McQuay WHS E XE Technical manual Eng

McQuay WHS E XE Technical manual Eng
Product Manual
805 B – 04/11 E
Date: November 2004
Supersedes: 805 B – 04/04 D
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McQuay is participating in the Eurovent Certification Programme.
Product are as listed in the Eurovent Directory of Certified Products
and on the web site www .eurovent-certification. com
805 B – 04/11 E – pag. 2/24
New water cooled screw chillers McQuay WHS XE
McQuay International introduces their newest water cooled screw chillers equipped with new single screw
compressors.
McQuay water cooled WHS chillers equipped with 1 or 2 McQuay screw compressors are a new range of the unit
using the Frame 4 single screw compressors. They are manufactured by McQuay to satisfy the requirements of
the consultants and the end user. McQuay WHS units are designed to minimise energy costs while maximising the
refrigeration capacities. Once again McQuay has developed a line of chillers unsurpassed in performance and
quality that will meet the most stringent requirements of comfort cooling, ice storage and process applications.
McQuay’s chiller design experience, combined with outstanding features makes the WHS chiller unmatched in the
industry.
Lower noise – higher flexibility
The McQuay original compressor design with a single screw and twin rotors allows a constant gas flow. This
compression process completely eliminates gas pulsations. The oil injection also results in significant mechanical
noise reduction.
The twin gas compressor discharge chambers are designed to act as attenuators, based on the harmonic wave
principle with destructive interference, thus always resulting equal to zero. The extremely low noise compressor
performance affords the use of WHS chiller for all applications.
The reduced number of vibrations produced from the WHS chillers offers a surprisingly quiet operation eliminating
the noise transmission through the structure and the chilled water piping system.
Infinitely variable capacity control
Cooling capacity control is infinitely variable by means of a capacity slide controlled by microprocessor system.
Each unit has infinitely variable capacity control down to 12.5% (two compressors units), to 25% (one compressor
unit). This modulation allows the compressor capacity to exactly match the building cooling load. The result is a
decrease in chiller energy costs, particularly at the part-load conditions at which the chiller operates most of the
time. In order to optimize control sequence, each compressor load (and unload) from 95 to 100 % of its capacity
by one step.
Unmatched serviceability
Field serviceability has not been sacrificed. Inspection covers allows visual inspection of the main screw and
gaterotors. Suction valves allow easy isolation and field servicing of this unit.
Outstanding reliability features
Full factory testing of all the units ensures a trouble free start-up. Extensive test makes certain that each safety
and operating control is properly adjusted, and operates correctly.
General characteristics
Structure
The chiller is equipped with brackets directly installed on heat exchangers. The evaporator and the suction piping
are appropriately insulated to prevent condensation. Unit is provided with lifting holes.
Ecological HFC 134a refrigerant
McQuay has designed and optimized StargateTM compressors to operate with HFC 134a, ecological refrigerant
with zero ODP (Ozone Depletion Potential) and very low GWP (Global Warming Potential) that means low value of
the “direct effect” in the formula of TEWI (Total Equivalent Warming Impact).
Screw compressors
The newest StargateTM single-screw compressor has a well balanced compression mechanism which cancels the
screw rotor load in both the radial and axial directions. Inherent to the basic single-screw compressor design is the
virtually load-free operation, that gives main bearing design life of 3-4 times greater than twin-screws, and
eliminates expensive and complicated thrust balancing schemes. The two exactly opposed gaterotors create two
exactly opposed compression cycles. Compression is made at the lower and upper parts of the screw rotor at the
same time, thus cancelling the radial loads. Also, both ends of the screw rotor are subjected to suction pressure
only, which cancels the axial loads and eliminates the huge thrust loads inherent in twin-screw compressors.
805 B – 04/11 E – pag. 3/24
Oil injection is used for these compressors in order to get
high COP at high condensing pressure. WHS units are
provided with an high efficiency oil separator to maximise
oil extraction.
Compressors have a infinitely variable capacity control
down to 25% of its total capacity. This control is made by
means of capacity slides controlled by microprocessors.
Standard start is star-delta type; Soft start type is available
(as option) in order to have lower inrush current.
Evaporator
The evaporator is a direct expansion type with refrigerant
inside the copper tubes and water on the outside. The
evaporators are manufactured with carbon steel shells,
high efficiency copper tubes and polypropylene baffles. The copper tubes are roll expanded into carbon steel tube
plates.
Condensers
Condensers are shell and cleanable, through-tube type. Standard configuration is 2 passes. The unit has
indenpendent condensers, one per circuit. Each condenser has a carbon steel and seamless, integrally finned
high efficiency copper tubes, roll expanded into heavy carbon steel tube sheets. Water heads are removable and
include vent and drain plugs. Condensers come complete with liquid shut-off valve, spring loaded relief valve.
