Pacetti VT-G Operating instructions

VT_user manual-eng / rev.04 Page 1 –April 2015
V
V
VT
T
T-
-
-G
G
G /
/
/ V
V
VT
T
T-
-
-Z
Z
Z /
/
/ V
V
VT
T
T-
-
-X
X
X /
/
/ V
V
VT
T
TS
S
S /
/
/ V
V
VT
T
TP
P
P
Chilled water buffer vessels
USER AND MAINTENANCE
MANUAL
Cooke Industries - Phone: [phone] Fax: [phone] Email: [email protected] Web: www.cookeindustries.co.nz

VT_user manual-eng / rev.04 Page 2 –April 2015
VT_user manual-eng
Chilled water buffer vessels
V
V
VT
T
T-
-
-G
G
G /
/
/ V
V
VT
T
T-
-
-Z
Z
Z /
/
/ V
V
VT
T
T-
-
-X
X
X /
/
/ V
V
VT
T
TS
S
S /
/
/ V
V
VT
T
TP
P
P
Open buffer vessels
VT-G / VT-Z / VT-X
Buffer vessels with perforated central
divider plate / multiple flow dividers
VT-S / VT-P
Vessel
material
VT-G / VT-Z Mild carbon steel
VT-X Stainless steel 316
VTS / VTP Mild carbon steel
Inside
coating
VT-G None
VT-Z Dip hot galvanizing
VT-X Pickling
VTS / VTP None
Outside
coating
VT-G Anti rust primer
VT-Z Dip hot galvanizing
VT-X Pickling
VTS / VTP Anti rust primer
100 ÷1000 l
PVC
100 ÷1000 l
Aluminium
1500 ÷5000 l
PVC
Characteristics
STANDARD SUPPLY
UPON REQUEST
Capacity
100 ÷ 5000 litre
> 5000 litre
Version
Vertical
Horizontal (1)
Low / extra low
(2)
Connections
Threaded type
Flanged type
Insulation
VERTICAL
version
VT-G / VT-Z:
30 mm hard foam PU 100÷1000 l
20 mm closed cell elastomer 1500÷5000 l
VT-S / VT-P / VT-X:
20 mm closed cell elastomer 300÷5000 l
HORIZONTAL version
and
OUT OF STANDARD
VT-G / VT-Z / VT-X:
20 mm closed cell elastomer 100÷5000 l
Cladding
Coloured PVC with zipper fastening
Embossed aluminium 0.4 mm
VESSELS STANDARD WORKING
CONDITIONS
(3)
Model
Max
temperature
Max
pressure
Mild steel
vessels
-10°C/+50°C
≤ 1000 l
8 bar
≥ 1500 l
6 bar
Stainless steel
vessels
-10°C/+50°C
≤ 300 l
10 bar
500÷2500 l
8 bar
≥ 3000 l
6 bar
Connections
E-U
Inlet / Outlet
T
Thermometer
SD
Sensor
SF
Vent
S
Drain
D i m e n s i o ns
VERTICAL OPEN BUFFER VESSELS
VERTICAL BUFFER VESSELS
WITH PERFRORATED CENTRAL
DIVIDER PLATE
VERTICAL BUFFER VESSELS
WITH MULTIPLE
FLOW DIVIDERS
VT-G / VT-Z / VT-X
30 mm hard foam PU
insulation
100÷1000 l
VT-G / VT-Z / VT-X
20 mm closed cell
elastomer insulation
1500÷5000 l
VT-S
20 mm closed cell
elastomer insulation
300÷2000 l
VT-P
20 mm closed cell
elastomer insulation
300÷2000 l
Mild steel vessels
VT-G / VT-Z / VTS / VTP
Capacity
Dimensions (±5%) *
D
d
H
L
H1
Litre
mm
mm
mm
mm
mm
100
460
400
1070
940
590
200
510
450
1460
1340
640
300
610
550
1500
1390
800
500
710
650
1790
1690
890
800
860
800
1870
1770
1040
1000
860
800
2120
2020
1040
1500
1000
950
2430
2290
1180
2000
1150
1100
2480
2360
1330
2500
1250
1200
2560
2430
1480
3000
1300
1250
2760
2640
1540
4000
1450
1400
2840
2730
1680
5000
1650
1600
2930
2790
1870
Stainless steel vessels
VT-X
Capacity
Dimensions (±5%) *
D
d
H
L
H1
Litre
mm
mm
mm
mm
mm
100
460
400
1090
940
610
200
510
450
1480
1340
660
300
610
550
1520
1390
800
500
710
650
1810
1690
890
800
860
800
1890
1790
1040
1000
860
800
2140
2040
1040
1500
1050
1000
2180
2050
1240
2000
1250
1200
2250
2140
1430
2500
1250
1200
2580
2450
1480
3000
1300
1250
2780
2660
1540
4000
1450
1400
2860
2750
1680
5000
1650
1600
2950
2810
1870
HORIZONTAL OPEN BUFFER VESSELS
VT-G / VT-Z / VT-X
20 mm closed cell
elastomer insulation
100÷5000 l
* Dimensions may change in case of bespoke solutions
Cooke Industries - Phone: [phone] Fax: [phone] Email: [email protected] Web: www.cookeindustries.co.nz

