Quantech QWC4 Owner's manual

MODEL QWC4
SINGLE COMPRESSOR
60 HZ
120 TONS TO 200 TONS
WATER-COOLED SCREW
LIQUID CHILLERS
INSTALLATION, OPERATION, MAINTENANCE New Release Form QWC4-NM1 (221)
Issue Date:
February 28, 2021
035-28391-000
R-134a

QUANTECH
2
FORM QWC4-NM1 (221)
ISSUE DATE: 02/28/2021
This equipment is a relatively complicated apparatus.
During rigging, installation, operation, maintenance,
or service, individuals may be exposed to certain com-
ponents or conditions including, but not limited to:
heavy objects, refrigerants, materials under pressure,
rotating components, and both high and low voltage.
Each of these items has the potential, if misused or
handled improperly, to cause bodily injury or death. It
is the obligation and responsibility of rigging, instal-
lation, and operating/service personnel to identify and
recognize these inherent hazards, protect themselves,
and proceed safely in completing their tasks. Failure
to comply with any of these requirements could result
in serious damage to the equipment and the property in
IMPORTANT!
READ BEFORE PROCEEDING!
GENERAL SAFETY GUIDELINES
which it is situated, as well as severe personal injury or
death to themselves and people at the site.
This document is intended for use by owner-authorized
rigging, installation, and operating/service personnel. It
is expected that these individuals possess independent
training that will enable them to perform their assigned
tasks properly and safely. It is essential that, prior to
performing any task on this equipment, this individual
shall have read and understood the on-product labels,
this document and any referenced materials. This in-
dividual shall also be familiar with and comply with
all applicable industry and governmental standards and
regulations pertaining to the task in question.
SAFETY SYMBOLS
The following symbols are used in this document to alert the reader to specific situations:
Indicates a possible hazardous situation
which will result in death or serious injury
if proper care is not taken.
Indicates a potentially hazardous situa-
tion which will result in possible injuries
or damage to equipment if proper care is
not taken.
Identies a hazard which could lead to
damage to the machine, damage to other
equipment and/or environmental pollu-
tion if proper care is not taken or instruc-
tions and are not followed.
Highlights additional information useful
to the technician in completing the work
being performed properly.
External wiring, unless specied as an optional connection in the manufacturer’s product line, is
not to be connected inside the control cabinet. Devices such as relays, switches, transducers and
controls and any external wiring must not be installed inside the micro panel. All wiring must be
in accordance with Quantech’ published specications and must be performed only by a qualied
electrician. Quantech will NOT be responsible for damage/problems resulting from improper con-
nections to the controls or application of improper control signals. Failure to follow this warning
will void the manufacturer’s warranty and cause serious damage to property or personal injury.

QUANTECH 3
FORM QWC4-NM1 (221)
ISSUE DATE: 02/28/2021
MANUAL DESCRIPTION FORM NUMBER
QWC4 Chiller Installation Checklist QWC4-CL1
QWC4 Chiller Start-up Checklist and Request for Authorized Start-up Technician QWC4-CL3
QWC4 Renewal Parts QWC4-RP1
Limited Warranty QTC-NM2
ASSOCIATED LITERATURE
CHANGEABILITY OF THIS DOCUMENT
In complying with Quantech’s policy for continu-
ous product improvement, the information contained
in this document is subject to change without notice.
Quantech makes no commitment to update or provide
current information automatically to the manual or
product owner. Updated manuals, if applicable, can be
obtained by contacting the nearest Quantech Service
office or accessing the Johnson Controls Knowledge
Exchange website at https://docs.johnsoncontrols.com/
chillers/.
It is the responsibility of rigging, lifting, and operating/
service personnel to verify the applicability of these
documents to the equipment. If there is any question
regarding the applicability of these documents, rig-
ging, lifting, and operating/service personnel should
verify whether the equipment has been modified and
if current literature is available from the owner of the
equipment prior to performing any work on the chiller.

QUANTECH
4
FORM QWC4-NM1 (221)
ISSUE DATE: 02/28/2021
QWC4
MOD
LEVEL
EVAP
TUBES*
BB
BC
BD
CB
CC
CD
DB
DC
DD
MB
MC
MD
ME
NB
NC
ND
NE
M2
M3
M4
M5
N2
N3
N4
N5
UNIT TYPE
Quantech Variable Speed
Screw Water-Cooled Chiller
Design Series
MB
COND
TUBES*
BB
BC
BD
CB
CC
CD
DB
DC
DD
MB
MC
MD
ME
NB
NC
ND
NE
M2
M3
M4
M5
N2
N3
N4
N5
MB
APPLICATION
S=Std Water Chiller
D=Dry Tower/Radiator
P=Process Brine
T=Ice Thermal Storage
A=Heat Pump
S
X=NO SELECTION
Q=SPECIAL
QUOTE
XA
CMPR
FX=(1) 145 mm
GX=(1) 151 mm
EE=(2) 136/136 mm
FE=(2) 145/136 mm
FF=(2) 145/145 mm
EE
PASS
A=Evap: 1-pass; Cond: 1 pass
B=Evap: 2-pass; Cond: 1 pass
C=Evap: 3-pass; Cond: 1 pass
D=Evap: 1-pass; Cond: 2 pass
E=Evap: 2-pass; Cond: 2 pass
F=Evap: 3-pass; Cond: 2 pass
G=Evap: 1-pass; Cond: 3 pass
H=Evap: 2-pass; Cond: 3 pass
I =Evap: 3-pass; Cond: 3 pass
B
STARTER
A=2 CMPR VSD Frame A
B=2 CMPR VSD Frame B
C=2 CMPR VSD Frame C
D=2 CMPR VSD Frame D
J=1 CMPR VSD Frame B
L=1 CMPR VSD Frame D
R=1 CMPR Air Cooled Frame A
S=1 CMPR Air Cooled Frame B
T=1 CMPR Air Cooled Frame C
U=1 CMPR Air Cooled Frame D
A
NOMINAL
CAP
0150
*First letter represents tube size. The second
letter designates the number of tubes.
Nomenclature

