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