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How to set the Salus receiver to work with the regulator - auto or manual?

Kosdere 53913 16
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How should a Salus receiver be set to work with a room regulator: AUTO or MANUAL, and what is the difference?

Set it to AUTO; MANUAL keeps the circuit permanently closed and ignores the room regulator, while AUTO makes the receiver switch only according to the regulator signal [#18439064][#18441503][#18442005] In AUTO, when the thermostat calls for heat, the green LED on the receiver lights, the contact closes, and the boiler heats; when the thermostat stops calling, the contact opens and heating stops [#18441503] If the boiler or pump behaves incorrectly in AUTO, the issue is not the AUTO/MANUAL setting itself but the wiring or boiler settings, which should be checked against the manual or by a specialist [#18441503][#18441662]
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  • #1 18438974
    Kosdere
    Level 5  
    Posts: 5
    Rate: 7
    Hello, could someone explain to me how the receiver should be set to cooperate with the regulator? Car or manual? How is it different? How to set the Salus receiver to work with the regulator - auto or manual?
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  • #2 18439064
    Nargo
    Level 23  
    Posts: 495
    Help: 45
    Rate: 202
    AUTO - switches the room controller
    MANUAL - Enabled regardless of the status of the room controller
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  • #3 18439619
    Kosdere
    Level 5  
    Posts: 5
    Rate: 7
    Nargo wrote:
    AUTO - switches the room controller
    MANUAL - Enabled regardless of the status of the room controller


    So it must be on the car and I want to control the heating via the controller?
  • #4 18439640
    ROWE
    Level 34  
    Posts: 1987
    Help: 239
    Rate: 529
    Kosdere wrote:
    Hello, could someone explain to me how the receiver should be set to cooperate with the regulator?

    Whether it is auto or manual, it will always work in accordance with the regulator, only with the difference described in #2.
    The rest of the details are in the manual, its.
  • #5 18441294
    Kosdere
    Level 5  
    Posts: 5
    Rate: 7
    I have it set like this

    How to set the Salus receiver to work with the regulator - auto or manual?

    When switching to auto mode, the boiler runs without a pump, so it doesn`t work as it should? I wonder if I have something wrong because the temperature shown on the controller screen does not match the one I set the controller to. Cool radiators, not cold, still don`t go down to 21C, and I have the economy one at 7pm.
  • #6 18441503
    BUCKS
    Level 39  
    Posts: 3820
    Help: 536
    Rate: 1084
    Kosdere wrote:
    I have it set like this

    that is, bad.
    The MANUAL setting means that the circuit is permanently closed, just like if you had a permanently closed jumper on the boiler and the receiver does not respond to signals from the room regulator (transmitter).
    Only the AUTO setting causes the receiver to respond to signals from the transmitter.
    If you prefer MANUAL mode, why did you buy the controller? What you have set up makes no sense.

    Kosdere wrote:
    When switching to auto mode, the boiler runs without a pump, so it doesn`t work as it should?

    In AUTO mode, if the transmitter, i.e. the room regulator, gives a heating signal, the green diode on the receiver will light up, the circuit will be closed and the boiler will turn on the heating.
    If the transmitter gives the HEATING STOP signal, the green diode on the receiver will turn off, the circuit will be opened and the boiler will turn off the heating.
    The operation of the pump after the burner is turned off depends on the so-called settings. pump overrun in the boiler settings.
    When a specialist connected this Salus to you, the specialist should have set it up on the boiler or told you what to set it up and how, and if you did it yourself, now you have to set everything up yourself.
  • #7 18441641
    ls_77
    Level 38  
    Posts: 2439
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    Maybe the changeover contact in the receiver is connected the other way around and instead of providing a "jumper", it "opens" and the boiler does not turn on and vice versa.
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  • #8 18441662
    ROWE
    Level 34  
    Posts: 1987
    Help: 239
    Rate: 529
    Kosdere wrote:
    When switching to auto mode, the boiler runs without a pump, so it doesn`t work as it should?

    This qualifies for proper reconnection by a specialist, according to the instructions, also mentioned in #6, 7.
  • #9 18441742
    BUCKS
    Level 39  
    Posts: 3820
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    Rate: 1084
    ls_77 wrote:
    Maybe the changeover contact in the receiver is connected the other way around and instead of providing a "jumper", it "opens" and the boiler does not turn on and vice versa.

    ROWE wrote:
    This qualifies for proper reconnection by a specialist, according to the instructions, also mentioned in # 6, 7.

    I have RT510RF and in the receiver I have COM and NO connectors, so I do not have the NC option to connect the receiver incorrectly.
    I also ruled out incorrect connection of the receiver, because there is nothing to damage there ;)
  • #10 18441888
    ROWE
    Level 34  
    Posts: 1987
    Help: 239
    Rate: 529
    How to set the Salus receiver to work with the regulator - auto or manual? Well, it`s as simple as pie, but if you want to have a pump and a solo boiler, you need to connect a relay and a coil for 230 V/AC.
  • #11 18441955
    BUCKS
    Level 39  
    Posts: 3820
    Help: 536
    Rate: 1084
    ROWE wrote:
    If there is to be a pump and a boiler, a relay must be connected.

