5
ADJUSTABLE COVER PLATES
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OPERATION
User Manual
ELECTRONIC THERMOSTATS
Read all instructions carefully
INSTALLATION
4
KEO-B REMOVAL
3
WIRING DIAGRAMS
PACKAGE CONTENTS
2
Setpoint modification
Operating mode setting
Depleted batteries signal
(for Keo-B only)
Error probe signal
Night reduction
(for Keo-B only)
thermostat
Cover, knob and plastic elements are available in white and anthracite grey colours
Covers
VI plastic
elements BM plastic
elements
A mount
AIR mount
B mount
C
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NA
NC
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L
230V
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EXTERNAL
CONTACT
Keo-A
Keo-B
CONTATTO ESTERNO
C
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NA
NC
1
2
3
4
5
1
2
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5
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Setpoint = programmed setpoint
Setpoint = programmed setpont -3°C
Regulation type setting
Vemer S.p.A.
I - 32032 Feltre (BL) • Via Camp Lonc, 16
Tel +39 0439 80638 • Fax +39 0439 80619
e-mail: [email protected] - web site: www.vemer.it
MKIS00745-012-EN
Mod.
KEO-A
KEO-B
Flush-mounting electronic thermostats for temperature control both in
heating and cooling. They perform actions of type 1B and are intended for
operating in environments with Pollution Degree 2 and Overvoltage Category III
(EN60730-1).
•
Keo-B
, with battery power supply and an input for the connection of an
external contact with whom to reduce the setpoint of 3°C.
•
Keo-A
with mains power supply.
Code
Model
Description
VN170700
Keo-B
Battery thermostat with digital input
VN171500
Keo-A
230V Thermostat
SAFETY WARNINGS
During product installation and operation it is necessary to observe the
following instructions:
1) The device must be installed by a qualified person, in strict compliance with the
connection diagrams.
2) Do not power or connect the device if any part of it is damaged.
3) After installation, inaccessibility to the connection terminals without appropriate
tools must be guaranteed.
4) The device must be installed and activated in compliance with current electric
systems standards.
5) Before accessing the connection terminals, verify that the leads are not live.
6) In the electrical system of the building where the instrument must be installed,
a protection device from the overcurrents must be present (for Keo-A model
only).
TECHNICAL SPECIFICATIONS
• Power supply Keo-B: – 2 alkaline batteries 1.5V (AAA type)
– battery life: 12 months
– depleted batteries indication
• Power supply Keo-A: – 230Vac (-15% ÷ +10%) 50/60Hz
– max absorption: 6 VA / 230Vac
• Installation on 3 modules box (503 type)
• Terminals Keo-B:
– 3 terminals for 1.5 mm
2
cables for output relay 5A / 250 Vac
– 2 terminals for 1.5 mm
2
cables for digital input (3°C setpoint reduction)
• Terminals Keo-A:
– 3 terminals for 1.5 mm
2
cables for bistable output relay 5A / 250 Vac
– 2 terminals for 1.5 mm
2
cables for power supply
• Operating mode: summer/winter/off (with antifreeze)
• Regulation type:
– on/off with fixed differential (0.3°C)
– P8 proportional with 0.8°C band (-0.3 ÷ +0.5°C) and period 8 minutes
– P15 proportional with 1.5°C band (-0.7 ÷ +0.8°C) and period 15 minutes
• Measurement precision: ±0.5 °C
• Setpoint range: 5°C ÷ 35°C
• Operating temperature: 0°C ÷ +50°C
• Storage temperature: -10°C ÷ +65°C
• Operating humidity: 20÷90% non condensing
• Protection degree: IP40
• Insulation: reinforced among accessible parts (frontal) and all other terminals
• Mechanical locks on the knob to limit the setpoint
The thermostat signals the error probe condition by blinking the LED 2 times
per second.
In this case the regulation is inhibited and the relay contact is kept open.
Contact Vemer Technical Assistance.
The Keo-B has an input to whom to connect an external contact.
With closed contact, the setpoint is reduced by 3°C than is set with the knob
(in heating mode only).
• Install the thermostat at a height of about 1.5 m above the floor, away from
direct sunlight, away from doors, windows, heat sources, locations with
excess or total lack of ventilation.
• The device is sold already mounted
with anthracite colour. To transform it
in the white version, remove the knob
and the cover, acting on the hooks
placed on the upper and lower side
of the device and mount the cover
and the white knob included in the
package.
• Make the connections by respecting
the diagrams described in this manual.
The choice of the operating logic occurs
via selector switch placed on the front
of the device. It’s possible to choose
among 3 modes:
• cooling mode. Place the selector
switch in position if the device is
connected to a cooling system. The
output relay is activated when the
environment temperature is higher
than the set one.
• off mode. Place the selector switch in position in case the system should be
turned off for long periods.
Note: In this condition, the thermostat activates the heating system if the
temperature falls below 2 °C (antifreeze temperature).
• heating mode. Place the selector switch in position if the device is
connected to a heating system. The output relay is activated when the
environment temperature is lower than the set one.
The device has a jumper with whom to
choose the type of regulation, between
on/off or proportional.
