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1. Features
ZL-220A is an electronic thermostat for cooling. The device is ideally fitted to refrigeration equipment for cold
storage.
2. Main Function
●
Temperature measurement
●
Temperature display
●
Temperature calibration
●
Compressor delay protection
●
Blustering when system warning
●
Sensor problem warning
● Defrost control: Periodical defrosting, temperature and time combined criteria, dropping water, and
manual forced defrosting
3. Main Specification
●
Temperature Sensor: NTC
●
Setting Range: -40～120℃
●
Display Range: -50～130℃
●
Working Temperature: -10～45℃
●
Storage Temperature: -30～70℃
●
Humidity: 5～85%RH (without dewing)
●
Power Supply: 185 ~ 245VAC 50/60HZ
●
Terminal Wire: <= 2 * 1.5mm2 or 1 * 2.5mm2
●
Load Current: 3A 250Vac（Resistive load）
●
Protection Degree: IP30
4. Operation Instruction
4.1 Display Indication
4.1.1 Panel LED Indication
LED On Off Blinking
MAX TEMP Set max temperature Set max temperature
(to be set)
MIN TEMP Set min temperature Set min temperature (to
be set)
COOL Compressor on Compressor off Delay protecting now
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DEFROST Defrosting now Dropping water ends Dropping water now
4.1.2 Panel Digit Indication
Three red digits display the measured temperature and warning code.
Warning Code:
No. Display Code Warning Information
1 E1 Room sensor open circuit
2 -E1 Room sensor short circuit
3 E2 Defrosting sensor open circuit
4 -E2 Defrosting sensor short circuit
5 Hi Room temperature exceeds the MAX TEMP
6 Lo Room temperature exceeds the MIN TEMP
7 EE Data access error
8 Err Password error or max/min temperature set invalid
9 dEF Defrosting now
10 Frd Forced cooling
11 UnL Restore the default password ”11”
4.2 Keypad Operation
4.2.1 Set Max and Min Temperature
● Press 【SET】, MAX TEMP LED will be on, and the digits will show the current max temperature. Press
key 【▲】 or 【▼】 to change the max temperature setting. Press 【SET】 again, we can set the min
temperature limit. Keeping depressing 【SET】 for 3 seconds, or do not press any key for 30 seconds,
the device will leave the temperature testing mode.
● The factory setting: max temperature is -15 , min temperature is ℃ -18 .℃
● The MAX TEMP must be higher than the MIN TEMP 1℃, otherwise could not be saved.
Note: Only after the【SET】being depressed for three seconds, will the set data be confirmed and saved.
4.2.2 Set System Parameters
Enter Into System Parameter Setting Mode
Keep depressing 【SET】 for three seconds, digits show “POO”. Input password + 【SET】. If correct,
enter into the mode, else return.
After enter into the mode, the display shows “U01”. Press 【▲】 or 【▼】 to select the parameter code.
Press【SET】 will show the parameter value. Then press 【▲】 or 【▼】 to set this parameters, and
press【SET】 to return. The factory setting: password is “11”.
4.2.3 Exit the Mode
Keep depressing “SET” for three seconds, the set parameters will be saved, the mode exits.
Or do not press any key for 30 seconds, the mode exits, and the set parameters are not saved.
4.2.4 Parameter Code and Description Table:
N
o.
Parameter code Function Range Explain
Factory
setting
1
U10 Compressor power on delay time
1～100min
3
2
U11 Compressor MIN continuous work time
0～100min
3
3
U12 Compressor run frequency
0～8
0: Disable 5
4
U20 Room temperature sensor calibration
-9.9～+9.9
0
5
U21 Defrosting sensor calibration -9.9~+9.9 0
6
U30 Defrosting cycle 0~180 hour 0: Not defrost
12
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7
U31
Defrosting﹙end﹚time 1～180min
30
8
U32 Defrosting end temperature
0.5～50℃
15
9
U33 Dropping water time
0～180min
5
10
U34
Over temperature warning delay time
after defrost ends
0~180 hour 0: Disable 2
11
U35 Defrost when the device starts 0~1
0: Disable
1:Enable
0
12
U36 Defrost delay time when the device start
0～180min
0: Disable 0
13
U50
High-temperature warning deviation
value to Max Temp
0~60℃ 0: Disable 0
14
U51
Low-temperature warning deviation
value to Min Temp
0~60℃ 0: Disable 0
15
U52 Over-temperature warning delay time
1～180min
30
16
U53 First over-temperature warning delay
time after power supply
0~180 hour 0: Disable 2
17
U62 Buzzer warning 0~1 0:Warning off
1:Warning on
18
U99 Password 0~99 11
5. Control Function Description
5.1 Compressor Control
● When the temperature ≧“MAX TEMP”, and the time that the compressor has stopped ≧“the valve of
U10”, the compressor starts.
