Quantech QTC40160 Owner's manual

Air-Cooled Screw Liquid Chillers
Installation, Operation, Maintenance New Release Form QTC4-NM2 (523)
R-134a or R-513A
525 kW to 1,934 kW
2 Compressor
50 Hz and 60 Hz
Model QTC4 Style B
Air-Cooled Screw Liquid Chillers with Variable Speed Drive
Frame Sizes 016 to 026
150 ton to 550 ton
035-29078-000
Issue Date:
May 12, 2023

Quantech
2
Form QTC4-NM2
Issue date: 05/12/2023
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.

Quantech 3
Form QTC4-NM2
Issue date: 05/12/2023
In complying with Johnson Controls policy for con-
tinuous product improvement, the information con-
tained in this document is subject to change without
notice. Johnson Controls 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
Johnson Controls Service office or accessing the John-
son Controls Knowledge Exchange website at https://
docs.johnsoncontrols.com/chillers/
It is the responsibility of rigging, lifting, and operat-
ing or service personnel to verify the applicability of
these documents to the equipment. If there is any ques-
tion regarding the applicability of these documents,
rigging, 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.
Changeability of this document

Quantech
4
Form QTC4-NM2
Issue date: 05/12/2023
Conditioned-based maintenance
Traditional chiller maintenance is based upon assumed
and generalized conditions. In lieu of the traditional
maintenance program, a Johnson Controls Quantech
Conditioned Based Maintenance (CBM) program can
be substituted. This CBM service plan is built around
the specific needs for the chiller, operating conditions,
and annualized impact realized by the chiller. Your lo-
cal Johnson Controls Branch can propose a customized
Planned Service Agreement that leverages real time
and historical data, delivering performance reporting,
corrective actions required and data enabled guidance
for optimal operation and lifecycle assurance. The pro-
gram will include fault detection diagnostics, operation
code statistics, performance based algorithms and ad-
vance rules based rationale delivered by the Johnson
Controls Connected Equipment Portal.
Working with chiller vessels which are designed to contain contents under pressure must only be
conducted under fully qualied technicians that have been certied in accordance with EPA Section
608 of the Clean Air Act requirements for the US or equivalently the Federal Halocarbon Regulations
and the Refrigerant Code of Practice for Canada. Refrigerant must be handled in accordance with all
governing regulations. Failure to meet this requirement may result in damage to equipment, release
of refrigerant into the environment, contamination of the operating space for the equipment, and
pose a risk of personal injury or death. It is the responsibility of any service technician or operator
to adhere to these requirements.
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 Johnson Controls published specications and must be performed only by a qualied
electrician. Johnson Controls will NOT be responsible for damage/problems resulting from improper
connections to the controls or application of improper control signals. Failure to follow this warn-
ing will void the manufacturer’s warranty and cause serious damage to property or personal injury.

Quantech 5
Form QTC4-NM2
Issue date: 05/12/2023
ASHRAE 90.1 Compliant
Products are produced at a
facility whose quality-
management systems are
ISO9001 certified.
LD23520a
UNIT NOMENCLATURE
Base Product Type
Q = Quantech
TC = Variable Speed Screw
4 = Air Cooled Design Series
Model Number
Configuration
S = Condenser Code
X = Evaporator Code
X = Compressor Code
X = Condenser Fan
& Sound Kit Code
QTC4 SXXX 46 AA
-
Level / Refrigerant
A = Refrigerant R-134a
B = Refrigerant R-513A
Voltage
17 = 200 / 3 / 60
28 = 230 / 3 / 60
40 = 380 / 3 / 60
42 = 400 / 3 / 60
46 = 460 / 3 / 60
50 = 380-415 / 3 / 50
58 = 575 / 3 / 60
210
The Control/VSD Cabinet contains lethal
high AC and DC voltages. Before per-
forming service inside the cabinet, remove
the AC supply feeding the chiller and
verify using a non-contact voltage sensor.
The DC voltage on the VSD DC Bus will
take 5 min to bleed o, after AC power
is removed. Always check the DC Bus
Voltage with a Voltmeter to ensure the
capacitor charge has bled o before work-
ing on the system.
NEVER short out the DC Bus to dis-
charge the lter capacitors.
NEVER place loose tools, debris, or any
objects inside the Control Panel/VSD
Cabinet.
NEVER allow the Control Panel VSD
Cabinet doors to remain open if there is a
potential for rain to enter the panel. Keep
doors closed and ensure that all latches
are engaged on each door unless the unit
is being serviced.
ALWAYS lockout the disconnect supply-
ing AC to the chiller.
The 1L Line Inductor will reach operating
temperatures of over 300°F (150°C). DO
NOT open panel doors during operation.
Ensure that the inductor is cool whenever
working near the inductor with power
OFF.
Unit nonmenclature