To access the jumper you need to remove
the cover after removing power supply
to the device. The position of the jumper
determines the type of regulation as
follows:
− jumper in position A: ON/OFF regulation
with fixed differential at 0.3°C
(default setting)
− jumper in position B: proportional regulation with band 0.8 °C
(-0.3 +0.5) and 8 minutes time base
− jumper in position C: proportional regulation with band 1.5 °C
(-0.7 +0.8) and 15 minutes time base
Example of proportional operation with band 0.8°C and 8 minutes base
Tmis = Tset + 0.5 °C = relay OFF
Tmis = Tset + 0.4 °C = 1 minute ON ; 7 minutes OFF
Tmis = Tset + 0.3 °C = 2 minutes ON ; 6 minutes OFF
Tmis = Tset + 0.2 °C = 3 minutes ON ; 5 minutes OFF
Tmis = Tset + 0.1 °C = 4 minutes ON ; 4 minutes OFF
Tmis = Tset
= 5 minutes ON ; 3 minutes OFF
Tmis = Tset - 0.1 °C = 6 minutes ON ; 2 minutes OFF
Tmis = Tset - 0.2 °C = 7 minutes ON ; 1 minute OFF
Tmis = Tset - 0.3 °C = relay ON
Example of proportional operation with band 1.5°C and 15 minutes base
Tmis = Tset + 0.8 °C = relay OFF
Tmis = Tset + 0.7 °C = 1 minute ON ; 14 minutes OFF
Tmis = Tset + 0.6 °C = 2 minutes ON ; 13 minutes OFF
Tmis = Tset + 0.5 °C = 3 minutes ON ; 12 minutes OFF
Tmis = Tset + 0.4 °C = 4 minutes ON ; 11 minutes OFF
Tmis = Tset + 0.3 °C = 5 minutes ON ; 10 minutes OFF
Tmis = Tset + 0.2 °C = 6 minutes ON ; 9 minutes OFF
Tmis = Tset + 0.1 °C = 7 minutes ON ; 8 minutes OFF
Tmis = Tset
= 8 minutes ON ; 7 minutes OFF
Tmis = Tset - 0.1 °C = 9 minutes ON ; 6 minutes OFF
Tmis = Tset - 0.2 °C = 10 minutes ON ; 5 minutes OFF
Tmis = Tset - 0.3 °C = 11 minutes ON ; 4 minutes OFF
Tmis = Tset - 0.4 °C = 12 minutes ON ; 3 minutes OFF
Tmis = Tset - 0.5 °C = 13 minutes ON ; 2 minutes OFF
Tmis = Tset - 0.6 °C = 14 minutes ON ; 1 minute OFF
Tmis = Tset - 0.7 °C = relay ON
Note: The proportional regulation is available only for the heating operation.
Note: The position of the jumper is read only when the device is on.
Change the position of the jumper when the device is supplied, as well as
expose you to possible shock, so it is useless.
To change the setpoint, turn the knob. The range of settable values is from
5°C to 35°C.
On Keo-A the activation of the relay is signaled by the red LED.
On Keo-B the activation of the relay is not reported to limit battery
consumption.
The device has two ring nuts to
limit mechanically the range if the
thermostat is installed in public places
or in hotel rooms.
To limit the range, proceed as follows:
- Set the knob in an intermediate
value of the desired range (for
example if you want to limit the
range between 15°C and 25°C
turn the knob until the indicator is
in position 20°C).
- Remove the knob.
- Under the knob there are two ring nuts marked by the word “min” and
“MAX”, respectively for the lower and upper limit.
- Turn the “min” ring nut clockwise and “MAX” anticlockwise until the
desired position (in this case 15 for min and 25 for MAX).
- Replace the knob, making sure that the indicator of the setpoint on the
knob is in the same position when the knob has been removed (in this case
20°C).
To remove the limitation to the setpoint and reset the range 5÷35°C turn the
two ring nuts up to bring the locks of limitation in a position outside the range
5÷35°C.
• Fix the device inside the 3 modules box in compliance with the assembly diagrams
described on the back of this instruction sheet. The accessories for the installation
included in the package allow the mounting of the plates described in the diagram
“adjustable plates” and they are:
- mount A
- mount B (it could be necessary to remove the side cogs)
- mount AIR
- couple of side BM plastic elements (both of white colour and grey colour)
- couple of side VI plastic elements (both of white colour and grey colour)
- covers and knobs of white colour and anthracite grey colour.
• When you turn on for the first time the thermostat is performed a cycle of switching
of the relay of OFF-ON-OFF type of the total duration of 3 seconds. Once finished the
cycle the thermostat begins with the regulation.
The adapters inside the box allow the monitoring of the following cover
plates:
For information about the possibility to adapt the thermostat with different
cover plates from those listed, contact the Technical Service.
* through mount that you can buy on request (code VE767500)
• All the above trademarks are the property of their respective owners.
ABB Chiara series
ABB Mylos series
Ave S44 series
Bticino Axolute series
Bticino Axolute Air
Bticino Light series
Bticino Light tech series
Bticino Living series
Bticino Livinglight series
Bticino Livinglight Air series
Bticino Matix series
Gewiss Chorus series
Vimar Eikon series
Vimar Eikon Evo series
Vimar Idea series
Vimar Plana series
Vimar Arké series
REFERENCE STANDARDS
Compliance with Community Directives
2014/35/EU (LVD)
2014/30/EU (EMCD)
is declared with reference to the following harmonized standards:
• EN 60730-2-9
06-2017
C
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NA
NC
N
L
230V
~
EXTERNAL
CONTACT
Keo-A
Keo-B
CONTATTO ESTERNO
C
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M
NA
NC
1
2
3
4
5
1
2
3
4
5
4
5
4
5
Setpoint = programmed setpoint
Setpoint = programmed setpont -3°C
When the battery is almost depleted, the yellow LED turns on for half a second
every 10 seconds. In this condition it is necessary to replace the batteries as
soon as possible.
Dispose of the batteries in the appropriate
recycling containers.
