The CP101 pneumatic velocity controller
is the most versatile pneumatic controller
available. This unique controller maintains
the air flow dictated by the thermostat while
compensating for changes in duct static
pressure. The air flow control is pressure
Factory calibrated to the specified maximum
and minimum air volumes, the CP101 can be
easily adjusted in the field. Note that field
adjustment is required only when operating
conditions change - not as a maintenance
- Provides accurate control over a duct
velocity range of 0 - 3000 fpm.
- Operates at low system pressures.
- Completely pressure independent.
- Adjustable maximum and minimum air
volume settings easily field adjusted if
- Reset span remains constant regardless
of maximum and minimum air volume
- Provides constant 5 psi reset span as per
standard factory calibration.
- Has adjustable start point for reset span
to accommodate auxiliaries such as
- Includes option to expand reset
span to 10 psi to accommodate most
thermostats (see notes).
- Adjustable to accommodate either direct
acting or reverse acting thermostats.
Also settings for either normally open
or normally closed damper operation
without added control components (see
- Mounted face down as standard. All
adjustments and tubing connections
are directly accessible through a ceiling
- Air volume adjustment knobs include
slots to allow screwdriver adjustment.
- Models with normally open dampers
can be programmed for early morning
warm up or cool down.
- Operates on 15 - 25 psig main air source
of clean, dry air (see notes).
- Control air consumption no more than
1. For a constant 10 psig reset span, the
control system main air source must be
maintained at a minimum of 20 psig.
2. Damper actuator will require relocation
to reverse damper rotation if changing
from normally open to normally closed
or vice versa.
3. Price cannot warrant against oil, water
or other contaminants that may occur
in the main control air. Neither can Price
warrant against inadvertent exposure to
main control pressures in excess of 25
psig as qualified above.
CP100 or CP200 Controller
For applications less demanding than those
where the CP101 controller is required,
the lower priced CP100 or CP200 can be
Operation is completely pressure independent,
with adjustable maximum and
minimum air volume settings. Both the
CP100 and CP200 controllers feature a
constant reset start point at 8 psi. The direct
acting CP100 operates from 8 psi to 13 psi.
The reverse acting CP200 operates from 8
psi down to 3 psi.
The available reset span will be governed
by the point of selection of the terminal
unit from the performance table. The full 5
psi reset span is obtained only when the
maximum air volume is set at 100% of the
terminal unit capability. 100% capability is
defined as the air volume when the terminal
inlet velocity is 3000 fpm.
While the start point is fixed at 8 psi, the
span shifts as the maximum air volume
setting is adjusted to values that are less
than 100%. The conservative selection of
terminal units will result in reset spans that
are significantly reduced from the nominal
5 psi. For example, a maximum air volume
selection made at 60% capability (1800 fpm
inlet velocity) will result in a reset span in
the order of 1.7 psi. More conservative
selections will result in reset spans that
approach a simple on/off operation.
To minimize the outlined concerns with the
CP100 or CP200 controllers, terminal unit
selections should be made from the upper
25% of the performance range. To eliminate
these concerns completely, consider
the more versatile CP101 controllers as
described earlier on this page.
Performance characteristics of the CP100
controller are illustrated on page F15,