EWELLY EW-988R Technical manual

parameter.
that you have entered the system setting menu.
a) Under normal operating conditions, press the "SET" key to display the control
temperature.
c) Hold the "▲" or "▼" key to quickly adjust the parameter value.
b) Press the "▲" or "▼" key to adjust the value.
a) Hold “SET”for more than 6s until the parameter code "HC" is displayed, indicating
2. User parameter adjustment method
1. Temperature setting
b) Press the “SET” key to select different parameter values. (The order of parameters is:
HC-LS-HS-Pt-CA-d).
c) Press "SET" and press "▲" or "▼" at the same time to adjust the value of a specific
d) Under setting state, if there is no key operation within 6s, it will automatically return
to the normal operation state.
2.Output Relay: 2-off 10A/220VAC
3.Power Consumption：≤3W
1.Operating Voltage：220VAC±10％; 50HZ/60HZ
4.Working Environment：-10 ～50 ；RH≤90％ ℃ ℃
9.Installation method: Rail mounting
8.Overall Dimension：72（W）× 54（H）× 88（D）mm;
5.Control Range：-19.9℃～99.9℃
6.Resolution：0.1℃；Accuracy：±0.5℃
7.Input Signal：2-Off 20K NTC sensors，standard cable length: 2m
Sepcification
Display panel
Operation Instruction
Version：
EW 988R -
1.Please make sure that the power supply voltage meets the required voltage of the
instrument. The deviation should be less than ±10％.
Installation Requirement
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.
Heating indicator
To display set temp. Single
Press
Single
press Quickly adjust the value
Hold
Single
press
Hold for 6s
Two hand
operation
+
+
Heating
Cooling
Wiring diagram
EW-988R microcomputer electronic thermostat adopts rail mounting design, with
cooling, heating and temperature control hysteresis modes, and also has functions
such as adjustable compressor delay protection time, temperature correction,
temperature upper and lower limits, and automatic fault alarm. It is high-precision,
with strong versatility, stable performance, suitable for various refrigeration and
heating projects.
Running indicator
Cooling indicator
Current temperature
Up and down key

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3. All our products have passed strict quality inspections before leaving factory. We
provide one-year warranty for this product, which is limited to product itself and our
company is not responsible for any other joint and several liability.
If the product includes but not limited to the following damages caused by being
used and installed in unsafe environment, being connected to the load exceeds the
allowable range of the product, being disassembled and modified by the user, etc.
Our company will not provide replacement or maintenance service within the
warranty period. Meanwhile, we will not be liable for any direct or indirect damages
caused.
Attention
2. Keep this product from away moisture, corrosive air and high magnetic field.
Otherwise, the normal operation of this product will be affected.
1.Please read this manual carefully and follow the instructions while using the
product. Connect input/output plugs of power & sensor to the corresponding
sockets by following wiring diagram strictly. Tighten all the screws of connection
plugs, then connect the power afterwards. Otherwise, it may affect the usage and
control, and even result in damage in parts.
The warranty certificate on the product is an important evidence for our product
quality assurance. Any changes without authorization, damages, scratches and lose
on the certificate, our company will not provide any replacement or maintenance
service for these products.
Official Website
Parameter table
b) When the current temperature ≤ set temperature, the load relay is disconnected,
2. Heating control
the set “time delay (Pt)” is reached, the load relay is closed and system starts
b) When the current temperature ≥ set temperature, the load relay is disconnected and
Function description
1. Cooling control
The heating and cooling mode can be selected in the parameter HC, H is for heating, C
is for cooling.
a) When the current temperature ≥ set temperature + temperature hysteresis (d) and
the set “time delay (Pt)” is reached, the load relay is closed and system starts
cooling.
and the refrigeration stops.
a) When the current temperature ≤ set temperature - temperature hysteresis (d) and
heating.
the heating stops.
a) The set temperature upper limit (HS) value should be greater than the set
temperature
plus temperature control hysteresis.
b) The set temperature lower limit (LS) value should be smaller than the set
temperature
c) When the alarm occurs, the alarm relay will be closed and the load relay will be
minus temperature control hysteresis.
disconnected.
Note：
Fault handling
When the real temperature is lower than the set LS value, it will
display “LL”
When the real temperature is higher than the set HS value, it will
display “HH”
When the sensor is open or short-circuited it will display “E1” ,
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