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Digital Thermostat
with Relay Control + Heating and Cooling Modes & Hysteresis
This listing is for a programmable digital thermostat with relay control and cooling/heating modes. I do my best to give you a solid demonstration in the video above, but I'll admit that I stutter through some of it. Please refer to the video as the primary manual. When you power this device up, it will show you the current temperature, assuming that there is no offset programmed. If you want, you can compare the temperature with a house thermometer to compare, and if you see a discrepancy, you can use the P4 setting (Temperature Correction) to make an adjustment. If you press the SET button (left button) it will show you the reference temperature. This reference temperature can be changed by pressing the + or - buttons. This reference temperature will work with the Hysteresis setting (P1) to determine what temperature the relay will turn on and off at. In the video, I leave the reference temperature at 25 degrees. The temperature sensor on the wire extension is waterproof. I'll give an example in a minute. Settings are saved after power off to internal EEPROM memory, but can be changed at any time.
To Operate:
Hold down the SET button for 5 seconds until you are able to change the programming mode from P0-P5. You can increment or decrement which mode you want to make an adjustment to by pressing the + and - buttons. When you've selected the mode you want to program, press the SEL button again to make an adjustment. If you take too long, the device will bring you back into temperature readout mode.
Select P0 to determine if you want Cooling or Heating mode. In heating mode, the relay will turn on if the temperature in the room goes below the reference temperature (and works with the hysteresis setting (We'll get to this in a minute). In cooling mode, the relay will turn on if the temperature in the room goes above the reference setting (And works with the hysteresis setting). Choose your mode, and go to P1.
Select P1 to select your hysteresis setting. The factory setting is 2x degrees, but it can be changed to anywhere between 1-15 degrees C. Let's leave this at a value of 2 degrees for the example below.
Example#1 - Cooling Mode With Hysteresis Set At 2 & Reference Temperature Set To 25 Degrees / P5 Setting at 0:
The relay will turn on when the temperature in the room goes above 25 degrees. The relay will turn off when the temperature goes down below 23 degrees. The reference temperature is 25 degrees (Relay On) - Relay will turn off at reference temperature - hysteresis value (25 degrees ref - 2 degrees hysteresis = 23 degrees).
Example#2 - Heating Mode With Hysteresis Set At 2 & Reference Temperature Set To 25 Degrees / P5 Setting at 0:
The relay will turn on when the temperature in the room is below 27 degrees, at which point the relay will turn off (25 degrees ref + 2 degrees hysteresis setting). The relay will turn back on when the temperature goes down below 25 degrees (reference temperature).
The P2/3 Settings don't need to be used. They are the minimum and highest temperature setting limits. I suggest you leave them at the default factory settings of -50/110 degrees C. Settings are saved after power off to internal EEPROM memory, but can be changed at any time.
The P4 setting allows for you to offset the current temperature, and can be changed to add up to 7 degrees offset down to a -7 degrees of offset. This is in case you need to calibrate. If you suspect that there is a differential of more than 2 degrees relative to the actual temperature, take a thermometer and determine the difference. If the digital readout says 16 degrees, but you determine that the temperature is actually 18 degrees, enter P4 mode, and set to (2). 16 degrees + 2 degrees offset = 18 degrees. Go back to the temperature readout and it should be 18 degrees. Another example... If your readout says 18 degrees, but you determine that it is actually 15 degrees in the room, set the P4 value to -3 (18 degrees readout - 3 degrees offset = 15 degrees new readout). Settings are saved after power off to internal EEPROM memory, but can be changed at any time.
The P5 setting allows for you to delay the start-up/relay turn on time. The factory setting is 0 minutes. You can change this to between 0-7 minutes. If you use the P5 setting to change this to anywhere from 1-7 minutes, then it will take that time upon power up for the system to act as it should relative to relay activation. As well, when the relay state turns off, and is supposed to turn on again, there is another delay. Only use this mode if you really don't want the relay to turn on immediately during power on. Settings are saved after power off to internal EEPROM memory, but can be changed at any time.
The board has four ports with screw terminals:
+12v : 12VDC should be applied here to power the board.
GND: DC Supply Ground
K1/K0: When the relay is turned on, these contacts connect to one another as a high power switch. These are the two available relay outputs. When the relay is off there is no connection between these leads.
Further specifications are listed below. If you have any additional questions, I will be happy to answer!
