Ventilation Faults
All of the Economizer Faults previously listed are also active for
Ventilation. In addition, if the CO2 sensor fails, a fault will be
generated and continuous ventilation will be provided during
occupied hours.
Variable Speed Fan
The Pearl Economizer Controller can control a Variable Speed
Fan or Variable Frequency Drive (VFD).
1.
Activation – This function is only active if the “Variable Speed
Fan” configuration has been turned “On” and fan speeds have
been configured through the management console.
2.
Speed Control – Whenever the thermostat is calling for “Fan”
the Fan Speed Control will be active. The control signal
(
AUX
) is a 0-10 VDC output. Fan speeds are configured as
percentages with 100% equal to 10.0 VDC and 0% equal to 0.0
VDC. The speed control will be set to the configured
setting for the mode of operation (ie. Fan/Ventilation, Heat,
Cool).
3.
Fan Speed Enable – The Fan signal (
G
) can be used to
enable the Variable Speed Drive Controller. It will be energized
any time the system requires the Variable Speed Fan to be
running.
3
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