Seat 819750 User manual

Type A Remote
controller
REF 819750/819751
The remote controller type A is a safety device for monitoring a fixed air flow.
A speed sensor is used to determine the flow rate. An audible and visual alarm is set off in
case of insufficient speed or too high sash height and other malfunctions.
The remote HMI (Human Machine Interface) is used to control the fume cupboard
ventilation and to carry out the necessary adjustments on site.
This controller complies with EN 14175 and RoHS standards.

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Table of contents
1. Presentation .................................................................................................................................... 3
1.1. HMI (Human Machine Interface) ................................................................................................ 3
1.2. CPU (Central Processor Unit)....................................................................................................... 3
1.3. Schematic diagram ...................................................................................................................... 4
1.4. Connector specifications............................................................................................................. 5
2. Installation and mounting ............................................................................................................... 6
2.1. Dimensions.................................................................................................................................. 6
2.2. Positioning on the fume food...................................................................................................... 7
2.3. Cutting template ......................................................................................................................... 8
2.4. Installation tips............................................................................................................................ 9
3. Wiring diagram.............................................................................................................................. 10
4. Adjustment procedure .................................................................................................................. 11
5. Factory reset.................................................................................................................................. 12
6. Test mode...................................................................................................................................... 12
7. Change the audible alarm delay.................................................................................................... 13
8. Error messages (digital display option) ......................................................................................... 13
9. FAQ................................................................................................................................................ 14
10. Maintenance.............................................................................................................................. 15
11. Warranty.................................................................................................................................... 15
02/11/2021

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1. Presentation
The remote type A flow controller consists of a small HMI, easily installed on a fume
cupboard, and a central processor.
1.1. HMI (Human Machine Interface)
1.2. CPU (Central Processor Unit)
Display
(Option)
Green LED: air flow OK
Red LED: insufficient air flow
Orange LED: Sash too high
Yellow LED: Ventilation ON/OFF
Push button: ON/OFF ventilation
Yellow LED: Lighting ON/OFF
Push button: ON/OFF lighting
Orange LED: auxiliary faults
Push button: stop buzzer
VENT1 : ON/OFF
ventilation relay
VENT2 : ON/OFF
ventilation relay
Alarm contact
Light relay
Overtaking sash
contact
aux faults contact
or
night setback
Output 0/10V
Transformer 230v/12v
connector
Speed probe
connector
Push-button
velocity display
Cut the resistance to activate
the night setback mode
Remote HMI
connector

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1.3. Schematic diagram
FAN1 ON/OFF
Motor
power
supply
Switch sash
position
Power
contactor
Velocity probe
Deported HMI CPU box
The type A flow controller is used to control the air flow of a fume hood.
Pressing the ON/OFF ventilation button on the remote interface closes the two relays VENT 1 and VENT 2,
which supplies the fan via a power contactor. It is a fixed flow controller.
A speed sensor permits to measure whether the suction flow is sufficient (≥0.4 m/s) and indicates, the
ventilation status by a green and a red LED.
The remote HMI is used to control the operation of the fume hood and in particular:
-An ON/OFF lighting
-An ON/OFF for ventilation
-An alarm stop button

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1.4. Connector specifications
Alimentation
Electrical transformer 230v/12v 500mA. (delivered with)
VENT1/FAN1
ON/OFF Ventilation relay driving by
Disconnection voltage: 120v
Disconnection current: 0.5 A
VENT2/FAN2
Same VENT1
LIGHT
ON/OFF lighting relay driving by
Disconnection voltage: 220v
Disconnection current: 3 A
ALARM
Relay controlled by alarm activation. Normally open contact
Disconnection voltage: 120v
Disconnection current: 0.5 A
SASH Open
Sash contact which triggers a visual and audible alarm.
IDLE
Auxiliary fault contact which triggers a visual and audible alarm.
This contact can be used to enable night standby mode by cutting
the resistance shown on page 3.

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2. Installation and mounting
2.1. Dimensions
HMI
CPU
Speed sensor
65 mm
40 mm
28 mm
22 mm

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2.2. Positioning on the fume food
You can install the CPU
in the false ceiling of
the fume cupboard.
The speed sensor must be positioned on
the fume hood ceiling in one of the two
positions shown in the diagram.
These locations must be respected so that
the probe is accurate.
Drill a 22mm diameter hole and put the
speed sensor in it.
An adhesive is provided on the sensor to
fix it correctly to the fume hood and
prevent leaks.
Where to install the speed sensor?
Vertical HMI are usually attached to
the side frame of fume hoods.
Horizontal HMI’s can be set at the
user’s convenience.
◌
To comply with EN 14175
standard, you must install a
sash contact.
The sash contact must be fixed so that
it sets off when the sash exceeds
400mm or 500mm.
◌
500mm
The controller is delivered with
a 2,5 meters cable.