Quantech
6
Form QTC4-NM2
Issue date: 05/12/2023
Table of contents
Section 1 - General chiller information and safety............................................................................................. 11
Introduction..................................................................................................................................................... 11
Warranty ......................................................................................................................................................... 11
Quality assurance and safety .........................................................................................................................12
Fluorinated greenhouse gases.......................................................................................................................12
Responsibility for safety ................................................................................................................................. 12
About this manual...........................................................................................................................................12
Misuse of equipment ......................................................................................................................................12
Section 2 - Product description ...........................................................................................................................15
General system description............................................................................................................................15
Semi-hermetic Quantech twin-screw compressors ........................................................................................17
Evaporator......................................................................................................................................................17
Condenser......................................................................................................................................................17
Refrigerant circuit ...........................................................................................................................................17
Electrical.........................................................................................................................................................17
Building automation system capabilities.........................................................................................................18
Microcomputer control center.........................................................................................................................18
Accessories and options ................................................................................................................................19
Fan options.....................................................................................................................................................19
Condenser coils..............................................................................................................................................19
Section 3 - Rigging, handling, and storage.........................................................................................................23
Lifting weights.................................................................................................................................................23
Delivery and storage ......................................................................................................................................23
Inspecting the delivery....................................................................................................................................24
Moving the chiller ........................................................................................................................................... 24
Section 4 - Installation .........................................................................................................................................29
Location requirements....................................................................................................................................29
Outdoor installations.......................................................................................................................................29
Location clearances .......................................................................................................................................29
Vibration isolators...........................................................................................................................................31
Shipping braces..............................................................................................................................................31
Chilled liquid piping ........................................................................................................................................31
Evaporator pressure drop...............................................................................................................................32
Water treatment..............................................................................................................................................33
Pipework arrangement ...................................................................................................................................33
Minimum water volume .................................................................................................................................. 33
Leaving water temperature out of range ........................................................................................................33
Thermal storage .............................................................................................................................................34
Variable primary flow .....................................................................................................................................34
Connection types and sizes ...........................................................................................................................34
Evaporator connections..................................................................................................................................34
Refrigerant relief valve piping.........................................................................................................................36
Electrical connection ......................................................................................................................................36
Power wiring...................................................................................................................................................37
Power supply wiring ....................................................................................................................................... 37

Quantech 7
Form QTC4-NM2
Issue date: 05/12/2023
Table of contents, cont'd
115 VAC control supply transformer ...............................................................................................................37
Control wiring .................................................................................................................................................37
Volts free contacts ..........................................................................................................................................38
System inputs.................................................................................................................................................38
Power supply wiring ....................................................................................................................................... 39
Customer control wiring..................................................................................................................................41
Thermal dispersion flow switch connections ..................................................................................................42
Section 5 - Technical data.....................................................................................................................................65
Elastomeric isolator installation ......................................................................................................................88
Elastomeric isolator specifications ................................................................................................................. 89
One inch deflection isolator installation ..........................................................................................................90
One inch deflection spring isolator specifications...........................................................................................91
Two inch deflection, isolator installation and adjustment................................................................................92
Two inch deflection, restrained spring isolator specifications.........................................................................93
Section 6 - Commissioning ..................................................................................................................................95
Preparation.....................................................................................................................................................95
First time startup.............................................................................................................................................98
General operation...........................................................................................................................................98
Freeze damage protection .............................................................................................................................98
Section 7 - Operation ..........................................................................................................................................101
Operating controls ........................................................................................................................................101
Basic operating sequence ............................................................................................................................104
Microboard (331-03478-xxx) ........................................................................................................................104
SC-EQ communications card .......................................................................................................................107
Updating the program...................................................................................................................................107
Data logging .................................................................................................................................................108
Unit warning .................................................................................................................................................109
Unit safeties.................................................................................................................................................. 110
System safeties, faults ................................................................................................................................. 111
Section 8 - Micropanel ........................................................................................................................................ 117
Unit data key ................................................................................................................................................120
System data keys 1 through 4......................................................................................................................122
VSD data key ...............................................................................................................................................125
Operating hours/start counter key ................................................................................................................127
History key....................................................................................................................................................128
Setpoints key................................................................................................................................................135
Program key .................................................................................................................................................137
Unit setup mode ...........................................................................................................................................140
Options key ..................................................................................................................................................147
Date/time and schedule keys .......................................................................................................................150
Manual override key .....................................................................................................................................153
Print key .......................................................................................................................................................154
System switches key ....................................................................................................................................157

Quantech
8
Form QTC4-NM2
Issue date: 05/12/2023
Table of contents, cont'd
Section 9 - Maintenance......................................................................................................................................159
General requirements...................................................................................................................................159
Checking the system for leaks .....................................................................................................................160
Leak testing ..................................................................................................................................................160
Leak testing during operation .......................................................................................................................160
Vapor connection locations...........................................................................................................................160
System pressure test....................................................................................................................................161
Conducting the gas pressure hold test.........................................................................................................161
What to do next ............................................................................................................................................161
Conducting the soap visual gas leak test .....................................................................................................161
Conducting the optional trace gas leak test .................................................................................................162
System evacuation .......................................................................................................................................163
Vacuum dehydration.....................................................................................................................................163
Dehydration ..................................................................................................................................................164
Conducting the dehydration process............................................................................................................165
Conducting the final evacuation ...................................................................................................................166
Refrigerant charging.....................................................................................................................................166
Removing the refrigerant charge for service ................................................................................................169
Checking and trimming the refrigerant charge .............................................................................................170
Definitions.....................................................................................................................................................170
Checking the refrigerant charge during unit shutdown.................................................................................170
Microchannel coil cleaning ...........................................................................................................................171
Cleaning procedure required for standard and environment guard microchannel coils ...............................171
Cleaning procedure for environment guard premium microchannel coils ....................................................172
Steps to touch-up small sections of the finned coil surface:.........................................................................172
Steps to touch-up end, dead tubes or condenser coil headers: ...................................................................173
Materials required:........................................................................................................................................173
Chilled liquid system maintenance ...............................................................................................................173
Maintenance requirements for QTC4 chillers...............................................................................................175
R-134a conversion table ..............................................................................................................................179
R-513A conversion table, temperature to pressure......................................................................................180
Chilled liquid and suction temperature sensor input voltage .......................................................................181
Section 10 - Decommissioning, dismantling, and disposal ............................................................................ 185
General.........................................................................................................................................................185
Temperature .................................................................................................................................................186