    If you have a gas boiler, the pump is built into the boiler, so the regulator turns on the boiler and the built-in pump automatically, so an additional relay is unnecessary and I installed this variant.
    The question was how the receiver should be set to AUTO or MANUAL, the answer is AUTO.
    For people who know the basics of the subject, this connection is simple, and if someone has no idea about it, they should not attempt it at all.
  • #12 18442005
    ROWE
    Level 34  
    Posts: 1987
    Help: 239
    Rate: 529
    The author has drawn it in two versions so as not to split it up, also for other interested parties.
    The answer is always auto (OFF/ON with the Salus regulator), the control applies to the upper diagram (to be precise).
    This is the position of the receiver switches:
    1. HE
    2. AUTO
  • #13 20343229
    boruurob
    Level 12  
    Posts: 229
    Rate: 97
    I`ll join in on the topic. I have a floor installation with several circuits that are turned on/off with Salusa T30NO actuators. The actuators are controlled by a set of 091FLRFV2 wireless regulators with an RXRT510 receiver.
    As this year I launched a heat pump with new underfloor heating circuits, I would like to test the underfloor heating without cutting off the circuits. I thought that the force T30NO - Normally Open - after disconnecting the RXRT510 from the power supply, would leave the circuits open, and this NO probably means that they extend, thus closing the underfloor circuits... And they close and close the circuits. Do you have any idea how to keep the actuators in such a position without unscrewing the actuators and without changing the programs in the controllers so that they do not close the underfloor heating loop?
  • #14 20344831
    BUCKS
    Level 39  
    Posts: 3820
    Help: 536
    Rate: 1084
    boruurob wrote:
    I thought that the power of T30NO - Normally Open - after disconnecting the RXRT510 from the power supply, would leave the circuits open, and this NO probably means that they extend, thus closing the underfloor circuits... And they close and close the circuits.

    I don`t know what you have, but I quote the description from the manufacturer`s website:
    Quote:
    NO type actuators are normally open devices, which means that when there is no current, the actuator is in the open position. The status of the actuator can be quickly checked thanks to the indicator element.

    this is the description from the Salus website regarding the T30NO_24V_M30x1_5 actuator.
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  • #15 20362240
    Nargo
    Level 23  
    Posts: 495
    Help: 45
    Rate: 202
    Set the room controller to cooling mode (page 21). The contactor in the receiver will work as NC.
    This means that when the temperature rises above the set value, the controller will start closing the actuator. Below will be opening.
    Attachments:
    • 091FLRFv2_Fullmanual_V0_PL_.pdf (11.99 MB) You must be logged in to download this attachment.
  • #16 20369257
    BUCKS
    Level 39  
    Posts: 3820
    Help: 536
    Rate: 1084
    @Nargo
    it wasn`t about that, but about the fact that the valve is supposedly NO, so with the receiver turned off, @boruurob expected that the heating would work normally, but it doesn`t.
    Either it has an NC valve instead of NO, or maybe the room regulator is in cooling mode instead of heating mode.
    But @boruurob hasn`t written anything since December 19, so we can guess what happened to him.
  • #17 21355403
    jacekmooss
    Level 1  
    Posts: 1
    Question: I have a heat substation and I have installed a Salus RT520RF controller with a RXRT 520 receiver and it has broken down, you can't buy it separately but you can buy the 510 receiver separately (I won't be using the 2 extra A and B contacts to connect the opentherm to the substation unfortunately they are not suitable) and my question is whether the rt520rf will work with the 510 receiver and whether I will lose anything else apart from the A and B contacts, Jacek
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Topic summary

✨ The discussion clarifies the correct setting of the Salus receiver to work with the room regulator, emphasizing that the receiver should be set to AUTO mode for proper operation. In AUTO mode, the receiver responds to signals from the room controller, closing the circuit to activate the boiler and heating system when heating is required, and opening it to stop heating. MANUAL mode keeps the circuit permanently closed, bypassing the regulator signals, which is generally illogical if a controller is used. Issues such as the boiler running without the pump in AUTO mode may indicate incorrect wiring or configuration, including the need for a relay when using a standalone boiler and pump. For gas boilers with built-in pumps, no additional relay is necessary. The receiver switch positions for correct operation are HE and AUTO. Additional discussion covers actuator types (e.g., T30NO) and their behavior when power is disconnected, as well as compatibility questions between Salus RT520RF controllers and RXRT510 receivers. Proper installation and specialist setup are recommended to ensure correct system function.
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FAQ

TL;DR: Set your Salus receiver to AUTO for thermostat control; it has 2 modes. "AUTO - switches the room controller." This FAQ explains setup, wiring, pump behavior, and actuator logic. [Elektroda, Nargo, post #18439064] Why it matters: It prevents wasted energy, cold rooms, and miswiring that disables heating—especially with underfloor loops and pumps. For: DIYers and installers using Salus RT510RF/RT520RF receivers with boilers or underfloor actuators.

