COOK Constant Pressure Control System - Manual

®
This installation manual provides information for
installing and configuring the Loren Cook Company
constant pressure control system. The system requires
a Loren Cook Company fan with an Electronically
Commutated, EC, motor with external speed control
capability. The manual does not cover any other
installation details or applications.
Carefully read this publication and any
supplemental documents prior to any
installation or maintenance procedure.
For additional safety information, refer to AMCA
publication 410-96, Safety Practices for Users and
Installers of Industrial and Commercial Fans. This
document and all Cook publications may be obtained
from Cook by phoning (417) 869-6474, extension 166; by
FAX at (417) 832-9431; or by e-mail at info@LorenCook.
com. All Cook publications are available on LorenCook.
com.
For information and instructions on special equipment,
contact Cook at (417) 869-6474.
Receiving and Inspection
Carefully inspect the constant pressure control
system and accessories for any damage and shortage
immediately upon receipt of the unit.
Storage
If the constant pressure control system is stored for
any length of time prior to installation store the unit in
its original crate and protect it from dust, debris and the
weather.
Installation
Pressure Tap
The pressure tap is intended to be located in the duct
of the system you want to control. The location is to be
determined by the Engineer that designs the system.
Loren Cook recommends that the tap be located at least
1/3 of the distance from the bottom of the duct.
The pressure tap is mounted per the instructions
included in its packaging.
Control Box
The control box should be mounted vertically in a
location that is accessible for operating and configuring
the controller. The control box is provided in a NEMA-
3R configuration that would allow you to mount it in an
outdoor location. The control box should be located
within 100 feet of the fan.
To ensure good response time of the pressure
transducer, the control box should be located within
approximately 50 feet of the pressure tap. If it is not
feasible to locate the control box within 50 feet of the tap,
it may be necessary to re-locate the pressure transducer
Constant Pressure Control System
For electronically commutated motors
Installation and Operation Manual
from within the control box to a location closer to the
pressure tap. It will be necessary to run the wires from
the new pressure transducer location to the control box
as required. The transducer should be located within 100
feet of the control box.
Connect the pressure transducer, either in the control
box or remote mounted, to the pressure tap located in the
system duct using ¼ inch tubing. Depending on whether
the duct is operating under a vacuum or is pressurized,
the tube from the pressure tap will be connected
differently.
• Vacuum:
Connect the tubing to the low connector on the
pressure transducer and leave the high connector
open to the atmosphere. If the control box is not
located in a location that will represent the control
pressure, it may be necessary to use a second
pressure tap and connect the high connector to the
second tap located in the control location.
• Pressurized:
Connect the tubing to the high connector on the
pressure transducer and leave the low connector
open to the atmosphere. If the control box is not
located in a location that will represent the control
pressure, it may be necessary to use a second
pressure tap and connect the low connector to the
second tap located in the control location.
Wiring
See page 2 for the wiring diagram.
Connect the 115 volt power to the disconnect switch,
by others, and then connect the disconnect switch to both
the motor AC power leads and the input connections for
the control box per the wiring diagram.