FRIULAIR PURESTREAM MINI-CUBE QBS Series User manual

QBS Air Cooled Water Chiller
User Manual
MINI-CUBE
BY FRIULAIR
PURESTREAM

Editions Record
Code
Revision
Edition
Changes
7425MUM651
02
02/2018
Original instructions: ITALIAN
EN Translation of the original instructions

Dear Customer,
Thank you for the trust you have placed in us. Please read this manu al carefully to obtain the best
performance from our product.
In order to avoid incorrect operating conditions and danger for the operators, it is essential that you
follow the directions meticulously as well as the current accident-prevention laws in the country of
use.
Each QBS chiller is rigorously tested before being packed.
This verifies that there are no manufacturing defects and that the machine performs correctly the
functions for which it was designed.
This manual must be kept for future reference and is an integral part of the chiller you have
purchased.
Due to continuous technical development, we reserve the right to make the necessary modifications
without any obligation to give advance notice.
Do not hesitate to contact us if you have any problems or need more information.
The product identification plate, located on the side of the chiller, contains all essential information
about the machine.
You will have to give this data to the manufacturer, or reseller, wh enever you request information,
replacement parts, etc., during the warranty period.
Removing or tampering with the identification plate will void the warranty.
Warranty conditions:
For 12 months from the commissioning date, and no more than 14 months from the shipping date, any
parts that were originally defective will be repaired or replaced at no charge. Exp enses for transport
and travel, room and board for our technicians are excluded.
The warranty excludes any liability for direct or indirect damage to persons, animals and/or property
that are caused by incorrect use or inadequate maintenance and is exclusively limited to
manufacturing defects.
The right to service under the warranty is secondary to your faultless observance of the installation,
use and maintenance instructions in this manual.
The warranty will be voided immediately if the chiller is modified or tampered with, even slightly.
When requesting warranty service, you must provide the data on the product's identification plate.

SUMMARY
1Safety Rules ............................................................................................................. 1
1.1 Definitions of the symbols used ........................................................................................ 1
1.2 Warnings .......................................................................................................................... 2
1.3 Proper use of the chiller .................................................................................................... 2
1.4 Instructions for using equipment under pressure conforming to PED Directive 2014/68/EU
3
2Operation And Main Components .......................................................................... 4
2.1 Refrigerant circuit .............................................................................................................. 4
2.2 Water circuit ...................................................................................................................... 4
2.3 Fan ................................................................................................................................... 4
2.4 Condensation control ........................................................................................................ 4
2.5 Control of the water temperature....................................................................................... 5
2.6 Protecting the integrity of the machine .............................................................................. 5
2.7 QBS units: identification of the main components ............................................................. 5
2.8 Spare parts ....................................................................................................................... 6
3Installation ................................................................................................................ 7
3.1 Transport .......................................................................................................................... 7
3.2 Storage ............................................................................................................................. 7
3.3 Place of installation ........................................................................................................... 7
3.3.1 Installation spaces......................................................................................................................................... 8
3.4 Water connections ............................................................................................................ 8
3.4.1 Recommended water system ....................................................................................................................... 9
3.4.2 Use of ethylene glycol as a winter anti-freeze............................................................................................ 10
3.4.3 Charging the water circuit........................................................................................................................... 10
3.5 Electrical connections ..................................................................................................... 11
4Preliminary Checks And Start-Up ......................................................................... 12
4.1 Preliminary checks and preparation for the first start-up ................................................. 12
4.2 Startup ............................................................................................................................ 12
4.3 Start-up under critical conditions ..................................................................................... 12
5Electronic Controller – QBS standard .................................................................. 13
5.1 Main functions of the electronic controller buttons and meanings of the icons ................ 13
5.2 Turning on and off ........................................................................................................... 14
5.3 Controlling water temperature ......................................................................................... 14
5.4 Changing the set point .................................................................................................... 14
5.5 Temperature display as detected by the probes .............................................................. 14
5.6 Locking and unlocking the keyboard ............................................................................... 15
5.7 Compressor operation hours ........................................................................................... 15
5.8 Setting the configuration parameters ............................................................................. 15
6Autoadaptive Controller – QBS with EAA option ................................................ 16
6.1 Main functions of the electronic controller buttons and meanings of the icons ................ 16
6.2 Turning on and off ........................................................................................................... 16
6.3 Controlling water temperature – Standard setting ........................................................... 17
6.4 Changing the set point .................................................................................................... 17
6.5 Showing the temperature read by probe 1 (ambient temperature) .................................. 17
6.6 Showing the temperature read by probe 2 (outlet water temperature) ............................. 17
6.7 Locking/Unlocking the keyboard ..................................................................................... 18
6.8 Alarms ............................................................................................................................ 18
6.9 Setting configuration parameters .................................................................................... 18
6.10 Table of standard parameters configuration .................................................................... 19

