AERMEC NRL F Series User manual
14_09. 5641250_01
INSTALLATION MANUAL
NRL free cooling
280-750
CHILLER
• EXTERNAL UNIT
• HIGH EFFICENCY
• POWER SUPPLY 60Hz
EN
60Hz
3
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AERMEC S.p.A. reserves the right at all times to make any modification for the improvement of its product and is not obliged to add these modification to machines of
previous manufacture that have already been delivered or are being built.
Dear Customer, Thank you for choosing an AERMEC product. This product is the result of many years of expe-
rience and in-depth engineering research, and it is built using top quality materials and advanced technologies.
In addition, the CE mark guarantees that our appliances fully comply with the requirements of the European
Machinery Directive in terms of safety. We constantly monitor the quality level of our products, and as a result
they are synonymous with Safety, Quality, and Reliability. Product data may be subject to modifications dee-
med necessary for improving the product without the obligation to give prior notice.
Thank you again.
AERMEC S.p.A
414_09. 5641250_01
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EN
INDEX
........................................................... 6
2. Check list .......................................................................................... 7
......................................................... 8
........................................ 8
... 9
.............................................................................. 10
....................................................................... 10
.................................................. 11
5.1. Minimum technical ......................................................................... 11
...................................................................................... 11
7. Dimension....................................................................................... 12
................................................................. 14
...................................................................... 16
......................................... 16
........................................ 16
............... 17
11. Hydraulic circuit .............................................................................. 19
................................................... 19
.................................................... 20
11.3. System load .................................................................................... 21
11.4. Emptying the system....................................................................... 21
12. Electrical wirings ............................................................................. 22
........................................ 22
............................................................ 23
....................... 23
................................................................. 24
....................................................... 24
............................................... 24
14.3. Season changeover ......................................................................... 24
............................................................. 25
15.1. Cooling set point............................................................................. 25
............................................................................. 25
15.3. Compressor start delay ................................................................... 25
............................................................................. 25
............................................................................ 25
..................................................................... 25
16. Regular maintenance ...................................................................... 25
17. Extraordinary maintenance............................................................. 25
5
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chillers equipped with an external air cooling capacity
recovery system called "free-cooling".
The water free-cooling system consists in integrating
and eventually completely replacing the cooling capaci-
ty delivered by the compressors through an additional
water coil that exploits the low temperature of the
external air to cool the system's return water.
Maximum reliability
The presence of several scroll compressors allows NRL
chillers various partialisations of the cooling capacity.
OPERATING MODE:
FREE-COOLING ONLY:
when the external temperature is sufficiently low to
allow water cooling inside the free-cooling coils at
the desired temperature. This is the most economical
mode of the unit with only the fans operating in speed
modulation.
MIXED FREE-COOLING + COMPRESSORS:
the compressors operate in integration with the free-
cooling when the cooling capacity recovered from the
external air is no longer sufficient for the power requi-
red by the system. The higher the cooling capacity
recovery with free-cooling the lower the integration is.
COMPRESSORS ONLY:
when the external air temperature is greater than the
return temperature of the system water.
Models:
1. NRL "F" free-cooling
The versions can be in different set-ups at the same
time in order to satisfy a wide range of plant enginee-
ring solutions:
1. "A" HIGH EFFICIENCY
2. "E" SILENCED HIGH EFFICIENCY
3. "D" WITH DESUPERHEATER
The units with desuperheater (D) are not available in
the versions:
1. YD
2. XD
1. DESCRIPTION AND CHOCE OF UNIT
Standards and Directives respected on
designing and constructing the unit:
PROTECTION RATING
1. IP 24
ACOUSTIC PART:
1.
2.
3. SOUND PRESSURE
REFRIGERANT GAS:
This unit contains fluoride gases with
greenhouse effect covered by the
Kyoto Protocol. Maintenance and
disposal must only be performed by
qualified staff.
STANDARD:
UL 1995
Heating and cooling equipment.
ANSI/NFPA
Standard 70 National Electrical code
CSA C.22.1.- C.22.2
Safety Standard Electrical Installation.
