Quantech QTC2015T Manuale utente
LD18973a
FORM QTC2-EG1 (515)
MODEL QTC2
AIR-COOLED SCROLL CHILLERS
15 – 46 TON
53-162 kW
60 Hz
R-410A
QUANTECH
FORM QTC2-eg1 (515)
2
Approvals
• ASME Boiler and Pressure Vessel Code – Section Vlll Division 1.
• AHRI Standard 550/590.
• UL 1995 – Heating and Cooling Equipment
• 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
Nomenclature
QUANTECH CHILLER MODEL NUMBER
DESIGN SERIES
VOLTAGE CODE:
17 = 200-3-60
28 = 230-3-60
40 = 380-3-60
46 = 460-3-60
58 = 575-3-60
DEVELOPMENT
LEVEL
Products are produced at a
facility whose quality-
management systems are
ISO9001 certified.
QTC2015TE E 46 X E B
REFRIGERANT = R-410A
X= ACROSS
THE LINE
FORM QTC2-eg1 (515)
QUANTECH 3
Table Of Contents
INTRODUCTION...................................................................................................................................................... 5
MICROCOMPUTER CONTROL CENTER .............................................................................................................. 7
ACCESSORIES AND OPTIONS ........................................................................................................................... 10
DESIGN PARAMETERS........................................................................................................................................ 13
WATER PRESSURE DROP................................................................................................................................... 14
PHYSICAL DATA AND NOMINAL RATINGS........................................................................................................ 16
PART LOAD RATINGS ......................................................................................................................................... 18
UNIT DIMENSIONS - ENGLISH ........................................................................................................................... 20
UNIT DIMENSIONS - METRIC .............................................................................................................................. 34
ISOLATOR DETAILS ............................................................................................................................................. 48
ELECTRICAL DATA - 60HZ .................................................................................................................................. 52
ELECTRICAL NOTES ........................................................................................................................................... 54
CIRCUIT BREAKER CALCULATIONS ................................................................................................................. 56
POWER WIRING.................................................................................................................................................... 57
CONTROL WIRING ............................................................................................................................................... 60
APPLICATION DATA............................................................................................................................................. 61
GUIDE SPECIFICATIONS ..................................................................................................................................... 64
Performance data provided in this document was created in accordance with Quantech software: YW version 13.02.
QUANTECH
FORM QTC2-eg1 (515)
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This Page inTenTionally lefT Blank.
FORM QTC2-eg1 (515)
QUANTECH 5
Quantech™ is proud to present the Model QTC2 Air-Cooled Scroll Chiller.
The QTC2 Air-Cooled Scroll Chillers provide chilled water for all air conditioning applica-
tions using central station air handling or terminal units. They are completely self-con-
tained and are designed for outdoor (roof or ground level) installation. Each unit includes
hermetic scroll compressors, a liquid cooler, air-cooled condenser, a charge of refrigerant
R-410A, and a weather resistant microprocessor control center, all mounted on a rugged,
formed-steel base.
GENERAL
The 15 - 46 Ton (53 - 162 kW) QTC2 models are shipped complete from the factory ready
for installation and use.
The unit is pressure-tested, evacuated, and fully charged with Refrigerant-410A and in-
cludes an initial oil charge. After assembly, a complete operational test is performed with
water flowing through the cooler to assure that the refrigeration circuit operates correctly.
The unit structure is heavy-gauge, galvanized steel. The steel is coated with baked-on
powder paint, which, when subjected to ASTM B117 1000 hour, salt spray testing, yields
a minimum ASTM 1654 rating of “6”. Corrosion resistant wire mesh panels are added to
protect the condenser coil from incidental damage and restrict unauthorized access to
internal components. Unit also includes service isolation valves as standard. Units are
designed in accordance with NFPA 70 (National Electric Code), ASHRAE/ANSI 15 Safety
code for mechanical refrigeration, ASME, listed and labeled with Intertek Testing Services
(ETL) and rated in accordance with the latest version of AHRI Standard 550/590.
COMPRESSORS
The chiller has suction-gas cooled, hermetic, scroll compressors. The compressors incor-
porate a scroll design that is compliant in both the axial and radial direction. All rotating
parts are statically and dynamically balanced. A large internal volume and oil reservoir
provides greater liquid tolerance. Compressor crankcase heaters are also included for
extra protection against liquid migration.
COOLER
Brazed plate heat exchangers are UL (Underwriters Laboratories) listed. Installing con-
tractor must include accommodations in the chilled water piping to allow proper drainage
and venting of the heat exchanger. Water inlet and outlet connections are grooved for
compatibility with factory supplied ANSI/AWWA C-606 connections.
The cooler is equipped with a heater controlled by a separate thermostat. The heater
provides freeze protection for the cooler down to -20°F (-29°C) ambient. The cooler is
coveredwith3/4”(19mm)flexible,closed-cell,foaminsulation(K≈0.25).
Introduction
QUANTECH
FORM QTC2-eg1 (515)
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Introduction (Cont'd)
A 40 mesh strainer (0.5 and 1.5 mm) is recommended upstream of the heat exchanger to
prevent clogging.
CONDENSER
Coils – Fin and tube condenser coils of seamless, internally-enhanced, high-condensing-
coefficient, corrosion resistant copper tubes are arranged in staggered rows, mechani-
cally expanded into aluminum fins. Integral subcooling is included. The design working
pressure of the coil is 650 PSIG (45 barg).
