PureStream QBS 001 EAA, QBS 001, QBS 002 EAA, QBS 002 User Manual

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PURESTREAM

MINI-CUBE

BY FRIULAIR

QBS Air Cooled Water Chiller

User Manual

Code

Revision

Edition

Changes

7425MUM651

02/2018

Editions Record

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 a nd 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 manuf acturing 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 fr om 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, a nimals 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 w ith, even slightly. When requesting warranty service, you must provide the data on the product's identification plate.

SUMMARY

1 Safety 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

2 Operation 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

3 Installation ................................................................................................................ 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

4 Preliminary 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

5 Electronic 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

6 Autoadaptive 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

7 Operating Limits .................................................................................................... 22

8 SEPR - SEASONAL ENERGY PERFORMANCE RATIO ACCORDING TO

COMMISSION REGULATION (EU) 2016/2281 ................................................................ 22

9 Maintenance, 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

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.

SAFETY RULES

1.1 DEFINITIONS OF THE SYMBOLS USED

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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.

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.

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.

(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

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 use; in all cases, the user is liable for any resulting hazards.

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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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 exchan gers 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 th at 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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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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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

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

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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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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.

The packing material is recyclable. Dispose of each type of material in accordance with the requirements in the country of use.

Warning! The QBS 001÷002 models are suitable for indoor installation only.

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.

3.2 STORAGE

Protect the machine from bad weather, even if packed. Always keep the chiller vertical, even when in storage. Turning it ups ide down can irreparably damage several parts of the unit. If not used, the chiller can be stored packed in an enclosed plac e, free of dust, with a maximum temperature of 50 °C//122°F and specific humidity of not higher than 90%.

3.3 PLACE OF INSTALLATION

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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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).

QBS 001÷002

• 800mm/31inches on each side

Important! Install the mechanical water filter on its input: scum and impurities can

seriously damage the evaporator.

• 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).

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.

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.

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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.

QBS 001÷002

50 Hz

60 Hz

Diameter of the in/out water fittings

3/8” GAS FM

3/8” NPT FF

NOTE It is a good rule that the diameters of the arriving and departing pipes be not less than the

water fittings.

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

Tap

Thermometer

Mechanical filter

System/unit discharge

Pressure gauge

Outside air temperature [°C]

-5

-10

Outside air temperature [°F]

Percentage of ethylene glycol [%]

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

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.

Water level indicator

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

3.4.3 Charging the water circuit

• Check that the drain taps are turned off;

• Open the system interception devices;

• 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.

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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.

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.

3.5 ELECTRICAL CONNECTIONS

• 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 .

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Attention! Make sure that the tube that draws the inlet water to the pump is almost always

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;

• 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 pa nel.

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 o f 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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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

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

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Sign

Description

Type of rearm

Multifunction input alarm Pressure switch alarm

Manual

Pr1

Probe AI1 failure

Automatic

Pr2

Probe AI2 failure

Automatic

Minimum temperature AI1 probe - Antifreeze

Automatic

Maximum temperature AI1 probe

Automatic

COH

Superheated condenser

Automatic

CSd

Blocked condenser

Automatic

The display shows alarms like in the following table.

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

;

• 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

• 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).

;

Contact our company.

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Button

Function

Setting setpoint

Down key Access the menu

Up key

Display/Led

Function

Indicates the state of the fans:

On: fan ON Off: fan OFF Flashing: fan stopping

°Celsius unit

°Fahrenheit unit

Indicates the presence of alarms

After setting the parameter, suspend power supply flow to the device.

AUTOADAPTIVE CONTROLLER – QBS WITH EAA OPTION

The QBS 001÷002 electronic controller:

• Displays the temperature of the water exiting the water cooler;

• Enables the required temperature of the chilled water to be set (set point);

• Signals any faults in the temperature probe.

6.1 MAIN FUNCTIONS OF THE ELECTRONIC CONTROLLER BUTTONS AND MEANINGS

OF THE ICONS

6.2 TURNING ON AND OFF

Connect the device power supply. To turn on the instrument you have to supply it by the cut -off switch. To turn it off it is enough to cut off the power supply by closing the cut -off switch. The display will shows the outlet water temperature.

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6.3 CONTROLLING WATER TEMPERATURE – STANDARD SETTING

The QBS’s electronic controller regulates the outlet water temperature in function of the ambient temperature. The working setpoint will be relative to the temperature read by probe or temperature read by probe 1 – working setpoint (without sign).

6.4 CHANGING THE SET POINT

Make sure the keyboard is not locked and no procedure is running. To gain access the procedure:

• Press and 4 seconds and the display will show “PA”;

• Press ;

• Press or in 15 seconds to set the password2F

;

• Press or do not operate 15 seconds;

• Press and 4 seconds and the display will show “SP”, the first available parameter.