QUANTECH 5
FORM QWC4-NM1 (221)
ISSUE DATE: 02/28/2021
TABLE OF CONTENTS
SECTION 1 - GENERAL CHILLER INFORMATION AND SAFETY ................................................................. 11
Introduction..................................................................................................................................................... 11
About this Manual........................................................................................................................................... 11
Warranty ......................................................................................................................................................... 11
Quality Assurance .......................................................................................................................................... 11
Fluorinated Greenhouse Gases .....................................................................................................................12
Responsibility for Safety.................................................................................................................................12
Misuse of Equipment......................................................................................................................................12
SECTION 2 - PRODUCT DESCRIPTION............................................................................................................15
Components ...................................................................................................................................................15
Semi-Hermetic Quantech Screw Compressors .............................................................................................19
Evaporator .....................................................................................................................................................19
Condenser .....................................................................................................................................................19
Refrigerant Circuit .........................................................................................................................................19
Complete Factory Package ...........................................................................................................................19
Electrical ........................................................................................................................................................19
Building Automation System Capabilities ......................................................................................................19
Microcomputer Control Center ....................................................................................................................... 20
Options ...........................................................................................................................................................20
SECTION 3 - HANDLING, STORAGE, INSTALLATION, AND REASSEMBLY...............................................23
Shipment and Storage.................................................................................................................................... 23
Inspection, Damage, and Shortage................................................................................................................25
Lifting Weights................................................................................................................................................26
Moving the Chiller for Forms 1 and 2 ............................................................................................................. 27
Foundation .....................................................................................................................................................28
Clearance for Service ....................................................................................................................................28
Installing Elastomeric Vibration Isolator Pads ................................................................................................ 29
Installing Optional Spring Isolators.................................................................................................................30
Form 7 Reassembly ....................................................................................................................................... 31
Piping Joint Assembly ....................................................................................................................................46
Pipe Thread Joints..........................................................................................................................................46
Gasket Joints.................................................................................................................................................. 47
Torque Values................................................................................................................................................. 48
Refrigerant Tubing Reassembly .....................................................................................................................48
Brazed Joints .................................................................................................................................................50
Piping Connections ........................................................................................................................................52
Check for Piping Alignment ............................................................................................................................ 52
Condenser and Chilled Liquid Piping ............................................................................................................52
General Requirements ...................................................................................................................................52
Water Treatment.............................................................................................................................................53
Pipework Arrangement ...................................................................................................................................54
Minimum Water Volume .................................................................................................................................54
Leaving Water Temperature Out of Range.....................................................................................................54
Nozzle Connections .......................................................................................................................................55
Options for Flanges ........................................................................................................................................55
Refrigerant Relief Piping ...............................................................................................................................55

QUANTECH
6
FORM QWC4-NM1 (221)
ISSUE DATE: 02/28/2021
TABLE OF CONTENTS (CONT'D)
Unit Piping ......................................................................................................................................................57
Electrical Connection...................................................................................................................................... 57
Power Wiring ..................................................................................................................................................57
Power Supply Wiring ......................................................................................................................................57
115 VAC Control Supply Transformer.............................................................................................................57
Control Wiring................................................................................................................................................. 57
System Inputs................................................................................................................................................. 58
Analog Inputs .................................................................................................................................................58
SECTION 4 - TECHNICAL DATA.........................................................................................................................65
Single Compressor Unit Dimensions.............................................................................................................. 72
Dimensions of Evaporator Nozzle Arrangements...........................................................................................74
Dimensions of Condenser Nozzle Arrangements...........................................................................................75
SECTION 5 - COMMISSIONING..........................................................................................................................77
Preparation.....................................................................................................................................................77
First Time Start-up..........................................................................................................................................77
SECTION 6 - OPERATION ...................................................................................................................................83
Operating Controls .........................................................................................................................................83
Basic Operating Sequence............................................................................................................................. 84
User Interface.................................................................................................................................................88
Fault Messages ..............................................................................................................................................91
Microboard (331-03478-xxx) ..........................................................................................................................91
Program Update .............................................................................................................................................93
Data Logging ..................................................................................................................................................94
Acceptable Printers ......................................................................................................................................123
Printer Connections......................................................................................................................................123
Printer Setup ................................................................................................................................................123
Printing a Report ..........................................................................................................................................124
BAS Communications ..................................................................................................................................128
SECTION 7 - MAINTENANCE ...........................................................................................................................131
General Requirements .................................................................................................................................131
Daily Operating Inspections .........................................................................................................................132
Compressor Oil ............................................................................................................................................132
Oil Filter Replacement..................................................................................................................................135
Refrigerant Charging ....................................................................................................................................137
Handling Refrigerant for Dismantling and Repairs .......................................................................................137
Checking System for Leaks.......................................................................................................................... 138
Refrigerant Leak Checking...........................................................................................................................138
Pressure Connections ..................................................................................................................................138
Testing for Evaporator and Condenser Tube Leaks .....................................................................................139
Evacuation and Dehydration of Unit.............................................................................................................140
Condensers and Evaporators Maintenance .................................................................................................142
Cleaning Evaporator and Condenser Tubes ................................................................................................142
Compressor Maintenance ............................................................................................................................144
Electrical Controls ........................................................................................................................................144

