PROPER SIZING
It is important to consider that some manufacturers have inaccuracies within their generator ratings. In order to compare
sizes, a very simple conversion can be used to determine a CO
2
generator’s ACTUAL capacity to produce CO
2
. That is
assuming you know the actual Btu output of the unit. British thermal units (BTUs) are stated as the actual heat output of the
unit. Heat output (BTU), is determined simply by knowing the pressure of the gas, the type of gas (LP or natural) and the
volume of gas allowed to flow to the burner.
To convert an LP generator’s Btu rating into cubic feet of CO
2
per hour:
Btu / Hr X 1.18 Example: 22,352 Btu X 1.18 22,352 X 1.18 = 26,375
1000 1000 1000 =
26.4 cuft CO
2
/hr
To convert a natural gas generator’s Btu rating into cubic feet of CO
2
per hour:
Btu / Hr Example: 25,080 Btu 25,080
1000 1000 1000 =
25.0 cuft CO
2
/hr
So a CO
2
generator running propane, with a rating of 22,352 Btu will produce 26.4 cubic feet of CO
2
per hour assuming a
standard pressure of 11”WP is used. A natural gas fired generator rated at 25,080 will produce up to 25 cuft / hr of CO
2
per
hour. That’s not the only thing to consider.
Before operating your CO
2
generator, make sure you have accounted for the heat it will be producing. The ratings in the
specification section of this manual give you the Btu per hour rating. Keep in mind that if the CO
2
generator is only ON for 30
minutes each hour, the Btu / hr rating would be reduced by one half resulting in CO
2
outputs of ½ the capacity rating.
Determining what size unit and how long to allow the unit to run for is almost impossible due to the variables which
different areas exhibit. Areas which are well sealed and have coordinated cooling devices can be easily maintained compared to
areas which are not sealed or use a exhaust fan at all times.
EXPANDING / ADDING BURNERS
The unique ability to increase the CO
2
production capacity of the GEN-2 by adding burners allows you to expand as
necessary. Installing additional brass burners can increase the GEN-2’s CO
2
producing capacity. Use only CAP burners. The
brass burners CAP uses are customized specifically for CO
2
production. Each burner installed adds approximately 3 cubic feet
of CO
2
per hour.
* People operating at altitudes higher than 3000ft above sea level may need to use slightly smaller burners to reduce
fuel flow due to lower levels of oxygen available. If the flames appear yellowish or too large, please contact your dealer
or CAP for special burners which are designed to operate at higher altitudes.
(LPC-1 & NGC-1)
Conversion Kits
: .Your generator can easily be converted to operate on either LP or natural gas by
changing the brass burners and the pilot orifice. A conversion kit is available from your dealer.
(PXO-1) Propane crossover:
The Propane crossover assembly allows you to run your generator off of 2 propane tanks. You
can run it so that both will run down at the same time, or you can choose which tank to run the generator off of. That way the
pilot flame never has to be re-lighted when changing out tanks.
CONTROLLER OPTIONS
CAP offers a full line of CO
2
controllers from simple to sophisticated. Controllers such as the
CO
2
-2 or CO
2
-4 controllers intelligently coordinate your exhaust fans with the GEN-2. They also
have built-in recycling timers and an optional Part-Per-Million upgrade. The simple and
economical PPM-3 is designed specifically for people who want Part-Per-Million accuracy from
their generator.
Some people believe that because a generator is so much cheaper to operate than compressed
CO
2
systems, they will not need a CO
2
controller to regulate the CO
2
level inside their area. This is
incorrect. CO
2
generators produce quite a bit of heat and water vapor, which must be considered
during your setup. Remember that the longer the CO
2
generator runs, the more heat you are
producing. In some cases the extra heat is not a problem, but for some setups, it is almost
imperative to use some type of controller that turns on the generator only when the CO
2
level is
below the desired level. Using a timer to control the generator can be done with some success but
you may end up quite a bit above or even worse quite a bit below your intended CO
2
level.
CO2-2
PPM-3