VT_user manual-eng / rev.04 Page 3 –April 2015
VT_user manual-eng
CAPACITY
WEIGHT (*)
CONNECTIONS 
litres
kg
E-U
T / SD
SF / S
inches
inches
inches
100
25
1”¼
½”
1”¼
200
40
2”
½”
1”¼
300
50
2”½
½”
1”¼
500
70
3”
½”
1”¼
800
90
3”
½”
1”¼
1000
105
3”
½”
1”¼
1500
200
3”
½”
1”¼
2000
240
3”
½”
1”¼
2500
280
3”
½”
1”¼
3000
300
4”
½”
1”¼
4000
450
4”
½”
1”¼
5000
530
4”
½”
1”¼
(*) Indicative value, valid only for transportation and handling purposes
Description
The Pacetti VT series of chilled water vessels are utilised to store chilled water produced by an external chiller or chilled source.
There are 5 models with 2 of the models fitted with flow dividers or a perforated plate to avoid flow paths.
All models are provided as standard with threaded connections, but may be also equipped with flanged connections on request.
These chilled vessels are available both in black carbon or galvanized steel and stainless steel.
The black carbon steel tanks are used in case of indoor installation, therefore it is not required any kind of coating against corrosion.
The galvanized steel tanks can be also used in case of outdoor installation, when it is necessary to ensure corrosion and weather protection.
The stainless steel tanks are treated with pickling process and are suitable for indoor or outdoor installations.
All models can be manufactured in vertical or horizontal arrangement.
Protection coating against corrosion
HOT DIP GALVANIZING
This kind of coating is performed on carbon steel vessels by immersion of the tank in a molten zinc bath at 450°C according to UNI EN ISO 1461.
METAL PICKLING
It’s a metal surface treatment used to remove impurities after manufacturing processes. The tank is dipped into a solution called pickle liquor which contains strong acids able
to remove contaminants.
Thermal insulation against condensation
HARD FOAM POLYURETHANE
Hard foam polyurethane injected
Made of hard foam polyurethane 30mm thick, density of 40 to 42 kg/m3, average conductivity of 0.024 W/mK. CFC and HCFC free.
Closed cell elastomer foam
Made of closed cell elastomer foam sheets 20mm thick, density of 30 kg/m3, average conductivity of 0.034 W/mK. CFC and HCFC free.
Insulation
Tank capacity
Density
Thermal conductivity coefficient
Hard foam polyurethane injected 30 mm
100 ÷ 1000 l
40÷42 kg/m3
= 0,024 W/mK
Closed-cell elastomer foam 20 mm
1500 ÷ 5000 l
30 kg/m3
= 0,034 W/mK
External cladding is available in coloured PVC with zipper fastening or embossed aluminium 0.4mm thick for outdoor installations.
Operation
The Pacetti VT series of chilled water vessels are used in air conditioning and cooling systems when the water content of the plant is reduced. When installed between user and
chillers, these tanks can limit frequent compressor starts and allow a regular functioning of the plant at a constant temperature, avoiding timer intervention.
Models
The Pacetti VT series of chilled water vessels are available in different models:
VT-G Black carbon steel
VT-Z Galvanized steel
VT-X Stainless steel 316
VTS Black carbon steel with perforated central divider plate
VTP Black carbon steel with multiple flow dividers
Conformity
The Pacetti VT series of chilled water vessels are made with automatic welding processes.
All manufacturing processes are guaranteed by the Quality Management System of the Company, certified to ISO 9001.
All Pacetti products are subject to hydraulic tests at 1.5 * maximum working pressure and comply with the following standard:
European Pressure Equipment Directive 97/23/CE –Art.3.3 (pressure vessels) - excluded from CE mark.
Cooke Industries - Phone: [phone] Fax: [phone] Email: [email protected] Web: www.cookeindustries.co.nz

VT_user manual-eng / rev.04 Page 4 –April 2015
VT_user manual-eng
Chilled water buffer vessels
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INSTALLATION EXAMPLE
Closed circuit plant with chilled water storage tank installed on return
Description
A1
Heat pump /air conditioner (split system)
A2
Heat pump/air conditioner (monoblock)
B
External unit
C
Fan coil unit
D
Pump
E
Expansion vessel
F
Storage tank
Installation in a double circuit plant
Cooke Industries - Phone: [phone] Fax: [phone] Email: [email protected] Web: www.cookeindustries.co.nz