Quantech 9
Form QTC4-NM2
Issue date: 05/12/2023
List of figures
Figure 1 - QTC4 air-cooled screw liquid chiller with variable speed drive ..............................................................15
Figure 2 - Chiller control system.............................................................................................................................16
Figure 3 - View of Quantech control center user interface .....................................................................................19
Figure 4 - Lifting lugs ..............................................................................................................................................24
Figure 5 - Lifting using lugs.....................................................................................................................................24
Figure 6 - Power panel. 1 to 4 ................................................................................................................................25
Figure 7 - Power panel, 1 to 5 ................................................................................................................................26
Figure 8 - Power panel, 1 to 6 ................................................................................................................................27
Figure 9 - Power panel, 1 to 8 ................................................................................................................................28
Figure 10 - Acceptable minimum clearances around and between units ............................................................... 30
Figure 11 - Pipework arrangement .........................................................................................................................33
Figure 12 - Leaving water temperature out of range suggested layout .................................................................. 33
Figure 13 - Suggested layout for applications with a ow rate less than the evaporator minimum
allowable ow rate................................................................................................................................34
Figure 14 - Suggested layout for applications with a ow rate greater than the evaporator maximum
allowable ow rate................................................................................................................................34
Figure 15 - Grooved nozzle ....................................................................................................................................34
Figure 16 - Flange for GB vessels..........................................................................................................................36
Figure 17 - Flange attachment................................................................................................................................36
Figure 18 - Single point power wiring .....................................................................................................................39
Figure 19 - Dual point power wiring........................................................................................................................40
Figure 20 - Customer control connections .............................................................................................................41
Figure 21 - Thermal dispersion ow switch connections ........................................................................................42
Figure 22 - Reserved customer wiring entry ..........................................................................................................43
Figure 23 - Water box heater wiring box.................................................................................................................43
Figure 24 - Standard two-pass, right side inlet/outlet evaporator connections.......................................................70
Figure 25 - Optional two-pass left side inlet/outlet connections..............................................................................72
Figure 26 - Standard two-pass left side inlet/outlet connections ............................................................................74
Figure 27 - Optional three-pass inlet/outlet connections ........................................................................................75
Figure 28 - QTC4 dimensions.................................................................................................................................77
Figure 29 - Isolator selection and mounting locations ............................................................................................78
Figure 30 - Isolator selection and mounting locations ............................................................................................79
Figure 31 - Isolator selection and mounting locations ............................................................................................80
Figure 32 - Isolator selection and mounting locations ............................................................................................81
Figure 33 - Isolator selection and mounting locations ............................................................................................82
Figure 34 - Isolator selection and mounting locations ............................................................................................83
Figure 35 - Isolator selection and mounting locations ............................................................................................84
Figure 36 - Isolator selection and mounting locations ............................................................................................85
Figure 37 - Isolator selection and mounting locations ............................................................................................86
Figure 38 - Isolator selection and mounting locations ............................................................................................87
Figure 39 - Elastomeric isolator..............................................................................................................................88
Figure 40 - Elastomeric isolator specications .......................................................................................................89
Figure 41 - One inch deection isolator..................................................................................................................90
Figure 42 - One inch deection isolator specications ...........................................................................................91
Figure 43 - Two inch deection isolator ..................................................................................................................92
Figure 44 - Two inch deection isolator specications............................................................................................ 93
Figure 45 - LED indicator buttons...........................................................................................................................96
Figure 46 - Flow switch set.....................................................................................................................................97
Figure 47 - Flow below the representation range ................................................................................................... 97
Figure 48 - Flow exceeds the representation range ............................................................................................... 97
Figure 49 - Keyboard and display.........................................................................................................................101
Figure 50 - New 331-03478-xxx microboard ........................................................................................................106
Figure 51 - Micropanel.......................................................................................................................................... 117
Figure 52 - Unit data key ......................................................................................................................................120
Figure 53 - System data keys 1 through 4............................................................................................................122
Figure 54 - VSD data key .....................................................................................................................................125