● When the temperature ≦“MIN TEMP”, and the time that the compressor has run ≧“the valve of U11”,
the compressor stops.
● Compressor emergent on
Press and hold “▼”key for five seconds, the compressor will power on if the following meets:
◆controller in non-defrosting status ◆controller in non-dropping water status ◆the compressor stops
In compressor emergent on status, press and hold “▼”key for five seconds, the mode exits.
5.2 Compressor Delay Protection
● After power supply, the compressor is able to start only after the time (U10) has passed.
● After the compressor stops, it is able to restart again only after the time (U10) has passed.
● After the compressor starts, it is able to stop only after the time (U11) has passed.
5.3 Temperature Sensor Failure Protection: Protected Running Mode
●When the room temperature sensor fails, the system will automatically run in the protected running
mode. In this mode, the compressor will run and stop with the period of 30 minutes. Compressor works
for U12* 3 minutes, stop for ﹛30 - (U12* 3) ﹜minutes.
Note: If U12=0, system stops when sensor fails
5.4 Defrosting Function
5.4.1 Automatic Defrosting
When the compressor continuously running time reaches the time of defrost cycle (U30), the system
starts to defrost. When one of the conditions (defrosting end time (U31) and defrosting end
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temperature (U32)) meets, the defrosting stops.
5.4.2 Manual Forced Defrosting
● When in non-defrosting stage, press and hole【▲】 for 7 seconds, the system starts forced defrosting.
When in defrosting stage, press and hole 【▲】 for 7 seconds, the defrosting stops.
5.4.3 Dropping Water Function
System can be set” Dropping water time (U33)”. After defrosting, within “Dropping water time”,
system will not start cooling.
This function will not work when:
◆manual forced defrosting ◆during defrosting, while defrosting sensor fails
5.4.4 Check Defrosting Data
● Check defrosting sensor temperature: When the digit show the room temperature, depress 【▲】, the
digits will show defrost sensor’s temperature. Do not keep depressing for 7 seconds; else the device
will launch forced defrosting.
● Check the left time of defrosting or dropping: During automatic defrosting or dropping process,
depress 【▼】, the digits show the left time.
5.5 High-temperature and Low-temperature warning
● When the test temperature ≥ “MAX TEMP”+ “U50”, and the time reaches to “U52 or U53”,high
temperature warning starts.
● When the test temperature ≦ “MIN TEMP”+ “U51”, and the time reaches to “U52 or U53”,low
temperature warning starts.
6. Temperature Calibration Function
When there is tolerance between the measured temperature and real temperature, set parameter U20 and
u21 to calibrate. The calibration range is ±9.9℃. When set the parameter, the step is 0.1 for every key ℃
press. Keep pressing, the set data will increase/decrease quickly.
7. Restore the default password
When password forgotten, the following way can restore it:
Press and hold “▲”and “▼”key, turn on the power supply, the device displays “UnL”, after three seconds,
buzzer sounds, system auto restores the default password“11”.
8. Controller Installation
8.1 Warning
Avoid installing the device in the following environment:
● Relative humidity is greater than 90%, or possibly dewing.
● Strong vibration.
● Possibility be dropped, or within fog.
● Exposed to eroding and polluting gases (such as: air containing sulfur and ammonia, salty fog, smoky
mist) to prevent erosion and oxidation.
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● Under strong electrical and magnetic fields such as under a powerful antenna, or near a huge power
motor.
● Ambient temperature changes greatly or quickly, such as before the door of a cold room.
● Ambient containing explosive or inflammable materials/gases.
● Exposure to dusty air (possibility be oxidized to form corrosive patina, and reduce the insulating
performance)
8.2 Installation Procedure
Insert the controller into hole (step one) Slide the bracket to fix the device (step two)
9. Electrical Connection
Warning
● Electrical wiring must be manipulated by certified electrician.
● Wrong power supply may damage the device and system seriously.
● Try with effort to layout the sensors and switches line apart from inductive load lines and power supply
lines. The sensors and switches lines are not allowed go with the power supply lines and inductive load
lines in a same pipeline, and are not allowed to pass near the contactor, breaker and the similar.
● Reduce the length of sensors’ wiring as possible, avoid forming a spiral line near the power device.
Sensors’ line must be shielded cables (per sectional area more than 0.5mm2).
● Avoid direct contact with the internal electronic components.
● After finish and check the electrical wiring layout, before connect them to the device, please
follow this instruction: Pay attention the “electrical wiring diagram” below, wrong connection possibly
damage the device and the system, and may be dangerous to the user. All security and protecting device
for the equipments are necessary. They are very important to protect the equipments, and the user’s
safety.
Electrical wiring diagram:
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