Author Topic: Automating a whole house exhaust fan  (Read 196 times)

Offline hmspain

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Automating a whole house exhaust fan
« on: August 13, 2018, 01:11:00 am »
Hardware:

1) Whole house exhaust fan plugged into a Z-Wave outlet
2) Aeon 4-in-1 sensor (outside for temperature and humidity)
3) Aeon 4-in-1 sensor (inside for temperature)
4) Vera Plus controller (for the programming)
5) Ecobee thermostat

Vera ON script; Turn exhaust fan ON when ALL of the following are true (and condition);

1) Aeon 4-in-1 sensor outside air temperature less than 72 degrees (only pull in cool air).

2) Aeon 4-in-1 sensor outside humidity less than 75% (don't pull in overly humid air).

3) Aeon 4-in-1 sensor outside humidity greater than 30% (don't pull in overly dry air).

4) Aeon 4-in-1 sensor inside temperature greater than 72 degrees (turn on exhaust only when needed).

Vera OFF script; Turn exhaust fan OFF when ANY of the following are true (or condition);

1) Aeon 4-in-1 sensor outside air temperature greater than 72 degrees (too warm outside to help much).

2) Aeon 4-in-1 sensor outside humidity is greater than 75% (too humid).

3) Aeon 4-in-1 sensor outside humidity is less than 30% (too dry).

4) Aeon 4-in-1 sensor inside temperature is less than 72 degrees (turn off exhaust when cooling is no longer needed).

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Vera ON script; Ecobee set to AWAY when fan is running.  This can be done with the standard Ecobee Vera app.

Vera OFF script; Ecobee RESUME  when fan is off.  The Ecobee app does not support a resume function, so this has to be done via LUUP code (replace xxxx with your device number);

local service_id = "urn:ecobee-com:serviceId:Ecobee1"
local action = "ResumeProgram"
local args = {resumeAll="true"}
local dev_num = xxxx
luup.call_action(service_id, action, args, dev_num)

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Outside Aeon 4-in-1 needs to be more responsive than default.
111=300 4 byte Dec
113=300 4 byte Dec
101=225 4 byte Dec
VeraPlus, Nest Cameras (6), Siren, Hue Bulbs/Strips/Blooms (65), Fan Dimmer (6), Aeon 4-in-1s (10), Water Sensors (3), Z-Wave Switches (20), Nest Smoke/CO Protects (5), Ecobee 3, HEM Gen2s (2)

Offline hsmaier

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Re: Automating a whole house exhaust fan
« Reply #1 on: August 17, 2018, 01:39:01 pm »
I use this to control two attic fans. No need to complicate things to connect to vera

RANCO ETC-111000 Digital Cold Temperature Control NEW

https://www.amazon.com/RANCO-ETC-111000-Digital-Temperature-Control/dp/B0015NV5BE

I have both set to turn on when the attic temp reaches 90F and turn off at 85F

Easy to install

Howard

Vera 2 U14, Vera 2 U15, Two Trane TZEMT400AB32 Thermostats. Insteon Light Switches, Insteon Outlets, Power Linc Modem.

Offline hmspain

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Re: Automating a whole house exhaust fan
« Reply #2 on: August 17, 2018, 01:42:40 pm »
Automating a whole house fan can be easier LOL.  But... when I controlled it just with temperature, it would pull in some massively soggy air during heat waves (like we are going through recently in California).
VeraPlus, Nest Cameras (6), Siren, Hue Bulbs/Strips/Blooms (65), Fan Dimmer (6), Aeon 4-in-1s (10), Water Sensors (3), Z-Wave Switches (20), Nest Smoke/CO Protects (5), Ecobee 3, HEM Gen2s (2)