Low Sound Fans – The condenser fans are composed of corrosion resistant aluminum
hub and composite blades molded into a low noise airfoil section. They are designed for
maximum efficiency and are statically and dynamically balanced for vibration-free opera-
tion. They are directly driven, and positioned for vertical air discharge. The fan guards are
constructed of heavy-gauge, rust-resistant, PVC (polyvinyl chloride)-coated steel wire.
Motors – The fan motors are Totally Enclosed Air-Over, squirrel-cage type, current pro-
tected. They feature ball bearings that are double-sealed and permanently lubricated.
FORM QTC2-eg1 (515)
QUANTECH 7
All controls are contained in a NEMA 3R powder painted steel cabinet with a gasketed
door and include:
Liquid Crystal Display (LCD) with Light Emitting Diode (LED) 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 information:
• Chilled liquid temperatures
• Ambient temperature
• System pressures (each circuit)
• Operating hours and starts (each compressor)
• Print calls up to the LCD
• 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.
• Chilled liquid temperature setpoint and range.
• Remote reset temperature range.
• Set daily schedule/holiday for start/stop.
• Manual override for servicing.
• Low and high ambient cutouts.
• Number of compressors.
• Low liquid temperature cutout.
• Low suction pressure cutout.
• High discharge pressure cutout.
MicroComputer Control Center
QUANTECH
FORM QTC2-eg1 (515)
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MicroComputer Control Center (Cont'd)
• Anti-recycle timer (compressor start cycle time)
• Anti-coincident timer (delay compressor starts).
• UNIT section to:
• Set time.
• Set unit options.
• UNIT ON/OFF switch.
The microprocessor control center is capable of displaying the following:
• Return and leaving liquid temperature.
• Low leaving liquid temperature cutout setting.
• Low ambient temperature cutout setting.
• Outdoor air temperature.
• English or Metric data.
• Suction pressure cutout setting.
• Each system suction pressure.
• Discharge pressure (optional).
• Liquid Temperature Reset via a Quantech ISN DDC or building automation system
(by others) via:
• A pulse width modulated (PWM) input as standard.
• A 4-20 milliamp or 0 -10 VDC input, or contact closure with the optional B.A.S.
interface option.
• 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.
• Leadsystemdenition.
• Compressor starts and operating hours (each compressor).
FORM QTC2-eg1 (515)
QUANTECH 9
• Status of hot gas valves, evaporator heater and fan operation.
• Run permissive status.
• Number of compressors running.
• Liquid solenoid valve status.
• Load & unload timer status.
• Water pump status.
MicroComputer Control Center (Cont'd)
QUANTECH
FORM QTC2-eg1 (515)
10
Accessories and Options
All options are factory installed unless otherwise noted.
ELECTRICAL OPTIONS
Single-Point Non-Fused Disconnect Switch – Unit-mounted disconnect switch with ex-
ternal, lockable handle (in compliance with Article 440-14 of N.E.C.), can be supplied to
isolate the unit power voltage for servicing. Separate external fusing must be supplied,
by others in the power wiring, which must comply with the National Electrical Code and/
or local codes.
Single-Point Circuit Breaker – A unit mounted circuit breaker with external, lockable
handle (in compliance with N.E.C. Article 440-14), can be supplied to isolate the power
for servicing. (This option includes the Single-Point Power connection.)
Control Transformer – Converts unit power voltage to 115-1-60 or 115-1-50 if 50Hz is
selected (0.5 or 1.0 KVA capacity). Factory mounting includes primary and secondary wir-
ing between the transformer and the control panel.
CONTROL OPTIONS
Ambient Kit (Low) – Standard units will operate to 25°F (-4°C). This accessory includes
all necessary components to permit chiller operation to 0°F (-18°C). (This option includes
the Discharge Pressure Transducer/Readout Capability option.) For proper head pres-
sure control in applications below 25°F (-4°C), where wind gusts may exceed five mph, it
is recommended that Optional Condenser Louvered Enclosure Panels also be included.
Ambient Kit (High) – Required if units are to operate when the ambient temperature is
above 110°F (43°C). Includes discharge pressure transducers. (This option includes the
Discharge Pressure Transducer/ReadoutCapability option.) (Field-Mounted.)
Language LCD And Keypad Display – Spanish, French, and German unit LCD controls
and keypad display available. Standard language is English.
Discharge Pressure Transducers And Readout Capability – The addition of pressure
transducers allows models to sense and display discharge pressure. This is recommend-
ed for glycol chilling applications. (This option is included with either the low or high ambi-
ent kits.)
Suction Pressure Transducers – Permits unit to sense and display suction pressure.
This capability is standard.
Motor Current Module – Capable of monitoring compressor motor current. Provides
extra protection against compressor reverse rotation, phase-loss and phase imbalance.
Option consists of one module per electrical system.
COMPRESSOR, PIPING, EVAPORATOR OPTIONS
Low Temperature Glycol – Required for glycol chilling below 30°F (-1°C) leaving glycol
temperature. Option includes resized thermal expansion valve.
Chicago Code Relief Valves – Unit will be provided with relief valves to meet Chicago
code requirements.
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