Growcontrol GROWBASE User manual

Halle 404
Gwinnerstr. 46
60388 Frankfurt – Germany
Mail: [e-mail]
Web: www.growcontrol.de
Instruction Manual
GROW BASE
•Multifunctional digital climate controller with timer functions
and CO₂control
•For AC and EC fans

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Dear customer,
Thank you for choosing one of our products. Our name stands for innovative and reliable
products that always guarantee the best conditions for your plants. We know how closely the
environmental conditions in which you grow your plants are associated with the end result.
We hope that you enjoy using this product!
•Please read these instructions carefully and observe the relevant information.
•Store this instruction manual and make it accessible to all users.
•Ensure that you include this instruction manual when handing over the device to third
parties.
With kind regards,
GrowControl
Changes in the device’s firmware can cause changes in the manual.
Please make sure to use the manual that suits to the firmware that is installed on your
device.
A list of the changes is published with a new firmware version.
If firmware changes cause changes in the manual, this will be mentioned in this list.
An overview of the history of this manual can be found at the end of the document.

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Table of contents
1. Safety instructions ......................................................................................................................................... 4
2. Specified normal operation.......................................................................................................................6
3. Device description ......................................................................................................................................... 7
4. Initial use..........................................................................................................................................................10
5. Menu overview..............................................................................................................................................11
6. Operation.........................................................................................................................................................12
7. The particular functions and menu sections in detail..................................................................13
7.1 Info level...........................................................................................................................................................13
7.2 Climate ..............................................................................................................................................................15
7.3 CO2.....................................................................................................................................................................16
7.4 Ventilation .......................................................................................................................................................18
7.5 Timing ...............................................................................................................................................................21
7.6 Lights .................................................................................................................................................................22
7.7 Advanced setup ............................................................................................................................................23
7.8 System setup..................................................................................................................................................23
7.9 Multifunctional Out.....................................................................................................................................26
7.10 Firmware update ..........................................................................................................................................26
8. Appendix..........................................................................................................................................................27
8.1 Appendix advanced settings...................................................................................................................27
8.2 Port Lights 0-10V / Multi Out 5 .............................................................................................................30
8.3 Pin connection for EC fans.......................................................................................................................31
9. What to do if there are problems?.......................................................................................................31
10. Technical data................................................................................................................................................32
11. Disposal ............................................................................................................................................................33
12. Service...............................................................................................................................................................33
13. Warranty...........................................................................................................................................................33
14. Revision history.............................................................................................................................................34

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Safety instructions
Please observe the following information besides the safety instructions of this manual. As with
all electrical devices, use this digital environmental controller carefully and cautiously to avoid
hazards due to electric shock.
Electric shock
Warning!
•Please note that the integrated power sockets of the device are enabled once the device
is connected to an electrical supply.
•Only operate the device at the voltage indicated on the device.
•Do not connect defective equipment to the device.
•Protect yourself from electric shock by avoiding body contact with earthed or grounded
surfaces such as pipes or radiators.
•Check all device parts including the power cable and extension cables as well as plug
connections for their proper condition prior to each use. Check the proper status of all
parts connected to the device. Do not use the device if it is damaged.
•Do not pull on the cables to disconnect the plug from the power socket. Hold the device
plug sockets with one hand while removing electrical equipment by pulling the plug.
•Do not use the device if it has sustained a fall or if water has penetrated the device interior.
•Do not use the unit during a thunderstorm.
•In the event of defects or operational faults, switch off the device immediately and
disconnect it from the power socket.
•Never hold or carry the device by the power or sensor cable.
•Maintain a distance between all device parts and warm surfaces.
•Only use the unit in dry and heated rooms.
•Never reach for a device that has been submerged in water. In such cases, pull the plug
out of the power socket immediately.
•Do not subject the device to any impact or drop the device.

