Installation, Operation, & Maintenance for CRFF-E Series
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Krueger | 1401 N Plano Rd | Richardson, TX 75081 | 972.680.9136 | [email protected] | www.krueger-hvac.com
Technical Notes (continued)
Designs with Duct Collar, VAV or constant air box and fan coils
For applications requiring powered fan filter units and a ducted connection
our recommendation would be to use FFD, FFDR, or FFDRA units equipped
with PSC motors.
Caution
FFDE, FFDER, and FFDERA units are not recommend for use with ducted
systems, and cannot operate with inlet static pressure exceeding 0.30
in wg.
For applications when you use a VAV box or Constant Airflow Terminal,
Duct Collars or Fan coils. The design engineer must advise the contractor or
air balancer that the air supply needs to be balanced. If you do not balance
the air supply properly you have the potential to starve or over feed the
fan with air causing the motor to stall which can damage the fan motor.
This also can be minimized by notifying Titus beforehand for assistance.
The ECM motors used in the FFDE, FFDER, and FFDERA designs are a
Microprocessor controlled motor and are designed to maintain a constant
air volume. When two controllers are compensating the air volume at the
same time, the motor microprocessor is unable to stabilize the airflow and
will shut itself down if it cannot find a stable operating point.
In addition to properly balancing the airflow to the Fan, you should
prepare a sequence of operations turning on FFU’s prior to energizing the
Air Handler to prevent potential backward rotation of the blower wheel
which can prevent motor rotating in the proper direction and will reduce
airflow and cause eventual shutdown. The drive components inside the
ECM motors are self-testing and sized for the motor being used inside the
unit they can’t compete with the airflows from a duct blower motor.
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