Quantech QWC3 Manual de usuario
MODEL QWC3
WATER-COOLED SCROLL LIQUID CHILLER
50 – 200 TONS
60Hz
R-410a
FORM QWC3-EG1 (217)
QUANTECH
FORM QWC3-EG1 (217)
2
Nomenclature
Approvals
• ASME Boiler and Pressure Vessel Code –Section Vlll Division 1
• AHRI Standard 550/590 and 551/591
• c/U.L. – Underwriters Laboratory
• ASHRAE 15 – Safety Code for Mechanical Refrigeration
• ASHRAE Guideline 3 – Reducing Emission of Halogenated Refrigerants in Refrigeration and Air Conditioning
Equipment and Systems
• N.E.C. – National Electrical Code
• OSHA – Occupational Safety and Health Act
QWC3 50T S E 46 X
QWC3 = QUANTECH CHILLER WATER COOLED SCROLL
DESIGN
SERIES
VOLTAGE CODE:
17 = 200-3-60
28 = 230-3-60
40 = 380-3-60
46 = 460-3-60
58 = 575-3-60
B
DEVELOPMENT
LEVEL
B
X= ACROSS
THE LINE
REFRIGERANT = R-410a
Products are produced at a
facility whose quality-
management systems are
ISO9001 certified.
MODEL
050T
060T
070T
080T
090T
095T
100T
115T
130T
150T
170T
200T
UNIT DESIGNATOR
H = High Efficiency
S = Standard Efficiency
FORM QWC3-EG1 (217)
QUANTECH 3
Table of Contents
EQUIPMENT OVERVIEW........................................................................................................................................ 5
MICROPROCESSOR CONTROLS ......................................................................................................................... 8
ACCESSORIES AND OPTIONS ........................................................................................................................... 11
REFRIGERANT FLOW DIAGRAM........................................................................................................................ 14
DESIGN PARAMETERS ....................................................................................................................................... 15
PRESSURE DROP CURVES ................................................................................................................................ 16
SELECTION DATA................................................................................................................................................. 18
APPLICATION DATA............................................................................................................................................. 22
RATINGS................................................................................................................................................................ 24
PART LOAD RATINGS.......................................................................................................................................... 29
PHYSICAL DATA................................................................................................................................................... 30
ISOLATOR SELECTION DATA ............................................................................................................................. 32
ISOLATOR INFORMATION ................................................................................................................................... 33
SOUND DATA ........................................................................................................................................................ 36
UNIT DIMENSIONS - FOUR COMPRESSOR....................................................................................................... 38
SINGLE POINT ELECTRICAL DATA .................................................................................................................... 42
ELECTRICAL NOTES ........................................................................................................................................... 54
GROUND WIRE SIZING ........................................................................................................................................ 55
TYPICAL CONTROL PANEL WIRING .................................................................................................................. 56
CUSTOMER WIRING INFORMATION .................................................................................................................. 60
GUIDE SPECIFICATIONS ..................................................................................................................................... 62
SI METRIC CONVERSION .................................................................................................................................... 69
QUANTECH
FORM QWC3-EG1 (217)
4
THIS PAGE INTENTIONALLY LEFT BLANK.
FORM QWC3-EG1 (217)
QUANTECH 5
Quantech QWC3 Water-Cooled chillers provide chilled water for all air conditioning ap-
plications that use central station air handling or terminal units. They are completely self-
contained and are designed for indoor (new or retrofit) installation. Each unit includes
hermetic scroll compressors, a liquid evaporator, water cooled condenser, and a user-
friendly, Microcomputer Control Center mounted on a rugged steel base. The units are
produced at an ISO 9001 registered facility. The QWC3 chillers are rated in accordance
with AHRI Standard 550/590.
The chiller will be completely assembled with all interconnecting refrigerant piping and
internal wiring, ready for field installation.
The unit will be pressure-tested, evacuated, and charged with Refrigerant-410A, and syn-
thetic oil (POE). There will be an operational test, with water flowing through the evapora-
tor, to check that each control device operates correctly.
