Nibe UKV 20-220 Installation instructions

20.01.2020
25617
Installation & Operating Manual
Bu󰀨 er Tank
UKV 20-220
UKV 20-300
UKV 20-500
UKV 20-750
UKV 20-1000

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 e󰀩ciency or with-
out su󰀩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-BIAWAR 2020

3
Table of Contents |
Bu󰀨er tank
UKV 20- 220-1000
Table of Contents
1 General_________________________ 4
Introduction _________________________ 4
Intended Use _______________________ 4
2 Design _________________________ 5
3 Installation _____________________ 7
Location of the Tank _________________ 7
Housing Disassembly _______________ 7
Installation Requirements____________ 8
4 Connection and start-up _______ 9
Connection _________________________ 9
Start-Up ____________________________ 9
Thermal Insulation of the System ___ 10
Frost Protection ____________________ 10
Warnings and Recommendations ___ 10
5 Service ________________________10
6 Recycling and disposal _______10
7 Technical data_________________ 11
Dimensions ________________________ 11

4Chapter 1 | General Bu󰀨 er tank
UKV 20- 220-1000
Thank you for your con dence and choice of equip-
ment by NIBE. To fully bene t from the advantages
of this product, you should read this Manual before
using it, and in particular chapters relating to the ap-
plication, installation and maintenance, and warranty.
Please keep this Manual in a safe place for future
reference.
Bu󰀨 er tanks are used for storage and transfer of ener-
gy contained in the heating medium. The accumulat-
ed energy is transferred to the heating system. Bu󰀨 er
tanks can operate with a variety of heat sources in
central heating systems such as heat pumps, solid
fuel boilers, solar heating systems, etc.
When used in the system containing a solid fuel- red
boiler, the low capacity tank improves the uniform
heat removal. It reduces the amount of  re ups and
additionally enables the boiler operation at the design
power rating. This also enhances the e󰀩 ciency and
life of the boiler. NIBE bu󰀨 er tanks enable operation
with virtually any type of central heating system. Dur-
ing the installation and operation, always follow the
instructions in this Manual.
1 General
Introduction
Intended Use
Sections of the Manual relating to the instal-
lation, inspection and maintenance are in-
tended for the quali 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
Bu er tanks are designed for heating up
and supplying the heating medium. Any in-
appropriate use, not in compliance with its
intended use is not permitted. Neither manu-
facturer nor supplier shall be responsible for
damages resulting from this.
CAUTION
Fig. 2 UKV 20-500 bu󰀨 er tank.
Fig. 3 UKV 20-750 bu󰀨 er tank.
Fig. 1 UKV 20-220 bu󰀨 er tank.

5Chapter 2 | ConstructionBu󰀨 er tank
UKV 20- 220-1000
2 Construction
UKV Bu󰀨 er 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
and are equipped with a Temperature gauge. Tanks
have connector pipes and temperature sensor covers
for mounting the sensor and temperature measure-
ment at di󰀨 erent levels in the tank, as well as connec-
tors for mounting an electrical heating unit.
Bu󰀨 er tanks with a capacity of 750 and 1000 litres
are equipped with a special bar (gate) located on the
left side of the tank, whose task is to provide layered
arrangement of the heating medium in the tank.
Fig. 4 Section of the UKV 20-220 bu󰀨 er tank.
Fig. 5 Section of the UKV 20-300 / 20-500 bu󰀨 er
tank.
Fig. 6 Side view of the UKV 20-220 bu󰀨 er tank.
Fig. 7 Side view of the UKV 20-300 / 20-500 bu󰀨 er
tank.
All products are ready for the installation of
a heating unit containing an electric heater
with thermostat and thermal switch.
INFORMATION
XL1
XL8
UA1
UA2
UA3
XL2
XL9
UL1
QM22
XL1
XL8
UA1
UA2
UA3
XL2
XL9
UL1
QM22
XL35
XL54
XL35
XL36
XL54