QUANTECH 7
FORM QWC4-NM1 (221)
ISSUE DATE: 02/28/2021
TABLE OF CONTENTS (CONT'D)
SECTION 8 - TROUBLESHOOTING.................................................................................................................147
Abnormal Operation, Analysis and Correction ............................................................................................. 147
Troubleshooting the Compressor and Oil Separation System ..................................................................... 147
SECTION 9 - DECOMMISSIONING, DISMANTLING, AND DISPOSAL........................................................153

QUANTECH
8
FORM QWC4-NM1 (221)
ISSUE DATE: 02/28/2021
LIST OF FIGURES
FIGURE 1 - Emergency Shutdown Handle ............................................................................................................13
FIGURE 2 - QWC4 Chiller Major Components (Front View) ..................................................................................16
FIGURE 3 - QWC4 Chiller Major Components (Rear View)...................................................................................17
FIGURE 4 - Basic System Control and VSD System Architecture .........................................................................18
FIGURE 5 - Control Center User Interface .............................................................................................................20
FIGURE 6 - Head Pressure Control System ..........................................................................................................22
FIGURE 7 - Unit Rigging for Forms 1 and 2 ...........................................................................................................27
FIGURE 8 - Service Clearance Requirements .......................................................................................................28
FIGURE 9 - Elastomeric Vibration Isolator Pad Mounts (Standard) - Inches (mm)................................................29
FIGURE 10 - Spring Isolators, in. (mm)..................................................................................................................30
FIGURE 11 - Rigging the Evaporator .....................................................................................................................33
FIGURE 12 - Condenser Rigging ...........................................................................................................................34
FIGURE 13 - Isolator Installation............................................................................................................................35
FIGURE 14 - Heat Exchanger Shipping Brackets ..................................................................................................37
FIGURE 15 - Heat Exchanger Pipes ......................................................................................................................37
FIGURE 16 - Liquid Injection Piping.......................................................................................................................38
FIGURE 17 - Filter Drier and Piping .......................................................................................................................38
FIGURE 18 - Driveline (Compressor/Motor) Assembly ..........................................................................................39
FIGURE 19 - Oil Separator Discharge Piping on Single Compressor Units...........................................................41
FIGURE 20 - Transducer, Eductor and Oil Return Piping ......................................................................................42
FIGURE 21 - Oil Supply Piping...............................................................................................................................42
FIGURE 22 - Variable Speed Drive (VSD) .............................................................................................................44
FIGURE 23 - Control Panel ....................................................................................................................................45
FIGURE 24 - VSD Cooling Hoses ..........................................................................................................................45
FIGURE 25 - Alternate Piping for VSD ...................................................................................................................46
FIGURE 26 - Torque Pattern ..................................................................................................................................47
FIGURE 27 - Adjustable End Fitting .......................................................................................................................48
FIGURE 28 - Back O󰀨 Locknut...............................................................................................................................49
FIGURE 29 - Screw Fitting Into Port.......................................................................................................................49
FIGURE 30 - Torque Fitting ....................................................................................................................................49
FIGURE 31 - SAE or ISO 6149 Straight Thread O-ring Port ..................................................................................49
FIGURE 32 - Brazed Joints ....................................................................................................................................51
FIGURE 33 - Schematic of a Typical Piping Arrangement .....................................................................................54
FIGURE 34 - Leaving Water Temperature Out-of-Range Suggested Layout ........................................................55
FIGURE 35 - Grooved Nozzle ................................................................................................................................55
FIGURE 36 - Flange Attachment ............................................................................................................................55
FIGURE 37 - Typical Components of Relief Piping ................................................................................................56
FIGURE 38 - Power Connections...........................................................................................................................62
FIGURE 39 - Single Compressor Unit Dimensions ................................................................................................72
FIGURE 40 - Evaporators - Compact Waterboxes (2-Pass) ..................................................................................74
FIGURE 41 - Evaporators - Compact Waterboxes (3-Pass) ..................................................................................74
FIGURE 42 - Condensers - Compact Waterboxes (1-Pass) ..................................................................................75
FIGURE 43 - Condensers - Compact Waterboxes (2-Pass) ..................................................................................75
FIGURE 44 - Condensers - Compact Waterboxes (3-Pass) ..................................................................................75
FIGURE 45 - Keypad and Display..........................................................................................................................83
FIGURE 46 - Control Operation..............................................................................................................................85
FIGURE 47 - Status Key.........................................................................................................................................89
FIGURE 48 - New 331-03478-xxx Microboard.......................................................................................................92
FIGURE 49 - Unit Data Key..................................................................................................................................104
FIGURE 50 - System Data Key ............................................................................................................................105
FIGURE 51 - VSD Data and Operating Hours/Start Counter Keys ......................................................................107
FIGURE 52 - History Key......................................................................................................................................108
FIGURE 53 - Setpoints Key.................................................................................................................................. 110
FIGURE 54 - Setpoint High and Low Limits Dened By Control Range (CR)...................................................... 111

