Nibe UKV 20-40 User manual

26.07.2017
26532
Installation and Operating Manual
Buffer tanks
UKV 20-40
UKV 20-100
Installation and Operating Manual

All installation diagrams in this manual do not replace the system design; they can only be used for illustrative purposes. The
product is not intended for use by persons with reduced physical tness/mental efciency or without sufcient experience and
knowledge, if they are not supervised or instructed by a person responsible for their safety. Operation of the product by children
is strictly prohibited.
We reserve the right to make the product design changes and changes in the manual.
©NIBE 2017

3Content |Buffer tanks
UKV 20-40, UKV 20-100
Content
1 General ____________________4
Introduction_____________________________ 4
Intended Use ___________________________ 4
2 Design _____________________5
3 Installation__________________6
Location of the Tank______________________ 6
Installation Requirements__________________ 6
Installation of the Temperatur Sensor_________ 7
Installation of electric heating module ________ 8
Warnings and Practical Recommendations ____ 8
4 Service_____________________9
5 Recycling and disposal _______9
6 Technical data______________10
Dimensions____________________________ 10

4General Buffer tanks
UKV 20-40, UKV 20-100
Chapter 1 |
1 General
Introduction
Thank you for your confi dence and choice of equip-
ment by NIBE. To fully benefi t from the advantages of
this product, please read this Manual before using it,
and in particular chapters relating to the application,
installation and maintenance, and warranty. Please
keep this Manual in a safe place for future reference.
Intended Use
Buffer tanks are used for storage and transfer of ener-
gy contained in the heating medium. The main task of
the buffer tanks with capacities of 40 L and 100 L is
to increase capacity of the heating circuit. In addition,
the 100 L tank is a hydraulic coupler is in the heating
system. The accumulated energy is transferred to the
heating system. Buffer tanks can operate with a va-
riety of heat sources in central heating systems such
as heat pumps, solid fuel boilers, solar heating sys-
tems, etc.When used in the system containing a solid
fuel-fi red boiler, the low capacity tank improves the
uniform heat removal. It reduces the amount of fi re
ups and additionally enables the boiler operation at
the design power rating. This also enhances the effi -
ciency and life of the boiler.
When operating with a heat pump, the buffer tank task
is to increase the capacity of the heating system. The
use of buffer limits the number of compressor star-
t-ups, which extends its life. NIBE buffer tanks ena-
ble operation with virtually any type of central heating
system. During the installation and operation, always
follow the instructions in this Manual.
Fig. 1 UKV 20-40 buffer tank.
Fig. 2 UKV 20-100 buffer tank.
Sections of the Manual relating to the instal-
lation, inspection and maintenance are inten-
ded for the qualifi ed installer.
CAUTION
The manufacturer shall not be held liable for
any damages caused by failure to comply
with the recommendations and observations
contained in this Manual.
CAUTION
Buffer tanks are designed for heating up and
supplying the heating medium. Any inap-
propriate use, not in compliance with its
intended use is not permitted. Neither ma-
nufacturer nor supplier shall be responsible
for damages resulting from this.
CAUTION

5Chapter 2 | DesignBuffer tanks
UKV 20-40, UKV 20-100
2 Design
Fig. 3 Section of the UKV 20-40 buffer tank Fig. 5 Upper view of the UKV 20-40 buffer tank
Fig. 4 Section of the UKV 20-100 buffer tank
UKV Buffer tanks by NIBE are made of high quality
steel sheet, coated on the outside with anti-corrosion
paint. Specially selected tank insulation provides ex-
cellent thermal insulation properties of these devices.
All devices in the Series are in aesthetic plastic body.
Tanks have connector pipes and temperature sen-
sor cover for mounting the sensor and temperature
measurement at different levels in the tank, as well
as connectors for mounting an electrical heating unit.
1
1
1
1
1
1
1
1
2
2
8
3
3
44
4
5
5
7
6
DESCRIPTION:
1. Connector pipe
2. Tank insulation.
3. Steel tank.
4. Bracket.
5. Screw.
6. Cover.
7. Temperature sensor cover.
8. Heating element connector.
Fig. 6 Upper view of the UKV 20-100 buffer tank