6.11 Alternative method of temperature regulation ................................................................. 19
6.1 Calibration of the safety devices and type of rearm ......................................................... 20
6.2 Rearming the high-pressure pressure switch .................................................................. 21
7Operating Limits .................................................................................................... 22
8SEPR - SEASONAL ENERGY PERFORMANCE RATIO ACCORDING TO
COMMISSION REGULATION (EU) 2016/2281 ................................................................ 22
9Maintenance, Inspections And Periodic Checks ................................................. 23
10 Troubleshooting ..................................................................................................... 24
11 Dismantling The Chiller ......................................................................................... 26
12 Water Diagrams ...................................................................................................... 27
13 Refrigerant Diagrams............................................................................................. 28
14 Dimensional Drawings........................................................................................... 29

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7425MUM651 Model: QBS - Use and Maintenance Manual Rev. 02
1
SAFETY RULES
1.1 DEFINITIONS OF THE SYMBOLS USED
Read this use and maintenance manual carefully before performing any repairs on the
chiller.
Warnings of a general character; risk of danger or possibility of damaging the machine,
pay particular attention to the phrase following this symbol.
Risk of electrical danger; the phrase highlights conditions that could be fatal. Follow the
instructions provided meticulously.
Risk of danger; component or system under pressure.
Risk of danger; component or system that can reach high temperatures during operation.
Risk of danger; it is absolutely forbidden to use water to extinguish fires near or on the
chiller.
Risk of danger; it is absolutely forbidden to operate the machine with the panel
open.
Service that can be performed by the machine’s operator, if qualified (1).
Water input connection point.
Water output connection point.
Dispose of each type of material in accordance with the requirements of the
country of use.
NOTE
Phrases to be emphasized that do not contain safety rules.

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7425MUM651 Model: QBS - Use and Maintenance Manual Rev. 02
This chiller has been carefully designed and constructed to be environmentally
friendly:
• Refrigerants without CFC;
• Expanded foam insulation without CFC;
• Energy-saving techniques;
• Reduced noise;
• The chiller and its packing materials are recyclable.
In order not to hinder our efforts, the user is required to obey the simple ecological
warnings indicated by this symbol.
(1) These are persons with the experience, technical preparation and knowledge of standards and
regulations who are qualified to perform the necessary actions and able to recognize and avoid
possible dangers while handling, installing, using and maintaining the machine.
1.2 WARNINGS
Only qualified persons may use and maintain electrically-powered equipment.
Before commencing maintenance operations ensure no parts of the machine a re
live and it cannot be re-connected to the electrical power supply.
The QBS chillers contain R134A refrigerant.
Operations on the cooling circuit must only be performed by specialist personnel with
suitable equipment.
Any modifications to the machine or related operating parameters not previously
verified and authorized by the Manufacturer may be hazardous and will invalidate
the guarantee.
Do not use water to extinguish fires near or on the chiller.
1.3 PROPER USE OF THE CHILLER
QBS units are packaged air-cooled water chillers.
They are intended for use in industrial process or air -conditioning systems requiring chilled water.
Any other use is considered as incorrect.
The manufacturer is not liable for damage resulting from inappropriate us e; in all cases, the user is
liable for any resulting hazards.
Proper use requires conforming to the installation conditions and limits of ope ration (see
sections 3.5 and 7). In particular:
• Power voltage and frequency;
• Pressure, temperature of incoming water;
• Water flow rate;
• Surrounding temperature.
The chiller has been tested and completely assembled. The user must only make the connections to
other systems, as described in the chapters that follow.