VT_user manual-eng / rev.04 Page 5 –April 2015
VT_user manual-eng
WARNINGS
This instruction manual is an essential part of the product and must be given to the final user.
Carefully read the suggestions contained in this manual, as they provide important information about installation, use and maintenance of the product.
Keep this manual for future reference.
The installation must be made in accordance with current regulations, according to the manufacturer's instructions and must be carried out by qualified
personnel only, in order to keep warranty valid.
A wrong installation can cause damages to people, animals and things.
The manufacturer will not be responsible for any damage caused by a wrong installation.
The use of the product for purposes other than those specified in this manual is forbidden.
The manufacturer will not be responsible for any damage caused by misuse, incorrect or unreasonable use.
The packaging must be disposed according to local regulations.
Disconnect the unit from any power source before carrying out any assistance or maintenance operation.
In case of malfunction should shut off the unit and ask for the intervention of the installer.
1.INSTALLATION
THIS OPERATION MUST BE MADE SOLELY BY QUALIFIED PERSONNEL, PENALTY THE LOSS OF WARRANTY.
1.1.FIRST CHECK
This vessel has been designed, manufactured and tested for the storage of chilled water within the limits of temperature and pressure indicated above and
on the id label applied on the product itself. Any use beyond the allowed limits should be considered dangerous and not suitable.
1.2.PLACEMENT
install the vessel as close as possible to the primary source
install the vessel on a flat surface of suitable strength, able to support the weight of the product once filled with water
check that there is enough space around the tank in order to perform future maintenance
verify that the room where the tank is placed has openings of a size to allow the free passage of the vessel, in case it's necessary to bring it out, in
order to avoid any demolition.
1.3.START
The connection diagram shown in this document is purely indicative and not binding. it's up to the designer of the system to give the best
connection scheme for the required application, in accordance either with the applicable regulations and with the limits imposed by the data
declared by the manufacturer.
provide the system of an expansion vessel including a relief valve (of counterweight or spring type) having a diameter not less than
where V is the volume in litre of the vessel, with a minimum of 15mm. The valve must be set at a pressure not exceeding the maximum working
pressure of the tank
make sure that the volume and the pre-charge pressure of the expansion vessel of the secondary circuit are suitable for the installation
in case impurities are contained in the water coming from mains, install a suitable filter
make sure that the pumps have enough flow and head and work correctly
make sure that the thermometer and thermostat sensors are positioned correctly
always perform the grounding of the tank
the insulation of the connecting pipes is always recommended in order to avoid unnecessary heat loss
The connection to the water mains must be done through a safety hydraulic kit including:
- 1 shut-off valve
- 1 check valve
- 1 safety valve
- 1 stop device of water supply
all the above accessories are necessary to make the tank installation safe from dangers
if the sanitary water system exceeds the maximum pressure allowed for the cylinder, install a pressure reducer as far away as possible from the
storage tank
1.4.OPERATION
the operation must be performed by qualified personnel
open a tap to let the air out while filling the vessel with water
Cooke Industries - Phone: [phone] Fax: [phone] Email: [email protected] Web: www.cookeindustries.co.nz

VT_user manual-eng / rev.04 Page 6 –April 2015
VT_user manual-eng
2.MAINTENANCE
Always disconnect the power supply before carrying out any operation on the unit
frequently check that all the regulation and control devices work correctly
2.1.EXPANSION VESSEL
frequently check the pre-charge pressure of the expansion vessel; the same value established during the system installation must be always
maintaned
restore the air cushion to the initial valued in order to ensure an efficient protection of the installation from overpressure
2.2.CLEANING
To clean the exterior of the vessel, use a cloth dampened with a proper cleaner
The use of abrasive, solvents, gasoline or alcohol is not recommended
3.DEFECTS AND FAILURES
PROBLEM
CAUSE
SOLUTION
Excessive pressure inside the tank
Expansion vessel lack or malfunctioning
The pressure of the expansion vessel air
cushion is not enough
Verify that the system is equipped with an expansion vessel.
If the expansion vessel is present, check that the precharge
pressure is set correctly (it must be restored to the initial
valued, slightly less than the one of the pressure reducer)
4.FINAL DISPOSAL
At the end of its life cycle, this product must not be treated as household waste.
The metallic components should be sold to operators authorized to the collection of materials for recycling.
The non-metallic components should be transferred to operators authorized to their disposal.
Cooke Industries - Phone: [phone] Fax: [phone] Email: [email protected] Web: www.cookeindustries.co.nz