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2. CHECK LIST
"F" VERSION
Hydraulic circuit Version "F 00" 0280 0300 0330 0350 0500 0550 0600 0650 0700 0750
Water filter yes yes yes yes yes yes yes yes yes yes
yes yes yes yes yes yes yes yes yes yes
Air vent yes yes yes yes yes yes yes yes yes yes
Hydraulic circuit
Version "P1…P4"
0280 0300 0330 0350 0500 0550 0600 0650 0700 0750
Water filter yes yes yes yes yes yes yes yes yes yes
yes yes yes yes yes yes yes yes yes yes
Safety valve yes yes yes yes yes yes yes yes yes yes
Air vent yes yes yes yes yes yes yes yes yes yes
Pump yes yes yes yes yes yes yes yes yes yes
Expansion tank yes yes yes yes yes yes yes yes yes yes
Hydraulic circuit Version "01…04" 0280 0300 0330 0350 0500 0550 0600 0650 0700 0750
Water filter yes yes yes yes yes yes yes yes yes yes
yes yes yes yes yes yes yes yes yes yes
Safety valve yes yes yes yes yes yes yes yes yes yes
Air vent yes yes yes yes yes yes yes yes yes yes
Pump yes yes yes yes yes yes yes yes yes yes
Expansion tank yes yes yes yes yes yes yes yes yes yes
Storage tank yes yes yes yes yes yes yes yes yes yes
Ciruit Components
Cooling circuit Model F B with D
Resistance carter compressor yes yes yes
High pressure switch yes yes yes
Low pressure switch no no no
High pressure trasducer yes yes yes
Low pressure trasducer yes yes yes
Solenoid valve of hot gas injecton yes yes yes
By-pass valve of hot gas no no yes
yes yes yes
no yes yes
no yes
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3. PRINCIPLE OF OPERATION SCHEMES
CN
CN
CN
CPCP
TEV
TEV
BHE
V3V
3.1. PRODUCTION OF COLD WATER ONLY THE SYSTEM
Description Operation
1exchanger
SYSTEM SIDE
Production cold water
2exchanger
SOURCE SIDE
Heat exchange with the air
3exchanger
SYSTEM SIDE
Production cold water
H2O RETURN
SYSTEM
H2O DISCHARGE
SYSTEM
1
2
3
2Sign Description
CP compressor
CN Air side exchange
TEV Thermostatic valve
BHE Exchanger plate
V3V three-way valve
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4. OPERATING LIMITS
Note:
1 - In summer mode the unit can be started
-
way valve that allows bypassing water from the
limits are achieved.
The devices in their standard configurations are not
suitable for installation in salty environments.
the operating limits, refer to diagram, valid for AHRI
standard conditions.
Wind breaks should be implemented if the unit is
installed in particularly windy areas, to prevent a
malfunction of the unit.
4.1.
ATTENTION
Contact our technical sales depart-
ment if the unit needs to operated
outside the operating limits.
ATTENTION
When the unit is installed in particularly
windy areas, we recommend installing
REFRIGERANT SIDE High pressure
side
Low pressure
side
Acceptable maximum pressure
Acceptable maximum temperature
Acceptable minimum temperature
WATER SIDE
Acceptable maximum pressure
Hydarulic circuit safety valve
(only in version with storage tank or with pump)
by discharging overpressure if abnormal work pressure occur.
External air temperature b.s.
5
14
23
32
41
50
59
68
77
86
95
104
113 114,8 °F
46 °C
36 °C
96,8 °F
122
-15
-10
-5
0
5
10
15
20
25
30
35
40
45
50
°C
°C
°F
°F
-6
-7
-8
-5
-4
-3
-2
-1
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
17,6
19,4
21,2
23,0
24,8
26,6
28,4
30,2
32,0
33,8
35,6
37,4
39,2
41,0
42,8
44,6
46,4
48,2
50,0
51,8
53,6
55,4
57,2
59,0
60,8
62,6
64,4
66,2
68,0
STANDARD
functioning
Functioning only with "I" funs
Functioning with
glycoled water
Functioning only with "I"
funs
+
water glycoled
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The support surface must be capable of
supporting the unit weight.