Electronic expansion valve
The WHS water cooled chiller is equipped with the most advanced electronic expansion valve to achieve precise
control of refrigerant mass flow. As today’s system requires improved energy efficiency, tighter temperature
control, wider range of operating conditions and incorporate new features like remote monitoring and diagnostics,
the application of electronic expansion valves becomes mandatory. WHS’s electronic expansion valve proposes
features that makes it unique: short opening and closing time, high resolution, positive shut-off function to
eliminate use of additional solenoid valve, highly linear flow capacity, continous modulation of mass flow without
stress in the refrigerant circuit and corrosion resistance stainless steel body.
Electrical control panel
Power and control are located into two sections of the main panel that is manufactured to insure protection for all
weather conditions.
The power panel is fitted with a interlocked door main isolator to prevent access while power supply is on.
Electrical panel is IP43.
Power section includes - The power section includes contactors, all compressors fuses, and control circuit
transformer. Additional space is provided for an easy installation of the various optional accessories provided to
enhance the WHS units capabilities.
Certifications
All the WHS units are CE marked (89/392). McQuay Italia obtained ISO 9001:2000.
Water content in cooling circuits
The cooled water distribution circuits should have a minimum water content to avoid excessive compressors start
and stop.
In fact, each time the compressor starts up, an excessive quantity of oil goes from the compressor sump and
simultaneously there is a rise in the temperature of the compressor motor’s stator due to the inrush current during
the start-up. To prevent damage to the compressors, McQuay has envisaged the application of a device to limit
frequent stops and restarts.
During the span of one hour there will be no more than 6 starts of the compressor. The plant side should therefore
ensure that the overall water content allows a more constant functioning of the unit and consequently greater
environmental comfort. The minimum installation water content envisaged should be calculated with a certain
approximation using this simplified formula:
805 B – 04/11 E – pag. 4/24
(1)
Q = 35,83 X
P (kW)
∆T(°C)
X
1
N
where:
Q = Minimum content of the plant expressed in litres
P = Cooling capacity of the plant expressed in kW
∆T = Entering/leaving water temperature difference of the evaporator expressed in °C
N = Number of compressors.
For a more accurate determination of the quantity of water, it is advisable to contact the designer of the plant.
MicroTech II C Plus controller
MicroTech II C Plus controller is installed as standard on all the units; it can be used to modify unit set points and
check control parameters. A display illustrates the machine's operating status, programable values and setpoints
e.g. temperatures, and pressures of fluids (water, refrigerant and air). Device controls maximise the McQuay
chillers energy efficiency and reliability characteristics. It uses sophisticated software with predictive logic to select
the most energy efficient combination of compressor, EEXV and condenser fan to keep stable operating conditions
and maximise energy efficiency. The compressors are automatically rotated to ensure equal operating hours.
MicroTech II protects critical components in response to external signals from its system sensors measuring:
motor temperatures, refrigerant gas and oil pressures, correct phase sequence and evaporator.
Control section - main features:
•
Management of the compressor capacity slide and fans modulation according to the distributed
multiprocessor logic system
•
Chillers enabled to work in partial failure condition thanks to the distributed multiprocessor logic system
•
Full routine operation at condition of:
High ambient temperature value
High thermal load
High evaporator entering water temperature (start-up)
•
Display of evaporator entering/leaving water temperature
•
Display of condensing-evaporating temperature and pressure, suction and discharge superheat for each
circuit
•
Leaving water cooled temperature regulation. Temperature tolerance=0,1°C
•
Compressors and evaporator/condenser pumps hours counter
•
Display of Status Safety Devices
•
Start up numbers and compressors working hours equalization
•
Excellent management of compressors load
•
Fans management according to condensing pressure
•
Automatic re-start in case of power supply interruption (adjustable)
•
Soft Load
•
Return Reset
•
AOT Reset
•
Setpoint Reset
•
Demand limit or Current limit (optional)
Safety for each refrigerant circuit
High pressure (pressure switch)
Low pressure (pressure switch)
805 B – 04/11 E – pag. 5/24
Oil differential pressure switch
Compressor thermal
Condensation fan Magneto-thermal
High Discharge Temperature on the compressor
Phase Monitor
Star / Delta Transition Failed
Low Delta Pressure between Suction and Discharge
Low pressure ratio
High oil pressure drop
Low oil pressure
System security
Phase monitor
Freeze protection
Regulation type
Proportional + integral + derivative regulation on the evaporator output probe.
Condensation
The condensation can be carried out according to temperature or pressure. The fans can be managed according
to ON/OFF mode or with a 0/10 V modulating signal or both (SPEEDTROL).
MicroTech II C Plus terminal
The MicroTech II C Plus terminal has following features:
•
4-lines by 20-character liquid crystal display back lighting
•
Removable and remote key-pad
•
Key-pad consisting of 15 keys “ clear language display ”
•
Memory to protect the data
•
General faults alarm relays
•
4-level password access to modify the setting
•
Service report displaying all running hours and general conditions
MicroPlantTM:
Solution for: tele-maintenance and supervisory systems
MicroTech II can be monitored locally or via modem by MicroPlantTM supervision program, that runs on PC
systems under Windows ’95 – ’98.
