Wiring; Contact Modes/Actions; Troubleshooting; Controller Does Not Hold Setpoint Pressure - Loren Cook Vari-Flow Specification And Installation Instructions

Wiring

We strongly recommend that each product be wired to a separate grounded transformer and that the transformer shall service
only these products. This precaution will prevent interference with and/or possible damage to incompatible equipment.

Contact Modes/Actions

Direct Acting
OFF
-
K = Open
nc
K = Closed
no
Reverse Acting
OFF
-
K = Closed
nc
K = Open
no
Legend
Dashed = Open
Solid = Closed
Limited Warranty
Loren Cook Company warrants that your Loren Cook fan was manufactured free of defects in materials and workmanship, to the extent stated herein. For a period of one (1)
year after date of shipment, we will replace any parts found to be defective without charge, except for shipping costs which will be paid by you.
This warranty is granted only to the original purchaser placing the fan in service.
This warranty is void if the fan or any part thereof has been altered or modified from its original design or has been abused, misused, damaged or is in worn condition or if the fan
has been used other than for the uses described in the company manual. This warranty does not cover defects resulting from normal wear and tear.
To make a warranty claim, notify Loren Cook Company, General Offices, 2015 East Dale Street, Springfield, Missouri 65803-4637, explaining in writing, in detail, your complaint
and referring to the specific model and serial numbers of your fan. Upon receipt by Loren Cook Company of your written complaint, you will be notified, within thirty (30) days of our
receipt of your complaint, in writing, as to the manner in which your claim will be handled. If you are entitled to warranty relief, a warranty adjustment will be completed within sixty
(60) business days of the receipt of your written complaint by Loren Cook Company.
This warranty gives only the original purchaser placing the fan in service specifically the right. You may have other legal rights which vary from state to state.
For fans provided with motors, the motor manufacturer warrants motors for a designated period stated in the manufacturer's warranty. Warranty periods vary from manufacturer
to manufacturer. Should motors furnished by Loren Cook Company prove defective during the designated period, they should be returned to the nearest authorized motor service
station. Loren Cook Company will not be responsible for any removal or installation costs.
VARI-FLOW PRESSURE CONTROLLER IO&M
ON
Pressure
+
Differential
K = Closed
nc
K = Open
no
Pressure
ON
+
Differential
K = Open
nc
K = Closed
no
Corporate Offices 2015 E. Dale Street Springfield, MO 65803
Phone 417-869-6474 Fax 417-862-3820

Troubleshooting

PROBLEM AND POTENTIAL CAUSE

Controller does not hold setpoint pressure

Cause:
∙ Incorrect minimum distance
∙ Kinks or punctures in the tubing.
Corrective Action:
∙ Ensure that the pressure taps are located at a minimum distance
of 1.5 duct diameters upstream or downstream from any dimensional
change, elbow, damper, or other obstruction.
∙ Verify and ensure that there are no kinks or punctures in the tubing
between the Pressure Controller and the pressure taps.
Unstable Fan Speed
Cause:
∙ Kinks or punctures in the tubing.
∙ Response Speed set too high.
Corrective Action:
∙ Verify and ensure that there are no kinks or punctures in the tubing
between the Pressure Controller and the pressure taps.
∙ Adjust the response speed from the Programming Menu (see Step
3 - Programming).
LorenCook.com
4
DECEMBER 2018
B51004-002