QUANTECH 9
FORM QWC4-NM1 (221)
ISSUE DATE: 02/28/2021
LIST OF FIGURES (CONT'D)
FIGURE 55 - Program Key................................................................................................................................... 112
FIGURE 56 - Options Key .................................................................................................................................... 118
FIGURE 57 - Date/Time and Schedule Key .........................................................................................................120
FIGURE 58 - Manual Override and Print Key.......................................................................................................122
FIGURE 59 - Printer Cable Connection from QWC4 Chiller to a Computer ........................................................122
FIGURE 60 - Printer Cable Connection from QWC4 Chiller to a Serial Printer....................................................123
FIGURE 61 - Sample Printout ..............................................................................................................................125
FIGURE 62 - System Switches and Service Keys................................................................................................127
FIGURE 63 - E-Link Gateway Option...................................................................................................................128
FIGURE 64 - Charging Oil ...................................................................................................................................134
FIGURE 65 - Oil Filter Assembly ..........................................................................................................................135
FIGURE 66 - Oil Eductor Assembly......................................................................................................................136
FIGURE 67 - Motor Windings Diagram ................................................................................................................138
FIGURE 68 - Saturation Curve.............................................................................................................................141

QUANTECH
10
FORM QWC4-NM1 (221)
ISSUE DATE: 02/28/2021
LIST OF TABLES
TABLE 1 - Unit Weight ...........................................................................................................................................26
TABLE 2 - Service Clearance Requirements .........................................................................................................28
TABLE 3 - Evaporator and Condenser Weight, lb (kg)...........................................................................................31
TABLE 4 - Torque Specification .............................................................................................................................32
TABLE 5 - Evaporator Dimensions, in. (mm) .........................................................................................................33
TABLE 6 - Condenser Dimensions, in. (mm) .........................................................................................................34
TABLE 7 - Compressor Weight and Dimensions ...................................................................................................39
TABLE 8 - Oil Separator Weight and Dimensions on Single Compressor Units ....................................................40
TABLE 9 - VSD Weight and Dimensions................................................................................................................43
TABLE 10 - Assembly Compounds ........................................................................................................................46
TABLE 11 - ANSI 150 lb Flange Torque Specifications..........................................................................................47
TABLE 12 - ANSI 300 lb Flange Torque Specifications..........................................................................................47
TABLE 13 - SAE J429 Gr 5 Bolts Torque Specifications........................................................................................48
TABLE 14 - Assembly Torque Metric for Metric Tube Fittings ................................................................................50
TABLE 15 - O-ring Assembly Torque Specifications ..............................................................................................51
TABLE 16 - Brazed Joints ......................................................................................................................................51
TABLE 17 - Water Volume for Applications ............................................................................................................54
TABLE 18 - Evaporator and Condenser Water Capacity (gal/l) ............................................................................ 54
TABLE 19 - Refrigerant Relief Characteristics (Per Valve) ....................................................................................56
TABLE 20 - System Input Connections..................................................................................................................58
TABLE 21 - Lug Data (UL/ASME/CE) - Pin 22/Power Field...................................................................................63
TABLE 22 - Lug Data (GB) - Pin 22/Power Field ...................................................................................................63
TABLE 23 - Voltage Variations ..............................................................................................................................63
TABLE 24 - Complete Pin Number Description......................................................................................................65
TABLE 25 - Evaporator Nozzle Dimensions, in. (mm) ........................................................................................... 74
TABLE 26 - Condenser Nozzle Dimensions, in. (mm) ........................................................................................... 75
TABLE 27 - Water Flow Rate Limits GPM (L/s) (Based Upon Standard Tubes at Design Full Load Conditions).. 76
TABLE 28 - Load Limiting Values...........................................................................................................................86
TABLE 29 - Flash Card Update Error XXXXX........................................................................................................93
TABLE 30 - Data Logging ......................................................................................................................................94
TABLE 31 - Unit Warnings......................................................................................................................................95
TABLE 32 - Unit Safeties (Faults) ..........................................................................................................................97
TABLE 33 - System Safeties (Faults).....................................................................................................................99
TABLE 34 - HPCO Mechanical Cutouts...............................................................................................................101
TABLE 35 - Timer Settings ...................................................................................................................................101
TABLE 36 - Sensor Minimum/Maximum Outputs.................................................................................................106
TABLE 37 - Setpoint Values ................................................................................................................................. 111
TABLE 38 - Program Limits.................................................................................................................................. 113
TABLE 39 - Setup Mode Programmable.............................................................................................................. 116
TABLE 40 - Okidata OKIPOS 441........................................................................................................................123
TABLE 41 - Printout Types ...................................................................................................................................124
TABLE 42 - Real Time Number Errors .................................................................................................................129
TABLE 43 - Operation/Inspection /Maintenance Requirements for QWC4 Chillers.............................................131
TABLE 44 - Compressor Oil Limits.......................................................................................................................133
TABLE 45 - System Pressures.............................................................................................................................140
TABLE 46 - Troubleshooting Guide......................................................................................................................148
TABLE 47 - 3K Temperature Sensor ....................................................................................................................150
TABLE 48 - 3K Temperature Sensor - Evaporator Refrigerant and Eductor Temperature Sensor ......................150
TABLE 49 - Pressure Transducer.........................................................................................................................151
TABLE 50 - SI Metric Conversion.........................................................................................................................154