6Installation Buffer tanks
UKV 20-40, UKV 20-100
Chapter 3 |
1
22
22
3
4
Installation Requirements
Buffer tanks of UKV Series should be installed in a
dry area, protected against temperatures below 0°C
(e.g. in the basement, boiler room, etc.). Location and
manner of installation must ensure trouble-free main-
tenance and servicing of the unit in the future.
To suspend the unit, use the auxiliary brackets at-
tached to the product. With ø12 dowels and ø8 screws
(included), secure the brackets horizontally to a suita-
bly hard wall, i.e. made of concrete, solid bricks, etc.
When suspending on the walls of lower carrying ca-
pacity, e.g. made of gypsum, hollow bricks, etc., use
a different kind of dowels and screws to ensure stable
mounting of the unit. After mounting the bracket, hang
the unit on the main bracket.
The manufacturer shall not be liable for damages re-
sulting from improper installation of the tank.
Buffer tanks Series UKV can be connected to open or
closed central heating systems. Pressure in the C/H
system may not exceed the max operating tempera-
ture of the unit (for the allowable operating parame-
ters of the units, see Table 2 Technical data.) Connect
the buffer tank in accordance with the installation
3 Installation
Location of the Tank
Open System
Closed System
Fig. 7 Mounting the unit on the hanger.
diagram. Remember to install the appropriate safety
valves.
UKV buffer tanks can be included in an open C/H sys-
tem protected in accordance with actual norms or
standards of protection.
Buffer tanks Series UKV can be connected to a closed
C/H system in accordance with relevant regulations
and standards.
Buffer tank operating in a closed circuit must be
equipped with correctly dimensioned safety valve
(preferably in the heating medium return line to the
heating source), with blow-off pressure not exceeding
the max operating pressure of the unit (for the max
operating pressures of the units, see Table 1 Techni-
cal data.) Some amount of the heating medium can
leak from the safety valve during normal operation,
therefore, you should install a drain line in the safety
valve, allowing safe drain of the heating medium to
the sewerage or drain grate. Safety valve drain line
should be installed with a decline, in an environment
free of freezing and remain open to the atmosphere.
NIBE is not responsible for fl ooding the room through
the safety valve.
supply from
the heat
source
return to the
heat source
heating
system
supply
return from the
heating system
to sewerage
Fig. 8 Diagram of the UKV 20-100 buffer tank installa-
tion in an open system
DESCRIPTION:
1. Buffer tank
2. Cut-off valve
3. Drain valve
4. Opened Expansion tank
Installation and commissioning of the buffer
tank shall only be done by appropriately qu-
alifi ed installer. The installer should inform the
user of the functions of the product and provi-
de the necessary information on its safe use.
CAUTION

7Chapter 3 | InstallationBuffer tanks
UKV 20-40, UKV 20-100
Installation of the Temperature
Sensor (only UKV 20-100)
Fig.9 Diagram of the UKV 20-100 buffer tank installa-
tion in a closed system.
supply from
the heat
source
return to the
heat source
return from the
heating system
heating
system
supply
to sewerage
DESCRIPTION:
1. Buffer tank
2. Cut-off valve
3. Drain valve
4. Safety valve
5. Expansion vessel
UKV 20-100 buffer tanks have enclosure for the tem-
perture sensor. In order to install the temperature
sensor (Fig. 10):
1. Remove the screws securing the enclosure co-
ver. (1)
2. Remove the enclosure cover together with ther-
mal insulation. (1)
3. Drill a hole in the cover to enable insertion of the
temperature sensor. (2)
4. Insert the sensor through the cover, and into the
temperature sensor cover. (3)
5. Reinstall the enclosure cover together with ther-
mal insulation.
1
22
2 2
3
4
5
When connecting the buffer tank to a closed C/H
system, you have to install an additional or incre-
ase capacity of the existing expansion vessel.
TIP
The lower return connections to the heating
source and from the heating system can be
connected in opposite confi guration.
TIP
We recommend connecting the tank connector
pipes with the system lines by means of unions
to allow disconnection of the tank, if required.
TIP
In closed systems, use of a safety with blo-
w-off pressure not exceeding the max ope-
rating pressure of the unit is mandatory (for
the max operating pressures of the units, see
Table 1 Technical data.)
CAUTION
Water can drip from the safety valve, which
is normal and you should never prevent it,
since blocking of the safety valve can cause
a threat to the user’s safety.
CAUTION
Installation of necking of any kind (such as
reducers, dirt pockets, cut-off valves, etc.)
between the safety valve or open expansion
tank and the buffer is not allowed. Only a
T-pipe with a drain valve and a T-pipe with an
expansion vessel may be installed in these
line sections.
CAUTION
Never use the equipment with clogged safety
valves.
CAUTION
Check the operation of the safety valve pe-
riodically as described by the manufacturer
of the valve in order to check whether it is
not clogged.
CAUTION
The storage tank connections may not be
made of materials more precious than car-
bon steel due to the increased electrochemi-
cal corrosion. This applies to connector pi-
pes (fi ttings) contacting the tank connector
pipe thread. Preferably, use galvanized con-
nector pipes (fi ttings.)
CAUTION