The safety differences between the unit
and other appliances or structures must
be scrupulously respected so that the inlet
and outlet air from the fans is free to circu-
late.
The unit must be installed by an enabled
technician in compliance with the national
legislation in force in the country of desti-
nation, respecting the minimum technical
spaces in order to allow maintenance.
The machine is delivered from the factory wrapped
in estincoil. Before handling the unit, verify the
lifting capacity of the machines used. After removal
of packaging, movement of apparatus must be
carried out by qualified and adequately equipped
personnel.
The unit must be installed by a quali-
fied and suitably trained technician,
in compliance with the national
legislation in force in the country
AERMEC will not assume any respon-
sibility for damage due to failure to
follow these instructions.
Before beginning any operation,
READ THESE INSTRUCTIONS CARE-
staff involved must have thorough
knowledge of the operations and
any dangers that may arise at the
moment in which the installation
operations are carried out.
5. SELECTION AND PLACE OF
INSTALLATION
1100 mm
43 in
800 mm
31 in
800 mm
31 in
800 mm
31 in
3000 mm
118 in
ATTENTION:
The drawings are only examples.
EXAMPLE
2
"OF THE LIFTING"
Before moving the unit, check the lifting
capacity of the machines used.
Once the packaging has been
removed, the unit must
be handled by qualified per-
sonnel, using the appropriate
equipment.
To handle the machine:
hook the lifting cables to the
special eyebolts In order to
avoid damaging the unit with
the cables, insert protection
elements between them and
the machine. Is it absolutely
forbidden to stand beneath
the unit.
ATTENTION
Always use all the provided eyebolts.
ATTENTION
con carri elevatori e cinghie preve-
EXAMPLE 1
"OF THE LIFTING"
holes on the base with length such
to allow positioning of the belts
used for lifting.
To prevent the unit structure
being damaged by the belts place
protections between the latter and
the machine.
It is prohibited to stop under the
unit.
NOTE:
The appliance warranty does not cover the costs for lad-
ders, scaffolding, or other elevation systems that may
become necessary for carrying out servicing under
warranty.
5.1. MINIMUM TECHNICAL
6. POSITIONING
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7. DIMENSION
7.1. NRL 0280 - 0300 FE
1606 mm
63 in
1750 mm
69 in
1100 mm
43 in
2950 mm
116 in 3010 mm
119 in
1160 mm
46 in
1606 mm
63 in
1100 mm
43 in
2950 mm
116 in
1750 mm
69 in
3010 mm
119 in
1160 mm
46 in
7.2. NRL 0330 - 0350 FE
7.3. NRL 0500 - 0550 FA
3200 mm
126 in
1100 mm
43 in
1875 mm
74 in
3260 mm
128 in
1160 mm
46 in
2035 mm
80 in
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7.4. NRL 0600 - 0650 - 0700 FA
7.5. NRL 0750 / 0750 FA
1990 mm
78 in
3950 mm
156 in
4010 mm
158 in
1100 mm
43 in
1160 mm
46 in
1875 mm
74 in
1955 mm
77 in
1500 mm
59 in
4350 mm
171 in ATTENTION:
NRL 0750 FA ALWAYS USE ALL THE
PROVIDED EYEBOLTS.
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8. ANTIVIBRATION POSITIONING
200 mm
8 in
200 mm
8 in
200 mm
8 in
200 mm
8 in
1275 mm
50 in
1275 mm
50 in
1275 mm
50 in
1275 mm
50 in
200 mm
8 in
1400 mm
55 in
1400 mm
55 in
200 mm
8 in
200 mm
8 in
1400 mm
55 in
1400 mm
55 in
200 mm
8 in
8.1. NRL 0280 - 0300 - 330 - 350 FE
8.2. NRL 0500 - 0550 FE FA
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8.3. NRL 0600 - 0650 - 0700 FA
8.4. NRL 0750 FA
2100 mm
83 in
2100 mm
83 in
1450 mm
57 in
1450 mm
57 in
200 mm
8 in
200 mm
8 in
200 mm
8 in
200 mm
8 in
100 mm
4 in
100 mm
4 in
100 mm
4 in
100 mm
4 in
1500 mm
59 in
1500 mm
59 in
1500 mm
59 in
1500 mm
59 in
1150 mm
45 in
1150 mm
45 in
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9. HYDRAULIC CONNECTION
9.1. HYDRAULIC CONNECTION NRL 0280-0350 FA
248
548
428
340
OUT
IN
438
303
711
504
OUT
IN
9.2. HYDRAULIC CONNECTION NRL 0500 - 0750 FA
WARNING:
unit. Cleaning will eliminate any residues suck as
from the piping. These substances could deposit
-
ported so as not to burden the apparatus with
their weight.
