Greenhouse Cooling Fog System Guide: Setting the Foundation for High-Performance Operation

Inspect greenhouse fog cooling systems thoroughly as the summer growing season approaches. Since last summer, the fog cooling system has been inactive. It is advisable to carefully check the system now to ensure everything is in good working order before the demands of cooling and humidifying crops through the hotter months.

Consider the fog system’s peak performance crucial for effective environmental control inside the greenhouse. Optimal plant growth and productivity depend on precise temperature and humidity levels.

Any issues with the greenhouse cooling system can negatively impact the ability to regulate the indoor climate.

Nozzle Blockage Inspection for Optimal Water Flow

MicroCool nozzles are used in many fog systems installed in greenhouses. These nozzles typically feature an extremely small 0.008 inch (0.20mm) diameter orifice.

These tiny orifice openings often face blockages over time. Accumulation of calcium and mineral deposits around the nozzle tip causes the blockages. Evidently, the gradual build-up of deposits can restrict water flow through the nozzle.

Understanding How Nozzle Blockage Affects System Performance

The importance of nozzle blockage lies in the operation of the fog system to cool the greenhouse by evaporating water into the air (adiabatic cooling).

However, if nozzles become partially or fully obstructed, they effectively reduce the overall cooling capacity of the entire greenhouse fog system.

A single functioning MicroCool nozzle is estimated to provide a similar level of cooling to a standard 1-ton air conditioning unit. Blocked nozzles, therefore, significantly diminish the achievable “cooling power.”

Consequently, the control system may not properly reach the temperature set points, causing stress to the crop if the indoor climate becomes too warm.

Restoring Nozzle Functionality

To address nozzle blockage, immerse the nozzles in vinegar to dissolve and eliminate calcium and mineral deposits effectively. Initiate the process by soaking the affected components, allowing the vinegar to work its dissolving magic.

Subsequently, use a wire brush to meticulously remove any remaining deposits, ensuring a thorough cleansing. This method offers a reliable means of restoring the optimal functionality of the nozzles, promoting seamless operation within the fog system. Avoid using aggressive cleaners such as CLR.

Essential Maintenance for Your Greenhouse Fog System

In addition to individual nozzle checks for blockages or issues, other key components of the fog system require maintenance and inspection before the season gets into full swing.

Routine Oil Changes

The MicroCool pump, along with pumps from other manufacturers, is recommended to have its lubricating oil changed. Perform a change every 500 hours of operation to ensure optimal performance.

If there are no clear records of the last service, it is advisable to change the oil now as a precaution. Note the current hour meter reading and service date for future reference.

Filter Replacement

Clogged or dirty filters are another common problem area, especially during system start-up after a period of inactivity. Filters often face accumulation of debris and mineral deposits in the water supply over time. Build-up leads to excessive water flow restriction and unwanted strain on the pump.

In all MicroCool pump models, a blocked filter may trigger an automatic shutdown of the pump unit. A trustworthy precaution to avoid potential damage. Replacing clogged filters is more cost-effective than needing repairs or a new pump down the line.

Successfully Prepping Your Greenhouse Cooling System

This fog system checklist is intended to serve as a useful guide as the cooling system is prepared for the growing season ahead. Proper maintenance now will help ensure optimal performance when needed most over the warm summer months.

Any further questions are welcome. Drop us a line at or call 760-322-1111.