo-hygro.com
6 / 9
The operates method is just like page 1 shows;
6) F6 (IDF): Defrosting Cycle / Interval Time
7) F7 (ADF): Defrosting Lasting/Running Time
8) F8 (DTE): Defrosting Stop Temperature
9) F9 (FDT): Defrosting Water Dripping Time
10) F10 (TDF): Defrosting Mode:
0 (EL): Electric-Heating.
1 (HTG): Hot Gas from the
compressor.
11) F11 (DCT): Count mode of defrost cycle:
0 (RT): Cumulative time from the
controller power on.
1 (COH): Cumulative time of the
compressor working.
12) F12 (DFD): Display mode when defrosting:
A. 0 (RT): Shows the room sensor
temperature display.

https://www.thermo-hygro.com
7 / 9
B. 1 (IT): Shows the evaporator sensor
temp. (continue showing 10 minutes
once defrosting over)
4. Set the Evaporation Fan?
Check the F15 (FOD) value before others
13) F15 (FOD): Time delay seconds for the Fan
A. < 0: in this case, f15 (FOD) is the period for
the Fan starts earlier than the compressor starts,
Fan stops if defrosting begins.
B. ≥0: Fan was controller by F13 (FMC).

https://www.thermo-hygro.com
8 / 9
14) F13: Fan output modes when f15 (FOD) ≥0
A. 0 (CTR): Fan Starts by F14 (FOT), Stop by
F16 (FST).
B. 1 (O-N): continuous working except defrosting
begins.
C. 2 (C-N): in this case, F15 (FOD) is the time
for the Fan to start later than the compressor;
the Fan stops if defrosting begins.
15) F14 (FOT): Defrost sensor Temp for Fan Starts
16) F16 (FST): Defrost sensor Temp for Fan Stops
5. Set the Alarm
The alarm function is based on the room sensor
temperature, and the Alarm also works if the evaporator
sensor is broken.
17) F17 (ALU): Upper Temperature of the Room
sensor to Trigger Alarm

https://www.thermo-hygro.com
9 / 9
18) F18 (ALL): Lower Temperature of the Room
sensor to Trigger Alarm
19) F19 (ALD): Time delay of the Room sensor to
Trigger Alarm
20) F20 (OT): Temperature Calibration = Real
Temperature - Measured Temperature.
This is not a step-by-step user manual;
It just shows the key points.
The new user should read the Full-Content Version User
Manual
Haswill Electronics
STC-9200 Defrost Fan Controller
Copyright Haswill-Haswell All Rights Reserved