QUANTECH 11
FORM QWC4-NM1 (221)
ISSUE DATE: 02/28/2021
1
SECTION 1 - GENERAL CHILLER INFORMATION AND SAFETY
INTRODUCTION
Quantech QWC4 chillers are manufactured to the high-
est design and construction standards to ensure high
performance, reliability, and adaptability to all types of
air conditioning installations.
The unit is intended for cooling water or glycol solu-
tions, and is not suitable for purposes other than those
specified in this manual.
ABOUT THIS MANUAL
This manual and any other document supplied with the
unit are the property of Quantech which reserves all
rights. This manual may not be reproduced, in whole
or in part, without prior written authorization from an
authorized Quantech representative.
In addition, this manual:
• Includes suggested best working practices and
procedures, which are issued for guidance only,
and they do not take precedence over the above
stated individual responsibility and/or local safety
regulations.
• Contains all the information required for correct
installation and commissioning of the unit, togeth-
er with operating and maintenance instructions.
• Should be read thoroughly before attempting to
operate or service the unit.
• Contains detailed procedures, including installa-
tion, commissioning and maintenance tasks that
must only be performed by suitably trained and

The manufacturer is not liable for any injury or damage
caused by incorrect installation, commissioning, oper-
ation or maintenance resulting from a failure to follow
the procedures and instructions detailed in the manual.
WARRANTY
Quantech warrants QWC4 chillers in accordance with
the Limited Warranty Engineered Systems Equipment
procedure. Refer to Limited Warranty (Form 50.05-
NM2).
Quantech warrants all equipment and materials against
defects in workmanship and materials for a period of
18 months from the date of shipment or 12 months
from the date of start-up, whichever comes first, unless
labor or extended warranty has been purchased as part
of the contract.
The warranty is limited to parts only replacement and
shipping of any faulty part, or subassembly, which has
failed due to defects in workmanship and materials.
All claims must be supported by evidence that the fail-
ure has occurred within the warranty period, and that
the unit was operated within the designed parameters
specified.
All warranty claims must specify the unit model, serial
number, order number, and run hours/starts. Model and
serial number information is printed on the unit identi-
fication plate.
The unit warranty will be void if any modification to
the unit is carried out without prior written approval
from Quantech. For warranty purposes, the following
conditions must be satisfied:
• The initial start of the unit must be carried out by
trained personnel from an authorized Quantech

• Only genuine Quantech approved spare parts,
oils, coolants, and refrigerants must be used.
• All of the scheduled maintenance operations de-
tailed in this manual must be performed at the
      
personnel.
• Failure to satisfy any of these conditions will au-
tomatically void the warranty. Refer to Limited
Warranty (Form 50.05-NM2) for complete details.
QUALITY ASSURANCE
Units conform with the following directives:
• Equipment Directive (2006/42/EC)
• EMC Directive (2004/108/EC)
• Pressure Equipment Directive (97/23/EC)
• Low Voltage Directive (2006/95/EC)
• Safety Code for Mechanical Refrigeration
(EN378-2 (2008))
• AHRI 550/590 and 551/591 - Water Chilling
Packages using the Vapor Compression Cycle.