Quick Facts

Which setting should I use on a Salus receiver: AUTO or MANUAL?

Use AUTO when you want the room controller to command heating. MANUAL forces heating regardless of the controller. As one expert puts it: "AUTO - switches the room controller." This ensures the thermostat schedules and setpoints actually control the boiler. [Elektroda, Nargo, post #18439064]

Does MANUAL override the thermostat and keep heating on?

Yes. MANUAL closes the circuit permanently, like a fixed jumper at the boiler. The receiver ignores the transmitter. "Only the AUTO setting causes the receiver to respond" to thermostat calls, including the green LED heat-demand indication. [Elektroda, BUCKS, post #18441503]

In AUTO my boiler fires but the pump stays off. What should I check?

Confirm the receiver’s green LED is on during heat demand. Verify the boiler’s room-thermostat terminals are wired to COM and NO. Pump run-on and post-purge timings are set in the boiler menu, not the receiver. If unsure, have a specialist review the connection and settings. [Elektroda, BUCKS, post #18441503]

How do I wire an RXRT510 receiver to a boiler thermostat input?

  1. Isolate power. Connect COM and NO from the receiver to the boiler’s room-thermostat terminals.
  2. Set receiver switches to HE and AUTO for heating control.
  3. Restore power and pair the thermostat per the manual, then test a heat call. This gives on/off control as designed. [Elektroda, ROWE, post #18442005]

What do COM and NO mean on RXRT510, and is there an NC option?

COM is the common, and NO is the normally open contact that closes on heat demand. RXRT510 exposes 2 terminals (COM and NO) only; there is no NC on this model, which prevents miswiring to a normally closed contact. [Elektroda, BUCKS, post #18441742]

Could reversed wiring make the boiler turn off when it should be on?

Yes, on receivers with a changeover relay, using the wrong pair can invert the logic. That means it can open when it should close, and vice versa. Always follow the wiring schematic specific to your receiver and boiler. [Elektroda, ls_77, post #18441641]

My radiators are lukewarm and the setpoint isn’t reached—how do I diagnose?

Put the receiver in AUTO. Raise the setpoint and watch for the green LED to light, confirming a heat call. If the LED is on but the boiler stays idle, check boiler thermostat terminals and its pump overrun settings. If the LED stays off, re-pair or relocate the thermostat. [Elektroda, BUCKS, post #18441503]

Do I need a relay to run both a separate pump and a solo boiler?

Yes. For a standalone pump with a non-integrated boiler, drive a 230 V AC coil relay from the receiver. Use the relay contacts to switch the pump and coordinate boiler firing as required by your system diagram. This avoids overloading the receiver and keeps logic clean. [Elektroda, ROWE, post #18441888]

For gas boilers with built‑in pumps, is an extra relay required?

No. The thermostat input on the boiler triggers the burner and the built-in pump automatically. The Salus receiver simply closes the on/off circuit, so an additional relay is unnecessary in this common configuration. [Elektroda, BUCKS, post #18441955]

How can I keep Salus T30NO actuators open to test underfloor loops?

Set the room controller to cooling mode to flip the receiver’s relay to NC behavior. Then manage the setpoint so loops stay open during your test window. "The contactor in the receiver will work as NC" in cooling, inverting open/close logic. [Elektroda, Nargo, post #20362240]

With T30NO actuators, should they open without power?

Yes. “NO type actuators are normally open devices,” so they remain open when unpowered. Use the indicator element to verify the position. If they appear closed without power, recheck the model number and wiring at the manifold. [Elektroda, BUCKS, post #20344831]

My “NO” actuators close when the receiver is off—what’s wrong?

You likely have NC actuators fitted, not NO, or the controller runs in cooling mode, which inverts the relay logic. Confirm actuator type on the label and verify the controller’s operating mode before rewiring anything. [Elektroda, BUCKS, post #20369257]

What are the correct receiver switch positions for thermostat control?

Use HE for heating mode and AUTO for thermostat-driven switching. As noted by an installer, “The answer is always auto,” and the control applies to the standard heating diagram. This ensures demand follows the room controller. [Elektroda, ROWE, post #18442005]

How can I confirm the receiver is actually calling for heat?

Look at the RX receiver’s green LED. It lights when the thermostat calls for heating and extinguishes when the call ends. The boiler should start and stop accordingly; if not, inspect the boiler’s thermostat terminals and settings. [Elektroda, BUCKS, post #18441503]

Will an RT520RF thermostat work with an RXRT510 receiver, and what will I lose?

RXRT510 does not provide the A/B OpenTherm terminals present on the RXRT520. Using it removes OpenTherm capability; it can only switch a basic on/off input. Choose RXRT520 if you need OpenTherm features retained at your substation. [Elektroda, jacekmooss, post #21355403]
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