Quantech QCC3 Manuel utilisateur
FORM QCC3-EG1 (517)
MODEL QCC3
AIR-COOLED SCROLL COMPRESSOR
CONDENSING UNITS
STYLE A
80 – 160 TON
281 – 562 kW
60 Hz
R-410A
QUANTECH
FORM QCC3-EG1 (517)
2
Approvals
• ASME Boiler and Pressure Vessel Code – Section Vlll Division 1
• 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
QC C 3 145C Z E 46 X C
Quantech Air-Cooled Scroll
Condensing Units
UNIT
Z = STANDARD EFFICIENCY
Y = HIGH EFFICIENCY
REFRIGERANT
R-410a
DESIGN SERIES
CONDENSING
NOMINAL CAPACITY
VOLTAGE CODE:
17 = 200-3-60
28 = 230-3-60
40 = 380-3-60
46 = 460-3-60
58 = 575-3-60
TYPE START
X = ACROSS THE LINE
FORM QCC3-EG1 (517)
QUANTECH 3
Table Of Contents
INTRODUCTION...................................................................................................................................................... 5
CONTROL CENTER ................................................................................................................................................ 6
ACCESSORIES AND OPTIONS ........................................................................................................................... 10
SELECTION DATA................................................................................................................................................. 13
RATINGS................................................................................................................................................................ 18
PART LOAD RATINGS.......................................................................................................................................... 24
PHYSICAL DATA................................................................................................................................................... 25
DIMENSION DRAWINGS ...................................................................................................................................... 26
ISOLATORS........................................................................................................................................................... 29
ELECTRICAL DATA .............................................................................................................................................. 34
ELECTRICAL NOTES ........................................................................................................................................... 38
ELECTRICAL DRAWINGS .................................................................................................................................... 40
APPLICATION DATA............................................................................................................................................. 50
GUIDE SPECIFICATIONS ..................................................................................................................................... 52
QUANTECH
FORM QCC3-EG1 (517)
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FORM QCC3-EG1 (517)
QUANTECH 5
GENERAL
The 80-160 Ton (273 - 560 kW) QCC3 Condensing Unit Models are shipped complete
from the factory ready for field installation.
The unit is pressure-tested, evacuated and given a nitrogen holding charge and includes
an initial oil charge (R-410A refrigerant supplied by others). After assembly, a operational
test is performed to assure that each control device operates correctly.
The unit structure is heavy-gauge, galvanized steel. This galvanized steel is coated with
baked-on powder paint, which, when subjected to ASTM B117 1000 hour, salt spray test-
ing, yields a minimum ASTM 1654 rating of “6”. Units are designed in accordance with
NFPA 70 (National Electric Code), ASHRAE/ANSI 15 Safety code for mechanical refrig-
eration, and are cETL listed. All units are produced at an ISO 9000-registered facility.
COMPRESSORS
The chiller has suction-gas cooled, hermetic, scroll compressors. The compressors in-
corporate a compliant scroll design in both the axial and radial direction. All rotating parts
of the compressors 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.
CONDENSER
Coils – Fin and tube condenser coils of seamless, internally-enhanced, corrosion resis-
tant copper tubes are arranged in staggered rows, mechanically expanded into aluminum
fins. Integral subcooling is included. The design working pressure of the coil is 650 psig
(45 barg).
Fans – The condenser fans are composed of corrosion-resistant aluminum hub and glass-
fiber-reinforced polypropylene composite blades molded into a low noise airfoil section.
The are designed for maximum efficiency and are statically and dynamically balanced for
vibration free operation. They are directly driven by independent motors, and positioned
for vertical air discharge. The fan guards are constructed of heavy-gauge, rust-resistant,
coated steel. All blades are statically and dynamically balanced for vibration-free opera-
tion.
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.
REFRIGERANT CIRCUIT
Two independent refrigerant circuits will be furnished on each unit. All unit piping will be
copper, with brazed joints. The liquid line will include a field connection shutoff valve with
charging port located on each condenser circuit. Suction line connections are provided on
each refrigeration circuit. A filter drier and sight glass are shipped loose for field installation
on each refrigerant circuit.
All expansion valves, liquid line solenoid valves, refrigerant, and refrigerant field piping
are supplied by others.
Introduction
QUANTECH
FORM QCC3-EG1 (517)
6
Control Center
All controls are contained in a NEMA 3R/12 cabinet with hinged outer door and include:
Liquid Crystal Display with light emitting diode (LED) backlighting suitable for outdoor
viewing:
• Two display lines
• Twenty characters per line
Color coded 12-button keypad with sections for:
DISPLAY/PRINT of typical information:
• Suction temperatures (optional)
• Ambient temperature
• 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).