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7425MUM651 Model: QBS - Use and Maintenance Manual Rev. 02
1.4 INSTRUCTIONS FOR USING EQUIPMENT UNDER PRESSURE CONFORMING TO
PED DIRECTIVE 2014/68/EU
The proper use of equipment under pressure is an essential prerequisite for ensuring safety.
To this end, the user must proceed as follows:
• Use the equipment properly within the temperature limits shown in the operating limits stated
on the manufacturer’s name/data plate;
• Do not solder on the exchangers or refrigerant fluid pipes;
• Do not install the equipment in insufficiently ventilated rooms, areas exp osed to sources of heat
or near inflammable substances;
• During operation, the equipment must not be subjected to vibrations that could cause fatigue
failures;
• Keep the documentation attached to the equipment (user manual, declaration of conform ity,
etc.) for future reference;
• The maximum working pressure stated on the manufacturer’s data plate must not be exceeded.
Prior to use, the user must fit safety/pressure relief devices.

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2
OPERATION AND MAIN COMPONENTS
2.1 REFRIGERANT CIRCUIT
QBS chillers use a vapour-compression cycle in a refrigerant circuit that essentially consists of the
following components: evaporator, compressor, condenser, lamination device (capillary tube).
Evaporator: heat exchanger (tube and fins) to enable heat exchange between the water and the
refrigerant liquid without them coming into contact with each other. The water is cooled when it
passes through the evaporator.
Compressor: compresses the steam from the evaporator to send it to the condenser at a higher
pressure.
Condenser: tube and fins exchanger to enable heat exchange between the refrigerant and the air; it
creates refrigerant gas condensation transferring the gas refrigerant condensation heat to the air
(which flows externally); high pressure refrigerant liquid is thus produced.
Lamination device: reduces the pressure of the liquid refrigerant coming from the condenser, which
is then sent to the evaporator.
Thanks to these components, the vapour-compression cycle works as follows: the refrigerant liquid
evaporates in the evaporator, chilling the water; the refrigerant vapours a re then aspirated from the
compressor, which compresses them and sends them to the condenser under high pressure; here,
thanks to a flow of forced air from the fans, the high-pressure refrigerant gas is cooled, making it
condensed and undercooled.
The flow of refrigerant liquid then passes through the lamination valve (thermostatic expansion
valve), which drastically reduces its pressure: the refrigerant liquid returns to the evaporator at a
reduced pressure where it again evaporates, taking heat from the water.
The refrigerant circuit also includes a water pump, which ensures the flow of water to be chilled by
evaporation, and the fan which ensures the condenser is cooled.
2.2 WATER CIRCUIT
The water circuit mainly consists of a pump, evaporator, tank.
The water flows into the evaporator first where it is cooled, then into the tank, and is then suctioned
by the pump which sends it to the system (see Water diagram section 11).
All QBS units have an open circuit with a tank at atmospheric pressure.
See chapter 11 Water diagram.
2.3 FAN
The fan forces air through the condenser fins to remove the refrigerant gas condensation heat,
therefore limiting the pressure inside the condenser.
QBS chillers are equipped with axial fans and have internal heat protection for the motor windings.
2.4 CONDENSATION CONTROL
When the ambient air temperature decreases, air flow cooling capacity increases slightly, causing a
reduction in pressure inside the condenser; to limit this decrease in condensation pressure from falling
below acceptable limits for good cooling circuit operation the fan stops temporarily.

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7425MUM651 Model: QBS - Use and Maintenance Manual Rev. 02
2.5 CONTROL OF THE WATER TEMPERATURE
The purpose of the chiller is to maintain the temperature of the water produced within a desired
interval as the load on the system varies; this is handled by an electronic controller and a temperature
probe that turn the compressors on and off appropriately (see also sections 5.3).
2.6 PROTECTING THE INTEGRITY OF THE MACHINE
In addition to controlling the temperature, the electronic controller uses pressure switches, thermostats
and timers to prevent and handle situations that could compromise the integrity of the machine (also
see Chapter 6 Safety Devices).
2.7 QBS UNITS: IDENTIFICATION OF THE MAIN COMPONENTS
04 High pressure switch
06 Compressor
08 Condenser
9.1 Fan
10 Refrigerant filter
11 Capillary tube
12 Temperature probe
17 Electronic controller
18 Evaporetor
22 Disconnector switch
61 Power input
90 Pump
91 Tank
93 Level indicator
95 Water input
96 Water output
97 Drain
99 Pressure plug

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2.8 SPARE PARTS
Spare parts list is printed on a dedicated sticker applied inside the chiller. On this sticker each spare
part is identified with its ID Number and related Spare Part Number. Here below the cross reference
table between ID Number and exploded drawings Ref. With their description and quantity installed
inside chillers.
NOTE To order the suggested spare parts or any other part, it is necessary to quote the data
reported on the identification plate.

