EWELLY EW-802 Directions

Microcomputer Thermostat Serial
《
EW-802 Directions
This product is mainly used in solar water heater equipment, the use of
the temperature difference and temperature to control the output.
This product has three output controls. One way to control the temper-
ature difference between the two temperature zones. When the temperature
difference reaches the set value, the water pump cycle is automatically
operated to balance the temperature in the two temperature zones. The second
way controls electric heating. When the solar heating fails to exceed the
heating temperature difference of the set temperature, the electric heating
system automatically starts heating to the set temperature and automatically
thermostats within the temperature difference control range. The third way to
control the water valve, automatically add water and automatically stop adding
water when there is water shortage.。

Technical Specifications

：AC220V ±10％ 50HZ/60HZ
1. Operating voltage
：5A/220V/AC
2. Output Load
：≤3W
3. Power Consumption
：-10℃～50℃ RH≤90％
4. Working environment
5. Control of heating：2℃～99℃
6. Control of thermal start- up：3℃～50℃
7. Resolution：1℃ Accuracy：±1℃
nput signal:
8. I two-ways sensors，20KX1.5mX2
O ne water level probe
：72(L)×
9. Overall Dimension
10. Rail mounting

Panel Diagram

Circulating pump
Heating load indication
Water
valve
Ewelly
EW-MH802
●
I n non-setting state, press
in the high temperature zone.
● In the non-setting state, hold
and the factory parameters will be restored.

Demand of install

1.The voltage must accord with controller's demand.
The voltage's deviation is no more than ±10%.
2.The loop of sensor is possible to keep away from the
loop of power.
3.Differentiate sensors, power lines, and output relays.
》
。
54 (H)× 88 (D)mm
Low temperature zone
temperature
to check the current temperature
6 seconds, the display will flash
版 本：802.18.11.01

Brief on Controlling Procedure

1. Low temperature zone temperature settings: Press
temperature of low temperature zone, press
controlling temperature. Without pressing any key when finished operating，it
will automatic save memory setting parameters after six seconds.
2.Parameter setting: Holding
the corresponding indicator flashes, more than once every press
next function indicators, then press
each function. Without pressing any key when finish operation, it will
automatic save memory setting parameters after six seconds.
Start-up temperature difference
Ewelly
EW-MH106
Temperature difference of the pump stopped
Ewelly
EW-MH106
Heating temperature difference
Ewelly
EW-MH106
Temperature difference
Ewelly
EW-MH106
High temperature zone temperature correction
Ewelly Ewelly
EW-MH106 EW-MH106
Low temperature zone temperature correction
Ewelly
EW-MH106
Sensor error self-test function
Ewelly
EW-MH106
Ewelly
EW-MH106
Ewelly
EW-MH106
displays the
or to change the
and after six seconds to enter Setup,
to run the
or to change the parameters for
When two temperature sensor detects a
temperature of two zones, the difference is
greater than the value of the temperature
difference between the set start value, the
circulation pump relay ON, temperature
difference setting range: temperature of
the pump stopped+1 ℃ ~ 50 ℃.
When the temperature difference between
the two sensors is less than this value, the
circulation pump stops.
Range 1 ℃ ~ started temperature difference-1 ℃
Note: When difference of the pump stops setting "0",
once the circulation pump relay ON, circulation
pump not stopped.。
High temperature zone must be higher
than the setting temperature difference.
Equal or less than this value automatically
start heating control. Heating temperature
range:0℃～20℃。
When the set temperature is reached,
the heating is stopped, and the
difference between the electric heating
is restarted after the temperature is
back. Temperature hysteresis setting
range: 1 °C ~ 20 °C.
When the thermostat detects the
temperature of the high temperature
zone and the actual value error, this
feature can be amended. Correction
range: -10 ℃ ~ 10 ℃.
When the thermostat detects the
temperature of the low temperature
zone and the actual value error, this
feature can be amended. Correction
range: -10 ℃ ~ 10 ℃.
The "EH" symbol is displayed when
the high temperature zone sensor is
opened. The "heating" relay is
disconnected, the "pump" relay is
energized, and the "pump" indicator is
illuminated.
The "EH" symbol is displayed when
thelow temperature zone sensor is
opened. The "heating" relay is
disconnected, the "pump" relay is
energized, and the "pump" indicator is
illuminated.
When the water level is lower than the low
water level value, the "LL" symbol is
displayed alternately with the low
temperature zone temperature, while the
"watering valve" relay is sucked and added
with water; the "heating" relay and the
"water pump" relay are disconnected.