Quantech
10
Form QTC4-NM2
Issue date: 05/12/2023
List of tables
Table 1 - Unit lifting point locations .........................................................................................................................25
Table 2 - Minimum evaporator tube removal clearance ..........................................................................................30
Table 3 - Evaporator connections dimensions ........................................................................................................ 35
Table 4 - Standard 2 hp condenser fans, single point electrical lug data................................................................45
Table 5 - Standard 2 hp condenser fans, dual point electrical lug data ..................................................................53
Table 6 - EBM condenser fans, single point electrical lug data............................................................................... 55
Table 7 - EBM condenser fans, dual point electrical lug data ................................................................................. 63
Table 8 - Physical data, microchannel coil ..............................................................................................................66
Table 9 - Standard two-pass, right side inlet/outlet evaporator connections...........................................................70
Table 10 - Optional two-pass left side inlet/outlet connections ...............................................................................72
Table 11 - Standard two-pass left side inlet/outlet connections ..............................................................................74
Table 12 - Optional three-pass inlet/outlet connections .......................................................................................... 75
Table 13 - Isolator selection and mounting locations .............................................................................................. 78
Table 14 - Elastomeric dimensions .........................................................................................................................89
Table 15 - Elastomeric weights ...............................................................................................................................89
Table 16 - One inch deflection isolator dimensions.................................................................................................91
Table 17 - One inch deflection isolator weights.......................................................................................................91
Table 18 - Two inch deflection isolator weights.......................................................................................................93
Table 19 - QTC4 freeze damage protection requirements......................................................................................99
Table 20 - Flash card update error XXXXX...........................................................................................................108
Table 21 - Low differential oil pressure cutout....................................................................................................... 113
Table 22 - Discharge pressure load limiting/unloading ......................................................................................... 114
Table 23 - Suction pressure load limiting/unloading.............................................................................................. 114
Table 24 - Start inhibit sensor thresholds.............................................................................................................. 115
Table 25 - System sensor minimum and maximum outputs .................................................................................124
Table 26 - Compressor overload settings .............................................................................................................126
Table 27 - Setpoint limits.......................................................................................................................................136
Table 28 - Programmable operating parameters ..................................................................................................139
Table 29 - Setup mode programmable values ...................................................................................................... 140
Table 30 - Printout types .......................................................................................................................................154
Table 31 - System pressures ................................................................................................................................164
Table 32 - R-134a pressure to saturated temperature conversion........................................................................ 167
Table 33 - R-513A pressure to saturated temperature conversion .......................................................................168
Table 34 - Part numbers........................................................................................................................................173
Table 35 - Troubleshooting guide..........................................................................................................................176
Table 36 - R-134a pressure to saturated temperature conversion........................................................................ 179
Table 37 - R-513A refrigerant temperature to pressure ........................................................................................180
Table 38 - Temperature input voltage sensor, measured signal to shield at the sensor .......................................181
Table 39 - Outside air temperature sensor input voltage, measured signal to shield at the sensor...................... 182
Table 40 - Pressure transducer output voltage, measured signal to return at the transducer ..............................183
Table 41 - Motor temperature sensor resistance ..................................................................................................184
Table 42 - SI metric conversion.............................................................................................................................186
Figure 55 - Operating hours/Start counter key .....................................................................................................127
Figure 56 - History key..........................................................................................................................................128
Figure 57 - Setpoints key......................................................................................................................................135
Figure 58 - Program key.......................................................................................................................................137
Figure 59 - Options key ........................................................................................................................................147
Figure 60 - Date/time and schedule key...............................................................................................................150
Figure 61 - Manual override key...........................................................................................................................153
Figure 62 - Print key .............................................................................................................................................154
Figure 63 - System switches key..........................................................................................................................157
Figure 64 - Service connections ...........................................................................................................................160
Figure 65 - Leak test hold times ...........................................................................................................................161
Figure 66 - Evacuation of the chiller operation .....................................................................................................163
Figure 67 - Saturation curve .................................................................................................................................165
List of Figures, cont'd

Quantech 11
Form QTC4-NM2
Issue date: 05/12/2023
1
Section 1 - General chiller information and safety
Introduction
Quantech QTC4 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.
Ensure only a professional rigger does the rigging and
lifting, in accordance with a written rigging and lifting
plan. The most appropriate rigging and lifting method
depends on job specific factors, such as the rigging
equipment available and site needs. As a result, a pro-
fessional rigger must determine the rigging and lifting
method to be used, and it is beyond the scope of this
manual to specify rigging and lifting details.
This manual contains all the information required for
correct installation and commissioning of the unit, to-
gether with operating and maintenance instructions.
The manual must be read thoroughly before attempting
to operate or service the unit.
All procedures detailed in the manual, including in-
stallation, commissioning and maintenance tasks must
only be performed by suitably trained and qualified
personnel.
The manufacturer will not be liable for any injury or
damage caused by incorrect installation, commission-
ing, operation or maintenance resulting from a failure
to follow the procedures and instructions detailed in
the manual.
Warranty
Quantech warrants QTC4 chillers in accordance with
the Limited Warranty Engineered Systems Equipment
procedure. Refer to Form 50.05-NM2.
Quantech warrants all equipment and materials against
defects in workmanship and materials for a period of
eighteen months from date of shipment or 12 months
from date of startup, whichever comes first, unless la-
bor 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 sub-
assembly, which has failed due to poor quality or man-
ufacturing errors. All claims must be supported by evi-
dence that the failure has occurred within the warranty
period, and that the unit has been operated within the
designed parameters specified.
All warranty claims must specify the unit model,
serial number, order number and run hours/starts. Mod-
el and serial number information is printed on the unit
identification plate.
The unit warranty is void if any modification to the
unit is carried out without prior written approval from
Quantech. For warranty purposes, the following condi-
tions must be satisfied:
• The initial start of the unit must be carried out by
trained personnel from an authorized Quantech
Service Center. See Section 6 - Commissioning,
for more information.
• Only genuine Quantech approved spare parts,
oils, coolants, and refrigerants must be used.
• All the scheduled maintenance operations detailed


See Section 9 - Maintenance, for more informa-
tion.
• Failure to satisfy any of these conditions au-
tomatically voids the warranty. Refer to
Form 50.05-NM2 for complete details.
The rigger must locate the center of
gravity through trial lifts to account
for possible variations in unit congura-
tions. Contact your nearest Quantech
sales representative for weight data. See
Section 3 - Rigging, handling, and storage
on page 23 for more details.

Quantech
12
Section 1 - General chiller information and safety Form QTC4-NM2
Issue date: 05/12/2023
Quality assurance and safety
QTC4 chillers are designed within EN ISO 9001 and
built within an EN ISO 9002 accredited manufacturing
organization.
Units conform with the following European Directives:
• Machinery Directive (2006/42/EC)
• EMC Directive (2004/108/EC)
• Pressure Equipment Directive (2014/68/EU)
• Low Voltage Directive (2006/95/EC)
• Safety Code for Mechanical Refrigeration
(EN378-2(2016))
CE/PED marked units conform to the following
standards:
• Machinery Directive (2006/42/EC).
• EMC Directive (2004/108/EC).
• Pressure Equipment Directive (2014/68/EU).
• Low Voltage Directive (2006/95/EC).
• Safety Code for Mechanical Refrigeration
(EN378-2(2016)).
ETL/ASME marked units conform to the following
standards:
• ANSI/ASHRAE 15: Safety Code for
Mechanical Refrigeration.
• ANSI/ASHRAE 34: Number Designation and

