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Entry Date
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Location
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Sunday, April 21, 2024
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Matt D.
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Connecticut
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Entry 16 of 116 |
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Cold Frame Vent + Fan Thermostat and Light Controller Timer
The gray PECO thermostat with the metal coils is sensing the air temperature and even though it is an analog version this is perfectly fine. It does need to be set in relation to the other digital thermostat present so they do not work against one another as this one is responsible for cooling and not heating. When this senses the air temperature has reached about 86F (30C) it will turn on an exhaust fan and open a vent. This allows for cooling of the cold frame by moving air. This is also dialed in to work with a similar (but larger) ventilation system for the larger hoop-house structure.
However, when the venting system for the cold-frame is activated the CO2 system can sense this and goes into idle mode so the CO2 is not wasted by being vented out of the structure. Once the venting system turns off, the CO2 system will reactivate and start dosing CO2 again as the vents will be closed.
Scientific Article “Effect of Vent Openings and Insect Screens on Greenhouse Ventilation” :
https://www.researchgate.net/publication/222921589_Effect_of_Vent_Openings_and_Insect_Screens_on_Greenhouse_Ventilation
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