DALEMANS U-H1 User manual

Revision V1R0 •10/2020
Alarm Control unit for flammable gases
INSTRUCTION MANUAL

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Copyright ©2020 by DALEMANS s.a.
Revision V1R0 • 10/2020
Any reproduction, partial or full, of this document by means of
any process whatsoever without prior written consent from
DALEMANS s.a. is strictly prohibited.
Warning
All information contained in this document is non-contractual
and subject to change without notice.
We also encourage you to regularly check the availability
of a new version on our website: http://www.dalemans.com
Please contact your distributor in case of doubt,
Dalemans s.a.
Rue Jules Mélotte, 27 • B-4350 Remicourt (Belgium)
Tel. [phone] • Fax [phone]
Email: [e-mail]

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CONTENTS
1. GENERAL REMARKS ................................................................................. 5
1.1RESPONSIBILITIES –GUARANTEES ................................................... 5
1.2 SAFETY INFORMATION ............................................................ 6
1.3ENVIRONMENT ....................................................................................... 7
1.4U•H1 CONTROL UNIT ............................................................................. 7
2. INSTALLATION OF THE CONTROL UNIT........................................... 10
2.1 PRECAUTIONS FOR USE .................................................................... 10
2.2 PLACEMENT OF THE U•H1 CONTROL UNIT ..................................... 10
2.3 CONNECTING THE CONTROL UNIT ................................................... 11
2.4 CONNECTING THE DETECTOR ........................................................... 12
2.5POWER CONNECTION ......................................................................... 12
2.6 CONNECTING THE SIREN ................................................................... 13
2.7 CONNECTING THE RELAYS ............................................................... 13
3. INSTALLATION CONTROL ..................................................................... 14
4. INSTALLATION CONFIGURATION ....................................................... 14
4.1 FACTORY CONFIGURATION ............................................................... 14
4.2 GENERAL MENU .................................................................................. 15
System information..........................................................................................15
History .....................................................................................................16
Ages of the calibration parameters........................................................16
Date and time ..........................................................................................16
Configuration of the U•H1 control unit ..................................................17
• Basic standard configuration ................................................................... 17
• Alarm thresholds ..................................................................................... 18
• Relay failsafe mode configuration ........................................................... 18
• Reset mode for level 1 alarms ................................................................ 18
• “Siren” mode ............................................................................................ 18
• Behaviour of the external alarm .............................................................. 19
• Normal state of the external alarm .......................................................... 19
• Errors reset mode .................................................................................... 19

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Status of the system’s elements .................................................................. 20
System tests ................................................................................................. 21
4.3 SERVICE MODE .................................................................................... 21
Entering the password .................................................................................. 21
Service menus ............................................................................................... 22
Advanced system tests ....................................................................... 22
• Output tests ............................................................................................. 22
• Detector simulation ................................................................................. 23
Configuration of the measurement channel ....................................... 24
• Location of the detector............................................................................ 24
• Predefined locations................................................................................. 24
• Customised location ................................................................................ 25
• Putting the detector out of service............................................................ 25
Configuration of the external alarm .................................................... 26
• Behaviour of the external alarm .............................................................. 26
• Normal state of the external alarm .......................................................... 27
Maintenance management ............................................................................ 27
• Maintenance interval ............................................................................... 27
• Renewal of the validity of the calibration parameters ............................. 28
Initialization of the detector ............................................................................29
5. SPARE PARTS AND OPTIONS .............................................................. 30
6. TECHNICAL CHARACTERISTICS ........................................................ 31
6.1 General remarks..................................................................................... 31
6.2 Detectable gases.................................................................................... 31
6.3 Product characteristics ........................................................................ 32
7. ANNEXES ...................................................................................................... 33