8Installation Buffer tanks
UKV 20-40, UKV 20-100
Chapter 3 |
Warnings and Practical
Recommendations
Fig. 10 Installation of the temperature sensor
1
2
3
Fig. 11 Installation of electric heating module
2
4
1
3
• Limit the setpoints of the heating medium tempe-
rature controllers in the buffer tank supply lines
to 85 °C.
• Check the operation of the safety valve perio-
dically as described by the manufacturer of the
valve in order to check whether it is not clogged
• Report any malfunctions in the buffer tank opera-
tion to the authorized service centres.
• Open the vent to vent the buffer tank before the
heating season start.
• Check fi lling of the C/H system from time to time.
Practical Recommendations:
Installation of electric heating
module (ONLY UKV 20-100)
In UKV 20-100 buffer tanks, it is possible to install an
electric heating module. To install the module (Fig.11):
1. Unscrew the screws that secure the housing co-
ver. (1)
2. Remove the housing cover including thermal in-
sulation. (2)
3. Unscrew the plug for securing the connection. (3)
4. Screw the electrical heating element into the soc-
ket. (4) The thread should be sealed with sealing
material.
Table 1. Electric modules
Storage
Tank Type Hea ng ele- ment power
Connec on
diameter
UKV 20-100
MEL 1030 3 kW 1 ½”
MEL 1060 6 kW 1 ½”
WP-6.8 4,5 kW 1 ½”

9Buffer tanks
UKV 20-40, UKV 20-100
Chapter 4 |
Chapter 5 |
Service
Recycling and disposal
Warnings:
• Never activate circulation of the heating medium
unless the buffer tank is fi lled with the heating
medium.
• Never operate the buffer tank if you fi nd any mal-
function in the safety valve operation.
• Never install any device (such as cut-off and/or
check valves, etc.) between the tank and the safe-
ty valve or open expansion tank (except T-pipes.)
• Any repairs of the buffer tank by the user are for-
bidden.
• Stopping water leaks from the safety valve is not
allowed.
Fig. 12 Installation of the UKV 20-40 buffer tank in se-
ries in order to increase the heating system capacity
Fig. 13 Installation of the UKV 20-100 buffer tank in
series in order to increase the heating system capacity
heat
source
heat
source
4 Service
5 Recycling and disposal
According to the NIBE rules, the products have been
manufactured of high quality materials using the la-
test technologies and solutions that do not endanger
the environment.
When selecting materials, we took into account both
the possibility of reuse of materials (recycling) that
can be disassembled and separated from materials
unsuitable for recycling, as well as risks arising from
the processing of materials not intended to reuse.
The purchased device consists in more than 90 % of
parts that can be recycled and reused, so they are
safe for the environment and human health.
Report any malfunctions in the buffer tank operation
to the authorized service centres.
The tank may only be repaired / serviced by
an authorized service since improper repair
can cause safety risks, and the loss of pro-
duct warranty.
CAUTION
In order to prevent damage to piping systems
and environmental pollution, the product sho-
uld only be disassembled and taken out of
service by appropriately qualifi ed specialists.
CAUTION
At end-of-life, take care that the product and
all the equipment were disposed of in accor-
dance with applicable regulations.
CAUTION
The packaging, in which the product is deli-
vered, is made mainly of materials suitable
for recycling and utilization. After installa-
tion, you should ensure the proper disposal
of packaging in accordance with applicable
regulations.
TIP

10 Technical Data Buffer tanks
UKV 20-40, UKV 20-100
Chapter 6 |
6 Technical data
Tabela 1.Technical data.
Dimensions
1012
495 962
Fig. 14 Dimensions of the UKV 20-100 buffer tanks
1” int.
ø450
temperature
sensor cover
260
ø450
225
Fig. 15 Dimensions of the UKV 20-40 buffer tanks
Parameter U/m Buffer type
UKV 20-40 UKV 20-100
Energy effi ciency class - B C
Storage volume (V)* l 38,5 97,5
Standing loss (S)* W 28,3 59,6
Max tank operating temp. °C 85
Max tank operating pressure bar 6
Weight kg 17 34
* Acc. to EU regulations No. 812/2013 & 814/2013.
1½” int.

11Buffer tanks
UKV 20-40, UKV 20-100
Notes:

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