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Repairs
Warning!
•Do not open the device.
•Only specialist personnel may perform repairs on electrical devices. Improper repairs may
subject users to considerable danger. For repairs, please contact our customer service or
an authorized customer service point.
•If the device or parts of it are damaged, it must be repaired by the manufacturer or an
authorized customer service point.
Risk of fire
Warning!
•There is a risk of fire if the device is used improperly or these instructions for use are
ignored!
•Never use the device near highly flammable substances.
Operation
Warning!
•The device is only intended for the purpose described in these instructions. The
manufacturer is not liable for damage resulting from improper or careless use.
•Do not connect any technical equipment that exceeds the maximum output indicated on
the device or according to this instruction manual.
•Specifications concerning maximum power output are meant to be nominal power output
(no “dimmed power” at controlled outputs).
•Do not place any objects on the device.
•Do not expose the device to high temperatures.

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Specified normal operation
This digital environmental controller is designed for speed controlling of fans and switching a
number of other devices. In addition, lights with a 1-10V/1-10V input can be dimmed.
Depending on the mode of operation, the controller’s power sockets may be used for
connecting devices below:
•Power sockets „Multifunctional Out 1-4“:
ohumidifier/ dehumidifier
olights*
oirrigation pumps
ocirculation fans
oCO₂valves/ generators (230V)
oheating mats
ochillers
oRegular duct fans with running capacitor*
The following devices can be connected to the laterally RJ45 jacks:
•RJ45 jacks „In/Out“:
ohumidity and temperature sensor (shipped with the controller)
oCO₂sensor (CarbSense)
onegative pressure sensor (PresSense)
otemperature sensor for heating matt
•RJ45 jacks „EC-Fans“:
ovoltage controlled EC fans
•RJ45 jack „Lights 0-10V“:
olights with 0-10V/1-10V input
orelays/ contactors 12-24V
The device is not suitable for controlling any other equipment.
The mains cable of an EC fan may not be connected to a power socked on the controller.
It should be connected to a standard power socked that is always on. The speed control
and switch off is done with the signal from the corresponding RJ45 jack.
Warning!
If the “intake” mode is selected for the “Multifunctional Out 1-4” output, only standard
fans may be connected. Other devices may be damaged in the “intake” mode. When
shipped, the functions of “Multifunctional Out 1 and 2” are set to “intake” and “exhaust”.
To meet the European EMC directive, the technique used to control the regular duct fans
may be used up to a maximum 600W. Do not connect devices with a power above 600W
in “intake” or “exhaust” mode.
Always ensure that the maximum output power of the individual outputs is not exceeded.
Please find further information on the device’s label or chapter 11of this manual.
Avoid exposing the temperature and humidity sensor to humility above 95% RH as the
sensor may become damaged.
Do not connect fans with an integrated rpm control. (e.g. temperature controlled)
*The sockets of GROW
BASE are not optimized for switching LED luminaires or energy-saving
lamps. To guarantee that the luminaires are completely switched off, the 4th socket of the
GROW
BASE PRO controller should be used for LED luminaires or energy-saving lamps.

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Device description
The digital climate controller GROW BASE
•is the control station for the ambitious indoor gardener. A number of different devices
and sensors can be connected, which guarantees maximum flexibility.
•is similarly able to control standard duct fans as well as EC fans, offering maximum
flexibility.
•keeps the grow room temperature at the desired value by varying the air flow of the
fans.
•keeps the humidity in the grow room at the designed value by switching a humidifier or
dehumidifier.
•can additionally reduce the humidity in the grow room by increasing the air flow.
•can be updated via the USB port.
•brings a 24h timer for switching lights, an interval timer with separate settings for day
and night as well as multiple event timers.
•has a battery powered real time clock to keep track of time even if the controller is not
connected to the mains supply.
•can dim compatible lights using a 0-10V/1-10V signal. Ramps for sunrise and sunset can
be configured.
•is equipped with four programmable power sockets.
•has a transistor output (MOSFET) that can be used for switching external DC relays or
contactors.
•is able to control the CO₂level in the grow room with a CO₂sensor CARB
SENSE
connected.
•is able to calibrate the connected CO₂sensor.
•ensures a constant negative pressure in the grow room, avoiding the escape of odours
from the grow room. To maintain an accurate negative pressure, a pressure sensor
PRES
SENSE can also be connected.
•uses the current sensor values to calculate the values expected in the future. This enables
the controller to react precociously to changing sensor readings.
•is able to regulate the temperature and humidity as precisely as ±0.5°C/±1% RH. *
•uses well-tuned PID algorithms for controlling the environmental conditions.
•can control the temperature of a heating mat. The temperature can be set to a certain
value or a temperature relative to the room temperature. (individual for day/night)
•is equipped with an easy-to-use multilingual (English, German) menu. Many different
setups can be achieved, e.g. adjusting the minimum and maximum fan speed separately
for day and night. It offers a range of information including the current temperature, CO₂
concentration, current humidity, min/max temperature values and humidity, current fan
speeds and other information regarding the operating condition.
•saves the settings permanently to ensure that they remain available after a power
breakdown or after the controller has been temporarily out of use.