QUANTECH
12
FORM QWC4-NM1 (221)
ISSUE DATE: 02/28/2021
SECTION 1 - GENERAL CHILLER INFORMATION AND SAFETY
• GB/T 18430.1 - Water Chilling (Heat Pump) Pack-
ages Using The Vapor Compression Cycle - Part
1: Water Chilling (Heat Pump) Packages For In-
dustrial & Commercial And Similar Applications.
• GB25131 - Safety Requirements For Water Chill-
ers (Heat Pump) Using The Vapor Compression
Cycle.
• GB150/151 - Steel Pressure Vessels/Tubular Heat
Exchangers.
• ANSI/ASHRAE 34 - Number Designation And

• ASHRAE 90.1 - Energy Standard For Buildings
Except Low-Rise Residential Buildings.
• Machinery Directive (2006/42/EC)
• EMC Directive (2004/108/EC)
• Pressure Equipment Directive (97/23/EC)
• Safety Code for Mechanical Refrigeration (EN
378-2)
• Safety of machinery - Electrical Equipment of
Machine (EN 60204-1)
• Manufactured in an EN ISO 9001 accredited or-
ganization
• ISO 9614 – Determination of sound power levels
of noise sources using sound intensity
• Conform to CE Testing Services for construction
of chillers and provide CE Listed Mark
FLUORINATED GREENHOUSE GASES
•     
gases covered by the Kyoto Protocol.
• The global warming potential of the refrigerant
(R-134a) used in this unit is 1300. The refrigerant
quantity is stated in this document.
• 
may not be vented to the atmosphere.
RESPONSIBILITY FOR SAFETY
Every care has been taken in the design and manufac-
ture of the unit to ensure compliance with the safety
requirements. However, the individual operating or
working on any equipment is primarily responsible for:
• Personal safety, the safety of other personnel, and
the equipment.
• Correct utilization of the equipment in accordance
with the procedures detailed in the manual.
MISUSE OF EQUIPMENT
Suitability For Application
The unit is intended for cooling water or glycol so-
lutions and is not suitable for purposes other than
those specified in these instructions. Any use of the
equipment other than its intended use, or operation
of the equipment contrary to the relevant procedures
may result in injury to the operator, or damage to the
equipment. The unit must not be operated outside the
design parameters specified in this manual.
Brine Applications
When the chiller is not running, cold brine must NOT
be run through the evaporator. However, if there is
brine running through the evaporator, there must be
flow through the condenser to prevent tubes from
freezing.
Structural Support
Structural support of the unit must be provided as in-
dicated in these instructions. Failure to provide proper
support may result in injury to the operator, or damage
to the equipment and/or building.
Mechanical Strength
The unit is not designed to withstand loads or stresses
from adjacent equipment, pipework, or structures. Ad-
ditional components must not be mounted on the unit.
Any such extraneous loads may cause structural failure
and may result in injury to the operator, or damage to
the equipment.
General Access
There are a number of areas and features, which may
be a hazard and potentially cause injury when working
on the unit unless suitable safety precautions are taken.
Make sure access to the unit is restricted to suitably
qualified personnel, who are familiar with the potential
hazards and precautions necessary for safe operation
and maintenance of equipment containing high tem-
peratures, pressures, and voltages.

QUANTECH 13
SECTION 1 - GENERAL CHILLER INFORMATION AND SAFETY
FORM QWC4-NM1 (221)
ISSUE DATE: 02/28/2021
1
Pressure Systems
The unit contains refrigerant vapor and liquid under pres-
sure, release of which can be a danger and cause injury.
The user should make sure that care is taken during in-
stallation, operation, and maintenance to avoid damage to
the pressure system. No attempt should be made to gain
access to the component parts of the pressure system other
than by suitably trained and qualified personnel.
Electrical
The unit must be grounded. No installation or main-
tenance work should be attempted on the electrical
equipment without first switching the power off, iso-
lating and locking-off the power supply. Servicing and
maintenance on live equipment must not be attempted.
No attempt should be made to gain access to the con-
trol panel or electrical enclosures during normal opera-
tion of the unit.
Components may also have sharp edges. Reasonable
care should be taken when working in contact with any
components to avoid risk of minor abrasions and lac-
erations.
Refrigerants and Oils
Refrigerants and oils used in the unit are generally non-
toxic, non-flammable, and non-corrosive, and pose no
special safety hazards. Use gloves and safety glasses
when working on the unit. The buildup of refrigerant
vapor, from a leak for example, does pose a risk of as-
phyxiation in confined or enclosed spaces and attention
should be given to good ventilation.
Use only the refrigerant specifically designated for the
unit. Any other type of refrigerant may cause damage
to the equipment and will void the warranty.
High Temperature and Pressure Cleaning
High temperature and pressure cleaning methods (e.g.,
steam cleaning) should not be used on any part of the
pressure system as this may cause operation of the
pressure relief devices. Detergents and solvents, which
may cause corrosion, should also be avoided.
Emergency Shutdown
In case of emergency, the control panel is fitted with an
incoming supply circuit breaker with a red and yellow
handle as shown below, which can be used as the emer-
gency stop for the device. Turn the handle clockwise to
shut down the chiller to the ON position.
FIGURE 1 - EMERGENCY SHUTDOWN HANDLE
LD16422
ON
Safety Labels
For safe operation, read the instructions
first.
Warning: This machine may start auto-
matically without prior warning.
Warning: Hot surface.
Warning: Safety relief valve may dis-
charge gas or liquid without prior warning.
Warning: Isolate all electrical sources of
supply before opening or removing the
cover, as lethal voltages may exist.
General attention symbol.
Warning: On isolating the supply it may
take up to 300 seconds for the capacitor
voltage to fall below 50 volts.