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Gy
Gx
13
24
10. DISTRIBUTION OF PERCENTAGE WEIGHTS ON SUPPORTINGPOINTS
TOP VIEW
WEIGHT OF EMPTY UNITS
NRL TYPE WEIGHT
(lib)
CENTER OF
GRAVITY
PERCENTAGE OF WEIGHT
DISTRIBUTION SUPPORTS (%) KIT
VT
Gx mm Gx
in
Gy
mm
Gy
in 1234
00 1847 556 219 1312 517 23% 25% 24% 27%
04 2255 555 219 1395 549 22% 24% 26% 29%
03 2178 555 219 1368 539 22% 24% 26% 28%
P4 2001 556 219 1376 542 22% 24% 26% 28%
P3 1924 556 219 1346 530 22% 25% 25% 28%
00 2001 556 219 1345 530 22% 25% 25% 28%
04 2409 555 219 1417 558 21% 23% 26% 29%
03 2332 555 219 1393 548 22% 24% 26% 29%
P4 2156 556 219 1403 552 21% 24% 26% 29%
P3 2078 556 219 1375 541 22% 24% 26% 28%
00 2036 556 219 1347 530 22% 25% 25% 28%
04 2444 555 219 1417 558 21% 23% 26% 29%
03 2367 555 219 1393 549 22% 24% 26% 29%
P4 2191 556 219 1403 552 21% 24% 26% 29%
P3 2114 556 219 1376 542 22% 24% 26% 28%
00 2065 557 219 1333 525 23% 25% 25% 27%
04 2473 556 219 1405 553 21% 24% 26% 29%
03 2396 556 219 1381 544 22% 24% 26% 28%
P4 2219 556 219 1390 547 22% 24% 26% 29%
P3 2142 556 219 1362 536 22% 24% 25% 28%
00 2449 538 212 1409 555 27% 26% 24% 23%
04 2907 540 213 1660 653 30% 28% 21% 21%
03 2821 540 212 1624 639 30% 29% 21% 20%
P4 2621 539 212 1628 641 30% 29% 21% 20%
P3 2535 538 212 1588 625 31% 29% 21% 20%
00 2466 536 211 1401 552 27% 26% 24% 23%
04 2925 538 212 1651 650 30% 28% 21% 20%
03 2839 538 212 1616 636 30% 29% 21% 20%
P4 2638 537 211 1620 638 30% 29% 21% 20%
P3 2552 537 211 1579 622 31% 29% 20% 19%
WEIGHT OF RUNNING UNITS
NRL TYPE WEIGHT
(lib)
CENTER OF
GRAVITY
PERCENTAGE OF WEIGHT
DISTRIBUTION SUPPORTS (%) KIT
VT
Gx mm Gx
in
Gy
mm
Gy
in 1234
00 1946 550 217 1338 527 23% 25% 25% 27%
04 3015 550 217 1441 567 21% 23% 27% 29%
03 2938 547 215 1422 560 21% 23% 27% 29%
P4 2100 546 215 1397 550 22% 23% 27% 28%
P3 2023 546 215 1369 539 22% 24% 26% 28%
00 2103 550 217 1368 538 22% 24% 26% 28%
04 3172 550 217 1455 573 21% 22% 27% 30%
03 3094 547 215 1438 566 21% 23% 27% 29%
P4 2257 546 215 1421 559 21% 23% 27% 29%
P3 2180 546 215 1395 549 22% 23% 27% 28%
00 2138 551 217 1369 539 22% 24% 26% 28%
04 3207 551 217 1455 573 21% 22% 27% 30%
03 3130 551 217 1438 566 21% 23% 27% 29%
P4 2292 551 217 1421 559 21% 23% 27% 29%
P3 2215 551 217 1396 550 22% 24% 26% 28%