MicroPlantTM is the best solution:
•
To centralise all the information in just one local and/or remote PC
•
To check all the parameters for each unit connected
•
Data logging of temperature - pressure
•
Printouts of alarms, parameters and graphs
•
To control several plants located in different geographical areas
from a central station
•
To manage the Service centers
MicroPlantTM allows:
•
Visualization of all working conditions for each controller
805 B – 04/11 E – pag. 6/24
•
Visualization of their graphics
•
Display, print-out of the actual alarms
•
Connection between local and remote computer via telephone line (Modem)
MicroTech II C Plus remote control
Compatibility with supervisory systems is becoming
increasingly important in HVAC. MicroTech II C Plus
allows easy interfacing with BMS (Building
Management Systems), the external world that
can be:
•
•
•
Full compatible Siemens, Johnson;
Every MODBUS compatible system;
( Satchwell, Honeywell )
BacNet point to point, ECHELON FTT10.
( available on request )
Standard Accessories (furnished on basic unit)
Star Delta Compressors starter – For low inrush current and reduced starting torque.
Phase monitor – The phase monitor controls the voltage values on the supply line stopping the unit when the
calibration threshold is reached (± 10%). This safety device is automatically reset.
Evaporator connection water side Victaulic – Hydraulic joint with gasket for an easy and quick water
connection.
Hour run meter – Digital compressors hour run meter.
General fault relay – Contactor for the alarm warning.
Alarm from external device – Microprocessor is able to receive an alarm signal from an external device (pump
etc..). User can decide if this alarm signal will stop or not the unit.
Brine double set point version (CB) – This accessory allows, with an external electric switch supplied by
customer, a dual leaving glycol mixture temperature setpoints. The lower setpoint can go down to -8°C.
Options (on request)
Compressor thermal overload relays - Safety devices against compressor motor overloading in addition to the
normal protection envisaged by the electrical windings.
Ammeter and voltmeter - Digital meters of unit drawn amperes and voltage values, installed on the electrical
control panel.
Condenser power factor correction - Installed on the electrical control panel to ensure it conforms to the plant
rules. (McQuay advices maximum 0,9).
Flow switch - Supplied separately to be wired and installed on the evaporator water piping (by the customer).
Cu-Ni 90-10 condenser – To work with sea water the heat exchangers are fitted with Cu-Ni tubes and special
protection inside the end covers.
Rubber type antivibration mounts - Supplied separately, these are positioned under the base of the unit for
“floor” installation.
Sound proof cabinet - Made of sheet metal and internally insulated, the cabinet is "integral kind" ( around the
whole chiller, not only around the compressors ) to reach the best performance in noise reduction.
805 B – 04/11 E – pag. 7/24
Note: to realize the baseframe consider that the dimensions of the sound proof cabinet are 300 mm longer, 300
mm wider and 200 mm higher than the standard unit.
Suction line shut off valve – Suction shut-off valve installed on the suction port of the compressor to facilitate
maintenance operation.
Witness tests - The units are normally tested at the test bench prior to the shipment. On request, a second test
can be carried out, at customer’s presence, in accordance with the procedures indicated on the test form. (Not
available for units with Glycol mixtures).
Soft start – Electronic starting device to reduce inrush current.
20mm thicked evaporator insulation – Useful in really heavy operating conditions.
Under / Over voltage controller - The device controls the voltage value and stops the chiller when this
exceeds limits set by customer.
Installation notes
Warning
Installation and maintenance are to be performed only by qualified personnel who are familiar with local codes and
regulations, and who are experienced with this type of equipment. Must be avoided the unit installation in places
that could be considered dangerous for all the maintenance operations.
Handling
The chiller is mounted on heavy wooden skids to protect the unit from accidental damage and to permit easy
handling and moving. It is recommended that all moving and handling be performed with the skids under the unit
when possible and that the skids not be removed until the unit is in the final location.
If the unit must be hoisted, it is necessary to lift the unit by attaching cables or chains at the lifting holes in the
evaporator tube sheets. Spreader bars must be used to protect the control cabinet and the other areas of the
chiller.
Location
A levelled and sufficiently strong floor is required. If necessary, additional structural members should be provided
to transfer the weight of the unit to the nearest beams.
Rubber-in-shear isolators can be furnished and field placed under each corner of the package. A rubber anti–skid
pad should be used under isolators if hold-down bolts are not used.
Vibration isolator in all water piping connected to the chiller are recommended to avoid straining the piping and
transmitting vibration and noise.