• Press or to scroll the parameter list until you reach “r0”;

• To select the parameter, press and use or in 15 seconds to modify the setting

value;

• Press to confirm the value or do not operate 15 seconds.

6.5 SHOWING THE TEMPERATURE READ BY PROBE 1 (AMBIENT TEMPERATURE)

Make sure the keyboard is not locked and no procedure is running.

• Press 2 seconds: the dispaly will show the first available label;

• Press or to select “Pb1”;

• Press to show the setting value.

6.6 SHOWING THE TEMPERATURE READ BY PROBE 2 (OUTLET WATER TEMPERATURE)

Make sure the keyboard is not locked and no procedure is running.

• Press 2 seconds: the dispaly will show the first available label;

• Press or to select “Pb2”;

Press to show the setting value.

Contact our company.

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Code

Description

Type of rearm

AL1

Minimum temperature probe 1 (ambient temperature)

Automatic

AL2

Maximum temperature probe 2 (outlet water temperature)

Automatic

Pr1

Probe 1 error

Automatic

Pr2

Probe 2 error

Automatic

Loc

Keyboard and/or setpoint are locked

---

----

The quantity to show is not available

---

6.7 LOCKING/UNLOCKING THE KEYBOARD

Make sure the keyboard is not locked and no procedure is running.

• Press and 2 seconds: the display will show “Loc” 1 second.

If the keyboard is locked, you will not be allowed to:

• Show the temperature read by probe 1 and probe 2;

• Modify the working setpoint.

This operations provoke the visualization of the label “Loc” 1 second. To unlock the keyboard:

• Press and 2 seconds: the display will show “UnL” 1 second.

6.8 ALARMS

The display will show the following code of alarm.

6.9 SETTING CONFIGURATION PARAMETERS

To gain access the procedure:

• Press and 4 seconds and the display will show “PA”;

• Press ;

• Press or in 15 seconds to set the password3F

• Press or do not operate 15 seconds;

• Press and 4 seconds and the display will show “SP”, the first available parameter.

• Press or to scroll the parameter list;

• To select a parameter, press and use or in 15 seconds to modify the setting

value;

• Press to confirm the value or do not operate 15 seconds.

;

Contact our company.

7425MUM651 Model: QBS - Use and Maintenance Manual Rev. 02

Parameter

Function

Factory setting

Working setpoint

0°C//32°F

Working setpoint differential

Minimum working setpoint

0°C//32°F

Maximum working setpoint

25°C//77°F

Type of working setpoint:

• Absolute setpoint r6=0

• Relative setpoint r6=1: temp. read by probe 1 – working setpoint

Forced off of compressors

4°C//39,2°F

Differential of parameter r7

[At r7+r8 value the compressor could be switched on]

Temperature the alarm of low temperature is activated AL1

4°C//39,2°F

Temperature the alarm of high temperature is activated AL2

50°C//122°F

A10

Differential of parameter A1

[At A1+A10 value the alarm AL1 will be deactiveted]

A11

Differential of parameter A4

[At A4-A11 value the alarm AL2 will be deactiveted]

Parameter

Function

Suggested value

Minimum working setpoint

6°C//42,8°F

Type of working setpoint:

• Absolute setpoint r6=0

• Relative setpoint r6=1: temp. read by probe 1 – working setpoint

6.10 TABLE OF STANDARD PARAMETERS CONFIGURATION

Below there is a table of most important parameters and their factory setting. To modify the parameter contact our company.

6.11 ALTERNATIVE METHOD OF TEMPERATURE REGULATION

The electronic controller allows to regulate the outlet working temperature with an absolute logic in function of the temperature read by probe 1. In that way, the SP value is the absolute regulation setpoint like in the following image.

To set this kind of working mode, please set the following values in that way (see paraghaph 5.9 Setting configuration parameters).

7425MUM651 Model: QBS - Use and Maintenance Manual Rev. 02

Dangerous situation

Safety device

Location

High condensation pressure

High-pressure switch

Compressor output pipe

Low water temperature

Anti-freeze thermostat

Water exit from the evaporator

Frequent compressor start-ups

Anti-circulation timer

Electronic controller Low water level in the tank

Water-level sensor

Tank

For some safety devices, once the cause of the alarm times out, the machine resumes operation automatically as soon as the reset value is reached. Others must be manually reset to restart the machine. The following paragraph lists the characteristics of each safety device.

Safety device

Intervention value

Reset value

Type of rearm

High-pressure gauge

30 barg//435 psi

23 barg//334 psi

Manual

Anti-freeze thermostat

4°C//39,2°F

6°C//42,8°F

Semiautom.