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2.3. Cutting template
If you want to install your fume hood controller without the surface bow mounting, you will
need to make the following cuts:
31mm
110mm

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2.4. Installation tips
•Do not install the sensor on the extraction tube above the fume hood
•Avoid installing the sensor in a dead zone of the fume cupboard
•The probe must pass entirely through the fume cupboard ceiling. Otherwise, you
must use a 25mm PVC tube to extend the outlet.
•A speed of 0.2 m/s minimum must be measured through the sensor to ensure proper
operation.
•When adjusting the controller, it is necessary that:
oThe fans are running
oThe laboratory is completely closed (doors, windows, etc.)
oHave an anemometer
•Pay attention to motor connections (star or delta)
Note: For type A controller, no driver is necessary.
230V single phase
power supply
400V three phases
power supply
400V three phases
output
230V three phases
output
DELTA
STAR

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3. Wiring diagram
220v power
supply
ON/OFF
Ventilation
L
N
Motor power
supply
Switch sash position

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4. Adjustment procedure
Alarm threshold setting
Speed display setting (IF DIGITAL DISPLAY MODEL)
If you don't have the digital display option, go straight to the stage
Press 3s
Release
Simultaneously
press
Enter the setting mode: Press for at least 3 seconds on release and press
simultaneously on and shortly. The beeper then sounds twice and the red LED
flashes. You are in the setting mode.
3
Measure the front air speed of the fume
hood with an anemometer. Wait 15 seconds
for the air speed to stabilize before
measuring.
Make this measurement with the sash at
working height.
4
Switch on ventilation with
1
Lift up the sash in high position (400mm or 500mm). Wait 15
seconds for the air speed to stabilize.
2
Sash
opened
6

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5. Factory reset
6. Test mode
“Test” mode confirms that all device functions are operational. To access the “Test” mode
follow the procedure:
Press the push button on the electronic
board for 15 seconds (the buzzer then rings
5 times to indicate that the procedure is
working properly).
This procedure resets the factory settings:
Setpoint and display to 0.5m/s, 7V analogue
output and all relays and LEDs to off.
Press the 3 buttons simultaneously
The buzzer then sounds 2 times.
1
Press the 3 buttons one after the other to check their correct operation:
•The buzzer sounds 3 times to indicate normal operation.
•The buzzer sounds 10 times if the function is faulty.
•
2
Press the push-button on the electronic board to
synchronize the speed reading on the anemometer
and the speed displayed on the controller. One push
increase by 0.1 m/s over a range of 0.3 to 0.7 m/s.
5
After adjustment, a long press on allows to validate the alarm threshold 0.1 m/s below
the speed measured by the controller and to exit the setting mode.
The controller is now ready to use.
6

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7. Change the audible alarm delay
It is possible on the rear face to change the buzzer’s trigger time with the
two switches.
8. Error messages (digital display option)
The controller displays « HI » for a frontal speed greater than 0.8 m/s.
The controller displays « LO » for a frontal speed lower than 0.2 m/s.
The controller displays « PB » in case of speed sensor problem.
ON
OFF
1 = ON: Alarm still active
1 = OFF: Alarm disabled if ventilation is off
2 = ON: delay set at 30s
2 = OFF: delay set at 15s

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9. FAQ
Questions
Solutions
No indicator
Check that the power supply is correctly connected.
The fan does not start
Check that the controllers ON button is fully engaged and that
the yellow light above is on.
Check wiring.
The display shows "PB"
Check that the speed sensor is correctly connected to the
controller.
Turn off and then restore power to the controller.
The light does not illuminate
The controller does not provide power, it provides a normally
open contact. The light must be connected in the same way as if
it were controlled by a switch.
The frontal speed is
insufficient
Check the direction of rotation of the motor. Check that the
system of installation is correct.
Front speed is too high
Check that the sizing of the installation is correct.
The display shows “8.8.8”
You are in Test mode: see the settings on page 12 to exit this
mode.
Green LED is on and red LED
is flashing
You are in setting mode: see pages 11-12 to exit this mode.
The alarm often sounds after
a short time
Change the alarm delay with the CPU switches: see at the top of
this page.

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10. Maintenance
•Do not use abrasive materials.
•Avoid splashing liquid on the plastic box.
•Do not install the sensor on the extraction tube above the fume hood.
•Do not install the sensor in a dead zone of the fume hood.
•The sensor must not be subjected to air flow disturbances.
•The sensor must lead to the laboratory pressure.
•When setting up the controller, it is necessary that:
oThe fan is running
oThe lab must be completely closed (doors, windows, etc.)
oHave an anemometer
11. Warranty
SEAT Ventilation guarantees that its equipment, products and parts are free from
manufacturing defects under normal conditions of use for a period of two years after delivery
to the first user. If a factory return is required during the two years period from the date of
purchase, contact your distributor. Products must be returned to the point of purchase with
a dated invoice.

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SEAT VENTILATION SAS
PARC TECHNOLOGIQUE DELTA SUD
09340 VERNIOLLE
France
E-mail: [email protected]
Site Web: www.seat-ventilation.com