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1. GENERAL REMARKS
1.1 RESPONSIBILITIES - GUARANTEES
The installer is required to respect standards and installation provisions.
The installation must be carried out by qualified personnel.
All our equipment is tested and inspected in our workshops before shipping.
This manual must be read carefully by anyone who is or will be responsible for the installation, use
and/or maintenance of this equipment. The guarantee offered by DALEMANS SA will be void if this
equipment is not installed, used and maintained in compliance with these instructions, warnings and
limits of use.
By following these instructions, you guarantee the proper working of the equipment. Please contact
DALEMANS SA for any information about the use or maintenance of this product.
ONLY use original DALEMANS SA parts when performing maintenance on the equipment as described
in this manual. Otherwise you may seriously alter the equipment’s performances.
Any repair or maintenance performed without respecting the procedures described in this manual or
without help from our after-sales service may prevent the equipment from working correctly and, as a
result, prevent guaranteeing the safety of the occupants of the building and installations.
This equipment must be installed indoor, in a clean and dry area. Please use a screen (box) to avoid
any projections of water of polluting agents. Don’t hesitate to contact DALEMANS SA for any additional
information concerning the use of maintenance of this product.
DALEMANS SA cannot be held responsible for any direct or indirect damage as well as any direct and
indirect monetary damages resulting from the failure to comply with these guidelines.
DALEMANS SA guarantees that the U•H1 control unit is free from manufacturing defects and agrees,
at its sole discretion, to repair or replace any component which is defective or likely to become so in the
context of normal use during the warranty period specified in the general terms of sale.
This guarantee does not cover elements such as fuses or any other component provided by a third
party.
Claims concerning the DALEMANS SA product guarantee must be made in the guarantee period
specified above and within 5 calendar days of the discovery of the problem. Please contact your
DALEMANS SA after-sales service to register your claim.
For any additional information, please refer to DALEMANS SA general conditions available on request.

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1.2 SAFETY INFORMATION
Symbol
Description
Protective ground terminal
Warning : risk of electric shock
Warning : refer to instruction manual
The following units are used throughout this document
Ah
Ampere-hour
VAC
Voltage with alternative current in volts
VDC
Voltage with continuous current in volts
mA
Current in milliampere
W
Power in watt
The installation and commissioning of U•H1 control unit must be performed by qualified personnel only.
This qualified personnel is trained and accredited by DALEMANS SA During installation, refer to the
standards in application.
Should the equipment be installed or used in a manner not specified by DALEMANS SA, the protection
provided by the equipment may be impaired.
Modification, disassembling and total or partial destruction of this equipment may invalidate the essential
safety requirements of the whole plant.
For commissioning, please contact DALEMANS SA to arrange an appointment.
Do not open the equipment without disconnecting mains power supply first

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1.3 ENVIRONMENT
The presence of the crossed-out wheelie bin logo on this product means that you are
required to respect the regulations in force concerning the collection and recycling of
electrical and electronic waste.
These provisions aim to preserve the natural resources used to produce this product
and to avoid the dispersal of substances which are potentially harmful to the
environment and human health.
Once this product reaches the end of its life, you MUST discard it by taking it to an approved collection
centre for the recycling of electrical and electronic equipment.
For more information on collection and recycling centres in your region, please contact your local or
regional administration.
1.4 U•H1 CONTROL UNIT
General information
The U•H1 control unit is a fixed automatic alarm management device linked to explosive gas
detection. The 3F+ detector is a fixed device that permanently transmits to the U•H1 control unit a signal
proportional to the gas concentration detected in the air.
Before the LEL
1
for the gas observed is reached in the atmosphere, this electronic control unit can act
on safety equipment such as:
•the closure of a gas valve,
•the cut-off of the electrical current,
•the triggering of an alarm,
Two adjustable alarm thresholds are respectively associated with the actions on the relays. These are
relays controlling the safety equipment connected thereto.
A U•H1 control unit output specifically adapted for the connection of a sounder or a flash lamp is
automatically activated in case of alarm. At any time, it may be reset from the U•H1 control unit.
The U•H1 control unit also has internal fault management. Once detected, any abnormal operation of a
detector or the control unit is indicated by an action on the relay signalling the technical fault. This
function guarantees the reliability of the gas detection.
1
LEL: Lower explosive limit: the concentration from which an air/gas mix becomes dangerous.
Danger zone
Detector
Zone may be
dangerous
Valve
Gas stop
Siren
Flashing light
Non-danger zone
U•H1
control unit
3F+
! It is strongly
recommended to place
the control unit outside
the zone being protected !