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•can be mounted to a wall with the included screws, dowels and drilling template.
*Provided that the sizing of the connected utilities is appropriate and the fresh air temperature is sufficiently
low. The tolerance is related to the repeat accuracy rather than the absolute accuracy. The absolute accuracy
is ±2%.

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9
10
2
7
8
14
11
3
13
4
1
5
6
12
1Display
2Rotary switch
3RJ45 jack for 0-10V/1-10V dimming of lights and Multifunctional Out 5
4RJ45 jack for exhaust EC fan
5RJ45 jack for intake EC fan
65xRJ45 jack for sensors and PowerExtenders
7USB-A Port for firmware updates
8-11 Programmable power socket Multifunctional Out 1-3
12 Mains cable
13 Hanger for the sensor
14 Digital sensor for humidity and temperature

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Initial use
Warning!
If “intake AC” or “exhaust AC” mode is selected for an “Multifunctional Out 1-3“output, only
standard duct fans may be connected. Other devices may be damaged in the modes “intake
AC” or “exhaust AC”. When shipped, the functions of “Multifunctional Out 1 and 2” are set to
“intake AC” and “exhaust AC”.
1. Place the humidity and temperature sensor (14) in an appropriate position inside the grow
room, usually at the top ends of your plants. Please use the sensor hanger supplied (13). The
sensor should not be exposed directly to the fog stream of the humidifier. Connect the
humidity and temperature sensor to any of the RJ45 jacks labelled “In/Out” (6).
2. Connect the mains plug (12) to the power supply (regular power socket).
3. Set the function of the “Multifunctional Out 1-5” outputs and set up all other functions
according to your requirements.
4. Connect the EC fans to the RJ45 jacks labelled “intake” and “exhaust” (4),(5) using a suitable
cable.
5. Connect other accessories (sensors, lights with 0-10/1-10V etc) to the RJ45 jacks.
6. Connect appropriate devices to the other power outputs.
For AC fans, we recommend disconnecting the mains plug (12) first. Subsequently, connect
the fans to the corresponding power sockets on the controller and then reconnect the mains
plug.
Always ensure that the maximum output power of the individual outputs is not exceeded.
Please find further information on the device’s label or section 10 (Page 32) of this manual.
Avoid exposing the temperature and humidity sensor to moisture and humility above 95% RH
as the sensor may become damaged.
EC fans have their own power supply cable, which should be plugged to a regular power
socket (always on). It should not be connected to a power socket on the climate
controller. The fan’s rpm control and turn off is made via the signal cable from the RJ45
jack on the controller to the EC fan.

