The ERV fresh air system bypass control module of the ERV (Energy Recovery Ventilation) fresh air system is one of its core functions. It is mainly used to bypass the heat exchange core under

specific conditions and directly adjust the airflow path of fresh air and exhaust air to achieve energy saving, protect equipment or adapt to different environmental requirements.

‌1. Core functions of bypass control module‌

‌Energy saving in transitional seasons‌

‌Scenario‌: In spring and autumn (when the temperature difference between indoor and outdoor is small), the energy recovery effect of the heat exchange core is not obvious, and m

ay even increase the system resistance.

‌Function‌: The bypass module will bypass the heat exchange core, directly introduce fresh air and exhaust gas, reduce fan energy consumption, and maintain ventilation.

‌Extreme climate protection‌

‌Anti-frost/overheating‌: In extremely cold or hot environments, the heat exchange core may frost (in winter) or overheat (in summer) due to excessive temperature difference.

‌Measures‌: The bypass module temporarily shuts down the heat exchange function to avoid damage to the equipment and extend its service life.

‌Fast ventilation demand‌

‌Scenario‌: A large amount of ventilation is required in a short period of time (such as a sudden increase in indoor pollutant concentration), but energy recovery is not required.

‌Function‌: Enable bypass mode to directly introduce fresh air and exhaust gas to improve ventilation efficiency‌. ‌Humidity control‌

‌Scenario‌: In humid areas (such as the rainy season), if the heat exchange core may transfer moisture, the indoor humidity will increase.

‌Response‌: The bypass mode can reduce moisture exchange and is more efficient when used with a dehumidifier.

‌II. How the bypass control module works‌

‌Automatic control‌: Through the temperature and humidity sensor or air quality sensor, the system automatically determines whether to enable the bypass mode. For example:

When the indoor and outdoor temperature difference is ≤5℃, it automatically bypasses to save energy.

When the risk of frost on the heat exchange core is detected, it automatically switches to bypass and starts antifreeze protection.

‌Manual control‌:

Users can manually switch the bypass mode through the control panel or APP to meet special needs (such as rapid ventilation after cleaning).

‌III. Typical application scenarios‌

‌Home environment‌

In extremely cold weather in winter, prevent the heat exchange core from freezing.

When the air conditioner is running in summer, prevent the heat exchange core from transferring high outdoor temperatures.

‌Commercial/industrial environment‌

Places such as kitchens and laboratories where polluted air needs to be quickly discharged.

Areas that are sensitive to temperature and humidity, such as data centers, to avoid heat exchange affecting precision equipment.

‌IV. Advantages and Disadvantages of Bypass Mode‌ ‌Advantages‌:

✅ Energy saving and consumption reduction (reducing the burden on fans and heat exchange).

✅ Protect equipment and reduce maintenance costs.

✅ Flexible adaptation to different environmental requirements.

‌Disadvantages‌:

❌ Energy cannot be recovered in bypass mode, which may affect the stability of indoor temperature and humidity (need to be used in combination with specific scenarios).