Troubleshooting; Warranty - Greenheck Vari-Green Control Installation, Operation And Maintenance Manual

Troubleshooting

Problem
Not holding setpoint pressure
Fan Speed is unstable
Fan Cutout not working properly

Warranty

Greenheck warrants this equipment to be free from defects in material and workmanship for a period of
one year from the shipment date. Any units or parts which prove defective during the warranty period will
be replaced at our option when returned to our factory, transportation prepaid. Motors are warranted by
the motor manufacturer for a period of one year. Should motors furnished by Greenheck prove defective
during this period, they should be returned to the nearest authorized motor service station. Greenheck
will not be responsible for any removal or installation costs.
As a result of our commitment to continuous improvement, Greenheck reserves the right to change
specifications without notice.
Phone: (715) 359-6171 • Fax: (715) 355-2399 • E-mail: gfcinfo@greenheck.com • Web site: www.greenheck.com
8
Potential Solution
Check that pressure taps are a minimum of 1.5 duct diameters upstream or
downstream from any dimensional change, elbow, damper or other obstruction.
Make sure there are no kinks or punctures in the tubing between the Constant
Pressure Control and the pressure taps.
Make sure there are no kinks or punctures in the tubing between the Constant
Pressure Control and the pressure taps.
Try algorithm gain set A or B.
A cutout percent value is only valid for a discreet pressure set point. When the
pressure set point is changed, the cutout percent value must be adjusted as well. It is
recommended that you make sure your pressure set point is correct before
continuing.
If the controller will not shut the fan off, verify that the cutout value is correct and that
the timer has started by looking for the flashing LED. If the flashing LED is not
displayed, then the cutout value needs to be adjusted. Remember the cutout value
should be set when there is no demand on the system.
If the controller shuts the fan off when there is demand on the system, the cutout
value is too high. Lower the value and observe the operation of the system.
Greenheck Vari-Green Motor catalog provides additional
information describing the equipment, fan performance,
available accessories, and specification data.
AMCA Publication 410-96, Safety Practices for Users and
Installers of Industrial and Commercial Fans, provides ad-
ditional safety information. This publication can be obtained
from AMCA International, Inc. at: www.amca.org.