Product Category / Fans and Heaters

Fans and Heaters

The demands of farming are never-ending. Maintaining consistent grain quality is essential to long-term profitability and viability. PMR supplies a complete line of aeration and grain-conditioning systems to help maintain grain quality in any operation.

PMR Diesel Heat Exchanger

Tired of dealing with gas bottles for your drying floor? Wish you could utilize just one fuel source for your farm? The high output 300kw dual stage PMR Heat Exchanger is designed and engineered to utilize a diesel burner to replace the need for the use of gas bottles.

The PMR Heat Exchanger is engineered with heavy duty construction and design to ensure it has quality, reliable and longevity at the highest commercial level. The PMR Heat Exchanger utilizes a high efficiency design with innovative, multiple passes through heat tubes to ensure all heat and energy is utilized and not lost out the chimney. The PMR Diesel Heat Exchanger includes all plenum chambers with removable panels if cleaning is ever required, while the indirect heat ensures no contamination of the products being dried due to the diesel by product being contained within the heat exchanger.

The PMR diesel heat exchanger comes pre-assembled and is easy to transport, meaning it can be widely shipped and installed anywhere in New Zealand.

Ideal for drying crops, grains and seeds in silos, drying floors or adapted to any other crop storage and drying applications.

Harvest CHC Burners

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. Its 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.

A large range of models are produced, 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.

Features

Plate-type Burner Head

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

Fan Technology

Harvest's designers have successfully matched fan size to burner output. This gives the maximum air output with minimum electricity consumption and the lowest noise levels.

Electronic Controls

The total CHC control system is conveniently housed. 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.

Safety Regulated

All Harvest equipment and components are manufactured to current regulations and each CHC unit carries the CE mark.

This guarantees that each CHC model has the highest specifications and top - quality components.

Product Types

CHC Onion Burners

High capacity Fans in onion stores have led to the development of multiple units with a single master unit controlled by one sensor within the main air - duct.

Harvest Installations can supply multiple units on purpose built frames for either grain stores with multiple fan units or onion drying plants with their high capacity fans and large air ducts.

Harvest Advance Controller

To give a complete drying and conditioning system, Harvest have designed an automatic fan control unit, using the same humidity or temperature sensors that control the burners, fans can be programmed to run between upper and lower limit controlled by either the humidity or temperature sensor.

This is invaluable when cooling stored crops and eliminating the possibility of 'rewetting' grain or running fans when ambient conditions are not suitable.

Harvest Maxi-Stirrer

As more farmers use the Harvest Maxi-Stirrer as a batch dryer employing high temperature air for faster drying, larger models of CHC are used to give the necessary temperature lift, aisles multiple units.

The larger models give the required temperature control in onion stores where exceptionally high volumes of air are required. Please get in touch for further details of the Maxi-Stirrer and crop drying fans

Product Information & Performance Data

Model	Max heat output required		Max airflow in C.F.M for guaranteed drying	Max Airflow in C.F.M to give 30° temp lift
	BTU / HR	KW
CHC 20S	200,000	58.6	14,000	3900
CHC 20D	400,000	117.2	28,000	7800
CHC 30S	300,000	87.9	21,000	5860
CHC 30D	600,000	175.82	42,000	11,720
CHC 35S	350,000	102.5	24,500	6830
CHC 35D	700,000	205	49,000	13660
CHC 45S	450,000	131.8	31,500	8790
CHC 45D	900,000	263.6	63,000	17580
CHC 60S	600,000	175.8	42,000	11720
CHC 60D	1,200,000	351.7	84,000	23440
CHC 75S	750,000	219.7	52,500	14660
CHC 75D	1,500,000	439.4	105,000	29330
CHC 100S	1,000,000	293	70,000	19530
CHC 100D	2,000,000	586	140,000	39060
CHC 200S	2,000,000	586	140,000	39060
CHC 200D	4,000,000	1172	280,000	78130
CHC 225S	2,250,000	659.2	157,500	43940
CHC 225D	4,500,000	1318.4	315,000	87880
CHC 250S	2,500,000	732.4	175,000	48820
CHC 250D	5,000,000	1464.8	350,000	97650
CHC 300S	3,000,000	879	210,000	58590
CHC 300D	6,000,000	1758	420,000	117180
CHC 350S	3,500,000	1025.5	245,000	68350
CHC 350D	7,000,000	2051	490,000	136700
CHC 400S	4,000,000	1172	280,000	78130
CHC 400D	8,000,000	2344	560,000	156260

Optional Extras

DOWNLOAD BROCHURE

GSI Fans and Heaters

Having the right size of fan and drying system for your specific operation is key. Too much airflow can be as bad – sometimes even worse – than too little airflow.

PMR can supply and install a wide range of GSI fans and heaters to suit your requirements.

Choose from a variety of high efficiency vane axial, centrifugal, and heaters.

Designed to reduce costs and boost performance.

Centrifugal Fans

1750 RPM CENTRIFUGAL FANS

Built with a heavy galvanized steel, scroll-type housing and inverted inlet venturi. A non-overloading backward inclined airfoil wheel provides high airflow with a long motor life. These fans operate at a low noise level and accommodate a variety of heaters for use on drying bins where higher capacities are required. Models are available from 5 - 50 HP with static pressures up to 11".

3500 RPM CENTRIFUGAL FANS

Designed to operate in static pressures up to 22". These fans are used primarily with tall tanks or small grains tanks with high resistance to airflow. 3500 RPM centrifugal fans can not be used with heaters due to their design.

Vane Axial Downstream Heater

For use as a medium to high temperature downstream on axial fans or with deluxe models as a low temperature, equilibrium or medium temperature burner on 1750 RPM centrifugal fans.

With capacities up to 3.0 million BTU/hr., our heater combination provides the very best in high capacity grain drying. Vane axial heaters are available in 18" to 28" dia., liquid propane, propane vapor or natural gas models.

Upstream Heater

A low or medium temperature burner for use only upstream on 1750 RPM centrifugal fans. Capable of .3 to 1.1 million BTU/hr., and available in propane vapor or natural gas, perfect for the drying/aeration of rice, corn or other select grains.

Centrifugal Downstream Heater

For use downstream as a medium or high temp burner on 1750 RPM centrifugal fans. Not for use as a low temperature burner. Specially designed burners are adjustable for uniform heating temps with a choice of liquid propane, propane vapor or natural gas. Available for GSI 1750 RPM (10-40 HP) centrifugal models, the downwind centrifugal burner is capable of capacities up to 4.2 million BTU/hr.

Welvent Heaters

The most important component of any crop store is the fan, it is the engine or the heart of the system.

Air movement is critical to the optimum operation of any storage and drying system.

The Welvent range is made up of both axial and centrifugal fan units, which means that the optimum fan can be selected for the job.

Fans are chosen to suit the volume and pressure requirements of the crop and system whilst giving consideration to other important factors such as noise, power availability and efficiency.

British Built
Heavy Duty
Precision Engineering
Reliable

Welvent agricultural crop storage specialists for potatoes, grain and onions. Supplying both ambient and refrigeration equipment control systems.

Let’s Talk

PMR can assist you with everything from drive over drying floors,
drying spears, driers, fans &heaters, conveying & handling to testing equipment products.
Give our sales team a call today and let us find a solution together.