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Finally, all or part of the alarms can be notified to an external piece of equipment, such as a central
technical management system, by an action on an additional alarm relay.
At any moment, the status of the control unit and the triggering of each of the functions presented may
be observed visually through the elements on its front:
•A display with a backlight that varies based on the status of the U•H1 control unit and
providing an explanation of this status.
•A set of colour LEDs providing more specific information on these functions.
•An audible buzzer, which can be reset, is activated in the event of an alarm or by error
function.
Display interface
LED
LED indicators
“Power” LED
The control unit is supplied by the main power.
“Fault” LED
Presence of a technical fault connected to the fault
relay or not.
“Inhibit” LED
The control unit is in a particular operating mode:
The measurement of the gas concentrations and the
alarm management still takes place, but the status
of the alarm relay is unchanged. This mode
spontaneously stops after 15 minutes of
inactivity.
Keypad
LED Indicators
Display

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Display
The current status of the U•H1 control unit is indicated by information messages on the display and a
coloured backlight.
When an alarm is present, only alarm messages are displayed. Any messages associated with a
technical fault is no longer present.
Keypad
Allows movement within a menu or within a selection
Allows entry to a sub menu or to the action associated with the selected menu item
Allows exiting a sub menu and return to the parent menu
ENTER
Allows entry in configuration mode, confirmation of a parameter change or starting the
action associated with the selected menu item
ESC
Allows exiting the configuration menu completely or to abandon the current parameter
change and return to the parent menu
RESET 1 x
Allows turning the audible alarm and the transistor output off (potentially connected to
an alarm)
RESET 2 x
Allows:
--resetting an alarm if the gas concentration returns below the threshold which
triggers it.
--resetting the errors still indicated but no longer ongoing.
Backlighting
Off
Green
Yellow
Red
Mode
Sleep
No alarm
Maintenance
Alarm
Message
Cyclical display:
•“No Alarm” to report the
absence of an alarm.
•Maintenance date:
“Next maintenance”
•Gas concentrations values
(LEL percentage) observed
by the detector.
Maintenance date if exceeded:
“Maintenance needed “.
Cyclical display of alarms:
•List of level-1 alarms if
no level 2 alarm
“Gas presence”
•List of level 2 alarms
“Gas alarm”
Technical fault
Cyclical display:
•List of errors and
technical fault
Note:
The display’s backlighting goes into sleep mode after 60 seconds. As soon as the keypad is used,
as soon as an alarm is detected or as soon as a technical fault appears, the U•H1 control unit goes
out after sleep mode.

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2. INSTALLATION OF THE CONTROL UNIT
2.1 PRECAUTIONS FOR USE
For your safety, before undertaking any action, always make sure that the equipment is disconnected
from mains power supply.
The U•H1 control unit’s enclosure can only be opened by qualified personnel.
The U•H1 control unit must be placed in a room without any explosive atmosphere and within easy
reach.
As the U•H1 control unit’s enclosure is reversible, it may be set up to receive electrical cables from the
top or bottom. To guarantee optimal sealing, cables should be received from the bottom.
The equipment must be placed in a dry and clean environment.
A set of holes are provided in the enclosure. To install the cable glands, it is necessary to remove the
machined parts from these holes using a flat-head screwdriver and a mallet.
Important note:
Never place the U•H1 control unit, the alarm and the cable for the detector in the vicinity of :
-a high-voltage cable or a power cable,
-coaxial cable or transmitter,
-welding station or frequency regulator.
2.2 PLACEMENT OF THE U•H1 CONTROL UNIT
The U•H1 control unit must be attached to a clean and damp-free wall. Two attachment systems, a
drilling diagram and a quick installation guide are provided with the equipment. You can opt for
attachment via the enclosure or via the 4 fixing feets provided.
Optionally, it is also possible to attach the U•H1 control unit to a DIN rail. Please contact your
DALEMANS SA representative for more information.
If the attachment method without feet is chosen, attach the enclosure using the 4 holes located in the
corners of the enclosure using a PZ2 screwdriver with a minimum length of 150 mm.
For the different stages, refer to the quick installation guide provided in the packaging.
Before drilling these holes using a tool, it is recommended to remove the
electronic part to avoid any accidental damage.