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3
INSTALLATION
3.1 TRANSPORT
The units are supplied packed in a cardboard box on a wooden pallet.
After checking that the packing is undamaged, position the unit near the installation site and unpack
it.
Always keep the chiller vertical: turning it upside down can irreparably damage several
parts of the unit.
Handle with care. Violent falls can cause irreparable damage.
The centre of the machine is approximately its centre of gravity. In any case, when handling
the machine with a forklift truck or pallet jack, always check its stability before lifting.
3.2 STORAGE
Protect the machine from bad weather, even if packed.
Always keep the chiller vertical, even when in storage. Turning it upside down can irreparably
damage several parts of the unit.
If not used, the chiller can be stored packed in an enclosed place, free of dust, with a maximum
temperature of 50 °C//122°F and specific humidity of not higher than 90%.
The packing material is recyclable.
Dispose of each type of material in accordance with the requirements in the
country of use.
3.3 PLACE OF INSTALLATION
Warning! The QBS 001÷002 models are suitable for indoor installation only.
To determine the best place to install the unit, it is important to consider the following aspects:
• The dimensions and source of the water pipes;
• The location of the power supply;

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7425MUM651 Model: QBS - Use and Maintenance Manual Rev. 02
• The solidity of the support surface;
• Avoid any obstacles to the flow of the fan which could cause the recirculation of air to the
condenser;
• Avoid the possible reflection of sound waves: (do not install in narrow or tight spaces);
• Provide access for maintenance or repair (see paragraph 3.3.1 Installation spaces);
• Average air temperature in the chosen installation area (see Section 7 Operating limits).
Attention! If the machine is installed outside, it could find itself at a temperature lower
than 0°C//32°F, when stopped; the formation of ice could damage the
evaporator. If you do not intend to drain the machine during the winter, you
must add anti-freeze to the water circuit (see paragraph 3.4.3 Use of
ethylene glycol as a winter anti-freeze).
3.3.1 Installation spaces
To ensure the good functioning of the unit and access for maintenance, you must respect the minimum
installation space shown in the figure in this paragraph. The exit of air from the fan must not be
obstructed. In any case, avoid all situations in which hot air can circulate between the output of the
fan and the intake of the machine. Contact our office to verify feasibility in all cases where one of the
preceding conditions cannot be met.
QBS 001÷002
• 800mm/31inches on each side
3.4 WATER CONNECTIONS
Connect the machine to the water pipes following the instructions located near its water fittings (see
figures).
The installation of outlet and inlet taps on the machine is recommended, which will enable machine
maintenance without emptying the entire system, and emptying of the machine only during winter
downtime.
Important! Install the mechanical water filter on its input: scum and impurities can
seriously damage the evaporator.

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We recommend an extraordinary cleaning of the mechanical water filter after the machine
has been running for the first week (also see Chapter 8 Maintenance, inspections and
periodic checks).
Warning! No naked flames should be used during water connection operations, in the
vicinity of or inside the unit.
NOTE It is a good rule that the diameters of the arriving and departing pipes be not less than the
water fittings.
QBS 001÷002
50 Hz
60 Hz
Diameter of the in/out water fittings
3/8” GAS FM
3/8” NPT FF
3.4.1 Recommended water system
QBS 001÷002 units come as standard with a tank at atmospheric pressure, pump and bypass; it is
advisable to also provide the water circuit with:
• A mechanical filter for water in the machine inlet pipes, with mesh no greater than 1mm;
• Machine inlet and outlet taps;
• Inlet and outlet pressure gauges and thermometers for water from the machine, to control its
operation.
Diagram of recommended water circuit for QBS 001÷002 models