The unit can be covered with an optional overspray coat of Caribbean Blue enamel. Units
are designed in accordance with NFPA 70 (National Electric Code), ASHRAE/ANSI 15
Safety Code for Mechanical Refrigeration. All units are produced at an ISO 9001 regis-
tered facility. All QWC3 chillers are rated in accordance with AHRI Standard 550/590 at
AHRI conditions.
COMPRESSORS
The chiller has suction-gas cooled, hermetic, scroll compressors. The QWC3 compres-
sors incorporate a compliant scroll design in both the axial and radial direction. All rotating
parts are statically and dynamically balanced. A large internal volume provides greater
liquid tolerance. Compressor crankcase heaters are also included for extra protection
against liquid migration. All compressors are mounted on isolator pads to reduce trans-
mission of vibration to the rest of the unit.
EVAPORATOR
The dual-circuit evaporator will be the direct-expansion type, with refrigerant in the tubes
and chilled liquid flowing through the baffled shell. The design working pressure of the
shell (liquid) side will be 150 PSIG (10.3 bar), and 400 PSIG (27.6 bar) for the tube (re-
frigerant) side.
The evaporator will be constructed and tested in accordance with the applicable sections
of the ASME Pressure Vessel Code, Section VlII, Division (1). The water side will be ex-
empt per paragraph U-1, (C), (6).
The removable heads will allow access to the internally enhanced, seamless, copper
tubes. Vent and drain connections will be included. Nozzle connections are grooved to
accept ANSI/AWWA C-606 couplings.
The evaporator will be covered with 3/4” (19.1 mm) flexible, closed-cell, foam insulation
(K = 0.25).
Equipment Overview
QUANTECH
FORM QWC3-EG1 (217)
6
CONDENSER
The condenser is a cleanable thru-tube type with steel shell, copper tubes, removable
water heads, and includes integral subcooling. The design working pressure of the shell
(refrigerant) side will be 560 PSIG (38.6 bar) and 150 PSIG (10.3 bar) for the tube (liquid)
side. The shell will be constructed and tested in accordance with section Vll, division 1 of
the ASME pressure-vessel code. The water side is exempt per paragraph U-1, (C), (6)
of section VlII, division 1 of the ASME pressure-vessel code. The condenser is equipped
with relief valves and will hold the full refrigerant charge for pumpdown. Water connec-
tions are grooved to accept ANSI/AWWA C-606 couplings. Vent and drain connections
are included.
REFRIGERANT CIRCUIT
Two independent refrigerant circuits will be furnished on each unit. All piping will be cop-
per with brazed joints. The liquid line will include: a shutoff valve with charging port; sight-
glass with moisture indicator; thermal expansion valve; solenoid valve; and high-absorp-
tion removable-core filter drier. The entire suction line and the liquid line between the
expansion valve and the cooler will be insulated with flexible, closed-cell, foam insulation.
AHRI CERTIFICATION PROGRAM
QWC3 chillers have been tested and certified by Air-Conditioning, Heating and Refrigera-
tion Institute (AHRI) in accordance with the latest edition of AHRI Standard 550/590 (I-P).
Under this Certification Program, chillers are regularly tested in strict compliance with this
Standard. This provides an independent, third-party verification of chiller performance.
Refer to the AHRI site at www.ahrinet.org/ for complete Program Scope, Inclusions, and
Exclusions as some options listed herein fall outside the scope of the AHRI certification
program. For verification of certification, go to the AHRI Directory at www.ahridirectory.
org.
Rated in accordance with the latest
issuance of AHRI Standard 550/590
and 551/591.
Equipment Overview (Cont'd)
FORM QWC3-EG1 (217)
QUANTECH 7
Equipment Overview (Cont'd)
POWER AND CONTROL PANELS
All controls and motor starting equipment necessary for unit operation shall be factory
wired and function tested. The panel enclosures shall be designed to NEMA 1 (IP 32) and
manufactured from powder-painted galvanized steel.