6Chapter 2 | Construction Bu󰀨 er tank
UKV 20- 220-1000
Fig. 8 Section of the UKV 20-750 and UKV 20-1000
bu󰀨 er tank.
Fig. 9 Side view of the UKV 20-750 and UKV 20-1000
bu󰀨 er tank.
Description:
QM22 Vent
UA1-UA3 Temperature sensor cover
UL1 Adjustable foot
XL Connector pipe
XL1 Connector pipe (heating system supply)
XL2 Connector pipe (return from the heating system)
XL8 Connector pipe (supplying from the heat source)
XL9 Connector pipe (return to the heat source)
XL35-XL36 Connector pipe for mounting electric heating unit
XL54 Thermometer.
XL35
XL54
XL1
XL8
UA1
UA2
UA3
XL2
XL9
UL1
QM22
XL
XL
XL
XL

7Chapter 3 | InstallationBu󰀨 er tank
UKV 20- 220-1000
UKV bu󰀨 er tanks can be installed in any room pro-
tected against temperature drop below 0°C, which
will prevent freezing of water in the tanks. It should be
installed in a convenient place for the user (eg base-
ment, boiler room, etc.), in a way that will enable easy
maintenance or servicing in the future.
Select the device location in a way allowing the rational
routing of the central heating system. We recommend
installation of the bu󰀨 er tanks in the immediate vicinity
of the main heat source in order to avoid unnecessary
heat losses. Consider the  lled tank weight when se-
lecting its location as well as free space above and on
the sides of the bu󰀨 er tank required to perform mainte-
nance and inspections of the unit.
3 Installation
Location of the Tank
Housing Disassembly
Fig. 10 Levelling the unit.
Removable housing with thermal insulation facilitate
transport and installation of the tank. Disassembly the
housing in the following order (see Fig. 11):
After the installation of the tank in its  nal location, re-
install the removed components in the reverse order.
Fig. 11 Housing disassembly
1. Remove the Temperature gauge and plugs of the
heating element connector pipes.
2. Remove the upper cover of the housing together
with thermal insulation.
3. Remove the plugs from the connector pipes and
black bushings.
4. Remove the  xing screws and the strip connect-
ing the housing jacket.
5. Remove the jacket surrounding the tank (housing
jacket.)
6. Remove the four-piece thermal insulation.
The tank stands on three adjustable feet that can be ad-
justed within the range from 0 to 15 mm to level the tank.
0-15 mm
1
2
3
4
5
6

8Chapter 3 | Installation Bu󰀨 er tank
UKV 20- 220-1000
Installation and commissioning of the bu er
tank shall only be done by appropriately qual-
i ed installer. The installer should inform the
user of the functions of the product and pro-
vide the necessary information on its safe use.
CAUTION
In closed systems, use of a safety with blow-
o pressure not exceeding the max operat-
ing pressure of the unit is mandatory (for the
max operating pressures of the units, see Ta-
ble 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-o valves, etc.)
between the safety valve or open expansion
tank and the bu er 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 peri-
odically as described by the manufacturer of
the valve.
CAUTION
Bu󰀨 er 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 parameters
of the units, see Table 1 Technical data.) Connect the
bu󰀨 er tank in accordance with the installation diagram.
Remember to install the appropriate safety valves.
UKV bu󰀨 er tanks can be included in an open C/H
system protected in accordance with actual norms or
standards of protection.
Fig. 12 Diagram of the UKV 20-220 bu󰀨 er tank installa-
tion in an open system.
Bu󰀨 er tanks Series UKV can be connected to a closed
C/H system in accordance with relevant regulations
and standards.
Bu󰀨 er 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-o󰀨 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.
The safety valve outfl ow line should be installed with
a slope and be protected against water freeze, and it
should remain open to the atmosphere. The manu-
facturer is not responsible for fl ooding the room as a
result of the valve operation.
supply from
the heat
source
return to the
heat source
heating system
supply
return from the
heating system
to sewerage
Installation Requirements
Open System
Closed System
When connecting the bu er tank to a closed
C/H system, you have to install an additional
or increase capacity of the existing expan-
sion vessel.
INFORMATION
Description:
CP1 Bu󰀨 er tank.
QM31 Cut-o󰀨 valve- supply from the heat source
QM32 Cut-o󰀨 valve - return to the heat source
QM40 Cut-o󰀨 valve- heating system supply
QM41 Cut-o󰀨 valve- return from the heating system
QM1 Drain valve.
CM3 Open expansion tank.
CP1
QM40
QM41
QM1
QM31
QM32
CM3