805 B – 04/11 E – pag. 8/24
Table 1 – Operating limits
WHS 098.1÷272.2
Max evaporator leaving water temperature
Min evaporator leaving water temperature (without glycol)
Min evaporator leaving water temperature (with glycol)
Min evaporator water ∆T
Max evaporator water ∆T
Max condenser leaving water temperature
15
4
-8
4
8
55
WHS XE operating range
60
Leaving condenser water temp. (°C)
HFC 134a
°C
°C
°C
°C
°C
°C
55
50
45
40
35
30
25
20
15
-10
-5
0
5
10
15
20
Leaving evaporator water temp. °C
805 B – 04/11 E – pag. 9/24
Table 2 – Evaporator fouling factors
Fouling factors
m2°C / kW
Cooling capacity
correction factor
Power input
corretion factor
COP
correction factor
0,0176
0,0440
0,0880
0,1320
1,000
0,978
0,957
0,938
1,000
0,986
0,974
0,962
1,000
0,992
0,983
0,975
Table 3 – Condenser fouling factors
Fouling factors
m2°C / kW
Cooling capacity
correction factor
Power input
corretion factor
COP
correction factor
0,0440
0,0880
0,1320
1,000
0,990
0,981
1,000
1,018
1,036
1,000
0,973
0,945
Table 4 – Ethylene glycol and low ambient temperature correction factors
Air ambient temperature °C
% of ethylene glycol by weight
Cooling capacity correction factor
Power input correction factor
Flow rate correction factor
Water pressure drops correction factor
-3
10
0,991
0,996
1,013
1,070
-8
20
0,982
0,992
1,040
1,129
-15
30
0,972
0,986
1,074
1,181
-23
40
0,961
0,976
1,121
1,263
-35
50
0,946
0,966
1,178
1,308
Table 5 – Low temperature operation performance factors
Ethylene glycol/water leaving temperature °C
Min. % of ethylene glycol
Cooling capacity correction factor
Power input compressors correction factor
805 B – 04/11 E – pag. 10/24
2
10
0,842
0,95
0
20
0,785
0,94
-2
20
0,725
0,92
-4
30
0,670
0,89
-6
30
0,613
0,87
-8
30
0,562
0,84
Nomenclature
WHS XE 235 . 2 ST 134
WHS
Water cooled
Screw chiller
XE
High Efficiency
098÷272
Unit size
1
2
N°of compressors
ST
Standard version
134
Refrigerant HFC 134a
805 B – 04/11 E – pag. 11/24
Physical data WHS XE - HFC 134a
“WHS” Unit size
Cooling capacity (1)
Power input (1)
COP
McQuay StargateTM Screw compressor
Refrigerant circuits
Refrigerant charge HFC 134a
Oil charge
Min % of capacity reduction
Evaporator
Evaporators / water volume
Max operating pressure
Condenser
Condensers / water volume
Max operating pressure
Weight and dimensions (cond. 2 passes ∆T 4÷8 °C)
Standard unit shipping weight
Standard unit operating weight
Unit length
Unit width
Unit height
“WHS” Unit size
Cooling capacity (1)
Power input (1)
COP
McQuay StargateTM Screw compressor
Refrigerant circuits
Refrigerant charge HFC 134a
Oil charge
Min % of capacity reduction
Evaporator
Evaporators / water volume
Max operating pressure
Condenser
Condensers / water volume
Max operating pressure
Weight and dimensions (cond. 2 passes ∆T 4÷8 °C)
Standard unit shipping weight
Standard unit operating weight
Unit length
Unit width
Unit height
098.1
118.1
138.1
196.2
No.
No.
kg
l
%
343,5
67,0
5,13
1
1
53
20
25
416,3
81,6
5,10
1
1
63
20
25
485,7
93,6
5,19
1
1
72
20
25
688,5
134,0
5,14
2
2
106
40
12,5
No./l
bar
1/210
10,5
1/350
10,5
1/350
10,5
1/400
10,5
No./l
bar
1/60
10,5
1/63
10,5
1/70
10,5
2/95
10,5
kg
kg
mm
mm
mm
1830
2100
3695
1050
2018
1855
2270
3695
1050
2018
1965
2385
3695
1050
2070
4215
4820
4510
1500
2233
218.2
235.2
254.2
272.2
No.
No.
kg
l
%
764,6
147,7
5,18
2
2
126
40
12,5
827,8
161,0
5,14
2
2
144
40
12,5
894,0
175,1
5,11
2
2
162
40
12,5
956,5
186,9
5,12
2
2
200
40
12,5
No./l
bar
1/400
10,5
1/415
10,5
1/415
10,5
1/415
10,5
No./l
bar
2/100
10,5
2/105
10,5
2/110
10,5
2/115
10,5
kg
kg
mm
mm
mm
4245
4840
4510
1500
2233
4275
4880
4510
1500
2233
4515
5140
4510
1500
2233
4720
5370
4510
1500
2233
kW
kW
kW
kW
Note: (1) Nominal cooling capacity and power input are based on: 12/7 °C entering/leaving evaporator water temperature;
30/35 °C entering/leaving condenser water temperature. The power input is for compressor only.
