CO₂ Generators, Accessiories and Conversion Kits

Carbon Dioxide Enrichment will dramatically increase the growth of green plants. Green plants use carbon dioxide (CO₂) and water in the presence of light to synthesize organic compounds. The plant then converts these organic compounds into elements that it can use (food). This process is called photosynthesis. If any of these ingredients (CO₂, water or light) are at levels below what the plant can use for maximum efficiency, it will only be able to perform at that level and no greater. Adding carbon dioxide to a growing environment that is not receiving proper nutrients or is low on light will not produce the desired results. Similarly, plants that are receiving plenty of sunshine and nutrients will only perform as well as the ambient level of CO₂ will allow. The ambient level of CO₂ in the earth's atmosphere is generally between 300 and 600 parts per million. Most plants receive far more water and energy in the form of sunshine than they can use. Increasing the CO₂ in the growing area will let the plant use the excess water and energy that is stored in the leaves. The result is a substantial increase in the growth rate of any plant that uses chlorophyll in the process of photosynthesis. Enrichment should commence at sunrise or when photoperiod begins and refrain during darkness hours. The average CO₂ level that is recommended is 1000 to 2000 ppm. The object is to maintain a constant level in the atmosphere. You can run a small unit continuously during photoperiods or you can use a larger unit and time it to function periodically. Where exhaust requirements are frequent, the latter method is preferable. After the exhaust function the generator can be cycled to replenish CO₂ quickly to maintain rapid plant photosynthesis. Use the operation time charts to determine the size of generator and the number of minutes of operation required for the level of CO₂ desired. Frequency of recharge depends on the rate of consumption. For the greatest fuel economy and accuracy of recharge it is recommended that the Green Air Products CO₂ Monitor Controller (CDMC) be used with all generator and emitter systems.

Carbon dioxide enrichment equipment and methods have improved as experience and the understanding of atmospheric control and plant physiology has advanced. Plant metabolism and growth rate are dependent on the available atmospheric CO₂. Plants are keenly sensitive to CO₂ variations and optimum values must be constant and precisely controlled. The method, timing, and size of equipment must be properly determined to provide maximum benefits and economy. Carefully follow the operation charts to choose the proper size generator for the cubic foot area. Keep the recharge times to a minimum for best results. Do not undersize the generator or optimum results may never be achieved.

Carbon dioxide enrichment equipment and methods have improved as experience and the understanding of atmospheric control and plant physiology has advanced. Plant metabolism and growth rate are dependent on the available atmospheric CO₂. Plants are keenly sensitive to CO₂ variations and optimum values must be constant and precisely controlled. The method, timing, and size of equipment must be properly determined to provide maximum benefits and economy. Carefully follow the operation charts to choose the proper size generator for the cubic foot area. Keep the recharge times to a minimum for best results. Do not undersize the generator or optimum results may never be achieved.

CO₂ Charge Time

	Room Dimensions (ft) LENGTH WIDTH HEIGHT

	CO2(PPM) CO2 GENERATOR MODEL PICK ONE CD-3-NG CD-3-LP CD-6-NG CD-6-LP CD-12-NG CD-12-LP CD-36-NG CD-36-LP

	Total minutes = (minutes generator must be on to reach the CO2 level you chose)

This chart will give you minutes of operation required for areas and models shown. Top row of the chart represents the cu. ft. of area (Length x Width x Height) in the enclosure. Left column is model size. Model numbers represent maximum CO₂ output per hour in cubic feet (CD-3 = 3 cu ft/hr). Example: A CD-6 will take 10 minutes to produce a CO₂ level of 1000 ppm in a 1000 cu. ft. enclosure.

Large greenhouses logically require longer charge times and multiple units may be necessary. The CD-36 takes 1.66 min. per 1000 cu. ft. area. Therefore a 20,000 cu. ft. area would be 20 X 1.66 = 33.2 min. to charge to 1000 ppm. For this application this may be an acceptable charge time. The area should be charged as quickly as possible for maximum advantage. Charging the atmosphere quickly insures that the rapid photosynthesis process will not be interrupted and the plants growth rate reduced Five to ten minutes is a good charge time. Try not to exceed twenty minutes when possible although this is not always practical in very large spaces. Your microclimate will need to be recharged every one to four hours depending on how much atmosphere is lost due to natural convection or plant usage.

	CO2 Generator 1000 PPM Operation Time Chart CU / FT 100 200 400 600 800 1000 1200 1400 1600 1800 2000 CD-3 2.00 4.00 8.00 12.00 16.00 20.00 24.00 28.00 32.00 36.00 40.00 CD-6 1.00 2.00 4.00 6.00 8.00 10.00 12.00 14.00 16.00 18.00 20.00 CD-12 .50 1.00 2.00 3.00 4.00 5.00 6.00 7.00 8.00 9.00 10.00 CD-36 .17 0.33 0.66 1.00 1.33 1.66 2.00 2.33 2.66 3.00 3.30 Based on 1000 ppm CO2 enrichment

	Specifications CO2 Output CD-3 CD-6 CD-12 CD-36 LP NG LP NG LP NG LP NG Cu Ft CO2 / Hr 3.2 3.4 6.2 6.4 12.4 12.8 37.2 38.4 Pounds CO2 / Hr .376 .388 .753 .776 1.51 1.56 4.54 4.66 Max BTU / Hr 2183 2172 4366 4343 8733 8686 26196 26058 Fuel Consumption Cu Ft / Hr 1.03 2.01 2.05 4.02 4.1 8.04 12.3 20.12 high-wide-deep (inches) 12-10-5 12-10-5 15-12-7 15-12-7 15-12-7 15-12-7 15-12-12 15-12-12 Weight  (lbs) 9 9 12 12 14 14 27 27 Shipping Weight  (lbs) 11 11 14 14 16 16 30 30 Transformer 110 / 12vdc 500 mA  center positive

	Item No. Retail Propane CD-3LP $510.00 CD-6LP $600.00 CD-12LP $685.00 CD-36LP $845.00 Natural Gas CD-3NG $545.00 CD-6NG $620.00 CD-12NG $700.00 CD-36NG $865.00

CO₂ Conversion Kits and Accessories

	Item No. Description Retail CVK-3LP CD-3NG conversion kit from NG to LP $40.00 CVK-6LP CD-6NG conversion kit from NG to LP $45.00 CVK-12LP CD-12NG conversion kit from NG to LP $50.00 CVK-36LP CD-36NG conversion kit from NG to LP $60.00 CVK-3NG CD-3LP conversion kit from LP to NG $50.00 CVK-6NG CD-6LP conversion kit from LP to NG $55.00 CVK-12NG CD-12LP conversion kit from LP to NG $65.00 CVK-36NG CD-36LP conversion kit from LP to NG $85.00 LPCV-1 liquid propane crossover valve $95.00 T12VDC 120V DC transformer $16.00 CO2HSE CO2 generator hose $35.00 LPREG-1 Propane gas regulator $35.00 NGREG-1 Natural gas regulator $40.00