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Key
1
Tap
4
Thermometer
2
Mechanical filter
5
System/unit discharge
3
Pressure gauge
3.4.2 Use of ethylene glycol as a winter anti-freeze
Instead of emptying the system in the winter, you can charge the syste m with a mixture of water and a
suitable percentage of ethylene glycol, chosen as a function of the lowest expected temperature of the
outside air.
Percentages of ethylene glycol recommended as a function of the expected temperature of the outside air
Outside air temperature [°C]
0
-5
-10
Outside air temperature [°F]
32
23
14
Percentage of ethylene glycol [%]
10
15
20
Attention! Maximum concentration of ethylene glycol allowed: 20%. For glycol concentrations
higher than 20%, contact our company's sales offices to make sure that the mechanical seal and
the pump motor are suitable for the type and concentration of fluid loaded in the hydraulic system
3.4.3 Charging the water circuit
• Check that the drain taps are turned off;
• Open the system interception devices;
Attention! Make sure that the tube that draws the inlet water to the pump is almost always
fluid-filled. It is also recommend, at least in the very early re -start phase, to
close the liquid outlet port of the chiller to increase the pump's prevalence.
This will avoid premature failure of the impeller and will extend the life of
mechanical seal. Also, the engine will not overheat.
• Feed the water from the filling inlet above the machine until the water reaches the required level
(near the transparent level indicator – see diagram). When the pump starts check the level
again and top up if necessary;
• Check for any leaks by examining the circuit.
Water level indicator

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3.5 ELECTRICAL CONNECTIONS
The machine must be connected to the electricity following the electrical diagram and
conforming to the current laws and regulations in the place of installation.
• The voltage, frequency and number of phases must conform to the data shown on the machine's
identification plate;
• The power supply voltage must not vary by more than ±10% from its nominal value ;
• The frequency must not vary by more than ±1% from its nominal value (±2% for brief periods);
• The imbalance between power phases must be <2%;
• Upstream from the electrical panel, install a differential switch (IDn=0.03A) (main power
switch) and slow-blow fuses with the specifications shown on the electrical diagram;
• Use wires of the section shown on the electrical diagram and in the following table.
Attention! Never change the internal electrical connections, as the warranty will be
immediately voided.
Important! Screw the wires solidly to the terminal strip of the cut-off switch and lock the
wire with a cable-gland.
Important! Make the cable entering the machine enters the cable -gland from below: this
prevents rain from dripping inside the machine.
Important! The earth connection is mandatory: connect the earth wire to the terminal
provided in the electrical panel. The ground wire must be longer than the other
wires so that it will be the last one to be pulled if the device holding the cable
loosens.

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4
PRELIMINARY CHECKS AND START-UP
4.1 PRELIMINARY CHECKS AND PREPARATION FOR THE FIRST START-UP
Before starting up the unit, it is a good idea to do the following:
• Check that the water shut-off valves are open;
• Verify the regular water level in the tank;
Attention! Make sure that the tube that draws the inlet water to the pump is almost always
fluid-filled. It is also recommend, at least in the very early re -start phase, to
close the liquid outlet port of the chiller to increase the pump's prevalence.
This will avoid premature failure of the impeller and will extend the life of
mechanical seal. Also, the engine will not overheat.
• Check that the surrounding temperature is in the range for the machine to function (see Chapter
7 Operating Limits);
• Check the cut-off switch on the machine switchboard is open;
• Check that the mains voltage matches the voltage on the machine's identification plate with a
tolerance of ±10%;
• Close the main power supply switch;
• Close the cut-off switch on the machine's electrical panel.
4.2 STARTUP
Connect the device power supply. Touch the for 4 seconds. The led will flash and turn off, the
chiller will switch on.
The controller will display the temperature of the water inside the tank - if it is higher than the set
value the compressor will start up.
To disable, touch the for 4 seconds. The led will flash and turn on, the chiller will switch off.
4.3 START-UP UNDER CRITICAL CONDITIONS
The consequence of starting up under critical conditions could be the intervention of the high-pressure
pressure switch (to rearm the high-pressure pressure switch, see paragraph 6.2 Rearming the high-
pressure pressure switch).
To overcome this problem, you will have to reduce the thermal load on the machine by shutting off
some of the uses or, if this is not possible, by reducing the flow of water into the evaporator: partially
close the output tap from the chiller and restart the machine.
Operate the chiller under these conditions until the water temperature gradually returns within
operating limits; then, you can turn on the tap completely.