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2.3 CONNECTING THE CONTROL UNIT
The installation and the electrical connections must be carried out by qualified personnel in accordance
with the instructions set out in this manual and on the diagram shown on the back of the cover of the
U•H1 control unit.
It is recommended to place the circuit breaker in the vicinity of the equipment.
All installations must comply with locally-applicable standards and regulations, notably the cable type
and section of the wires to be used.
During electrical connection of the terminals, make sure the wires are attached to the connectors. Use
a maximum tightening torque of 0.60 Nm. In order to achieve electrical safety, wires going from the
enclosure’s cable glands to the board’s terminal blocks shall not be longer than 70 mm.
It is recommended to always use wires with a crimping end to avoid any risk of poor electrical contact.
Example of a connection diagram for the U•H1 control unit:
A circuit breaker (2-poles, 6A, 250V (AC)) must be placed on both live and
neutral. See the wiring example below.

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2.4 CONNECTING THE DETECTOR
In the majority of cases the design of the U•H1 control unit makes the use of a shielded cable
useless. However, if the cable is exposed to magnetic interference (transmitters, welding station,
switching relay, HF transmitter disturbance of the cable conduit, computer network, etc.), the use of a
shielded cable is recommended.
To connect the detector, use a flexible 3-conductors cable with a section between 0.75 and 1.5 mm2.
The distance between the detector and the control unit is limited to 300 m.
Connect the terminals from each detector in the U•H1 control unit be respecting the following order:
Detector terminal
Central terminal
24V
24V
GND
GND
OUT
IN
Warnings:
-Never use two or more wires to increase the wire section. The cable must be a
single length (without connection) and properly attached to suitable terminals. Use a
maximum tightening torque of 0.60 Nm.
-Never place the cable of a detector in proximity to a coaxial cable or next to a power
cable and certainly not in the same conduit or in the same wire path.
2.5 POWER CONNECTION
The U•H1 control unit must be able to be isolated electrically in case of intervention (protection by a
breaker or a 2-way switch).
The power for the U•H1 control unit and that for the gas valve(s) must be connected on the same circuit.
Make sure that the power conductors are always fixed together and separated from the low-voltage
conductors.
The power cables for the 230 V section must have a minimum section of 1.5 mm2.

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U•H1 Control Unit is a class I equipment. It must always be connected to ground using the protective
ground terminal in accordance with the instructions in this manual.
First connect protective ground wire using terminal 3. Then connect the 230V mains voltage to
terminals 1 and 2; see diagram below.
2.6 CONNECTING THE SIREN
The siren’s connection cables must meet the same requirements as those of the detector (see §
connecting the detector).
Connect the terminals +(terminal 21) and –(terminal 22) from the sounder device to the U•H1 control
unit. Respect the polarity to avoid damaging the sounder device.
To connect and adjust the tone of the alarm, refer to the sounder's instruction manual.
2.7 CONNECTING THE RELAYS
The U•H1 control unit has a technical fault relay and 3 relays addressable by the alarms. It is possible
to connect different types of servo controls thereto such as a sounder device, a valve, a flash lamp, etc.

