Green Air Natural Gas CO2 Generator CD-3NG

Choosing the right size Generator

CD-3 through CD-36

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.

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.

Click here for printable chart

Fuel Consumption

This chart is used to decide how long a tank of propane will last. This chart is fairly self explanatory first you will look in the left column to pick a model, then follow it across to the propane tank size you have. The number that corresponds with the two selections will be the number of hours that you can operate the CO2 Generator.

Generator Installation

WALL MOUNT

Bracket wall mount screw holes must be 10 inches center to center. Mount brackets to wall and housing will slip over screw heads and fit snug into slotted holes in housing back. This allows for easy removal of housing from wall brackets. Make certain bracket screws are secure in wall and use good judgment when choosing mounting location.

SUSPENDED

Use chain, eyebolts and ceiling hooks found in hardware pack. Hang unit from sturdy location at least 18 inches from ceiling. The unit must operate in level upright position. "CAUTION" Should unit fall during operation fire may result.

FREE STANDING

Remove four screws holding bottom plate on housing. Locate holes on bracket to match and replace screws .

OPERATING PROCEDURE

IGNITING PILOT BURNER

1. Plug the transformer into a grounded 110 V timer and power source. 2. Depress the RED button located on the inside of the generator for 90 seconds to clear the air from the hose. 3. Once gas is present at the pilot let up button and wait 60 seconds for excess gas to clear from the housing. Now depress the RED button again and light the pilot burner. Maintain holding the button down for an additional 30 seconds to allow the thermocouple to heat to operating temperature.

4. Push the front on-off switch to the "ON position. If your timer is also in the on position fuel will pass through the solenoid valve and the main burner will be ignited by the pilot flame. As your timer cycles on and off so will the main burner flame. 5. For the CD-18 and CD-36 , the brass needle valve may be used to adjust the flame size. This will increase the time that the unit needs to charge the space with CO2.

FUEL HOOK-UP

Propane model

2. Carefully thread the regulator flange nut in the tank valve counterclockwise with your fingers until you feel the flange seat. Tighten firmly with adjustable end wrench. DO NOT USE PLIERS! Fasten hose between regulator and generator gas inlet in same fashion. 3. Turn the propane tank valve to wide open "ON" position. 4. Check for gas leaks. A solution of 25% hand dish soap and 75% water in a spray bottle will work well for detecting gas leaks. Apply solution to all previously connected fittings. Bubbles will occur around loose connections. Always use two wrenches when tightening multiple fittings.

1. For propane applications use a propane tank that has been filled to only 80% of it’s capacity. This is very important for all propane burning mechanisms. Failure to observe this common rule will make your generator hard to ignite and will not stay lit (refer to troubleshooting).

Replacement LPG regulator and hose: GAP propane CO2 generators use a standard small appliance type propane regulator such as might be used with a small heater or barbecue. It can be obtained at most hardware or home improvement stores. Original equipment comes with a Marshall Brass model 140 LPG tank mount regulator. The outlet uses a 1/4 inch male pipe thread to 1/4 male hose fitting to facilitate a flexible hose connection between the regulator and the generator. The regulator inlet uses a standard LP tank POL fitting to connect to the LP tank. The fuel hose is a typical flammable gas type welding hose such as might be used with an acetylene welding torch. These parts are available at a welding supply store.

Specifications

If you have any questions, feel free to ask.

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