EWELLY EW-988TK - User Manual

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Version: 988 TK-366-V1.0

EW-988TK Operation Manual

Thank you for choosing Ewelly instruments. This product combines a wide range of refrigeration

technology, which is simple to operate with accurate temperature control and strong anti-interference

ability. It is suitable for a variety of refrigeration, heating equipment and automatic intelligent control

systems. The sensor produced by our company is packaged by a precise process, which has moisture-

proof function and stable performance.

Product Specification

1. Operating Voltage：AC220V±10％; 50HZ/60HZ

2. Output：10A/220V/AC; 10A/220V/AC

3. Power Consumption：≤3W

4. Working Environment：-10℃～50℃；RH≤90％

5. Control Range：-20℃/-5℉～105℃/220℉; (Factory setting: 12℃)

6. Resolution：-20~99.9℃ is 0.1℃; Accuracy: ±0.5℃ ; 100～105℃ is 1℃; Accuracy: ±1℃

-5℉~220℉ is 1℉; Accuracy:2℉

7. Input Signal：1-Off temp. sensor, standard cable length 20K×2m

8. Overall Dimension：80（Width）×32（Height）×70（Depth）mm;

9. Mounting Size：71（Width）×29（Height）mm；

Display Panel

Installation Requirement

1. Please make sure that the power supply voltage meets the required voltage of the instrument. The

deviation should be less than ±10％.

2. The sensor should be kept away from the power cable.

3. Strictly distinguish the interfaces of the sensor, power cable and the relay output.

Operation Instruction

1. Standby function：

Hold “ON/OFF” key for 3 s to enter standby mode, then it displays “ ”and all outputs are

disconnected.

In standby mode, press and hold the “ON/OFF” key for 3s to return to normal operation.

2. Locking function：

Under “Lock” mode, press and hold the “▲” key for 3 s to unlock along with buzzer sounds. This

meter would lock itself automatically after 30s without any actions.

3. Fast temperature setting

Under normal operation, press the "Set" key to display the control temperature (the value flashes).

Press “▲” and “▼” to adjust the parameter values.

Hold “▲” and “▼” key to adjust the parameter value quickly. (This is a general operation).

4. Parameter adjustment

Hold "Set" for 6s until the parameter code "HC" turns on, indicating that the system setting menu has

been entered. Switch the corresponding parameter codes by pressing “▲” and “

▼

”.

Press " Set" to display the parameter value of the corresponding parameter code (the value flashes);

Press “▲” and “▼” to adjust the parameter value.

Press "Set" to confirm the modified parameter value and return to the upper menu.

Under the system setting status, press "ON/OFF" to exit the menu setting and return to the normal

operation.

Under the system setting status, it returns to normal operation automatically when there is no action

in 6s.

5. One-click restore of preset parameters

Under normal operation, press and hold the “▼” key for 6s or more, the display panel flashes, and

all parameters will be reset to factory settings. (please make sure to record the setting parameters

in advance)

6. Stop/Silence buzzer alarm

Press any key to cancel the current buzzer alarm sounds, but the indicator light will not turn off until

the fault is removed.

7. System Menu

Code Description Setting Range

Factory

Setting

Explanation

Cooling

/Heating

Cooling

=Heating

C -

Temp. Unit

Switch

C=Centigrade；

F=Fahrenheit

C -

Temp. Return

Difference

0.1～15℃

1～60℉

2℃/5℉

The target temp. can be controlled

to be stable in a certain setting

range.

Temperature

Calibration

-15~15℃ -60~60℉ 0

This parameter corrects the temp.

when there is an error

Pt Time Delay

0 ～ 10 min

Protect the meter from frequent

start-up

Temp. Upper

Limit

Set temp. +1℃ ～ 80℃

/220℉

80℃ Prevent temp. is set too high

Temp. Lower

Limit

-20℃/-5℉ ～ Set

temp.-1℃

-20℃

Prevent temp. is set too low

Up key

Down key

On/Off key

Set/Confirm/

Return key

Symbol

Description

Status

Explanation

Symbol

Description

Status

Explanation

Cooling

Off Cooling stops

Fahrenheit

Degree

- -

On Cooling on

Parameter

Setting

Parameter

Setting

Flashing

Cooling stops

under cooling

mode

Alarm Signal On Faulty

Heating

Off Heating stops

Standby

Signal

Standby

Mode

On Heating on

Lock

Off Unlocked

On Locked

Flashing

Heating stops

under heating

mode

Centigrade

Degree

- -

Need help?

