Johnson CO2 Generator

Normally there are approximately 300 parts per million (PPM) of CO² in the atmosphere; when this level is increased to over 1000 PPM, it results in higher production and better plant quality. The Johnson Generator provides up to 1500 PPM per unit in a 4800 square foot (446 square meter) greenhouse. By adding CO², especially during the winter months when greenhouse ventilators are closed and when low CO² concentration becomes a limiting factor in growth, growers are obtaining yield and bloom quality similar to that which is normally associated with spring and summer conditions.

Standard Features

• Completely automatic
• Includes a gas pressure gauge
• 24 Volt gas valve
• Automatic shut-off in case of flame failure
• Easy installation – hangs from ceiling – requires no duct work
• 18″ diameter, 20″ high, and only 21 pounds
• Optional timer/thermostat available

How To Use It

When there is sunlight and the vents are closed, CO² should be added continuously to your greenhouse. If the vents are opened because of heat build up the generator should continue to operate for about 2 hours and then be shut off. Approximately 1 lb. of CO² per hour per 10,000 sq. ft. yields 1,000 ppm’s of CO². If CO² level drops off from 1,000 ppm’s to 500 ppm’s on a clear sunny day, you can easily adjust to a higher burning rate to make up for the more rapid absorption of CO² by plants. Most growers use their Johnson Generator daily in winter from approximately 7:30 am to 4:30 pm.

Specifications

Maximum area fertilized per unit*: 4,800 Square Foot
Cubic feet/hr. Co2 @ 60 F: 72
Pounds Co2/Hour: 8.25
Burner Range BTU/Hour: 20,000 to 60,000

*Based on adding 1,500 ppm Co2 to a greenhouse with one air change per hour.
Slightly less when burning natural gas.