9Chapter 3 |
Chapter 4 |
Installation
Connection and start-up
Bu󰀨 er tank
UKV 20- 220-1000
The storage tank connections may not be
made of materials more precious than car-
bon steel due to the increased electrochem-
ical corrosion. This applies to connector
pipes ( ttings) contacting the tank connector
pipe thread. Preferably, use galvanized con-
nector pipes ( ttings.)
CAUTION
Fig. 13 Diagram of the UKV 20-220 bu󰀨 er tank instal-
lation in a closed system.
supply from the
heat source
return to the
heat source
return from the
heating system
heating system
supply
to sewerage
We recommend connecting the tank connec-
tor pipes with the system lines by means of
unions to allow disconnection of the tank, if
required.
INFORMATION
The lower return connections to the heating
source and from the heating system can be
connected in opposite con guration.
INFORMATION
After connecting all components of the C/H system,
do the following:
1. Fill up the C/H system with the heating medium.
2. Check tightness of all connections.
3. After checking for tightness, insulate the pipe-
lines together with the tank  ttings thoroughly.
4. Fill up the C/H system with the heating medium
and vent the system.
You can  ll the bu󰀨 er tank directly from the C/H sys-
tem or through the tank drain valve. Vent the tank
and the C/H system after  lling them. Vent the unit
through the vent installed in the top head of the tank
(see Fig. 14).
After completion of the above steps, the system is
ready for operation. You can use the facility heating
system after starting up the heat source and reaching
the required temperature of the heating medium.
After the installation and levelling the tank, follow the
procedure below (for the connector pipe numbers, re-
fer to Fig. 4, 5, 6, 7, 8, 9 ):
Filling and venting the bu󰀨 er tank:
Fig. 14 Venting the bu󰀨 er tank
1. Remove protecting plugs from the connector pipes.
2. Connect the supply line from the heat source (XL8).
3. Connect the return line to the heat source (XL9).
4. Connect the heating system supply line (XL1).
5. Connect the return line from the heating system
(XL2).
6. Install the required temperature sensors (UA).
7. If necessary, connect the electric heating unit to the
connector pipe (XL35, XL36) in UKV 20-300, UKV
20-500 or (XL35) in UKV 20-220, UKV 20-750,
UKV 20-1000.
4 Connection and
start-up
Connection
Start-Up
CP1
QM36
QM37
QM1
QM31
QM32
CM2
FL1
Description:
CP1 Bu󰀨 er tank
QM31 Cut-o󰀨 valve- supply from the heat source
QM32 Cut-o󰀨 valve - return to the heat source
QM36 ZCut-o󰀨 valve- heating system supply
QM37 Cut-o󰀨 valve- return from the heating system
QM1 Drain valve
CM2 Expansion vessel
FL1 Safety valve

10 Bu󰀨er tank
UKV 20- 220-1000
Chapter 4 |
Chapter 5 |
Chapter 6 |
Connection and start-up
Service
Recycling and disposal
Switch OFF the heating units and wait until
the heating medium cools down completely
in the C/H system before venting the buer
tank.
CAUTION
Ensure that the entire C/H system is lled
with the heating medium before heating the
system up for the rst time or after a longer
break in its operation.
CAUTION
Thermal Insulation of the System
Frost Protection
In order to minimize thermal energy losses, insulate
all connector pipes, pipelines and temperature sensor
covers thoroughly after the installation of the unit and
performance of the leak proof test. For this purpose,
use thermal insulation of correctly selected thickness
and thermal insulation parameters.
• Limit the setpoints of the heating medium temper-
ature controllers in the bu󰀨er tank supply lines to
85°C.
• Check the operation of the safety valve periodical-
ly as described by the manufacturer of the valve.
• Report any malfunctions in the bu󰀨er tank opera-
tion to the authorized service centres. You can nd
the complete list of our authorized service centres
on our website.
• Open the vent to vent the bu󰀨er tank before the
heating season start.
• Check lling of the C/H system from time to time.
• Never activate circulation of the heating medium un-
less the bu󰀨er tank is lled with the heating medium.
• Never operate the bu󰀨er tank if you nd any mal-
function in the safety valve operation.
Report any malfunctions in the bu󰀨er tank operation
to the authorized service centres.
According to the NIBE-BIAWAR rules, the products
have been manufactured of high quality materials us-
ing the latest 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.
• Never install any device (such as cut-o󰀨 and/or
check valves, etc.) between the tank and the safety
valve or open expansion tank (except T-pipes.)
• Any repairs of the bu󰀨er tank by the user are for-
bidden.
• Stopping water leaks from the safety valve is not
allowed.
If you plan to interrupt operation of the unit and there
is a risk of freezing the heating medium in the tank,
drain the tank and the entire heating system associ-
ated with it completely.
Lack of thermal insulation, its incorrect thick-
ness or insulation made of inadequate mate-
rials will cause decrease of thermal insulation
properties of the system.
INFORMATION
Warnings and Practical Recom-
mendations
Practical Recommendations
Warnings
5 Service
The tank may only be repaired / serviced by
an authorized service since improper repair
can cause safety risks, and the loss of prod-
uct warranty.
CAUTION
In order to prevent damage to piping systems
and environmental pollution, the product
should only be disassembled and taken out of
service by appropriately qualied specialists.
CAUTION
At end-of-life, take care that the product and
all the equipment were disposed of in ac-
cordance with applicable regulations.
CAUTION
6 Recycling
and disposal
The packaging, in which the product is deliv-
ered, is made mainly of materials suitable for
recycling and utilization. After installation, you
should ensure the proper disposal of packag-
ing in accordance with applicable regulations.
INFORMATION