805 B – 04/11 E – pag. 12/24
Electrical data WHS XE - HFC 134a
WHS unit size
Standard voltage (1)
Nominal unit current (2)
Max unit current (3)
Max unit inrush current star/delta (4)
Max unit current for wires sizing (5)
WHS unit size
Standard voltage (1)
Nominal unit current (2)
Max unit current (3)
Max unit inrush current star/delta (4)
Max unit current for wires sizing (5)
098.1
A
A
A
A
136
183
593
230
218.2
A
A
A
A
287
397
706
490
118.1
138.1
400 V - 3f – 50 Hz
152
167
215
243
593
593
260
320
235.2
254.2
400 V - 3f – 50 Hz
302
317
427
458
710
718
520
580
196.2
272
366
695
460
272.2
332
485
722
640
Note: (1) Allowed voltage tolerance ± 10%. Voltage unbalance between phases must be within ± 3%.
(2) Absorbed current referred to nominal condition: 12/7 °C entering/leaving evaporator water temperature; 30/35 °C
entering/leaving condenser water temperature.
(3) Absorbed current referred to the following conditions: 14/9 °C entering/leaving evaporator water temperature;
50/55°C entering/leaving condenser water temperature.
(4) StarDelta inrush current for the unique compressor (units 098.1÷138.1); absorbed current of compressor n°1 at 75%
+ inrush current of second compressor (units 196.2÷272.2).
(5) Compressor FLA (Full Load Ampere)
805 B – 04/11 E – pag. 13/24
Sound pressure level WHS XE
WHS
Unit size
63 Hz
098.1
118.1
138.1
196.2
218.2
235.2
254.2
272.2
53,6
54,6
56,6
56,6
56,2
56,6
57,1
58,2
-5
Sound pressure level at 1 m from the in free field ( rif. 2 x 10 )
125 Hz
250 Hz
500 Hz
1000 Hz 2000 Hz 4000 Hz 8000 Hz
56,2
57,2
59,2
59,2
58,8
59,2
59,7
60,8
71,1
72,1
74,1
74,1
73,7
74,1
74,6
75,7
74,5
75,5
77,5
77,5
77,1
77,5
78,0
79,1
69,7
70,7
72,7
72,7
72,3
72,7
73,2
74,3
65,6
66,6
68,6
68,6
68,2
68,6
69,1
70,2
63,9
64,9
66,9
66,9
66,5
66,9
67,4
68,5
Sound pressure level WHS XE with sound proof cabinet
WHS
Unit size
63 Hz
59,5
60,5
62,5
62,5
62,1
62,5
63,0
64,1
dBA
75,2
76,2
78,2
78,2
77,8
78,2
78,7
79,8
-5
Sound pressure level at 1 m from the in free field ( rif. 2 x 10 )
125 Hz
250 Hz
500 Hz
1000 Hz 2000 Hz 4000 Hz 8000 Hz
098.1
48,6
49,5
61,6
63,3
56,8
52,1
51,0
118.1
49,6
50,5
62,6
64,3
57,8
53,1
52,0
138.1
51,6
52,5
64,6
66,3
59,8
55,1
54,0
196.2
51,6
52,5
64,6
66,3
59,8
55,1
54,0
218.2
51,2
52,1
64,2
65,9
59,4
54,7
53,6
235.2
51,6
52,5
64,6
66,3
59,8
55,1
54,0
254.2
52,1
53,0
65,1
66,8
60,3
55,6
54,5
272.2
53,2
54,1
66,2
67,9
61,4
56,7
55,6
Note: Average sound pressure level rated in accordance to ISO 3744, free field semispheric conditions.
46,6
47,6
49,6
49,6
49,2
49,6
50,1
51,2
dBA
63,2
64,2
66,2
66,2
65,8
66,2
66,7
67,8
Sound pressure level correction factor for different distances
WHS
Unit size
Distance (m)
1
5
10
15
098.1
0
8,4
13,4
16,5
118.1
0
8,4
13,4
16,5
138.1
0
8,4
13,4
16,5
196.2
0
8
12,9
15,9
218.2
0
8
12,9
15,9
235.2
0
8
12,9
15,9
254.2
0
8
12,9
15,9
272.2
0
8
12,9
15,9
Note: The values in table are in dB(A) and must be detract to those refer at 1m in free field.
805 B – 04/11 E – pag. 14/24
20
25
18,8
18,8
18,8
18.2
18.2
18.2
18.2
18.2
20,7
20,7
20,7
20
20
20
20
20
WHS
unit
size
WHS
098.1
WHS
118.1
WHS
138.1
WHS
196.2
Evaporator
leaving water
temp. (°C)
Standard ratings WHS XE 098.1 ÷ 196.2
ENTERING CONDENSER WATER TEMPERATURE °C
20
25
30
35
40
45
50
Cool.