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Menu overview
„Setup“
Info
1
Start
Climate
setup
2
System
setup
8
Advanced
setup
7
Cancel &
return home
Save &
return home
Save &
apply
Lights
setup
6
Timing
setup
5
Ventilation
setup
4
CO2
setup
3
Multi Out-
setup
9

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Operation
The controller is operated via a menu, which is divided into two levels. It is controlled by turning
or pressing the rotary switch (2).
•On level “Info”, different information is displayed.
•On level “Setup”, all settings can be configured. This level is grouped in different
topics.
In the right area of the display, currently available menu options are displayed by these
symbols:
FEnter (press)
BC Go to next menu page (rotate)
kChange value (rotate)
iInfo screen
Press the rotary switch a bit longer* and then release it in order to jump from any “setup
screen” to the screen „Save&Apply”.
If the rotary switch is pressed again, the changed settings will be saved and applied and the
previous screen will be displayed.
To jump from the level “Info”directly to the level “Setup”press the rotary switch a bit
longer* and then release it while an “Info”screen is displayed.
*Longer than half a second but shorter than 4 seconds.
The changing of a certain setting is explained below with the desired humidity value during
daytime as an example:
1. In the menu in section “climate setup”,
choose the screen “Set desired RH
day”.In order to get to this screen
starting at the home screen, follow
these steps:
a. Rotate the rotary switch one step
CCW (counter clock wise). “Press to
enter setup” is displayed.
b. Press the rotary switch. „Climate
setup” is displayed.
c. Press the rotary switch. The following
screen is displayed:
2. Press the rotary switch. Now the
symbol kappears and the value to be
set blinks.
3. Choose the desired value by turning
the rotary switch.
Set desired RH F
dayC 65A BC
Desired DF
RHC65AE

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4. Enter the chosen value by pressing
the rotary switch.
In order to save the changes made, there
are two options:
1. Press the rotary switch a bit longer*
and then release it in order to jump to the
screen “Save & Apply”.If the rotary
switch is pressed again, the changed
settings will be saved and applied and the
previous screen will be displayed.
*Longer than half a second but shorter
than 4 seconds.
2. Go to the screen “Save & return home”,
and press the rotary switch in order to save
the changes. Afterwards
will be displayed.
The particular functions and menu sections in detail
Info level
In this section different information like current sensor readings, fan speeds and information
regarding the operation condition is displayed.
This screen is the home screen. It shows
the current temperature (Temp) and
relative humidity (RH).
This screen shows the current CO₂
concentration detected by the CO₂sensor
(available as an accessory).
ppm = parts per million
This screen shows the current negative
pressure (vacuum) detected by the
pressure sensor (available as an accessory).
Pa = Pascal).
This screen shows the current temperature
detected by the additional temperature
sensor. This function is designed for
controlling a heating mat. It also can be
used for controlling the temperature of a
water tank (this temperature sensor is
achievable as an accessory).
This screen shows the minimum and
maximum humidity values (RH) that have
occurred since the last reset.
Desired DF
RHC72AE
Desired F
RHC72ABC
RHC60.7Ai
TempC24.8ACBC
CO2 concentr.C i
1589ppm BC
Neg. PressureCi
7pa BC
T heating matCi
28.8ACBC
RH MINC58.4Ai
RH MAXC61.8ABC

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This screen shows the minimum and
maximum temperature values (T) that have
occurred since the last reset.
To reset the saved minimum and maximum
values, press the rotary switch while this
display is shown. After resetting, the home
screen will be displayed.
If the desired CO₂concentration cannot be
achieved within 45 minutes, this suggests
that there is a problem with the CO₂
supply, such as an empty CO₂bottle.
The higher temperature in CO₂mode could
be harmful for your plants without a
sufficient CO₂concentration. Therefore,
the controller will switch to the regular
“day mode”without CO₂dispensing and
the warning “check CO2 supply” will be
displayed.
To delete the warning and return to
operation in CO₂mode, press the button
while this screen is displayed.
These screens show the current fan speed
of the EC fans. The “percent value”
represents the power transmitted to the
fan. The “rpm value” represents the fan’s
actual rpm. The rpm value is not
transmitted from all EC fans. The rpm value
can only be displayed if the corresponding
signal is transmitted by the EC fan and is
supported by the cable. The cable must
have at least 4 wires to support this
function. The rpm value is for information
only and has no influence to the function.
rpm = revolutions per minute
The screens Multi Out 1 to Multi out 5
display the function that is assigned to
each power socked or the DC output (Multi
Out 5). Also, the current state of each
output is displayed. If one or more
PowerExtenders are connected, the
number of available outputs is increased
accordingly.
This display informs about the current
state of the interval timer. It indicates
whether the next switching is ON or OFF
T MINC24.6AC i
T MAXC26.3ACBC
Press for F
reset MIN/MAX BC
Press to reset F
CO2 warning BC
Intake ECCi
2510rpm 62ABC
Exhaust ECCi
2139rpm 72ABC
Multi Out 1C i
Intake AC 62ABC
Interval ON i
inC00C07C56 BC

