How to connect the electromechanical timer ABB AT3-R with the temperature relay RT-820M?

Hello. How to correctly connect the ABB AT3-R timer and the RT-820M temperature relay with the pool circulation pump, so that the pump switches on both in time and when the water temperature drops to the set value, but what is the priority in priority? The circuit also has a coolant circulation pump and an electromagnetic valve.

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5 comments

  • Admin

    Hello! You need to connect in parallel to each other. The simplest option - regardless of the state of the first apparatus, the second will supply power to the pump and vice versa. The main thing is to check that the “zero” does not appear at the output in the off state if you break the phase.

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  • Admin

    In this case, power will be supplied until both devices turn off (timer and temperature). For a more detailed answer you need to see the scheme.

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  • Gregory

    Schemes in the attachment

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  • Gregory

    Timer circuit

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    • Admin

      You wrote: Hello. On the issue of December 5, 2018. When the timer and the temperature switch are connected in parallel, when the voltage is applied to the timer, the coolant circulation pump and the solenoid valve also turn on. And this should only happen when voltage is applied to the temperature switch. How to connect? There are two circuit breakers in the circuit, a timer, a timer, an e-mag. valve, coolant circulation pump and pool circulation pump. The task, when applying voltage to the timer and time relay at the same time, both pumps and the valve are turned on only if the temperature is lower than the set one. When the set temperature is reached, everything is de-energized, except for the pool pump, if the operating mode is currently set on the timer. If the timer at this moment sets the time to turn off the pool pump, then it naturally also turns off. Etc. At the set time, only the pool pump works, but when the temperature drops below the set temperature, the whole circuit turns on: two pumps and an e-mag. valve.
      Here is the answer:
      It turns out that we have 1 condition: when cooling, turn on the coolant pump (NT), the solenoid valve and the circulation pump. In this case, condition 2: if the operating time of the circulation pump (SC) is on the schedule, then it needs to turn on. These two conditions should work independently. It means that it is impossible to combine the power circuits of the SC and NT. Therefore, we take 3 relays:
      1 - controls the coolant pump and the EM VALVE when applying the phase from the temperature switch, we have a constant zero.
      2 - turns on the circulation pump when applying the phase from the temperature switch, we have a constant zero.
      3 - turns on the circulation pump but already when ZERO is supplied from the timer, and we have the phase directly.

      Then situation 1:
      The temperature relay worked, and according to the timer “not yet time” —-> relays 1 and 2 turn on, everything works.
      Situation 2:
      The temperature is normal, but according to the timer it is time to turn on the circulation pump —-> zero is supplied to relay 3 and it turns on the circulation pump.
      SITUATION 3:
      The temperature relay worked, the timer also worked, and when the temperature returned to normal, then the timer should still work on the timer ——> first a signal is sent to 1 and 2 relays from the temperature relay and from the timer to 3 relays. All inclusive.
      Then the temperature relay, when it is normalized, turns off - 1 and 2 relays are de-energized, and 3 relays continue to be powered by a timer
      By the way, relay 3 can be controlled both by zero and by phase with such a connection scheme. Try this option. The connection diagram is as follows:

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