• ANSI/NFPA 70: National Electrical Code (NEC).
• ASME Boiler and Pressure Vessel Code, Section
VIII, Division 1.
GB marked units conform to the following standards:
• GB5226.1 Safety of machinery: Electrical equip-
ment of machines, Part 1: General requirements.
• GB25131 Safety requirements for water chiller
(heat pump) using the vapor compression cycle.
• GB18430.1 Water chilling (heat pump) package
using the vapor compression cycle Part 1: Water
chilling (heat pump) package for industrial and
commercial and similar applications.
• NB/T 47012 Pressure vessels for refrigerant
equipment.
Fluorinated greenhouse gases
• 
gases covered by the Kyoto Protocol.
• The global warming potential of the refrigerant
R-134a is 1300. The global warming potential for
R-513A is 546. Both use the integrated time of
100 years based on IPCC 5th report 2013, Table
8.A.1.
• The refrigerant quantity is as stated in Table 8 on
page 66 of this document.
• -
ment may not be vented to the atmosphere.
• This equipment must only be serviced by

Responsibility for safety
Every care has been taken in the design and manufac-
ture of the unit to ensure compliance with the safety
requirements listed above. However, the individual
rigging, lifting, maintaining, operating, or working on
any machinery is primarily responsible for:
• Personal safety, safety of other personnel, and the
machinery.
• Correct use of the machinery in accordance with
the procedures detailed in the manual.
About this manual
The contents of this manual include suggested best
working practices and procedures. These are issued for
guidance only, and they do not take precedence over
the above stated individual responsibility or local safe-
ty regulations.
This manual and any other document supplied with
the unit are the property of Quantech which reserves
all rights. They may not be reproduced, in whole or in
part, without written authorization from an authorized
Quantech sales representative.
Misuse of equipment
Suitability for application
The unit is intended for cooling water or glycol solu-
tions and is not suitable for purposes other than those
specified in these instructions. Any use of the equip-
ment other than its intended use, or operation of the
equipment contrary to the relevant procedures may re-
sult in injury to the operator, or damage to the equip-
ment.

Section 1 - General chiller information and safety
Quantech 13
Form QTC4-NM2
Issue date: 05/12/2023
1
The unit must not be operated outside the design pa-
rameters specified in this manual.
Structural support
Structural support of the unit must be provided as in-
dicated in these instructions. Failure to provide correct
support may result in injury to the operator, or damage
to the equipment 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.
It is important to ensure access to the unit is restricted
to suitably qualified persons who are familiar with the
potential hazards and precautions necessary for safe
operation and maintenance of equipment containing
high temperatures, pressures and voltages.
Pressure systems
The unit contains refrigerant vapor and liquid under pres-
sure, the release of which can be a danger and cause injury.
The user must ensure that care is taken during installation,
operation and maintenance to avoid damage to the pres-
sure system. No attempt must 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. Do not attempt installa-
tion or maintenance work on the electrical equipment
without first switching the power off, isolating, and
locking-off the power supply. Servicing and mainte-
nance on live equipment must not be attempted. Do not
attempt to gain access to the control panel or electrical
enclosures during normal operation of the unit.
Caution
This equipment (Class A, Group 1) is designed and
manufactured for use in an industrial environment, in
accordance with EN 61000-6-2:2005 and EN 61000-6
4:2007 (with EN 55011:2007 limits). It is not intended
to be used on a low-voltage public network which sup-
plies domestic premises. Radio frequency interference
may occur if it is used on a low voltage public network.
This equipment equipped with VSD, may generate
conducted and radiated disturbances, which may inter-
fere with or damage susceptible connected apparatus.
Follow generally accepted engineering standards
and practices to ensure trouble-free and EMC com-
pliant electrical installation. Installations must be
supervised or completed by a competent person in
accordance with EN 13313.
Special considerations depending on the application:
• Industry standard grounding or earthing
practices for the equipment and installation.
• Use of shielded or special cables (power and/or
control).
• Use of metallic conduit and/or cable trays for
power and control cables connected to equipment.
• Cable segregation. In order to avoid the risk of
crosstalk or cross interference to signal cables,
the power cables must be segregated from signal
cables.
• Dedicated isolation transformer.
• 
It is the responsibility of a designated System Integra-
tor to take correct steps assuring the Electromagnetic
Compatibility of both equipment and installation as a
system.
Rotating parts
Fan guards must be fitted at all times and not removed
unless the power supply has been isolated. If ductwork
is to be fitted, requiring the wire fan guards to be re-
moved, alternative safety measures must be taken to
protect against the risk of injury from rotating fans.
Sharp edges
The fins on the air-cooled condenser coils have sharp
metal edges. Reasonable care must be taken when
working in contact with the coils to avoid the risk of
minor abrasions and lacerations. The use of gloves is
recommended.
Frame rails, brakes, and other components may also
have sharp edges. Reasonable care must be taken when
working in contact with any components to avoid risk
of minor abrasions and lacerations.