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and how long it takes until the next
switching.
This display shows the current percentage
with which a light, that is controlled via the
0-10/1-10V interface, is lit. (dimming)
This display shows the system's current
time and whether it is "day" or "night". This
is determined by the times “Start of day”
and “End of day”.
If the CO₂control is active, "CO2" is
displayed here. The CO₂mode is only
active during the day.
This display shows the remaining time for
switching an output for which the function
“interval” is selected to switch-on or
switch-off.
This screen shows the current desired value
for the room temperature. When a change
between day/night/CO₂occurs, the
transition to the new temperature setpoint
is done slowly following a ramp.
Additional information can be found in the
appendix in chapter 9.
To enter menu level “setup”, press the
rotary switch while this screen is displayed
Climate
In this section all setpoints (desired values) associated with temperature or humidity can be
configured. For each temperature or humidity setpoint, a separate value for day and night is
available. The current clock time and the times for “start of day” and “end of day” in section
“timing setup” determine when the controller is working in day mode or in night mode.
RH (Relative humidity): These settings define when a humidifier or dehumidifier is switched on
or off. Depending on the settings for the dehumidification mode, the exhaust airflow can be
increased and a heater can be switched on in order to decrease humidity.
Setpoint temperature: These values set here define the desired temperature values for
controlling the air temperature by the exhaust (and intake) fans.
The sensor readings that are relevant for previously mentioned functions are captured by the
supplied sensor for relative humidity and temperature.
Lights infoCi
62ABC
12C34C56 i
ModeC day BC
DateCi
02.05.2020 BC
Desired temp i
infoC 27.0ACBC
Press to F
enter setup BC

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Temperature heating mat:These values define the setpoint for the temperature control of a
heating mat. The sensor reading relevant for this function is captured by a sensor available as
accessory.
Chiller:An output configured as “Chiller” (Multifunctional Out 1-5) is switched on if the
desired room temperature is exceeded by 2°C and is switched off if the room temperature is
1°C below the desired room temperature.
Set the desired humidity value (RH).
Separate values for day and night are
available.
Set the desired temperature values (T) for
the room air. Separate values for day and
night are available.
Set the temperature for a heating mat
here. You can set a fix temperature or a
temperature relative to the ambient
temperature.
“fix” means a fixed temperature
“amb +” means a temperature relative to
the ambient temperature.
Separate values for day and night can be
set.
When the desired humidity (RH) is
exceeded, depending on the selected
mode the fan speeds can be increased. This
will extract the humidity from the grow
room, given that the humidity of the fresh
air is lower when inside the grow room.
This function is independent of whether a
humidifier or dehumidifier is connected to
one of the power outputs.
Three modes are available:
Medium – When the desired humidity is
exceeded by 10% RH, the air flow will be
increased. A deviation of 1.5°C compared
to the desired temperature will be
tolerated.
High - When the desired humidity is
exceeded by 5% RH, the air flow will be
increased. A deviation of 3°C compared to
the desired temperature will be tolerated.
Off – The airflow will not be increased
when the desired humidity is exceeded.
CO2
In this section the settings for the CO₂control can be configured.
With our CO₂sensor CARB
SENSE , the CO₂concentration of the room air can be controlled.
The CO₂dosing can be done by using a CO₂bottle or by using a CO₂generator. The CO₂
dosing is done during daytime only.
On basis of the settings, the control algorithm calculates how long the CO₂valve has to be
opened or how long a CO₂generator has to be switched on in order to reach the desired CO₂
Set desired RH F
dayC 65A
Set desired T F
dayC 65A
T h-mat dayC F
fix 28ACBC
Set dehumid F
modeC lowBC