Power
Cool.
Power
Cool.
Power
Cool.
Power
Cool.
Power
Cool.
Power
Cool.
Power
cap.
input
cap.
input
cap.
input
cap.
input
cap.
input
cap.
input
cap.
input
(kW)
(kW)
(kW)
(kW)
(kW)
(kW)
(kW)
(kW)
(kW)
(kW)
(kW)
(kW)
(kW)
(kW)
4
336,8
51,2
323,7
58,3
309,9
66,0
295,3
74,4
280,2
83,8
264,7
94,1
248,7 105,5
5
348,3
51,6
335,0
58,6
320,8
66,3
306,0
74,7
290,6
84,0
274,6
94,3
258,3 105,7
6
360,1
51,9
346,5
59,0
332,0
66,6
316,9
75,0
301,1
84,3
284,8
94,6
268,1 105,9
7
372,2
52,3
358,2
59,3
343,5
67,0
328,0
75,4
311,8
84,6
295,2
94,8
278,0 106,2
8
384,4
52,6
370,2
59,7
355,1
67,3
339,3
75,7
322,8
84,9
305,7
95,1
288,2 106,4
85,2
316,5
95,4
298,6 106,6
9
--
--
382,4
60,0
367,0
67,6
350,8
76,0
334,0
4
409,5
61,6
392,9
70,8
375,6
80,4
357,6
90,8
339,1 102,1 319,9 114,8 300,2 128,9
5
423,6
61,9
406,6
71,2
388,9
80,8
370,5
91,1
351,5 102,4 331,9 115,0 311,7 129,0
6
438,0
62,3
420,6
71,6
402,4
81,2
383,6
91,5
364,2 102,8 344,1 115,2 323,5 129,1
7
452,6
62,6
434,8
72,0
416,3
81,6
397,0
91,9
377,1 103,1 356,6 115,4 335,6 129,2
8
467,6
63,0
449,4
72,3
430,4
82,0
410,7
92,3
390,4 103,5 369,4 115,7 347,9 129,4
9
--
--
464,2
72,7
444,8
82,5
424,7
92,7
403,9 103,8 382,5 116,0 360,5 129,6
4
478,8
71,7
458,8
81,8
438,4
92,3
417,5 103,8 396,0 116,6 374,0 131,2 351,3 148,1
5
494,9
72,0
474,6
82,1
453,8
92,7
432,5 104,2 410,6 116,9 388,1 131,4 364,9 147,9
6
511,4
72,2
490,8
82,5
469,6
93,2
447,9 104,7 425,5 117,3 402,5 131,6 378,7 147,9
7
528,3
72,3
507,3
82,9
485,7
93,6
463,6 105,1 440,7 117,7 417,2 131,9 392,9 147,9
8
545,5
72,5
524,2
83,2
502,2
94,1
479,6 105,6 456,3 118,2 432,2 132,2 407,3 148,1
9
--
--
541,4
83,5
519,0
94,5
495,9 106,1 472,1 118,7 447,5 132,6 422,1 148,3
4
675,1 102,4 648,8 116,6 621,0 132,0 591,9 148,9 561,6 167,6 530,3 188,2 498,3 211,1
5
698,3 103,2 671,4 117,3 643,0 132,6 613,3 149,5 582,3 168,1 550,3 188,7 517,5 211,5
6
722,0 103,9 694,6 118,0 665,6 133,3 635,1 150,1 603,4 168,7 570,7 189,2 537,1 211,9
7
746,2 104,6 718,2 118,7 688,5 134,0 657,4 150,8 625,0 169,2 591,5 189,7 557,1 212,3
8
770,8 105,3 742,2 119,4 712,0 134,6 680,2 151,4 647,0 169,8 612,8 190,2 577,5 212,8
9
--
--
766,8 120,0 735,8 135,3 703,3 152,0 669,5 170,4 634,4 190,8 598,4 213,3
Note: (1) Nominal cooling capacity and power input are based on ∆T=5°C entering/leaving condenser water temperature; evaporator
fouling factor=0,0176 m2 °C/kW; condenser fouling factor=0,0440 m2 °C/kW.
805 B – 04/11 E – pag. 15/24
WHS
unit
size
WHS
218.2
Evaporator
leaving water
temp. (°C)
Standard ratings WHS XE 218.2 ÷ 272.2
30
35
40
45
50
Cool.
Power
Cool.
Power
Cool.
Power
Cool.
Power
Cool.
Power
Cool.
Power
Cool.