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5
ELECTRONIC CONTROLLER – QBS STANDARD
The QBS 001÷002 electronic controller:
• Displays the temperature of the water exiting the water chiller;
• Enables the required temperature of the chilled water to be set (set point);
• Enables compressor activation and deactivation (standby);
• Controls on/off compressor operation depending on the temperature of the water measured with
the set point and upper differential (3°C//3K//5,4°F);
• Guarantees minimum compressor on/off times to maintain its integrity;
• Signals any faults in the temperature probe.
5.1 MAIN FUNCTIONS OF THE ELECTRONIC CONTROLLER BUTTONS AND MEANINGS
OF THE ICONS
Button
Function
On/off button
Exit procedure
Setting setpoint
Access the menu
Down key
Up key
Display/Led
Function
Indicates the state of compressor:
On: compressor ON
Off: compressor OFF
Flashing: setting setpoint mode or compressor protection
Indicates the state of the fans:
On: fan ON
Off: fan OFF
Flashing: fan stopping
Auxliary led
Energy saving on
°Celsius unit
°Fahrenheit unit
Indicates the state of the chiller:
On: chiller OFF
Off: chiller ON

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The display shows alarms like in the following table.
Sign
Description
Type of rearm
iA
Multifunction input alarm
Pressure switch alarm
Manual
Pr1
Probe AI1 failure
Automatic
Pr2
Probe AI2 failure
Automatic
AL
Minimum temperature AI1 probe - Antifreeze
Automatic
AH
Maximum temperature AI1 probe
Automatic
COH
Superheated condenser
Automatic
CSd
Blocked condenser
Automatic
5.2 TURNING ON AND OFF
Connect the device power supply. Touch the for 4 seconds. The led will flash and turn off, the
chiller will switch on.
To disable, touch the for 4 seconds. The led will flash and turn on, the chiller will switch off.
5.3 CONTROLLING WATER TEMPERATURE
The QBS’s electronic controller regulates the outlet water temperature on the basis of a set point
value and an upper differential of 3°C//3K//5,4°F according to the following diagram:
5.4 CHANGING THE SET POINT
Touch the : the flashing led indicates that the setpoint can be changed. Use and
keys within 15 seconds to change the temperature setpoint. Touch key or do not
operate for 15 seconds to confirm the value. Otherwise, touch key, but any changes will not be
saved. The led will switch off and the device will exit the procedure.
5.5 TEMPERATURE DISPLAY AS DETECTED BY THE PROBES
• Make sure that the keyboard is not locked and that no procedure is in progress;
• Touch the key for 4 seconds: the display will show the first label available;
• Touch the or key to select a label Pb1/ Pb2;
• Touch the key to display the corresponding temperature;
• To exit the procedure, touch key or do not operate for 60 seconds;
• Touch the key.

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5.6 LOCKING AND UNLOCKING THE KEYBOARD
To lock the keyboard proceed as follow:
• Make sure that the keyboard is not locked and that no procedure is in progress;
• Do not operate for 60 seconds: the display will show the message ”Loc” for 1 second and the
keyboard shall lock automatically.
To unlock the keyboard:
• Touch a key for 1 second: the display will show the message ”UnL” for 1 second.
5.7 COMPRESSOR OPERATION HOURS
To shoe the compressor operation hours:
• Make sure the keyboard is not locked and that no procedure is in progress;
• Touch the key for 4 seconds: the display will show the first label available;
• Touch the or key to select the label CH;
• Touch the key to display the corresponding compressor’s running hours.
To cancel the compressor operation hours:
• Make sure the keyboard is not locked and that no procedure is in progress;
• Touch the key for 4 seconds: the display will show the first label available;
• Touch the or key to select the label rCH;
• Touch the key;
• Touch the or key within 15 seconds to set a password0F
1;
• Touch the key or do not operate for 15 seconds: the display will show a flashing ”--
--” for 4 seconds, after which the device will exit the procedure.
5.8 SETTING THE CONFIGURATION PARAMETERS
To access the procedure:
• Make sure no procedure is in progress;
• Touch the key for 4 seconds: the display will show ”PA”;
• Touch the key;
• Touch the or key within 15 seconds to set a password1F
2;
• Touch the key or do not operate for 15 seconds: the display will show ”SP”.
To select a parameter:
• Touch the or key;
To set a parameter:
• Touch the key;
• Touch the or key within 15 seconds to set the value as desired;
• Touch the key or do not operate for 15 seconds.
To exit the procedure:
• Touch the key for 4 seconds or do not operate for 60 seconds (any changes will be
saved).
1 Contact our company.
2 Contact our company.