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international.com
Designs, materials, weights and performance ratings are approximate and subject to change without notice. Visit
armstrong
international.com for up-to-date information.
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The following is an example of the effect of changing the voltage signal on an appliance in Load Control mode:
• The operational range of a 399.x fan is 25%–100%
• 0-0.9V = Appliance off
• 1.0V = 25% Fan speed
• 1.3V = 27% Fan speed (3% modulation)
• 4.0V = 49% Fan speed (33% modulation)
• 6.8V = 72% Fan speed (64% modulation)
• 8.9V = 91% Fan speed (88% modu
• 10.0V = 100% Fan speed (100% modulation)
• Each volt = 8.33% fan speed or 11.11% modulation
Set Point Control mode (PS18=2)
When a 0–10VDC input is used for Set Point Control, the range of 0–10VDC corresponds directly to the temperature set point. Contact
customer support for assistance with using this mode.
Start-Up Procedures - continued