Power
cap.
input
cap.
input
cap.
input
cap.
input
cap.
input
cap.
input
cap.
input
(kW)
(kW)
(kW)
(kW)
(kW)
(kW)
(kW)
(kW)
(kW)
(kW)
(kW)
(kW)
(kW)
(kW)
5
776,6 112,7 746,1 128,9 714,1 146,2 680,7 164,9 646,1 185,3 610,4 208,0 573,7 233,3
6
803,0 113,4 771,8 129,7 739,1 146,9 704,9 165,6 669,5 186,0 632,9 208,5 595,4 233,6
7
829,9 114,1 798,0 130,4 764,6 147,7 729,6 166,3 693,4 186,6 656,0 209,1 617,6 234,0
8
857,4 114,8 824,8 131,1 790,6 148,4 754,9 167,0 717,9 187,3 679,6 209,6 640,3 234,4
--
--
852,1 131,8 817,1 149,1 780,6 167,7 742,8 187,9 703,7 210,2 663,5 234,9
4
814,0 121,2 781,6 139,5 747,7 158,6 712,6 179,2 676,1 201,7 638,5 226,8 599,9 254,9
5
841,7 121,8 808,5 140,2 773,9 159,4 737,9 179,9 700,6 202,3 662,2 227,2 622,6 255,0
6
870,0 122,5 836,0 141,0 800,5 160,2 763,7 180,7 725,7 203,0 686,4 227,6 645,9 255,2
7
898,8 123,2 864,0 141,8 827,8 161,0 790,2 181,5 751,2 203,7 711,1 228,2 669,7 255,5
8
928,2 123,8 892,6 142,5 855,6 161,8 817,2 182,3 777,4 204,4 736,3 228,7 694,1 255,8
--
--
921,9 143,3 884,0 162,7 844,7 183,1 804,1 205,2 762,1 229,3 719,0 256,2
4
880,6 133,2 844,5 152,4 807,3 172,5 769,0 194,4 729,5 218,6 688,9 245,9 647,1 277,1
5
910,3 133,8 873,5 153,1 835,6 173,4 796,5 195,2 756,1 219,2 714,6 246,3 671,9 277,0
6
940,6 134,3 903,2 153,9 864,5 174,2 824,5 196,0 783,3 219,9 740,9 246,7 697,2 277,0
7
971,6 134,9 933,4 154,6 894,0 175,1 853,2 196,8 811,1 220,6 767,7 247,2 723,0 277,1
8
1003,3 135,3 964,3 155,3 924,1 175,9 882,4 197,7 839,5 221,4 795,1 247,8 749,4 277,4
9
4
WHS
272.2
25
750,7 112,0 720,9 128,2 689,6 145,5 657,0 164,2 623,1 184,8 588,3 207,6 552,4 233,1
9
WHS
254.2
20
4
9
WHS
235.2
ENTERING CONDENSER WATER TEMPERATURE °C
--
--
995,9 156,0 954,8 176,7 912,3 198,6 868,4 222,3 823,1 248,4 776,4 277,8
943,1 143,2 904,2 163,2 864,4 184,2 823,6 207,2 781,7 233,0 738,7 262,4 694,5 296,2
5
974,5 143,7 934,9 164,0 894,4 185,1 852,9 208,1 810,2 233,6 766,2 262,6 720,9 295,9
6
1006,5 144,2 966,4 164,7 925,1 186,0 882,8 208,9 839,2 234,3 794,3 263,0 748,0 295,8
7
1039,3 144,5 998,5 165,4 956,5 186,9 913,3 209,8 868,9 235,1 823,0 263,5 775,7 295,8
8
1072,8 144,8 1031,2 166,0 988,5 187,8 944,5 210,8 899,2 236,0 852,3 264,1 803,9 296,0
9
--
--
1064,7 166,6 1021,2 188,6 976,3 211,7 930,0 236,9 882,1 264,8 832,6 296,4
Note: (1) Nominal cooling capacity and power input are based on ∆T=5°C entering/leaving condenser water temperature; evaporator
fouling factor=0,0176 m2 °C/kW; condenser fouling factor=0,0440 m2 °C/kW.
805 B – 04/11 E – pag. 16/24
Evaporator pressure drop
Note: in case of pressure drop higher than 100 kPa, it is necessary to contact the factory.
805 B – 04/11 E – pag. 17/24
Condenser (2 passes) pressure drop
Note: in case of pressure drop higher than 100 kPa, it is necessary to contact the factory.
Note: in case of pressure drop less than 10 kPa it is necessary install a 4 passes condenser
805 B – 04/11 E – pag. 18/24
Condenser (4 passes) pressure drop
Note: in case of pressure drop higher than 100 kPa, it is necessary to contact the factory.
805 B – 04/11 E – pag. 19/24
805 B – 04/11 E – pag. 20/24
N.B. McQuay International reserves the right to make changes in design and construction at any time without notice
Dimensions WHS XE 098.1 ÷ 138.1
805 B – 04/11 E – pag. 21/24
N.B. McQuay International reserves the right to make changes in design and construction at any time without notice
Dimensions WHS XE 196.2 ÷ 272.2
WHS HF Frame 4 - Technical specifications
To supply and install, where specified in the project n ..... unit(s) water cooled chiller with cooling capacity of ..... kW, to cool
..... l/sec. of water from ..... °C to ....., condenser entering water temperature ….°C, condenser leaving water temperature
….°C. The unit should work with electricity at ..... V, 3ph, 50Hz. The electrical power absorbed should not exceed ..... kW.
