AD Series Periodic Maintenance

The AD series are silica gel rotor industrial dehumidifiers that run continuously in production areas and warehouses where low humidity is needed. In this episode we cover safety, handling, delivery, positioning, service clearances, duct connections and the electrical supply for models AD1000 to AD6500, based on the manufacturer's manual.

How well an AD series silica gel rotor dehumidifier performs on site depends on the checks made at first start-up and on correctly set airflows. In this episode we cover the pre-checks, phase sequence, operating modes, setting the process and regeneration airflows, steam and hot water coils, humidity control and the performance check, based on the manufacturer's manual.

We go through the most common fault symptoms on an AD series silica gel rotor dehumidifier and the first checks to make before calling service: unit will not start, has stopped, stopped in automatic or remote mode, lost capacity, tripped fuses, white service light, rotor not turning and low airflow. For any alarm not covered here, call the authorised service.

A wheeled refrigerant dehumidifier works in warehouses, factories and on building sites, and where it stands matters as much as its capacity. In this episode we cover taking delivery of a heavy-duty industrial portable dehumidifier, positioning it in a warehouse, condensate options, the electrical connection and first start-up, based on the manufacturer's manual.

Maintaining a wheeled refrigerant dehumidifier is simple, but if it is skipped, capacity drops and the unit is put under strain. In this episode we cover how often and how to clean the filter, condenser cleaning, what the four control panel lights mean, the defrost cycle, and what to check when the unit does not start or collects no water, based on the manufacturer's manual.

A pool dehumidifier runs almost all year in warm, humid, chlorinated air; when maintenance slips, capacity drops first, then humidity rises and condensation appears on the walls. This episode covers what to do, and how often, for a wall-mounted pool dehumidifier: safety, monthly filter cleaning, removing the cover, daily use, the annual service checklist, shock chlorination, summer shutdown and the symptoms that need a service visit.

The psychrometric calculator is a free engineering tool that works out every property of moist air from two known values. This episode shows, step by step, choosing the location and altitude, entering two known values, saving and comparing summer and winter conditions, the psychrometric chart, the comparison table and the PDF report.

The cooling coil calculator shows how much heat a coil in an air handling unit removes and how much water condenses out of the air. This episode works through an air handler in summer step by step, covering total, sensible and latent capacity, the SHR, the condensate rate, scenario comparison and the cooling process on the psychrometric chart.

In winter, cold fresh air mixes with return air in an air handling unit, and the mix is then heated in the heating coil. This episode calculates both steps in turn with the air mixing and heating coil tools, showing mixing by mass, the heating capacity, the hot water flow and why relative humidity falls when air is heated.