QUANTECH
14
FORM QWC4-NM1 (221)
ISSUE DATE: 02/28/2021
THIS PAGE IS INTENTIONALLY LEFT BLANK.

QUANTECH 15
FORM QWC4-NM1 (221)
ISSUE DATE: 02/28/2021
2
SECTION 2 - PRODUCT DESCRIPTION
COMPONENTS
The QWC4 chiller, as shown in Figure 2 on page 16
and Figure 3 on page 17, consists of:
• 
• 
• A water-cooled condenser
• One economizer heat exchanger
• One oil separator
• VSD
• Control panel
The oil separator uses no moving parts. Oil cooling is
accomplished by refrigerant leaving the eductor and
flashing in the suction line, which cools the oil, motor,
and compressor.
An integral liquid cooled, transistorized, pulse-width
modulated (PWM) VSD is controlled by the micropro-
cessor control panel to start/stop, and select compres-
sor speed. Power factor is 95% at part or full load.
The chiller microprocessor communicates with the
VSD logic board via a 3-wire RS-485 opto-coupled
data link. The VSD logic board runs the compressor
to the speed requested by the chiller microprocessor to
meet the load as shown in Figure 4 on page 18.
Quantech QWC4 chillers are designed for water or gly-
col cooling. All units are designed to be located in an
equipment room unless the unit was ordered specially
for outside applications.
The units are completely assembled with all intercon-
necting refrigerant piping and internal wiring, ready
for field installation.
Before delivery, the unit is:
• Pressure tested
• Evacuated
• Fully charged with refrigerant and oil in the re-
frigerant circuit
All exposed power wiring is routed through liquid-
tight, non-metallic conduit.
The QWC4 chiller combines the modern screw com-
pressor design with the latest Variable Speed Drive
(VSD) technology. The VSD enables the compressor
speed to match the system load, and provides soft starts
with no electrical inrush. The lack of heat buildup on
start-up also reduces required off time between starts
to two minutes.

QUANTECH
16
FORM QWC4-NM1 (221)
ISSUE DATE: 02/28/2021
SECTION 2 - PRODUCT DESCRIPTION
FIGURE 2 - QWC4 CHILLER MAJOR COMPONENTS (FRONT VIEW)
LD17364
1. Control Panel
2. Variable Speed Drive (VSD)
3. Oil Separator
4. Return Waterbox
5. Condenser
6. Condenser Sight Glass
7. Evaporator
8. Condenser Water Nozzle

QUANTECH 17
SECTION 2 - PRODUCT DESCRIPTION
FORM QWC4-NM1 (221)
ISSUE DATE: 02/28/2021
2
FIGURE 3 - QWC4 CHILLER MAJOR COMPONENTS (REAR VIEW)
LD17365
1. VSD
2. Compressor
3. Evaporator Sight Glass
4. Evaporator Water Nozzle
5. Liquid Level Sensor
6. Liquid Line
7. Condenser
8. Evaporator
2 1
4
8
5
6
7
3

QUANTECH
18
FORM QWC4-NM1 (221)
ISSUE DATE: 02/28/2021
SECTION 2 - PRODUCT DESCRIPTION
LD15158
3 Phase Power Line
AC/DC Rectier Power Driver
IGBT Gate Driver
VSD Logic Board
Inverter
PWM Signal
Signal From Main Control Panel
Rectier
Compressor 1
Compressor 2
Rectier Controller
SCR Trigger Board
(IGBT)
LD15028
INPUTS
Pressure Transducers
Temperature Sensors
Switches
Liquid Flow
High Pressure
Start/Stop
Level
Customer Supplied
Contacts
CONTROL
PANEL
(Chiller Control
Board)
Microprocessor
User Interface
Display and
Keypad
DISPLAY KEYPAD MOTOR
OUTPUTS
(Relay Output Board)
Solenoids
Alarm
Pump
Compressor Heater
Run Status
VSD
VSD Logic Board
SCR Trigger Board
Power Components
PWM (Speed Control)
COMMUNICATIONS
Building Automation
Printer Modem
FIGURE 4 - BASIC SYSTEM CONTROL AND VSD SYSTEM ARCHITECTURE