The Power and Control Panel shall be divided into a power section for each electrical
system, a common input section and a control section.
Each power panel shall contain:
• Compressor starting contactors
• Control-circuit serving compressor capacity control
• Compressor
• Contactor coils
• Compressor motor overloads
The compressor motor overloads contain current transformers which sense each phase,
as an input to the microprocessor, to protect the compressor motors from damage due to:
• Low input current
• High input current
• Unbalanced current
• Single phasing
• Phase reversal
• Compressor locked rotor
The common input section shall contain:
• Control supply transformer providing 115V
• Customer relay board
• Control circuit switch disconnect/emergency stop device
QUANTECH
FORM QWC3-EG1 (217)
8
MICROPROCESSOR CONTROLS
The control section shall contain:
• On/Off rocker switch
• Microcomputer keypad and display
• Microprocessor board
• I/O expansion board
• Relay boards
• 24V fused power-supply board
The control display shall include:
• Liquid Crystal Display with Light Emitting Diode backlighting for outdoor viewing
• Two display lines
• Twenty characters per line
Color coded 12-button non-tactile keypad with sections for display/print of typical informa-
tion:
• Chilled liquid temperatures
• System pressures (each circuit)
• Operating hours and starts (each compressor)
• Print calls up to the liquid crystal display
• Operating data for the systems
• History of fault shutdown data for up to the last six fault shutdown conditions
• An RS-232 port, in conjunction with this press-to-print button, is provided to permit
the capability of hard copy print-outs via a separate printer (by others)
Entry section to:
• ENTER setpoints or modify system values
Setpoints updating can be performed to:
• Chilled liquid temperature setpoint and range
• Remote reset temperature range
• Set daily schedule/holiday for start/stop
• Manual override for servicing
• Number of compressors
Microprocessor Controls
FORM QWC3-EG1 (217)
QUANTECH 9
• Low liquid temperature cutout
• Low suction pressure cutout
• High discharge pressure cutout
• Anti-recycle timer (compressor start cycle time)
• Anti-coincident timer (delay compressor starts)
Unit section to:
• Set time
• Set unit options
The microprocessor control center is capable of displaying the following:
• Return and leaving chilled liquid temperature
• Low leaving liquid temperature cutout setting
• English or Metric data
• Suction pressure cutout setting
• Each system suction pressure
• Discharge pressure
• Liquid Temperature Reset via a Building Automation System via one of the following:
• 0-20 VDC input, 0-10 VDC input or a 4-20mA input
• Anti-recycle timer status for each system
• Anti-coincident system start timer condition
• Compressor run status
• No cooling load condition
• Day, date and time
• Daily start/stop times
• Holiday status
• Automatic or manual system lead/lag control
• Lead system definition
• Compressor starts & operating hours (each compressor)
• Status of hot gas valves (if supplied)
• Run permissive status
• Number of compressors running
• Liquid solenoid valve status
• Load & unload timer status
Microprocessor Controls (Cont'd)
QUANTECH
FORM QWC3-EG1 (217)
10
The standard controls shall include: brine chilling, automatic pumpdown, run signal con-
tacts, demand load limit form external building automation system input, remote reset
liquid temperature reset input, unit alarm contacts, chilled liquid pump control, automatic
reset after power failure, and automatic system optimization to match operating condi-
tions. A non-reversing heat pump function (leaving condenser temperature control) is also
standard.
The operating program software shall be stored in nonvolatile memory (EPROM) to elimi-
nate chiller failure due to AC power failure. Programmed setpoints are retained in lithium
battery-backed regulated time clock (RTC) memory for 5 years minimum.
COMMUNICATIONS
• Native communication capability for BACnet (MS/TP) and Modbus
• Optional communciation available for N2 and LON via eLink option
Microprocessor Controls (Cont'd)
Tabla de contenidos
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