Water-level sensor

Semiautom.

Anti-circulation timer*

5 min.

Safety Devices QBS chillers have a series of safety devices that limit the machine's temperature and pressure values to ensure that it operates within the expected limits and to avoid dangerous situations. Here is a list of dangerous situations, including the relative safety device and its location.

Legend: n.a. not available – Opt.: optional

When they reach their calibration value, most of the security devices trigger an alarm managed by the electronic controller.

6.1 CALIBRATION OF THE SAFETY DEVICES AND TYPE OF REARM

* This is a function of the electronic controller that prevents the same compressor from stopping and starting too frequently: at least 5 minutes must elapse between one compre ssor’s power up and the next.

7425MUM651 Model: QBS - Use and Maintenance Manual Rev. 02

Warning! The upper part of the compressor casing and discharge pipe are at a high

temperature.

Be especially careful when working in their vicinity.

High pressure switch

For this reason, when dealing with an intervention of the high-pressure switch, it is necessary to:

A) Identify the cause of the rise in pressure (fan not working,

condensation coil dirty or obstructed, obstacles to the flow of exiting air, operating temperature outside operating limits, etc. (also see Chapter 9 Troubleshooting) and remove the cause, if possible;

B) Wait until the high-pressure manometer falls below the reset

value (see the table, “Calibration of the safety devices and type of rearm” in paragraph 6.1);

C) Rearm the pressure switch by pressing the red button: if you do

not hear a click, it is not rearmed;

D) Then rearm the electronic controller.

Attention! The high-pressure gauge stops the compressor while it keeps the condenser fan

running to lower the pressure in the condenser .

6.2 REARMING THE HIGH-PRESSURE PRESSURE SWITCH

The intervention of the high-pressure pressure switch is the only case in which, in addition to manually rearming the electronic controller, it is also necessary to reset the pressure switch itself. The high-pressure pressure switch is located in the compressor compartment on the uninsulated copper pipe that goes from the compressors to the condensation coil; there is a manual-reset button on top of it.

This can only be rearmed when the pressure in the circuit has fallen below the reset value (see table Calibration of the safety devices and type of rearm in paragraph 6.1).

7425MUM651 Model: QBS - Use and Maintenance Manual Rev. 02

230V/1Ph/50Hz

Model QBS

001

002

SEPR

4,16

4,37

OPERATING LIMITS

The graphs show the limits for continuous operation of the QBS units, in relation to the temperature of the water exiting the machine, and the temperature of the external air.

QBS 001÷002

SEPR - SEASONAL ENERGY PERFORMANCE RATIO

ACCORDING TO COMMISSION REGULATION (EU) 2016/2281

Only for units at 50Hz power supply.

7425MUM651 Model: QBS - Use and Maintenance Manual Rev. 02

To keep the machine running properly and providing the guaranteed performance required, it is necessary to make some periodic checks.

Operation

Frequency

Execution

Check that the temperature of the water produced is in the required interval

Daily

User

Check tank water level using level indicator – see section 3.4.3

Daily

Check for the presence of any alarm signals

Daily

Check the functioning of the fans

Monthly

Check that the temperature of the air is compatible with the operating limits of the machine

Monthly

Clean the condensing coil with a jet of compressed air

Annual (1)

Specialized

personnel

Clean the water filter

Monthly(2)

Check that the subcooling and superheating values are, respectively between 3÷5K//5,4÷9°F and 5÷7K//9÷12,6°F

Every 6 months

Check for traces of oil on the pipes of the refrigerant circuit (symptom of refrigerant leaks)

Every 6 months

Check the tightness of the electrical terminals both inside the electrical panel and on the terminal strips of the compressors

Yearly

Check the contacts of the contactors; if they show signs of deterioration, replace them

Yearly

Check that the current absorbed by the machine is within the values on the identification plate

Every 6 months

Attention! Before carrying out any maintenance on the unit or accessing internal parts,

make sure you have cut-off the electricity.

Attention! The upper part of the compressor housing and the output pipe are hot. Be

especially careful when working near them.

MAINTENANCE, INSPECTIONS AND PERIODIC CHECKS

(1) It may be necessary to carry this out more frequently in the case of particularly dirty environments. (2) We recommend an extraordinary cleaning of the filter after the machine has been operating for the first

week.

(3) It is not necessary to do this if the system has been charged with an anti -freeze solution (water and a

suitable percentage of glycol) (see paragraph 3.4.3 Use of ethylene glycol as a winter anti -freeze).

