ᐅ Is my central mechanical ventilation system working correctly?

Hello everyone,
I have a question regarding the mechanical ventilation with heat recovery (Westaflex, central system with heat recovery and bypass function):

Indoors (exhaust air temperature 24°C (75°F))
Outdoors 35°C (95°F)
Setpoint room temperature 20°C (68°F)

With these values, the hot outside air should actually pass through the heat exchanger to be cooled by the "only" 24°C (75°F) exhaust air. However, the hot outside air bypasses the heat exchanger instead: the bypass damper is active.

How is it working for you?

It depends on how the bypass damper is controlled. If it has priority, it will always open at the set outdoor temperature.

You can forget about "cooling" through the heat exchanger. That’s just a marketing gimmick.

Mycraft schrieb:

"Cooling" through the heat exchanger is something you can forget about. It’s just a marketing gimmick.

I understand that, but it’s definitely better than blowing in air at 35°C (95°F) directly.

*Edit* I just realized I created my thread in the wrong subforum --> please move it to Controlled Residential Ventilation with Heat Recovery, THANK YOU!

If you try to cool 35°C (95°F) outside air with your 24°C (75°F) indoor air, you won’t be able to maintain 24°C (75°F) inside for long. This is because your indoor air volume is limited…

seat88 schrieb:

If you try to cool outside air at 35°C (95°F) down to your indoor temperature of 24°C (75°F), you won’t be able to maintain 24°C (75°F) inside for long. Because your indoor air is limited...

Currently, 24°C (75°F) air is going directly outside, and 35°C (95°F) air is coming in uncooled (without passing through the heat exchanger). This option is even worse. The ventilation system is not turned off; it runs 24/7.

If I understand correctly, the bypass of your mechanical ventilation with heat recovery should be able to switch automatically. This means something is not working: it might be stuck, incorrectly connected, poor control, or a faulty sensor.