Quantech
14
Section 1 - General chiller information and safety Form QTC4-NM2
Issue date: 05/12/2023
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 of gloves and safety glass-
es is, however, recommended when working on the
unit. The buildup of refrigerant vapor, from a leak for
example, does pose a risk of asphyxiation in confined
or enclosed spaces, so good ventilation is essential.
Use only the refrigerant specifically designated for the
unit. Any other type of refrigerant may cause damage
to the equipment and voids the warranty.
High temperature and pressure cleaning
Do not use high temperature and pressure cleaning
methods, for example steam cleaning, on any part of
the pressure system as this may cause operation of the
pressure relief devices. Also avoid using detergents
and solvents, which may cause corrosion.
Emergency shutdown
In case of emergency, the control panel is fitted with an
incoming supply circuit breaker with a red and yellow
handle which can be used as the emergency stop de-
vice. When operated it removes the electrical supply to
the inverter, fans, and control circuit which shuts down
the unit.
MSDS information
Manufacturer Safety Data Sheets (MSDS) information
can be obtained by calling [phone] in the US or
by emailing [email protected]. Provide the product
name, manufacturer, part number, and the specific lan-
guage required. For additional safety information, refer
to https://my.jci.com/sites/BE/NASafety.
Generator Operation
The variable speed drive can operate on a generator,
provided that the generator's output voltage can be
maintained within the voltage specifications for the
drive. When switching from utility power to generator
power, a minimum of a 10 s delay must be provided.
This same delay is required when switching power
back from generator power to utility power, unless a
synchronized transfer system is used.
Safety labels
White symbol on blue background.
For safe operation, read the Instructions
first.
Black symbol on yellow background.
Warning: This machine may start auto-
matically without prior warning.
Black symbol on yellow background.
Warning: Hot surface.
Black symbol on yellow background.
Warning: Safety relief valve may dis-
charge gas or liquid without prior warning.
Black symbol on yellow background.
Warning: Isolate all electrical sources of
supply before opening or removing the
cover, as lethal voltages may exist.
Black symbol on yellow background.
General attention symbol.
Black symbol on yellow background.
Warning: On isolating the supply, it may
take up to 300 s for the capacitor voltage
to fall below 50 V.

Quantech 15
Form QTC4-NM2
Issue date: 05/12/2023
2
Section 2 - Product description
Quantech QTC4 chillers are designed for water or gly-
col cooling. All units are designed to be located outside
on the roof of a building or at ground level.
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,
and fully charged with refrigerant and oil in each of the
two independent refrigerant circuits. After assembly,
an operational test is performed with water flowing
through the evaporator to ensure that each refrigerant
circuit operates correctly.
The unit structure is manufactured from heavy gauge,
galvanized steel. Many external structural parts are
coated with baked-on enamel powder Champagne
paint color (RAL 7006, Munsel No. 9.8YR4.36/1.2).
All exposed power wiring is routed through liquid-
tight, non-metallic conduit.
General system description
The QTC4 Chiller combines the best of modern screw
compressor design with the latest technology in vari-
able speed drives (VSD). The result is superior control
and efficiency in real world conditions. The VSD can
slow the speed of the compressor to match the load on
the system resulting in precise chilled liquid control,
minimized sound, maximum energy efficiency, and re-
duced cost of ownership. The VSD also provides soft
starts with no electrical inrush. The lack of heat build-
up on start also enables required off time between starts
to be reduced to a period of 2 min.
The QTC4 Air-Cooled Screw Chiller uses many com-
ponents, which are the same or nearly the same as a
standard screw chiller of a similar size. This includes
modular frame rails, condenser, fans, compressors, and
evaporator.
The chiller consists of two screw compressors in a
corresponding number of separate refrigerant circuits,
a series counter flow type hybrid falling film evapo-
rator, an air-cooled condenser, brazed plate heat ex-
changer economizer, feed valves, oil separators, and
compressor mufflers.
Figure 1 - QTC4 air-cooled screw liquid chiller with variable speed drive
LD15045

Quantech
16
Section 2 - Product description Form QTC4-NM2
Issue date: 05/12/2023
Oil separators use no moving parts. Oil cooling is ac-
complished by refrigerant leaving the eductor flashing
in the suction line which cools the oil, motor, and com-
pressor.
An integral liquid cooled, transistorized, PWM, VSD
is controlled by the chiller microprocessor control
panel to start/stop, select compressors to run, and select
compressor speed. Displacement Power Factor is 0. 95
at part or full load.
The chiller microprocessor communicates with the
VSD Logic Board using a three-wire RS-485 opto
coupled data link. The VSD Logic Board runs the
number of compressors required to meet the load and
the compressors to the speed requested by the chiller
microprocessor.
The basic system control and VSD system
architecture is shown in Figure 2 on page 16.
Figure 2 - Chiller control system
LD15028
Inputs
Pressure transducers
Temperature sensors
Switches
Liquid ow
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
Contactors
Alarm
Pump
Compressor heater
Run status
Evaporator heater
VSD
VSD logic board
SCR trigger board
Power components
PWM (speed control)
Communications
Building automation
printer modem
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)