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3. INSTALLATION CONTROL
Wiring check
Check that each wire is positioned correctly and that the terminals are tightened properly.
Voltage verification
To power your U•H1 control unit on, make sure that the terminals are tightened properly and that the
supply voltage is within the accepted operating voltage range accepted by the U•H1 control unit.
4. INSTALLATION CONFIGURATION
The configuration mode for the U•H1 control unit comprises a set of menus allowing the consultation or
modification of the system’s parameters. These menus are accessible regardless of the status of the
U•H1 control unit by pressing “Enter” on the keypad (if the display is in sleep mode, this mode must be
exited first by pressing any button). Once in this mode, the colour of the display’s backlight changes
to blue.
The U•H1 control unit automatically exits from the configuration mode after a period of inactivity of 1
minute (no action on the keypad) and returns to the suitable mode (normal mode if no errors or alarms;
error mode if an error is present without an alarm; alarm mode if an alarm is present).
4.1 FACTORY CONFIGURATION
The U•H1 control unit comprises a factory configuration which can be adapted based on the installation
in question.
By default, the U•H1 control unit is configured as follows:
•1 detector,
•relays addressed as is:
o1 first relay (terminals 7 - 9 on the diagram) associated with alarm of level 1,
o2 finals relays (terminals 10 - 15 of the diagram) functioning simultaneously and
associated with alarm of level 2,
•relay not in failsafe mode, i.e. not powered at rest and powered in case of alarm,
•gas concentration thresholds set at 20% LEL for alarm level 1 and 40% LEL for level 2,
•the input for an external alarm is disabled,
For commissioning, please contact DALEMANS SA to arrange an appointment !

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As standard, the channel is deactivated. Hence it is necessary to initialize the detector to activate the
channel to which it is connected (see § "Initialization of the detector").
4.2 GENERAL MENU

Service Menu
Service mode

Info Menu
System information

Status Menu
Status of the system’s elements

Tests Menu
System tests

Navigation in the menus is via the directional buttons on the keypad and the selection using “Enter”
(see the § “Keypad”paragraph).
System information
The information menu provides information concerning all the control unit’s elements. With the exception
of the date, all these elements are accessible as read-only.

View history
Consultation of the control unit’s history

Calibration age
Consultation of the age of the calibration parameters for
the detector

AREA
Alarm Level 1
20%LEL
Relay 1
Alarm Level 2
40%LEL
Relay 3
Relay 2
Channel 1

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
Firmware version
Vx.yy
Firmware version of the control unit

Date & time
dd/mm/yyyy hh:mm
Control unit date and time

Configuration info
Sub menu providing control unit configuration information

History
All events occurring in the control unit are saved in a permanent memory of the U•H1 control unit.
The “Up” and “Down” buttons allow chronological navigation within these events.
The “Esc” button can be used to abandon the modification and return to the information menu.
Age of the calibration parameters
The calibration parameters for a 3F+ detector need to be verified after a period which can be set in the
U•H1 control unit. Once this period has passed, a maintenance alert is indicated.
The number of days since the last calibration is displayed.
Example of display of the age of the calibration parameters:
Heater
154 days
The “Esc” button can be used to abandon the consultation and return to the information menu.
Date and time
The date and time of the U•H1 control unit are stored in a volatile memory. They are only refreshed
when the control unit is powered.
If the date or time of the U•H1 control unit are incorrect, using the “Enter” button on the keypad accesses
editing mode:
•“Date & Time setting” is displayed
•The cursor flashes on the field value of the date or time to be modified.
Date & time setting
dd/mm/yyyy hh:mm

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The “right” and “left” buttons change the field to be edited:
•the day
•the month
•the year
•the time
•the minutes
The “Up” and “Down” buttons change the value of the selected field.
Once the date and time are updated, the modification is confirmed using the “Enter” button.
The “Esc” button can be used to abandon the modification and return to the information menu.
Configuration of the U•H1 control unit
All the elements of the U•H1 control unit configuration can be consulted using the “Configuration
Info” sub menu:

Base configuration
Default config.
Basic standard configuration

Alarm thresholds
Alarm thresholds

Failsafe config.
Relays failsafe mode configuration

Level 1 alarm mode
Latching
Reset mode for level 1 alarms

Level 1 siren mode
Not in siren mode
“Siren” mode for level 1 alarms

Ext. alarm config.
Disabled
Behaviour of the external alarm

Error reset mode
Automatic
Errors configuration mode

•Basic standard configuration
This is the standard configuration that has been selected during commissioning of the U•H1 control unit.
However, special configuration parameters can be modified relative to this basic configuration.
For details of the standard configurations, contact a DALEMANS SA representative.