FIGURE 1 - CONTROL PANEL WITH KEYBOARD
LD22323
FORM QCC3-EG1 (517)
QUANTECH 7
Control Center (Cont'd)
ENTRY section to:
• Enter SETPOINTS or modify SYSTEM VALUES SETPOINTS updating can be per-
formed to:
• Suction pressure setting
• Suction pressure control zone
• Remote reset temperature range
• Set daily schedule/holiday for start/stop
• Manual override for servicing
• Low and high ambient cutouts
• Number of compressors
• 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 clock
• Set options
• Set unit option
Set unit control for Discharge Air Temperature Control or for Suction Pressure Control
(requires Suction Pressure Transducers – standard.
UNIT ON/OFF switch
The microprocessor control center is capable of displaying the following:
• Suction temperatures (optional)
• Low ambient temperature cutout setting
• Outdoor air temperature
• English or Metric data
• Suction pressure cutout setting
• Each system suction pressure
• System discharge pressure
• Discharge Air Temperature Reset via a Quantech ISN DDC or Building Automation
System (by oth ers) 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
QUANTECH
FORM QCC3-EG1 (517)
8
Control Center (Cont'd)
• 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 (Discharge Air Temperature control
only)
• Automatic lead/lag of compressors within a system
• Compressor starts & operating hours (each compressor)
• Status of hot gas valves, and fan operation
• Run permissive status
• Number of compressors running
• Liquid solenoid valve status
• Load & unload timer status
Provisions are included for: pumpdown at shutdown; optional remote discharge air tem-
perature reset and two steps of demand load limiting from an external building automation
system. Unit alarm contacts are standard.
The operating program is stored in non-volatile memory (EPROM) to eliminate chiller
failure due to AC powered
failure/battery discharge. Programmed setpoints are retained in lithium battery-backed
RTC memory for 5 years minimum.
Ambient Kit (High) – Required if units are to operate when the ambient temperature is
above 115°F (46°C). Includes sun shield panels and discharge pressure transducers.
(This option includes the Discharge Pressure Transducer /Readout Capability option).
(Field mounted).
COMMUNICATIONS
• Native communication capability for BACnet (MS/TP) and Modbus
• Optional communciation available for N2 and LON via eLink option
FORM QCC3-EG1 (517)
QUANTECH 9
Control Center (Cont'd)
POWER PANEL
Each panel contains:
• Compressor power terminals
• Compressor motor starting contactors per l.E.C.*
• Control power terminals to accept incoming for 115-1-60 control power
• Fan contactors & overload current protection
The power wiring is routed through liquid-tight conduit to the compressors and fans.
* International Electrotechnical Commission
QUANTECH
FORM QCC3-EG1 (517)
10
Accessories and Options
All options are factory installed unless otherwise noted.
COMPRESSOR AND PIPING OPTIONS:
Chicago Code Relief Valves – Unit will be provided with relief valves to meet Chicago
code requirements.
Hot Gas By-Pass – Permits continuous, stable operation at capacities below the mini-
mum step of compressor by unloading to as low as 5% capacity (depending on both the
unit and operating conditions). This is accomplished by introducing an artificial load. Hot
gas by-pass is available installed on refrigerant system #1 or on both systems of two cir-
cuited units..
Service Isolation Valve – Service suction and discharge (ball-type) isolation valves are
added to unit per system. This option also includes a system high pressure relief valve in
compliance with ASHRAE 15.
CONDENSER AND CABINET OPTIONS:
Condenser coil protection against corrosive environments is available by choosing any of
the following options. For additional application recommendations, refer to FORM 150.12-
ES1.
Pre-Coated Fin Condenser Coils – The condenser coils are constructed of black epoxy-
coated aluminum fins. This can provide corrosion resistance comparable to copper-fin
coils in typical seashore locations. Either these or the post-coated coils (below), are rec-
ommended for units being installed at the seashore or where salt spray may hit the unit.
Post-Coated Dipped Condenser Coils – The unit is built with dipped and cured con-
denser coils. This is another choice for seashore and other corrosive applications (with
the exception of strong alkalies, oxidizers and wet bromine, chlorine and fluorine in con-
centrations greater than 100 ppm).
Copper-Fin Condenser Coils – The unit constructed with condenser coils which have
copper fins. (This is not recommended for units in areas where they may be exposed to
acid rain).
Enclosure Panels (Unit) – Tamperproof Enclosure Panels prevent unauthorized access
to units. Enclosure Panels can provide an aesthetically pleasing alternative to expensive
fencing. Additionally, for proper head pressure control, Quantech recommends the use of
Condenser Louvered Panels for winter applications where wind gusts may exceed five
mph (eight km/h).
The following types of enclosure panels are available:
Wire Panels (Full Unit) – Consists of welded-wiremesh guards mounted on the exterior
of the unit. Prevents unauthorized access, yet provides free air flow.
Wire/Louvered Panels – Consists of welded-wire-mesh panels on the bottom part of unit
and louvered panels on the condenser section of the unit.
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