Section 2 - Product description
Quantech 17
Form QTC4-NM2
Issue date: 05/12/2023
2
Semi-hermetic Quantech twin-screw
compressors
Compressors are direct drive, semi-hermetic and
rotary twin-screw type, and include the following fea-
tures:
• 
• 
• IP55 terminal board
• Precision machined cast iron housing
•       -
cessible hermetic compressor motor
• 
• Inherent internal thermal overload protection
• External current overload on all three phases
Continuous function, microprocessor controlled,
variable speed drive (VSD) must provide valve-less,
smooth capacity control from 100% down to 10% of
chiller capacity.
In addition, elimination of the slide valve and associ-
ated unloading components results in a 50% reduction
in compressor moving parts.
Evaporator
The evaporator is a two-circuit, series counterflow
shell and tube, hybrid falling film type heat exchanger.
It contains a balance of flooded and falling film tech-
nology to optimize efficiency, minimize refrigerant
charge, and maintain reliable control. A specifically
designed distribution system provides uniform refrig-
erant flow for optimum performance.
Condenser
The QTC4 Style B introduces next-gen 4G microchan-
nel coils to the Quantech screw compressor chiller line.
This design allows for bigger flow channels, reducing
refrigerant pressure drop by three to four times and
improving condenser performance. The microchan-
nel maximizes condenser heat transfer, resulting in a
smaller footprint, and reduces refrigerant charge by as
much as 50%.
Each condenser coil is a single piece all aluminum
construction including headers, tubes and fins to avoid
galvanic corrosion due to dissimilar metals. Coils and
headers are brazed as one piece. Integral subcooling
is included. The design working pressure is 375 psig
(25.9 barg).
Multiple, standard low sound, high efficiency, variable
speed drive motor driven fans move air through the
coils. They are dynamically and statically balanced,
direct drive with corrosion-resistant glass fiber rein-
forced composite blades molded into low-noise, full
airfoil cross sections, providing vertical air discharge
from extended orifices for efficiency and low sound.
Fan motors are totally enclosed air-over (TEAO),
squirrel-cage type and current protected. The direct
drive motors feature double-sealed and permanently
lubricated ball bearings, cutting down on mainte-
nance cost over the life of the unit. The chiller is also
equipped with the option of variable speed electroni-
cally commutated (EC) motors to provide extra airflow
across coils with lower power consumption, resulting
in higher efficiencies.
Refrigerant circuit
An independent refrigerant circuit is provided for each
compressor. Each circuit uses copper refrigerant pipe
formed on computer controlled bending machines to
reduce the number of brazed joints resulting in a reli-
able and leak resistant system.
• Discharge lines are provided with a manual com-
Accessories and
options on page 19, for service isolation valve.
• The external oil separators, with no moving parts
and designed for minimum oil carryover, are
mounted in the discharge line of the compressor.
• Liquid line components includes the following
components:
• High absorption removable core filter-drier
• Sight glasses with moisture indicators
• Manual shut-off valve with charging port
• Orifice and electronic expansion valve.
• A brazed plate heat exchanger is located in each

Electrical
Quantech has years of experience designing variable-
speed drives specifically for chiller applications. The
result is an extremely reliable air-cooled chiller system
that offers industry leading efficiency at real world op-
erating conditions, valve-less compressor loading/un-
loading, excellent capacity control, high power factor
and soft start.

Quantech
18
Section 2 - Product description Form QTC4-NM2
Issue date: 05/12/2023
Incoming single-point power is standard, using a lock-
able circuit breaker, 115 VAC control transformer,
VSD, fan contactors, ON/OFF unit switch, microcom-
puter keypad and display, Chiller Control and VSD
Logic boards, and relay boards.
Standard design includes IP55 rating, powder painted
steel cabinet with hinged, latched, and gasket sealed
outer doors equipped with wind struts for safer servic-
ing. The panel includes a control display access door so
that display and control features can be accessed with-
out opening main cabinet doors. All exposed power
wiring is routed through liquid-tight, UV-stabilized,
non-metallic conduit.
Building automation system
capabilities
SC-EQUIP Gateway provides an economical and ver-
satile connection between Quantech equipment and
open/standard protocols. It efficiently manages the
communication protocols currently used by Quan-
tech equipment, exposing the data in a consistent, or-
ganized, and defined fashion. SC-EQUIP Gateway is
available as a field-installed option on QTC4. A simple
switch selection allows configuration of the required
equipment profile and output protocol, which reduces
equipment connectivity startup time.
Microcomputer control center
The microcomputer control center provides automatic
control ofchiller operation, including compressor start/
stop and load/unload anti-recycle timers, condenser
fans, evaporator pump, evaporator heater, unit alarm
contacts and run signal contacts. The microcomputer
control center comes online as soon as the main power
switch on the unit is switched on; immediately, the
microcomputer control center will begin to check all
variables with a frequency ranging from 30 s to almost
continuous monitoring. See Figure 3 on page 19.
The microprocessor controls the unit’s capacity by
matching the actual leaving chilled water tempera-
ture (LCWT) to the user-defined setpoint. Factors that
may cause the system’s actual LCWT to fluctuate are
changes in ambient temperature, loop flow rate, load,
and loop volume. The control system reacts to such
changes by adjusting the number of compressors that
are on and the loading of each compressor in order to
keep the LCWT at the setpoint.
The control system logic monitors the rate at which the
LCWT is approaching the setpoint to ramp up or down
compressor capacity as required. Variable frequency
drive allows the compressor capacity to match the load.
Display data
• Leaving chilled liquid temperature
• Returning liquid temperature
• Ambient temperature
• Lead system
• Compressor capacity, percentage of full load amps
• VSD output frequency/compressor speed
• Compressor run hours
• Compressor number of starts
• Oil pressure and temperature, for each
compressor
• Evaporator pump status
• Evaporator heater status
• History data for last twenty normal shutdowns
• History data for last ten shutdown faults
• System 1 and system 2 operation data
Programmable setpoints
• 
• Chilled liquid, water or glycol
• Local or remote control
• Units of measure, imperial or SI
• System lead or lag
• Remote temperature reset
• Remote current limit
• Leaving chilled liquid temperature setpoint and
range

