Equipment selection steps and operation safety Suggestions for fresh air units

The equipment selection steps of fresh air unit are as follows:

1. Select the form of the new fan according to the installation Settings;

2. Determine the design conditions for cooling capacity and heat generation;

3. When selecting the air volume and wind pressure of the equipment, the principle shall not be less than the design value;

4. In principle, fresh air units are only responsible for the amount of fresh air required for a floor (definition: volume of air per unit time).

Suggestions on safe operation of fresh air units

1, the construction unit in winter construction of the fresh air unit of the anti-freezing problem is serious, pay attention to all air-conditioning equipment and pipeline anti-freezing. The key point of relative humidity control of fresh air unit is the location of humidity sensor or the selection of control parameters, which is related to the source and control mode of humidification. Pay attention to the outdoor air temperature during piping pressure test flushing, and ensure the complete system drainage after flushing and no safety hazards. The use of fresh air units for temporary heating should also be inspected and accepted in accordance with the normal procedures. If there is no automatic control measures and special management, it is not recommended to use fresh air air-conditioning equipment for temporary heating.

2. In the design of fresh air units, an effective anti-freeze automatic control interlock monitoring device must be set up. Fan operation, must first guarantee the rated flow of heater, when the water temperature too low or the water flow through the hour should call the police, timely closing blower and air insulation, air valve does not provide adequate protection, fresh air units in fact only semi-finished products, in the cold region winter running without security, not optional "duty".

3. Establish and improve the operation management system. The fresh air unit that stops at night should also use constant flow rate or temperature controller to automatically control the water valve to open or set up electric heating device to ensure the temperature of the fresh air unit heater. During the operation of fresh air units in winter, weather changes should be checked regularly. In cold weather, the commissioning and maintenance of the air-conditioning system should not be arranged to ensure the safe operation of the air-conditioning water system.