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•Alarm thresholds
The elements in this sub menu can be used to view the gas concentration value associated with the
threshold of the different alarm levels.
•Relay failsafe mode configuration
The safety mode of a relay defines its status when it is at rest:
- Not in failsafe mode: the relay is not powered at rest.
- Failsafe mode: the relay is powered at rest.
The failsafe mode of an alarm relay is unset by default. The failsafe mode of each alarm relay is
independently configurable.
•Reset mode for level 1 alarms
The reset mode for an alarm specifies the way in which it is reset:
- Latching mode: when the cause of the alarm has disappeared, the alarm remains activated
until a manual action (“RESET”) is performed on the control unit.
- Non-latching mode: when the cause of the alarm has disappeared, the alarm is automatically
reset and disappears
Only the reset mode for the level 1 alarms can be configured. A level 2 alarm always needs to be
manually reset.
In manual reset mode, the U•H1 control unit can display an alarm message when the gas concentration
has already returned to under the alarm threshold.
Heater
Gas alarm 13%LEL
This configuration element applies to all level-1 alarms.
•“Siren” mode
The “Siren” mode designates a specific behaviour similar to that of the “Siren” output of the U•H1 control
unit or its audible indicator: while the alarm is still active (the gas concentration is still greater than the
alarm threshold), it is possible to reset the actions on the relays.
Note:
The “Technical Fault” relay is always in failsafe mode.
Activation of this configuration is to be performed by a technician approved by DALEMANS SA.
Note:
The “latching” mode of the relays is the default mode.

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This configuration element applies to all level-1 alarms.
•Behaviour of the external alarm
The reaction of the U•H1 control unit to a change of state on the “External Alarm” input can be
configured as follows:
- Disabled: a change of the input’s state will have no effect,
- Addresses the level 1 alarm ("Set alarm level 1"): a change of the input’s state activates the
level 1 alarm of the U•H1 control unit,
- Addresses the level 2 alarm ("Set alarm level 2"): a change of the input’s state activates the
level 2 alarm of the U•H1 control unit.
- Addresses both alarm levels ("Set alarm levels 1&2"): a change of the input’s state activates
the levels 1 and 2 of the alarm of the U•H1 control unit.
•Normal state of the external alarm
The external alarm, when it is active, is triggered by a change of state on the U•H1 control unit which is
dedicated to the external alarm’s connection. This configuration element specifies the state of this input
at rest and, as a result, the nature of the state change which triggers the alarm.
The possible states are as follows:
•“normally closed”: at rest, the circuit connected to the input is closed. The external alarm is
thus activated when the circuit is opened.
•“normally opened”: at rest, the circuit connected to the input is open. The external alarm is
activated when the circuit is closed.
•Errors reset mode
The U•H1 Control Unit has an internal fault management. Once detected, any abnormal operation of the
U•H1 Control Unit or D•TEX 3F+ detector is notified by an action on the relay signaling the technical
defect.
The mode to reset a technical fault specifies how it is reset:
- as standard, the U•H1 Control Unit is configured for automatic reset.
Error reset mode
Automatic
Note:
This mode does not apply to level-2 alarms.

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When the cause of the error restored, the message is automatically reset and disappears.
- Manual reset.
In the manual acknowledge mode, although the cause of the error has disappeared and the system is
restored, the error remains notified until a manual action (“2x RESET”) is performed on the U•H1 control
unit.
Status of the system’s elements
This menu is used to consult the status of the elements of the U•H1 control unit.
Sub menu
Content

Channel setting
Gives, the status of the channel:
- “disabled“: channel inactive in the
eyes of the system
- display of measurements

Outputs
Gives the status of the outputs:
- output inactive in the eyes of the
system (“disabled”)
- enabled
(« activated » / « not activated »)

Supply
Mentions if the control unit is connected
to the distribution network. Pressing the
“Enter” button gives the supply voltage.

Temperature
Mentions the temperature of the U•H1
control unit. Pressing the "Enter" key
gives the minimum, current and
maximum temperature.

Error reset mode
Manual acknowledge
Note:
All events occurring in the U•H1 control unit are saved in a permanent control unit memory
(cf. § “View history”).
Activation of the “Manual acknowledge”is to be performed by a technician approved by
DALEMANS SA.
Outputs
Channel setting
Power supply
xxxx
Temperature
xx °C