Section 2 - Product description
Quantech 19
Form QTC4-NM2
Issue date: 05/12/2023
2
Figure 3 - View of Quantech control center user
interface
Quantech systems or another vendor’s systems can in-
corporate these setpoints and data outputs to give the
customer a complete understanding of how the system
is running through a Building Automation System.
Extreme Conditions – During extreme or unusual
conditions (that is, blocked condenser coils, ambient
above scheduled maximum, and so on) the chiller con-
trol system avoids shutdown by varying capacity. By
monitoring motor current and suction and discharge
pressures, the chiller can maintain maximum available
cooling output without shutting down.
Unit Safeties are provided for the chiller to perform
auto-reset shut down for the following conditions:
• Ambient temperature above or below allowable
range
• Out of range leaving chilled liquid temperature
• Under voltage
• Flow switch operation
Accessories and options
All options factory mounted unless otherwise noted.
Sound attenuation
Low Noise Kits – The standard chiller configuration is
equipped with low sound fans and acoustic treatments
on the refrigerant lines and compressors. There are
several sound attenuation options available to further
reduce sound at its source thereby meeting local sound
level regulations.
SilentNight™ – Due to time of day based sound regu-
lations in some locations it may be desirable to force
the chiller to a lower sound level on demand. The Si-
lentNight™ control option provides a control input to
limit sound output of the chiller based on time of day.
This feature is programmable at the chiller panel or can
be controlled remotely using a signal (4 mA to 20 mA
or 0 VDC to 10 VDC) from a BAS system.
Fan options
Low Sound Fans – The chiller is equipped with spe-
cially designed fans and motors to provide lower sound
levels yet retain appropriate airflow. The result is re-
duced fan generated sound with minimal effect on the
chiller capacity or efficiency. Low sound fans are also
available with variable speed control.
HighAirflow EC Fans – The chiller is also equipped with
the option of condenser fan assembly utilizing variable
speed electronically commutated (EC) motors to provide
extra airflow across coils with lower power consump-
tion, resulting in higher efficiencies. In some chiller con-
figurations, this option can provide an increase in chiller
capacity at high ambient. Contact your local Quantech
representative for more information.
Condenser coils
QTC4 offers next-gen 4G microchannel coils which
allow for bigger flow channels, reducing refrigerant
pressure drop by three to four times and improved con-
denser performance. The design working pressure of
the coils is 375 psig (25.8 barg).
Condenser coil protection
The aluminum alloys used in the QTC4 micro-chan-
nel condenser have been carefully selected and tested
for high corrosion resistance. However, all metals can
corrode in harsh conditions. Consider protecting coils
from corrosive environments such as coastal, marine,
urban and industrial.

Quantech
20
Section 2 - Product description Form QTC4-NM2
Issue date: 05/12/2023
Post-Coated Epoxy Dipped Condenser – Micro-
channel condenser coils applied with electro-deposited
and baked flexible epoxy coating that is finished with a
polyurethane UV resistant top-coat suitable for highly
corrosive applications.
Protective chiller panels
Wire Panels – UV stabilized black polyvinyl chloride
coated, heavy gauge, welded wire mesh guards mounted
on the exterior of the full unit. Protects condenser coil
faces and prevents unauthorized access to refrigerant
components (compressors, pipes, evaporator, and so on),
yet provides free air flow. This can cut installation cost
by eliminating the need for separate, expensive fencing.
Louvered Panels – Louvered panels, painted the same
color as the unit, enclose the unit to visually screen
and protect the coils as well as preventing unauthor-
ized access to internal components. Also available as a
condenser-only option.
Louvered/Wire Panels Combination – Louvered pan-
els, painted the same color as the unit, are mounted on
external condenser coil faces. Heavy gauge, welded
wire-mesh panels, coated to resist corrosion, are mounted
around base of machine to restrict unauthorized access.
End Hail Guard – Louvered panels, painted with the
same color as the unit, are installed on the rear of the
unit (opposite end of the control panel) to protect the
exposed condenser from flying debris or hail.
Evaporator options
38 mm insulation – Double thickness insulation
provided.
Flange Kit – Provides contractor with the couplings
best suited to tie into the chilled water piping. All
flanges are PN10.
Connection Location – The standard unit configu-
ration is available with fluid inlet connections at the
right-side or left-side (for two-pass configuration) of
the evaporator. Option available for front fluid inlet
(control panel end) and back fluid connections for
three-pass evaporators. Three-pass evaporators have
inlet and outlet connections on the opposite ends.
Water Box Heater – Unless an appropriate freeze pro-
tection fluid is used in the chilled fluid circuit, optional
water box heaters are required if the chiller is exposed
to environments that reach ambient temperatures be-
low 0 17.8      
operated along with other required freeze protection
protocols, they assist in protecting the evaporator from
freeze damage in ambient temperatures down to -20
(-29    120 V/60 Hz
or 230 V/50 Hz single phase power supply is required
to provide power to the water box heaters. In order to
control the operation of the water box heaters, continu-
ous power must be provided to the chiller control pan-
el. See the Commissioning section for the requirements
for protection against freeze damage.
Controls Options
High Ambient Operation – This provides special
control logic coupled with high airflow fans to permit
high ambient up to 55°C (131°F) operation. Fans are
airfoil type blades with high power motors. This option
may also allow for increased machine capacity, allow-
ing the selection of a smaller chassis to meet specific
capacity requirements.
Building Automation System Interface (Tempera-
ture) – Factory installed option to accept a 4 mA to 20
mA or a 0 VDC to 10 VDC input to allow remote reset
of the Leaving Chilled Liquid Temperature Setpoint.
The setpoint can be positively offset upwards up to
22.2°C (40°F). This option is useful for ice storage or
process applications or for periods where higher chilled
liquid temperatures are adequate for low loads. Avail-
able alone or in combination with BAS Load Limit.
Building Automation System Interface (Load
Limit) – Factory installed option to accept a 4 mA to
20 mA or a 0 VDC to 10 VDC input to allow remote
reset of the Load Limit Setpoint. The setpoint can limit
system demand from 30% to 100%. Available alone or
in combination with BAS Temperature Reset.
SC-EQUIP Gateway – The optional SC-EQUIP Gate-
way provides communication between the equipment
and Building Automation Systems, including BACnet
(MS/TP), Modbus, LON, and N2.