00 2167 551 217 1355 534 22% 24% 26% 28%
04 3235 551 217 1445 569 21% 23% 27% 29%
03 3158 551 217 1428 562 21% 23% 27% 29%
P4 2321 551 217 1408 554 21% 23% 27% 29%
P3 2244 551 217 1383 544 22% 24% 26% 28%
00 2605 533 210 1442 568 26% 25% 25% 24%
04 4166 540 212 1746 688 28% 27% 23% 22%
03 4080 539 212 1724 679 29% 28% 22% 21%
P4 2777 534 210 1647 648 30% 28% 21% 20%
P3 2691 534 210 1610 634 31% 29% 21% 20%
00 2623 531 209 1435 565 27% 25% 25% 23%
04 4183 538 212 1740 685 29% 27% 22% 22%
03 4097 538 212 1718 676 29% 28% 22% 21%
P4 2795 533 210 1639 645 30% 28% 21% 20%
P3 2709 532 209 1601 630 31% 29% 21% 20%
17
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WEIGHT OF EMPTY UNITS
NRL TYPE
WEIGHT
(lib)
CENTER OF
GRAVITY
PERCENTAGE OF WEIGHT
DISTRIBUTION SUPPORTS (%) KIT
VT
Gx mm Gx in Gy mm Gy in 1 2 3 4 5 6 7 8
00 3945 754 297 2069 815 8,2% 8,3% 12,7% 12,9% 26,0% 26,3% 2,7% 2,8%
04 4430 670 264 1837 723 9,1% 7,4% 14,2% 11,4% 29,0% 23,4% 3,1% 2,5%
03 4342 686 270 1882 741 9,0% 7,5% 13,9% 11,7% 28,4% 23,9% 3,0% 2,5%
P4 4144 716 282 1964 773 8,6% 7,9% 13,4% 12,2% 27,4% 25,0% 2,9% 2,6%
P3 4055 734 289 2015 793 8,4% 8,1% 13,1% 12,5% 26,7% 25,6% 2,8% 2,7%
WEIGHT OF RUNNING UNITS
NRL TYPE
WEIGHT
(lib)
CENTER OF
GRAVITY
PERCENTAGE OF WEIGHT
DISTRIBUTION SUPPORTS (%) KIT
VT
Gx mm Gx in Gy mm Gy in 12345678
00 4188 747 294 2105 829 8,0% 7,9% 12,4% 12,3% 27,1% 26,9% 2,7% 2,7%
04 5797 540 213 1523 599 10,2% 5,7% 15,8% 8,9% 34,5% 19,4% 3,5% 2,0%
03 5686 550 217 1551 611 10,1% 5,8% 15,6% 9,1% 34,2% 19,8% 3,4% 2,0%
P4 4408 711 280 2003 789 8,4% 7,6% 13,0% 11,7% 28,4% 25,6% 2,9% 2,6%
P3 4298 728 287 2053 808 8,2% 7,7% 12,7% 12,0% 27,8% 26,2% 2,8% 2,6%
Gy
Gx
1
2
3
4
5
6
TOP VIEW
Gy
Gx
1
2
3
4
5
6
7
8
TOP VIEW
WEIGHT OF EMPTY UNITS
NRL TYPE WEIGHT
(lib)
CENTER OF
GRAVITY
PERCENTAGE OF WEIGHT
DISTRIBUTION SUPPORTS
(%) KIT
VT
Gx mm Gx
in
Gy
mm
Gy
in 123456
00 3019 552 217 1701 670 8,0% 8,0% 32,8% 33,0% 9,1% 9,1%
04 3526 474 187 1461 575 9,1% 6,9% 37,4% 28,4% 10,4% 7,9%
03 3416 489 193 1506 593 8,9% 7,1% 36,6% 29,3% 10,1% 8,1%
P4 3240 516 203 1590 626 8,5% 7,5% 34,9% 30,9% 9,7% 8,5%
P3 3130 534 210 1644 647 8,2% 7,8% 33,9% 31,9% 9,4% 8,8%
00 3196 550 217 1723 679 7,7% 7,7% 33,0% 33,1% 9,2% 9,2%
04 3703 476 187 1491 587 8,8% 6,7% 37,5% 28,6% 10,4% 8,0%
03 3593 490 193 1535 604 8,6% 6,9% 36,6% 29,5% 10,2% 8,2%