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level. In addition, the algorithm is continuously learning from the previous cycles to reach the
desired CO₂as precise as possible.
The settings “room volume” and “CO₂flow” are used as a starting point.
The minimum and maximum fan speeds for the CO₂period can be set individually. It is
recommended to keep the airflow low to avoid wasting CO₂. In addition, the room should be
well sealed.
To ensure an even distribution of CO₂, good air circulation inside the room should be
maintained.
Here the CO₂function can be enabled or
disabled.
Set the desired CO₂concentration here.
(ppm = parts per million)
Set the room volume here.
Unit: (length * height * width) m*m*m = m³
Enter the flow set on the CO₂armature or
specified for your CO₂generator.
Unit: l/min = litres / minute
The table below can be used as rough
reference for the CO₂flow.
Room volume
CO₂flow
< 10 m³
8 l/min
10-20 m³
10 l/min
20-50 m³
15 l/min
50-100 m³
20 l/min
> 100 m³
25 l/min
Enter the specified maximum air flow of
your exhaust fan(s) according to the
manufacturer.
With this setting the controller knows how
much air is extracted from the room in a
certain period of time at the current fan
speed. The CO₂amount is increased
accordingly.
Set the desired temperature for CO₂mode.
When this temperature is exceeded, the
fan speeds will be increased as long the
following MIN/MAX settings allow.
CO2 functionC F
ON at daytime BC
Concentration F
CO2C 1200ppmBC
Room volumeCF
18.0ml3BC
Flow F
CO2C10.0l/minBC
Exhaust @ 100AF
1450m3/hBC
Set desired F
tempCO2 32.0ACBC

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Set the maximum fan speed of the exhaust
fans during the “CO₂period”. This fan
speed will never be exceeded.
Set the desired temperature for CO₂mode.
When this temperature is exceeded, the
fan speeds will be increased until this value
is reached.
Set the minimum airflow of the exhaust fan
during the “CO₂period”. This fan speed will
never* be undercut.
*during pressure, sensor calibration is in process,
all fans are turned off.
The minimum fan speed is 10%.
Additionally, “OFF” can be selected. This
means that the intake fan will be switched
off as long as the measured temperature is
below the desired temperature.
Ensure that the fan is still rotating at the set
minimum fan speed and the airflow is
sufficient for cooling the motor. This
applies for standard duct fans (AC) only.
Set the maximum fan speed of the intake
fan during the CO₂period. The specified
value will never be exceeded.
Ventilation
In this section the minimum and maximum fan speeds and the negative pressure can be set.
Separate values for day and night are available.
The factory settings are a good starting point for many setups. Considerations for the
optimum settings are:
•Reasonable noise of the ventilation system
•Required air exchange to reach the desired temperature
•Recommended operating range of your (carbon) filters
•The balance between intake and exhaust fans regarding the size/flow. This is relevant
for the negative pressure.
Principle of operation:
The fan speed of the exhaust fans is controlled in order to maintain the desired room
temperature. Optionally one or more intake fans can be used in order to forward additional air
into the room. The fan speed of the intake fans is controlled in order to maintain the desired
negative pressure.
If the intake fans run faster at a certain speed of the exhaust fans, the negative pressure
decreases. If the intake fan runs slower, the negative pressure increases.
Without a pressure sensor PRES
SENSE , the speed difference between exhaust and intake fans
is given by the setting “negative pressure %”.
Example: Current exhaust fan speed: 50%
Negative pressure %: 10%
Set exhaust F
CO2 MAXC15ABC
Set exhaust F
CO2 MINCOFFBC
Set intake F
CO2 MAXCOFFBC