7425MUM651 Model: QBS - Use and Maintenance Manual Rev. 02

Cause

Alarm or symptom

Solution

Execution

1. The unit does not start

Contacts of the main differential switch are open

Electronic controller off

Close the contacts

User

Unit's electrical panel cut -off switch is open

Electronic controller off

Close the contacts

User

Compressor timer active

The compressor icon on the display of the electronic controller is flashing

Wait (5 mins at the most)

User

No consent from the service thermostat

System water at temperature (see display)

Apply a thermal load to the machine or lower the set point

User

No consent from the antifreeze thermostat

Reset a temperature of the water (setpoint) compatible with the calibration of the antifreeze thermostat

User

Service and anti-freeze probe defective

Check contacts and replace, if necessary

Specialized

personnel

Water temperature probes defective

Pr1/Pr2

Check contacts and replac e, if necessary

Specialized

personnel

Intervention of the main differential switch

Electronic controller off

Look for current leakage inside the machine

Specialized

personnel

2. The compressor does not start

Intervention of the thermal protection inside the compressor

The contactor of the compressor is on but the compressor is stopped

Wait for cooling: check that the compressor is working under normal conditions. Check for insufficient refrigerant in the circuit (see point 6).

Specialized

personnel

Contactor of the compressor off

The compressor icon is on but the compressor is stopped

Check the voltage at the coil of the contactos of the compressor and the continuity of the coil itself

Specialized

personnel

3. The water pump does not make pressure and flow

The suction pipe of the pump is full of air or the pressure drops on the hydraulic circuit are too high

The water pump does not work properly

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 restart phase, to close the liquid outlet port of the chiller to inc rease the pump's pre valence (see

paragraph 3.4.3 Charging the water circuit)

Specialized

personnel

TROUBLESHOOTING

7425MUM651 Model: QBS - Use and Maintenance Manual Rev. 02

Cause

Alarm or symptom

Solution

Execution

4. Intervention of the high pressure pressure switch

Condenser obstructed or insufficient air flow-capacity

Remove di rt from the condenser and any obstacles to the fl ow of air. Wait for the pressu re to drop below the reset val ue, then rearm the high-pressure pressure switch by pressi ng the button on top of it (see figure in parag raph

6.2 ).

User

The unit has operated outside its operating limits (such as air or water too hot)

If possible, restore conditions that are compatible with t he operating limits. Reset the high pressure switc h (pa ragraph 6.2).

User

Fan not working

See point 4

Excessive refrigerant charge

High subcooling (greater than 10K//18°F)

Drain excess refrigerant

Specialized

personnel

Presence of air or incondensable gas in the refrigerant circuit

Presence of bubbles on the flow peep hole, also with subcooling values greater than 5K//9°F

Drain the circuit, create vacuum and recharge

Specialized

personnel

Refrigerant filter clogged or thermostatic valve stuck

Pipe downstream from the component covered with frost

Check and replace

Specialized

personnel

5. Fan doesn't start

Very low outside air temperatures and consequent intervention of the condensation control

Fan icon off. Condensation pressure normal

The machine can working anyway

6. The unit is working without ever stopping

Excessive thermal load

Reduce the thermal load. Reduce the temperature of the incoming water and/or the flow-capacity of the exit tap of the unit a little.

User

No refrigerant

See point 6

7. Compressor intake pipe covered with frost

No refrigerant

High overheating, low underc ooling and high output temperature of the compressor. Traces of oil on the refrigerant circuit.

Check the chiller circuit with a leak detector. Repair any ruptures and recharge the circuit.

Specialized

personnel

8. The unit stops and starts repeatedly; water temperature changes suddenly

Insufficient water flow rate

Check water flow rate. Open the system tap fully. If possible reduce system feed leaks. If possible add a pump in series with suitable head.

Specialized

personnel

7425MUM651 Model: QBS - Use and Maintenance Manual Rev. 02

If the chiller is being dismantled, you must separate it into parts of homogeneous material. The following table lists the main materials of the various components of the machine.

Part

Material

Refrigerant fluid

R134A, Oil

Panelling and supports

Carbon steel, epoxy paint

Chiller compressor

Steel, Copper, Aluminium, Oil

Evaporator

Copper

Condenser

Aluminium, Carbon Steel , Copper

Pipes

Copper

Fan

Aluminium, Copper, Steel

Valves

Steel, Bronze

Insulation

Synthetic rubber without CFC, EPS, Polyurethane

Pump

Steel, Copper

Tank

Stainless steel

Electrical wires

Copper, PVC

Electrical parts

PVC, Copper, Bronze

Dispose of refrigerant properly. Remove it from the chiller with suitable tools and deliver it to authorized collection centres that will treat it and make it reusable.

DISMANTLING THE CHILLER

We recommend that you follow current safety norms for the disposal of each single material. The refrigerant contains particles of lubrication oil from the chiller compressor.

7425MUM651 Model: QBS - Use and Maintenance Manual Rev. 02