P4 3416 516 203 1616 636 8,2% 7,3% 35,1% 31,0% 9,8% 8,6%
P3 3306 533 210 1668 657 8,0% 7,5% 34,1% 32,0% 9,5% 8,9%
00 3240 552 217 1713 674 7,9% 7,9% 32,8% 33,1% 9,1% 9,2%
04 3725 479 188 1484 584 8,9% 6,9% 37,2% 28,7% 10,3% 8,0%
03 3615 493 194 1528 601 8,7% 7,1% 36,4% 29,5% 10,1% 8,2%
P4 3438 518 204 1608 633 8,3% 7,4% 34,9% 31,1% 9,7% 8,6%
P3 3328 535 211 1659 653 8,1% 7,7% 33,9% 32,1% 9,4% 8,9%
WEIGHT OF RUNNING UNITS
NRL TYPE WEIGHT
(lib)
CENTER OF
GRAVITY
PERCENTAGE OF WEIGHT
DISTRIBUTION SUPPORTS
(%) KIT
VT
Gx mm Gx
in
Gy
mm
Gy
in 123456
00 3196 548 216 1737 684 7,5% 7,5% 33,3% 33,1% 9,3% 9,2%
04 4342 402 158 1274 502 9,5% 5,5% 42,2% 24,3% 11,8% 6,8%
03 4254 412 162 1306 514 9,4% 5,6% 41,6% 24,9% 11,6% 6,9%
P4 3394 514 202 1629 641 8,0% 7,0% 35,4% 31,0% 9,9% 8,7%
P3 3306 530 209 1681 662 7,8% 7,2% 34,4% 32,0% 9,6% 8,9%
00 3416 546 215 1768 696 7,2% 7,1% 33,7% 33,2% 9,5% 9,4%
04 4584 408 161 1321 520 8,9% 5,3% 42,1% 24,8% 11,9% 7,0%
03 4474 418 164 1352 532 8,8% 5,4% 41,5% 25,4% 11,7% 7,2%
P4 3637 514 203 1665 656 7,6% 6,7% 35,6% 31,3% 10,0% 8,8%
P3 3526 530 209 1715 675 7,4% 6,9% 34,7% 32,2% 9,8% 9,1%
00 3460 548 216 1758 692 7,3% 7,2% 33,5% 33,3% 9,4% 9,3%
04 4628 411 162 1317 518 9,1% 5,4% 41,8% 24,9% 11,7% 7,0%
03 4518 420 165 1348 531 9,0% 5,6% 41,3% 25,5% 11,6% 7,1%
P4 3681 517 203 1657 652 7,7% 6,8% 35,4% 31,3% 9,9% 8,8%
P3 3570 532 209 1706 672 7,5% 7,0% 34,5% 32,3% 9,7% 9,0%
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STANDARD COMPONENT
1
Exchanger plate
2
3
Water filter
4
Ball stop
5
6
7
3-way valve
8
Pump
9
Expansion tank
10
Ball stop drain
RECOMMENDED COMPONENTS NOT SUPPLIED
(CHARGED TO THE INSTALLER)
11
Anti-vibration couplings
12
Ball stop
13
Safety valve
14
Charging unit
15
Manometer
16
Storage tank
17
Storage tank ball stop drain
1
2
34 4
5
7
11
11
10
14
8
12
12
4
69
13
15
17
6
16
9
hydraulic components NRL P3-P4 hydraulic components NOT SUPPLIED
ATTENTION
The choice and the installation of
components external to the NRL
up to the installer, who must ope-
rate according to the rules of good
technical design and in compliance
with the regulations in force in the
country of destination.
ATTENTION
The hydraulic pipes connecting to
the machine must be properly si-
-
quired by the system in operation.