The units COP will be at least ..... at the working conditions of the project. Part load COP will be at least ..... at the working
conditions of the project. For the units with 1, or 2 compressors the chillers will have (1), or (2) independent refrigerant
circuits, and the respective electronic microprocessor will allow the starting of the compressors. Each chiller will be factory
assembled on a robust baseframe. The unit will be tested at full load in the factory at the nominal working conditions and
water temperatures. Before shipment a full test will be held to avoid any losses, and the units will be filled with oil and
refrigerant.
Refrigerant - only HFC 134a will be accepted.
Noise level and vibrations – Sound pressure level at 1 meter distance in free field shall not exceed ………dBA
Vibration level should not exceed 2 mm/s.
Units will have the following components:
Compressors - The compressor should be single screw type with one main screw rotor that meshes with two diametrically
opposed gaterotors. The two exactly opposed gaterotors create two exactly opposed compression cycles which results in
balanced forces acting on the compressor. The gaterotors should be constructed of a carbon impregnated engineered
composite material. The gaterotor supports will be constructed of cast iron. The semi-hermetic compressor should be gascooled.
Oil injection shall be used for this compressor in order to get high COP at high condensing pressure. The unit should be
provided with an oil separator and it will be the high efficiency, augmented gas impingement type to maximise oil extraction.
Evaporator - The units will be supplied with one direct expansion evaporator with refrigerant inside the tubes and water
outside (shell side) with carbon steel tube sheets, with straight copper tubes that are spirally wound internally for higher
efficiencies, expanded on the tube plates. The external shell, will be linked with an electrical heater to prevent freezing to 28 C ambient temperature, commanded by a thermostat and will be covered with a closed cell insulation material. Each
evaporator will have 1, or 2 refrigerant circuits one for each compressor. Each evaporator is manufactured in accordance to
PED approval.
Condensers - Condensers will be shell and cleanable, through-tube type. The unit will have one condensers per circuit.
Each condenser shall have a carbon steel and seamless, integrally finned high efficiency copper tubes, roll expanded into
heavy carbon steel tube sheets. Water heads shall be removable and include vent and drain plugs. Condensers will come
complete with liquid shut-off valve, spring loaded relief valve.
Electronic expansion valve - Each refrigerant circuit will be equipped with all the necessary components in order to
ensure the workings and service (dehydration filter, liquid sight glass, shut-off valve, load connection, pressure switch etc.)
and an electronic expansion valve that allows a simple control system that quickly interacts at load variations. This valve
combines two functions: liquid solenoid and electronic expansion valve. It is managed directly by a microprocessor.
Control panel - Field power connection, control interlock terminals, and unit control system should be centrally located in
an electric panel (IP 43). Power and starting controls should be separate from safety and operating controls in different
compartments of the same panel. Starting will be star/delta type. Power and starting controls should include fuses and
contactors for each compressor winding. Operating and safety controls should include energy saving control; emergency
stop switch; overload protection for compressor motor; high and low pressure cut-out switch (for each refrigerant circuit);
anti-freeze thermostat; compressor lead-lag switch (on 2 compressor units only); cut-out switch for each compressor;
operating hour meter (for each compressor).
All of the information regarding the unit will be reported on a display and with the internal built-in calender and clock that will
switch the unit ON/OFF during day time all year long.
Regulation of cooling capacity - Each unit will have a microprocessor for the control and operation of the unit that should
have a infinitely variable capacity control down to 12,5% (two compressors), to 25% (one compressor) of the cooling
capacity.
Refrigerant piping - Refrigerant circuit should include a factory insulated suction line, manual liquid line shut-off valve with
charging connection, refrigerant filter drier with replaceable core, sensor indicator, electronic expansion valve and relief
valve.
805 B – 04/11 E – pag. 22/24
805 B – 04/11 E – pag. 23/24
We reserve the right to make changes in design and construction at any time without notice, thus the cover picture is not binding.
McQuay partecipa al programma di
Certificazione Eurovent.
I prodotti interessati figurano nella Guida
Eurovent dei Prodotti Certificati.
McQuay is participating in the Eurovent
Certification Programme
Product are as listed in the Eurovent
Directory of Certified Products
McQuay Italia S.P.A.
S.S. Nettunense, km 12+300 – 00040 Cecchina (Roma) Italia – Tel. (06) 937311 – Fax (06) 9374014 – E-mail: info @mcquayeurope. com
www .mcquayeurope. com
805 B – 04/11 E – pag. 24/24
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