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MVHR controls


Marvin

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This is what my system controls would look like if I didn't have a computerised home automation system:

 

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Wait a minute,  I haven't got a computerised home automation system!

 

 

 

 

 

  • Haha 2

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But you do have the satisfaction of knowing where every wire goes and what the function of each relay, switch , or timer is.

?

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Why does MVHR need complex control or even coupling to home automation.  It's supposed to run at a constant flow 24/7, except when on boost?

 

My option is you are making thing complex for the sake of it.

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Hi @JohnMo

 

Your comment: Why does MVHR need complex control or even coupling to home automation. 

     

My opinion: An MVHR system doesn't have to have complex controls or coupling to home automation.

HOWEVER, several issues have arisen with different parts of the building and these controls have been introduced over the last 4 years to overcome these, and also the control of water coils added to the ducts due to the lack of emitter (radiator) area required for the ASHP to function properly.

 

Your question: It's supposed to run at a constant flow 24/7, except when on boost?

 

My opinion: Your quite right. In fact if there isn't a constant flow of air through the system this can cause problems.

HOWEVER, when required to boost (due to a humid shower room, or heavy cooking smells in the kitchen, or even after the loo has been used) this options speeds up the air flow to the whole building not just the effected areas. 

 

Your thought: My option is you are making things complex for the sake of it.

 

My comment: Have you been talking to my wife?

Actually there are valid reasons due to this building, its location and its use, as to why we wanted more controls. The main issues were heating and cooling requirements caused by solar gain because the windows are all east and west and the supply of either heating and cooling to combat the problems. Even if I was not able to add the controls I absolutely feel that a  normal MVHR system is far better than no MVHR at all.

 

And finally, I see in more expensive and more recent models that several of the problems are already integrated into the system. We bought a very basic model.

 

Good luck

 

M

 

 

 

 

 

 

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4 hours ago, ProDave said:

Just make sure you document it all so the next person has a chance of understanding it.

At least they will not be able to complain to me as I will be dead.

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2 hours ago, Marvin said:

At least they will not be able to complain to me as I will be dead.

A man that takes a problem and claims there is no problem is a woman.

 

A man that takes a problem and complicates it so it's a problem for another man is a CHAMPION!

 

The said 2nd man needs to man up .

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2 hours ago, Marvin said:

I see in more expensive and more recent models that several of the problems are already integrated into the system

I want one of those.  I work with people that make a simple job difficult.

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This is what my MVHR control looks like

(sensor.mvhr_boost_request is set true when the Hob is on, the showers are running, or a triple click on a bathroom light-switch indicates a big one has dropped)


 

Quote

 

alias: Set MVHR Speed
description: ''
trigger:
  - platform: state
    entity_id: sensor.mvhr_boost_request
  - platform: state
    entity_id: sensor.all_out
  - platform: state
    entity_id: sensor.night
  - platform: state
    entity_id: sensor.at_home
condition: []
action:
  - service: fan.set_speed
    target:
      entity_id: fan.comfoairq
    data:
      speed: |
        {% if is_state('sensor.mvhr_boost_request', 'On') %}
          high
        {% elif is_state('sensor.at_home', 'Off') %}
          off
        {% elif is_state('sensor.night', 'On') %}
          low
        {% else %}
          medium
        {% endif %}
mode: restart

 

 

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7 minutes ago, joth said:

triple click on a bathroom light-switch indicates a big one has dropped

 

All that automation and you have to press a button? I was expecting a rim mounted break-beam detector or something... ?

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19 minutes ago, MJNewton said:

rim mounted break-beam detector

Still illegal down here. Sometimes I feel we are living in the dark ages.

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24 minutes ago, MJNewton said:

 

All that automation and you have to press a button? I was expecting a rim mounted break-beam detector or something... ?

I reckon that can be made....

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31 minutes ago, pocster said:

I reckon that can be made....

I’m not volunteering to adjust it

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Just now, markc said:

I’m not volunteering to adjust it

Tbh I looked at a way of boosting the mvhr when a ? is done . I have a manifold of manifolds so everything has its own pipework for water feed . Therefore in theory a “ flow sensor “ on the the toilet cistern pipework could trigger the mvhr boost . But I have a million much more fun / destructive HA things to implement at the moment.

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1 hour ago, pocster said:

Tbh I looked at a way of boosting the mvhr when a ? is done . I have a manifold of manifolds so everything has its own pipework for water feed . Therefore in theory a “ flow sensor “ on the the toilet cistern pipework could trigger the mvhr boost . But I have a million much more fun / destructive HA things to implement at the moment.

Yes I bought a flow sensor but that went off every time you have a weeee.

 

We have now resorted to a non latching pullswitch by the side of each loo with a time delayed relay to turn it off again.

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5 hours ago, Marvin said:

And finally, I see in more expensive and more recent models that several of the problems are already integrated into the system. We bought a very basic model.

 

What I meant was, more recent models that already solve these problems.

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12 minutes ago, Marvin said:

Yes I bought a flow sensor but that went off every time you have a weeee.

 

We have now resorted to a non latching pullswitch by the side of each loo with a time delayed relay to turn it off again.

Can it not differentiate between a big flush and little flush ??

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1 minute ago, pocster said:

I’m none the wiser . Is a big job bigger than a proper job ? 

Who knows, I am a good Methodist.

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37 minutes ago, pocster said:

Can it not differentiate between a big flush and little flush ??

Not without measuring the Bowl contents

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9 minutes ago, Marvin said:

Not without measuring the Bowl contents

I see . Thought maybe it could measure the flow rate in the pipe over a period of time . Other than that install cctv in bathroom and set a ‘trigger’ zone over the pan . As a bonus get some nice footage 

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1 minute ago, pocster said:

I see . Thought maybe it could measure the flow rate in the pipe over a period of time . Other than that install cctv in bathroom and set a ‘trigger’ zone over the pan . As a bonus get some nice footage 

Haven't you got anything better to do???

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