Programmable Settings:
Code Code Description Setting range Factory setting
P0 Cooling / heating C / H C
P1 Hysteresis setting 1-15 2
P2 The minimum set -50 -50
P3 Highest setting on the limit 110 110
P4 Temperature correction -7 To 7 degrees 0
P5 Delay start time 0-7 minutes 0
Specifications:
Temperature control range: -50 to 110 ° C
Resolution: 1 ℃ -9.9 99.9 0.1 ℃ temperature
Temperature measurement accuracy: ± 1 ℃
Refresh rate: 1S
Input power: DC12 V ± 10%
Measurement input: NTC (10K 0.5% ) waterproof sensor
Output: 1 relay output capacity 220V5A 125 V10A 1 4V to 20 A
Environmental requirements: -10 to 60 ° C Humidity 20% -85%
Size: 75 * 60mm (mounting holes M3.5 angle 84mm)
Power consumption: Static current: ≤ 30mA pull current: ≤ 75MA
To Operate:
Hold down the SET button for 5 seconds until you are able to change the programming mode from P0-P5. You can increment or decrement which mode you want to make an adjustment to by pressing the + and - buttons. When you've selected the mode you want to program, press the SEL button again to make an adjustment. If you take too long, the device will bring you back into temperature readout mode.
Select P0 to determine if you want Cooling or Heating mode. In heating mode, the relay will turn on if the temperature in the room goes below the reference temperature (and works with the hysteresis setting (We'll get to this in a minute). In cooling mode, the relay will turn on if the temperature in the room goes above the reference setting (And works with the hysteresis setting). Choose your mode, and go to P1.
Select P1 to select your hysteresis setting. The factory setting is 2x degrees, but it can be changed to anywhere between 1-15 degrees C. Let's leave this at a value of 2 degrees for the example below.
Example#1 - Cooling Mode With Hysteresis Set At 2 & Reference Temperature Set To 25 Degrees / P5 Setting at 0:
The relay will turn on when the temperature in the room goes above 25 degrees. The relay will turn off when the temperature goes down below 23 degrees. The reference temperature is 25 degrees (Relay On) - Relay will turn off at reference temperature - hysteresis value (25 degrees ref - 2 degrees hysteresis = 23 degrees).
Example#2 - Heating Mode With Hysteresis Set At 2 & Reference Temperature Set To 25 Degrees / P5 Setting at 0:
The relay will turn on when the temperature in the room is below 27 degrees, at which point the relay will turn off (25 degrees ref + 2 degrees hysteresis setting). The relay will turn back on when the temperature goes down below 25 degrees (reference temperature).
The P2/3 Settings don't need to be used. They are the minimum and highest temperature setting limits. I suggest you leave them at the default factory settings of -50/110 degrees C. Settings are saved after power off to internal EEPROM memory, but can be changed at any time.
The P4 setting allows for you to offset the current temperature, and can be changed to add up to 7 degrees offset down to a -7 degrees of offset. This is in case you need to calibrate. If you suspect that there is a differential of more than 2 degrees relative to the actual temperature, take a thermometer and determine the difference. If the digital readout says 16 degrees, but you determine that the temperature is actually 18 degrees, enter P4 mode, and set to (2). 16 degrees + 2 degrees offset = 18 degrees. Go back to the temperature readout and it should be 18 degrees. Another example... If your readout says 18 degrees, but you determine that it is actually 15 degrees in the room, set the P4 value to -3 (18 degrees readout - 3 degrees offset = 15 degrees new readout). Settings are saved after power off to internal EEPROM memory, but can be changed at any time.
The P5 setting allows for you to delay the start-up/relay turn on time. The factory setting is 0 minutes. You can change this to between 0-7 minutes. If you use the P5 setting to change this to anywhere from 1-7 minutes, then it will take that time upon power up for the system to act as it should relative to relay activation. As well, when the relay state turns off, and is supposed to turn on again, there is another delay. Only use this mode if you really don't want the relay to turn on immediately during power on. Settings are saved after power off to internal EEPROM memory, but can be changed at any time.
The board has four ports with screw terminals:
+12v : 12VDC should be applied here to power the board.
GND: DC Supply Ground
K1/K0: When the relay is turned on, these contacts connect to one another as a high power switch. These are the two available relay outputs. When the relay is off there is no connection between these leads.
Further specifications are listed below. If you have any additional questions, I will be happy to answer!
Programmable Settings:
Code Code Description Setting range Factory setting
P0 Cooling / heating C / H C
P1 Hysteresis setting 1-15 2
P2 The minimum set -50 -50
P3 Highest setting on the limit 110 110
P4 Temperature correction -7 To 7 degrees 0
P5 Delay start time 0-7 minutes 0
Specifications:
Temperature control range: -50 to 110 ° C
Resolution: 1 ℃ -9.9 99.9 0.1 ℃ temperature
Temperature measurement accuracy: ± 1 ℃
Refresh rate: 1S
Input power: DC12 V ± 10%
Measurement input: NTC (10K 0.5% ) waterproof sensor
Output: 1 relay output capacity 220V5A 125 V10A 1 4V to 20 A
Environmental requirements: -10 to 60 ° C Humidity 20% -85%
Size: 75 * 60mm (mounting holes M3.5 angle 84mm)
Power consumption: Static current: ≤ 30mA pull current: ≤ 75MA