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Boost Mode
Fan Speed Control
Web-site: www.produal.com
Enquiries: T: +358 10 219 9100 E: info@produal.fi
Boost mode can be activated through the MODE
button.The Boost mode can be used e.g. to boost the
temperature in the morning, or increase ventilation on
high CO2 measurement.
The boost mode has Boost Target parameter that
selects the target setpoint that the boost mode applies
to. The target options are:-
•
Temperature Setpoint (default)
•
CO2 Setpoint
•
Humidity Setpoint
•
Dehumidity Setpoint
•
Fan Demand
•
Aux Setpoint
In addition the Boost Mode has boost target setpoint
(as default 25.0). When the Boost mode is activated the selected setpoint is changed to the Boost
Target. E.g in case of temperature heating boost, the target setpoint is increased. In case of CO2
boost the CO2 target setpoint is reduced.
Boost Mode has also built in timer. By setting the Boost Time to 1 to 480 minutes, this is the maximum
Boost time. By setting the Boost Time to 'Permanent' there is no maximum Boost Time.
The boost mode continues to run until Maximum Boost Time has been reached, or if the
Measurement reaches the Boost Target.
NOTE: The target for the temperature boost can be above or below the current setpoint. The fan
boost target level is selectable between 1-100%.
The Boost Mode is also cancelled when the time reaches the next switching point on the 7-Day
schedule point regardless of the Boost Time or Current Measurement. Please note that at the next
switching time the target (COMFORT/ECO/OFF/BOOST) must be different from the target in the
current period in order to time to count as switching point.
NOTE: Digital Input can also be configured to activate the Boost.
Fan speed control logic adjusts the fan speed based on the demand from 0% to 100%. The fan speed
can be configured to follow different control loop outputs using the Fan Speed Source configuration
parameter. The options are:-
•
HEATING 1 AND COOLING 1 STAGE (Default)
•
HEATING STAGE 1
•
COOLING STAGE 1
•
HEATING AND COOLING STAGE 2
•
HEATING STAGE 2
•
COOLING STAGE 2
•
CO2 LOOP
•
HUMIDITY LOOP
•
DE-HUMIDITY LOOP
•
MAXIMUM VAV; Maximum of Cooling Stage 1 and CO2 Loops
•
MAX TEMP/HUM; Maximum of Heating Stage 1, Cooling Stage 1 and Humidity Loops
As default the fan speed control is configured to follow the Heating and Cooling Stage 1. This means
that e.g. if Heating Stage 1 output is 55%, and the minimum fan level is set to 0%, the fan speed loop
output is also 55%.
Minimum Fan Level parameter is used to set the minimum fan speed during the operation in
COMFORT mode. The fan demand is scaled between the Minimum Fan Level and Maximum (100%)
- see diagram below for example. The fan speed is 0% in the deadzone area unless Fan Off Delay is
set to 0 = Indifinite (default - the fan remains at Minimum Fan Level in deadzone area).
EC FAN CONTROL EXAMPLE
Fan Speed Source = Htg/Clg Stage 1
100%
40%
20%
0%
-
Dz = Comfort Deadzone
calcSP = Calculated Setpoint
BOOST MODE
INDICATED BY
THE BOOST
BUTTON
BOOST
TARGET
TEMPERATURE
(IF TEMP
BOOST)
Fan Speed, Min Level = 40%
Fan Speed, Min Level = 20%
Min. Fan Level = 40%
Min. Fan Level = 20%
calcSP
Dz
Copyright © 2020 Produal Oy - All rights reserved - 07/2020
Produal Oy
Target
25
°C
.0
AUTO
Room
20
°C
.1
+
MEASURED
TEMPERATURE
PS 6001TRC-P - 11/34
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