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Current intake fan speed = 40%
With a pressure sensor PRES
SENSE , the speed of the intake fans is controlled by a PID
controller to always maintain the desired negative pressure in pascal (Pa).
In this case the value “negative pressure %” provides a limitation of the intake fan speed.
(upper boundary)
Example: Negative pressure in %: 5%
The intake fans will never run faster than “current exhaust fan speed” minus 5% even if the
currently measured negative pressure is above the desired negative pressure (Pa).
EC fans are turned off if they are driven below 10%.
The fan speed of AC fans can’t be decreased without limits. When a certain value is undercut the
fan would not run reliable. How low the fan speed can be reduced, is depending on the particular
AC fan.
To avoid driving the AC fan to low, a value for switch off is defined. This value can be set in
section “advanced setup” at “intake AC turnoff” and “exhaust AC turnoff”.
If at “intake/exhaust MIN/MAX” a value below this setting is entered, the message “AC intake/
exhaust OFF<##!” is displayed. In order to not turn off the corresponding fan, the value for
“intake/exhaust MIN/MAX” must be grater then the corresponding value “AC turnoff”.
If only EC fans are used, “intake AC turnoff” and “Exhaust AC turnoff” can be set to 10% to disable
the message described above.
The minimum fan speed can’t be greater than the maximum fan speed.
Examples:
•If for “exhaust MAX” a value smaller than “exhaust MIN” is entered, “exhaust MIN” is
set to the same value as “exhaust MAX” by the controller. The message “Fan MIN
updated” is displayed.
•If for “exhaust MIN” a value greater than “exhaust MAX” is entered, “exhaust MAX” is
set to the same value as “exhaust MIN” by the controller. The message “Fan MAX
updated” is displayed.
Set the maximum fan speed of the exhaust
fans. This fan speed will never be exceeded.
Separate values for day and night are
available.
Set the minimum airflow of the exhaust
fans. Separate values for day and night are
available.
Pleas pay attention to the explanations
regarding “AC turnoff” at the beginning of
this chapter.
Ensure that the fan is still rotating at
the set minimum fan speed and the
Set exhaust F
day MAXC100ABC
Set exhaust F
day MINC50ABC

Instruction manual 1.0.0 rev1 en
GROW BASE
20
airflow is sufficient for cooling the
motor. This applies for standard duct
fans (AC) only.
Set the maximum fan speed of the intake
fans. Separate values for day and night are
available.
To avoid the fans running on full speed
with only a small exceedance of the desired
temperature, an allowed deviation can be
set.
The actual fan speed within this allowed
deviation depends on the minimum and
maximum fan speeds set on the previous
screens.
Some other manufacturers call this
function hysteresis.
This setting has two different meanings
depending on whether a pressure sensor is
connected:
Without a pressure sensor connected:
With different fan speeds of the intake and
exhaust fans, a negative pressure is
maintained inside the room, which avoids
the escape of odours from the grow room.
With this value, the amount of negative
pressure can be set. Furthermore, the
intake and exhaust fans can be balanced if
different fans are used. For example, if a
value of 10% is set, this means that the
intake fan will always turn 10% less
compared to the exhaust fan.
With a pressure sensor connected:
The setting limits the speed of the intake
fan compared to the exhaust fan. For
example, with a value of 0%, the intake fan
will at a maximum go as fast as the exhaust
fan. With this setting, having positive
pressure can be avoided in case of an
inappropriately calibrated pressure sensor.
Set the desired negative pressure in Pa.
This setting is only relevant when a
pressure sensor is connected.
Pa = Pascal
One Pa is equivalent to the pressure
difference of approximately 7cm altitude in
the earth atmosphere.
Press the button while this screen is shown
to calibrate the pressure sensor. During
calibration (which takes about one minute_
all fans will be turned off. Further
information can be found in the pressure
sensor’s manual.
If “ON” is selected, the pressure sensor will
be automatically calibrated 10 minutes
before the “day period” starts (only when a
pressure sensor PRES
SENSE is connected)
Set intake F
day MAXC50ABC
Deviation rpm F
reducedC0.2ACBC
Set negative F
pressureC10ABC
Set negative F
pressureC5PaBC
Cal. pressure F
sensor BC
Auto calibr.CF
ON BC