QUANTECH 19
SECTION 2 - PRODUCT DESCRIPTION
FORM QWC4-NM1 (221)
ISSUE DATE: 02/28/2021
2
SEMI-HERMETIC QUANTECH SCREW
COMPRESSORS
The direct-drive, semi-hermetic rotary screw com-
pressor incorporates advanced technology in a rugged
design. The continuous function, microprocessor con-
trolled VSD provides smooth capacity control from
100% down to 20% chiller capacity. State-of-the-art
screw compressor design and manufacturing ensures
optimal efficiencies at all chiller load points. With no
unloading steps or slide valves in the compressor, the
QWC4 variable speed driven compressor has 50%
fewer moving parts than fixed speed compressors
with slide valves. The QWC4 compressor is one of
the most efficient and reliable screw compressors in
the industry.
EVAPORATOR
The evaporator is a shell and tube, hybrid falling film
type heat exchanger. It contains a balance of flooded
and falling film technology to optimize efficiency, min-
imize refrigerant charge, and maintain reliable control.
A specifically designed distribution system provides
uniform refrigerant flow for optimum performance.
CONDENSER
The condenser is a shell and tube type, with a dis-
charge gas baffle to prevent direct high velocity im-
pingement on the tubes. The baffle is also used to
distribute the refrigerant gas flow properly for the
most efficient heat transfer. An integral sub-cooler is
located at the bottom of the condenser shell provid-
ing highly effective liquid refrigerant subcooling to
provide the highest cycle efficiency.
REFRIGERANT CIRCUIT
The QWC4 has one independent refrigerant circuit
per compressor. An electronic expansion valve (EEV),
controlled by the unit panel, accommodates varying
head and load conditions. The condenser shell is ca-
pable of storing the entire system refrigerant charge
during servicing. Optional service valves are available
to facilitate the removal of refrigerant. The sub-cooling
economizer (plate heat exchanger type), controlled by
the unit panel, meters some refrigerant gas to the com-
pressor to reduce energy consumption.
COMPLETE FACTORY PACKAGE
Each unit is shipped as a complete factory package,
completely assembled with all interconnecting refrig-
erant piping and internal wiring and ready for field
installation. Before shipment, each individual chiller
undergoes an extensive testing procedure, ensuring
workmanship is the highest quality and that the initial
start-up is trouble-free.
Before leaving the factory, each refrigerant circuit
is factory pressure tested, evacuated and then fully
charged with R-134a refrigerant and oil. An opera-
tional test is performed with water flowing through the
evaporator and condenser to ensure each circuit func-
tions correctly.
ELECTRICAL
All controls and motor starting equipment necessary
for unit operation are factory wired and function tested.
There are no surprises at start-up; the unit will start up
correctly the first time and every time. The standard
unit is equipped with circuit breaker for electrical con-
nections. The chillers come with a single point power
connection and are supplied with a factory mounted
and wired control transformer that powers all unit con-
trols from the main unit power supply. The transformer
uses scheduled line voltage on the primary side and
provides 115 V / 1 Ø on secondary. All exposed power
wiring is routed through liquid-tight, UV-stabilized,
non-metallic conduit.
VSD Power/Control Panel includes main power con-
nections, VSD contactors, current overloads, and fac-
tory wiring. All display and control features can be ac-
cessed through the keypad and control display access
door, eliminating the need to open the main cabinet
doors.
BUILDING AUTOMATION SYSTEM
CAPABILITIES
The E-Link Gateway provides an economical and ver-
satile connection between Quantech equipment and
open/standard protocols. It efficiently manages the
communication protocols currently used by Quantech
equipment, exposing the data in a consistent, orga-
nized, and defined fashion. A simple switch selection
allows configuration of the required equipment profile
and output protocol, which reduces equipment connec-
tivity startup time.

QUANTECH
20
FORM QWC4-NM1 (221)
ISSUE DATE: 02/28/2021
SECTION 2 - PRODUCT DESCRIPTION
MICROCOMPUTER CONTROL CENTER
The microcomputer control center, shown in Figure
5 on page 20,provides automatic control of chiller
operation including compressor start/stop and load/un-
load anti-recycle timers, condenser and chilled water
(CHW) pumps, unit alarm contacts and run signal con-
tacts. The microcomputer control center comes online
as soon as the main power switch is activated. Imme-
diately, the microcomputer control center will begin to
check all variables with a frequency ranging from 30
seconds to almost continuous monitoring.
The microprocessor controls the unit’s capacity by
matching the actual leaving chilled water temperature
(or condenser water temperature in heat pump applica-
tions), to the user-defined setpoint. Factors that may
cause the system’s actual leaving chilled water tem-
perature to fluctuate are:
• Changes in ambient temperature
• 
• Load
• Loop volume
The control system reacts to such changes by adjusting
the number of compressors that are on, and the loading
of each compressor to keep the leaving water tempera-
ture at the setpoint.
The control system logic monitors the rate at which the
leaving water temperature is approaching the setpoint
to ramp up or down compressor capacity as required.
The VSD allows the compressor capacity to match the
load.
Displayed data and programmable setpoints are de-
tailed in SECTION 6 - OPERATION in this manual.
LD19539
FIGURE 5 - CONTROL CENTER USER INTERFACE
LD16388a
Extreme Conditions – During extreme or unusual
conditions, the chiller control system will avoid shut-
down by varying capacity. By monitoring motor cur-
rent and suction and discharge pressures, the chiller
can maintain maximum available cooling output with-
out shutting down.
Unit safeties are provided for the chiller to perform au-
to-reset shutdown for the specific conditions detailed
in SECTION 6 - OPERATION in this manual.
OPTIONS
The following options are factory-mounted unless oth-
erwise noted.
Evaporator Options
Factory Insulation – Factory-applied thermal insula-
tion of the 3/4 in. (19 mm) flexible, closed-cell plastic
type is attached with vapor-proof cement to the follow-
ing components:
• Evaporator shell and tube sheets
• Suction connection
• Auxiliary tubing
Insulation can also be provided on the condenser to
meet specific application needs.