Do you have a question about the EWELLY EW-988TK and is the answer not in the manual?

The Ewelly EW-988TK is an automatic intelligent control system designed for refrigeration and heating equipment. It offers precise temperature control and strong anti-interference capabilities, making it suitable for a variety of applications. The device features a robust sensor with moisture-proof properties, ensuring stable performance.

Function Description:

The EW-988TK operates in both refrigeration and heating modes, selectable via the parameter setting menu (C for cooling, H for heating).

Refrigeration Mode:

The load relay closes when the current temperature is greater than or equal to the set temperature plus the temperature return difference (d), and the "Set time delay (Pt)" has elapsed.
The relay disconnects, and refrigeration stops when the current temperature is less than or equal to the set temperature.

Heating Mode:

The load relay closes, and the heating function starts when the current temperature is less than or equal to the set temperature minus the temperature return difference (d), and the "Set time delay (Pt)" has elapsed.
The relay disconnects, and heating stops when the current temperature is greater than or equal to the set temperature.

Alarm Mode:

The device incorporates several alarm functions to alert users to potential issues:

E1 Alarm: Displays "E1" with a buzzer sound and disconnects all outputs when the sensor line is open or short-circuited. Pressing any key mutes the alarm.
HHH Alarm: Displays "HHH" with a buzzer sound and disconnects all outputs when the real temperature is greater than or equal to the upper temperature limit (HS) plus the temperature return difference (d). Pressing any key mutes the alarm.
LLL Alarm: Displays "LLL" with a buzzer sound and disconnects all outputs when the real temperature is less than or equal to the lower temperature limit (LS) minus the temperature return difference (d). Pressing any key mutes the alarm.

Important Technical Specifications:

Operating Voltage: AC220V±10%; 50HZ/60HZ
Output: 10A/220V/AC (for both outputs)
Power Consumption: ≤3W
Working Environment: -10℃~50℃; RH≤90%
Control Range: -20°C/-5°F ~ 105℃/220°F (Factory setting: 12°C)
Resolution:
- -20~99.9°C: 0.1°C
- 100~105℃: 1°C
- -5°F~220°F: 1°F
Accuracy:
- ±0.5°C (for -20~99.9°C)
- ±1°C (for 100~105℃)
- ±2°F (for -5°F~220°F)
Input Signal: 1-Off temperature sensor, standard cable length 20K×2m
Overall Dimension: 80 (Width) x 32 (Height) x 70 (Depth) mm
Mounting Size: 71 (Width) x 29 (Height) mm

Usage Features:

The EW-988TK offers several user-friendly features for operation and configuration:

Standby Function:
- Hold the "ON/OFF" key for 3 seconds to enter standby mode, where it displays "---" and all outputs are disconnected.
- In standby mode, press and hold the "ON/OFF" key for 3 seconds to return to normal operation.
Locking Function:
- Under "Lock" mode, press and hold the "▲" key for 3 seconds to unlock with a buzzer sound.
- The meter automatically locks itself after 30 seconds of inactivity.
Fast Temperature Setting:
- Under normal operation, press the "Set" key to display the control temperature (the value flashes).
- Press "▲" and "▼" to adjust the parameter values.
- Hold "▲" and "▼" keys to adjust the parameter value quickly.
Parameter Adjustment:
- Hold "Set" for 6 seconds until the parameter code "HC" appears, indicating entry into the system setting menu.
- Switch between parameter codes using "▲" and "▼".
- Press "Set" to display the parameter value of the corresponding parameter code (the value flashes).
- Press "▲" and "▼" to adjust the parameter value.
- Press "Set" to confirm the modified parameter value and return to the upper menu.
- Under system setting status, press "ON/OFF" to exit the menu setting and return to normal operation.
- The system automatically returns to normal operation if there is no action for 6 seconds.
One-click Restore of Preset Parameters:
- Under normal operation, press and hold the "▼" key for 6 seconds or more. The display panel flashes, and all parameters are reset to factory settings. Users are advised to record current settings beforehand.
Stop/Silence Buzzer Alarm:
- Pressing any key cancels the current buzzer alarm sound, but the indicator light remains on until the fault is resolved.
System Menu Parameters:
- HC (Cooling/Heating): C=Cooling, H=Heating. Factory setting: C.
- CF (Temp. Unit Switch): C=Centigrade, F=Fahrenheit. Factory setting: C.
- d (Temp. Return Difference): 0.1~15℃ (1~60°F). Factory setting: 2°C/5°F. This parameter controls the stability range of the target temperature.
- CA (Temperature Calibration): -15~15℃ (-60~60°F). Factory setting: 0. Corrects temperature when there is an error.
- Pt (Time Delay): 0~10 min. Factory setting: 1. Protects the meter from frequent start-up.
- HS (Temp. Upper Limit): Set temp. +1°C ~ 80°C (Set temp. +1°F ~ 220°F). Factory setting: 80°C. Prevents temperature from being set too high.
- LS (Temp. Lower Limit): -20°C/-5°F ~ Set temp.-1°C (Set temp.-1°F). Factory setting: -20°C. Prevents temperature from being set too low.

Maintenance Features / Troubleshooting:

The manual provides a troubleshooting guide for common issues:

No display when power is on:
- Causes: Power source off, or temperature controller defective.
- Solutions: Check power supply and fuse; check input for power terminal; arrange to change controller with distributors.
With display but not operating:
- Causes: Set temp. within rest interval; external circuit protection; incorrect set running mode.
- Solutions: Reset required temperature control value; check overrun and overload; check overheat causes and eliminate troubles before resetting.
Displayed temperature unstable or malfunction:
- Causes: Sensor circuit interfered; poor connection; binding with other power cords; circuit damage.
- Solutions: Separate sensor from power cord or replace shielded wire; check if connecting terminal is tightened.
Unusual difference between real temp. and displayed temp.:
- Causes: Sensor installed incorrectly; sensor line too long causing high resistance; poor connection; sensor damage.
- Solutions: Install sensors correctly; increase cross-section of extension wire; ensure sealing property of connecting wires, water, and moisture proofing; replace sensor.
Cannot shut down after reaching set temperature:
- Causes: Sensor installed incorrectly, unable to measure value correctly; contactor of compressor defective.
- Solutions: Check if sensor measures temperature correctly; replace contactor of compressor.
Relay works too frequently:
- Causes: Temp. return difference set too small or incorrect settings for pressure protector.
- Solutions: Increase temp. return difference values; adjust pressure protector settings.
With "E1" displayed:
- Causes: Sensor line open or short circuit.
- Solutions: Check connection between sensor wiring and coupling end.

Installation Requirements:

Ensure power supply voltage meets the instrument's requirements (deviation less than ±10%).
Keep the sensor away from the power cable.
Strictly distinguish interfaces for the sensor, power cable, and relay output.

General Attention:

Read the manual carefully and follow instructions.
Connect input/output plugs of power and sensor to corresponding sockets according to the wiring diagram. Tighten all screws of connection plugs before connecting power. Incorrect wiring can lead to damage.
Keep the product away from moisture, corrosive air, and high magnetic fields to ensure normal operation.
All products undergo strict quality inspections. A one-year warranty is provided, limited to the product itself. The company is not responsible for other joint and several liabilities.
The warranty does not cover damages caused by unsafe environment, exceeding allowable load, disassembly, or modification by the user.
The warranty certificate is crucial for quality assurance. Any unauthorized changes, damages, scratches, or loss of the certificate will void warranty service.

EWELLY EW-988TK Specifications

General

Brand	EWELLY
Model	EW-988TK
Category	Controller
Language	English