The problem...

Uncontrolled amounts of dry or hot air in your bulk drying store can become a big problem.

Condensation and wetting of the top layers of the crops is caused by either excessive overheating of ambient air or the constant blowing of air which is too dry. The hotter and dryer the air, the more moisture it can hold. So, if the air holds an excess of moisture it cools and unloads some of the water as it meets colder material in the crop. This causes harmful wetting in the top layers of the crop.

...the proven solution

By blending ambient air with heated air the CHC system produces accurately controlled, constant humidity in the air duct, regardless of ambient humidity, temperature changes or back pressure. By simply dialling-in the humidity required, the CHC unit will remove up to 0.5% moisture per 24 hours with an air flow of 100 cu.ft/min/tonne.

CHC - Automatic, Constant Humidity Control Systems

By adding a Harvest Automatic

Constant Humidity Controller (CHC) to your existing crop store you can effectively dry 24 hours a day during any weather conditions. The CHC system has a proven record of accuracy, efficiency and economy- there are thousands of units in use. It's the easiest and surest way of turning bulk storage systems into reliable drying units.

Economical drying rates are achieved because the CHC system gives continuous drying all the time the store fan is running. The CHC is effective on all usual combinable crops.

CHC Twelve CHC models produce from 200,000 to 4,000,000 BTU/hr to suit all types of fans. Each one features purpose-built solid state electronics and plate-type burners ensuring accurate, trouble-free performance.

The gas fired unit will also operate on a temperature control basis with the addition of a temperature sensor, so giving accurate operation for onion drying and other products relying on temperature rather than humidity control.

And there's a back-up service to match for complete peace of mind.

PLATE-TYPE BURNER HEAD

Harvest's purpose built burner head has been developed to give the maximum possible heat output and the most efficient combustion of LPG. It's size is as compact as possible keeping the CHC unit easy to handle, portable and small enough to be installed into the majority of existing bulk store types.

ELECTRONIC CONTROLS

The CHC control system is conveniently housed under a protective lid. It incorporates a large digital display showing humidity or temperature levels. A computerised programme of heat output relevant to ambient humidity gives you a very accurate control system that's been verified by independent assessors. This system is common to all CHC models.