The water flow to the exchanger
must always be constant.
ATTENTION
Carefully wash the plant, before
connecting the unit. This allows
cleaning to remove any residue
such as weld spatter, slag, rust or
other impurities from the pipes.
These substances may otherwise
accumulate in and cause a machi-
ne malfunction. The connecting
pipes should be supported so as
not to weigh, with their weight on
the unit.
ATTENTION
The hydraulic parallel is in charge
of the installer.
NOTE
The drawings are only examples
of the hydraulic circuit.
PH 6-8
Electric conductivity
Chloride ions less than 50 ppm
Sulphuric acid ions less than 50 ppm
Total iron less than 0.3 ppm
Alkalinity M less than 50 ppm
Total hardness less than 50 ppm
Sulphur ions none
ammonia ions none
Silicone ions less than 30 ppm
11. HYDRAULIC CIRCUIT
11.1. HYDRAULIC CIRCUIT (VERSIONS P3-P4)
19
14_09. 5641250_01
NRL free cooling 0280-0750 60Hz
EN
11.2. HYDRAULIC CIRCUIT (VERSIONS 03-04)
STANDARD COMPONENT
1
Exchanger plate
2
3
Water filter
4
Ball stop
5
6
7
3-way valve
8
Pump
9
Expansion tank
10
Safety valve
11
Storage tank
12
Storage tank ball stop drain
13
Ball stop drain
RECOMMENDED COMPONENTS NOT SUPPLIED
(CHARGED TO THE INSTALLER)
14
Anti-vibration couplings
15
Ball stop
16
Charging unit
17
Manometer
6
1
2
34 4
5
6
7
10
13
15
16 17
814
14
4
11
15
12
9
hydraulic components NRL 03-04 hydraulic components NOT SUPPLIED
PH 6-8
Electric conductivity
Chloride ions less than 50 ppm
Sulphuric acid ions less than 50 ppm
Total iron less than 0.3 ppm
Alkalinity M less than 50 ppm
Total hardness less than 50 ppm
Sulphur ions none
ammonia ions none
Silicone ions less than 30 ppm
ATTENTION
The choice and the installation of
components external to the NRL
up to the installer, who must ope-
rate according to the rules of good
technical design and in compliance
with the regulations in force in the
country of destination.
ATTENTION
The hydraulic pipes connecting to
the machine must be properly si-
-
quired by the system in operation.
The water flow to the exchanger
must always be constant.
ATTENTION
Carefully wash the plant, before
connecting the unit. This allows
cleaning to remove any residue
such as weld spatter, slag, rust or
other impurities from the pipes.
These substances may otherwise
accumulate in and cause a machi-
ne malfunction. The connecting
pipes should be supported so as
not to weigh, with their weight on
the unit.
ATTENTION
The hydraulic parallel is in charge
of the installer.
NOTE
The drawings are only examples
of the hydraulic circuit.
20 14_09. 5641250_01
NRL free cooling 0280-0750 60Hz
EN
11.3. SYSTEM LOAD
drain tap is closed.
Open all the drain valves of the system and of the
related terminals.
system load cock placed outside the machine.
read on the gauge the value of 1.5 bar.
The system is loaded at a pressure between 1 and 2
bar. It is advisable to repeat this operation once the
machine has worked for some hours and to periodically
check the system pressure, restoring if it drops below 1
bar.Check the hydraulic seal of the joints.
11.4. EMPTYING THE SYSTEM
unit
closed
Open the drain tap outside the machine and all
the vent valves of the system and the correspon-
ding terminals.
If the system uses glycol, this liquid should not be drai-
ned to the environment because it is a pollutant.
It must be collected and, if possible, reused.
ATTENTION
In case of version with pumping
unit, without standby pump, it is
recommended to install unidirec-
tional valves to the delivery of each
module.
So water reflow is avoided
from the other circuit.
It is necessary, that the water flow
rate to the chiller unit complies with
the values reported in the perfor-
mance tables.
or specific regulations, need the
water backflow system.
-
ried out with appropriate treatment
systems.
This manual suits for next models
12
Table of contents
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