Help with Humidistat

[liverpoolimp]

Hi, I've had an AirTech extractor fan fitted but am struggling with the set up. I've adjusted the humidity setting so that it switched on at an appropriate point (if I make it a fraction less sensitive it won't come on when we need it to), however now it won't switch off. It's cleared the condensation and the room is well ventilated, so seems to be back to similar humidity to when it was previously in the off state.

I've set the timer to the minimum, so that the unit should switch of quickly, once humidity drops but instead it is now 'pulsing'. It is mostly on but then switched off briefly (couple of seconds) and then comes back on again. It is running like this for hours on end.

Does this sound like a fault with the unit, or am I missing something.

Thanks

 

[Avo Mk8]

Hi, I've had an AirTech extractor fan fitted but am struggling with the set up. I've adjusted the humidity setting so that it switched on at an appropriate point (if I make it a fraction less sensitive it won't come on when we need it to), however now it won't switch off. It's cleared the condensation and the room is well ventilated, so seems to be back to similar humidity to when it was previously in the off state.

I've set the timer to the minimum, so that the unit should switch of quickly, once humidity drops but instead it is now 'pulsing'. It is mostly on but then switched off briefly (couple of seconds) and then comes back on again. It is running like this for hours on end.

Does this sound like a fault with the unit, or am I missing something.

Thanks

Please could you tell us the model number of the fan you have?
I see some AirTech fans are designed to run continuously, but increase their airflow when humidity is above set point. Is that the case for yours? There also seem to be different user selectable settings for the room type?
I would have thought the timer should be set to give adequate time to clear worst case humidity, say 15 to 20 minutes, or possibly longer.

It could be faulty, or it could be the settings, a quirk of the install, or room layout.
I don't know why it's running for hours on end. Surely worth talking to the manufacturer?

You say the room is well ventilated - does that translate into an adequate supply of fresh air when the fan is running, ie a gap under the door, or a vent to outside, such that extraction is effective, and the fan not throttled by the lack of air entering the room.

 

[liverpoolimp]

Please could you tell us the model number of the fan you have?
I see some AirTech fans are designed to run continuously, but increase their airflow when humidity is above set point. Is that the case for yours? There also seem to be different user selectable settings for the room type?
I would have thought the timer should be set to give adequate time to clear worst case humidity, say 15 to 20 minutes, or possibly longer.

It could be faulty, or it could be the settings, a quirk of the install, or room layout.
I don't know why it's running for hours on end. Surely worth talking to the manufacturer?

You say the room is well ventilated - does that translate into an adequate supply of fresh air when the fan is running, ie a gap under the door, or a vent to outside, such that extraction is effective, and the fan not throttled by the lack of air entering the room.

Thanks for your response. The unit is an AirTech VF-W6GP - I haven't been able to find a manual or other documents online, so that's all I know. It is installed in a kitchen and really only needs to come on when we cook on the hob - this causes notable condensation on windows. The room is ventilated by a trickle vent in a window and there are no doors, so it is open to the rest of the house.

The settings are two screws one for humidity and one for the timer - my understanding is the timer determines how long the fan runs once the humidity drops below the trigger point, hence I've set it to minimum at least whilst I get the tigger point right.

I've currently switched it off at the isolator switch and am manually switching it on when we cook. It runs continuously until the condensation visibly clears and then goes back to this pattern of running for a couple of minutes before stopping momentarily and running again.

 

[Avo Mk8]

Thanks for your response. The unit is an AirTech VF-W6GP - I haven't been able to find a manual or other documents online, so that's all I know. It is installed in a kitchen and really only needs to come on when we cook on the hob - this causes notable condensation on windows. The room is ventilated by a trickle vent in a window and there are no doors, so it is open to the rest of the house.

The settings are two screws one for humidity and one for the timer - my understanding is the timer determines how long the fan runs once the humidity drops below the trigger point, hence I've set it to minimum at least whilst I get the tigger point right.

I've currently switched it off at the isolator switch and am manually switching it on when we cook. It runs continuously until the condensation visibly clears and then goes back to this pattern of running for a couple of minutes before stopping momentarily and running again.

I see what you mean about lack of information!

I found one AirTech extractor which said the timer range was between 3 and 20 minutes - not sure if that applies to yours - from your description it sounds as if the minimum timer setting is about that.
If you wind the timer up a little, does it continue to stop/run/stop/run etc, but with longer running time, and/or does it eventually stop?
My limited experience with humidity sensors (admittedly a long time ago) was they took a little while to respond).

It does sound incorrect behaviour.
The fan seems to be a Chinese product - nothing necessarily wrong with that, but I suspect technical support is difficult to find.

Sorry I can't help, maybe others here have some sugestions