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1
To comply with California Title 24 the “Fan Circulation Time”
must be set to a minimum of 30 minutes.
5.
Pre-occupancy Ventilation – During the 1-hour period
immediately before the building is normally occupied a schedule
entry can be created with the Fan set to “On”. During this time
ventilation will be delivered based on the “Minimum Damper
Position”.
6.
Demand Ventilation – The Pearl Economizer Controller will
provide demand ventilation when installed with a Pelican
thermostat which has an integrated CO2 sensor (Model TS250
or TS250H).
a. Activation – Ventilation will be provided when the CO2
level exceeds the CO2 set point (default = 800ppm).
Ventilation will start by turning ON the Fan and opening the
damper to the “Minimum Damper Position.”
b. Advanced Logic – If the CO2 level continues to increase
above the CO2 set point, the damper will open further until
reaching the Maximum Ventilation Position (default 100%)
open at CO2 level of 1500ppm. The Damper position will be
continuously modulated to maintain CO2 levels below
1000ppm.
c. Supply temperature restriction – The damper opening will
be automatically restricted to limit Supply Temperature (
SAT
)
to not exceed the active thermostat set point.
Note:
Heat and Cool set points should be active to keep from
over-heating or over-cooling the conditioned space due to
ventilation from outside air.