11Bu󰀨 er tank
UKV 20- 220-1000
Chapter 7 | Technical data
7 Technical data
Table 1. Technical data.
Parameter U/m
Tank model
UKV
20-220
UKV
20-300
UKV
20-500
UKV
20-750
UKV
20-1000
Energy effi ciency class - C C C C C
Storage volume (V)* l218,3 296,0 495,6 740,7 991,0
Standing loss (S)* W77,1 94,6 97,5 122,5 140,4
Max tank operating temp. °C 85
Max tank operating pressure bar 6 10 3
Electric heating module
connection inch 2” female 2 x 2” female
2 x 2”
female 2” female 2” female
Weight kg 61 83 111 170 200
* Acc. to EU regulations No. 812/2013 & 814/2013.
Dimensions
Fig. 15 Dimensions of the UKV 20-220 bu󰀨 er tanks.
D
E
F
H
I
J
K
L
O
W
XL1
UA1
UA2
UA3
XL2
XL35
XL9
XL8
XL54
QM22

12 Bu󰀨 er tank
UKV 20- 220-1000
Chapter 7 | Technical data
Fig. 16 Dimensions of the UKV 20-300, UKV 20-500 bu󰀨 er tanks.
D
E
F
GH
I
J
K
L
O
W
Table 2.Connector pipe diameters in the UKV 20-220, UKV 20-300, UKV 20-500 bu󰀨 er tanks.
XL36
XL2
UA3
UA2
UA1
XL1
XL8
XL35
XL9
QM22
XL54
Connection U/m Bu󰀨 er tanks
UKV 20-220 UKV 20-300 UKV 20-500
XL9 Return to heat source
inch
1 ½” female
XL35 Heating unit connection 2” female
XL8 Supply from heat source 1 ½” female
XL36 Heating unit connection - 2” female
XL2 Return from heating system 1 ½” female
UA3 Temperature sensor cover
mm
ø16 female
UA2 Temperature sensor cover ø16 female
UA1 Temperature sensor cover ø16 female
XL1 Supply of the heating system inch 1 ½” female
QM22 Vent ¾” female
XL54 Thermometer enclosure mm ø10 female

13Bu󰀨 er tank
UKV 20- 220-1000
Chapter 7 | Technical data
Dimensions
UKV 20-220 UKV 20-300 UKV 20-500
øA mm 445 530 650
Bmm 650 725 852
Cmm 625 702 856
Dmm 215 275 350
Emm 547 830 967
Fmm 1336 1253 1400
Gmm - 270 357
Hmm 247 376 387
Imm 457 460 547
Jmm 857 876 897
Kmm 1257 1194 1277
Lmm 1376 1309 1437
Omm 1650 1634 1834
Wmm 21 -0/+15
Table 3. Dimensions of the UKV 20-220, UKV 20-300, UKV 20-500 bu󰀨 er tanks.
C
B
Fig. 17 Dimensions of the UKV 20-750, UKV 20-1000 bu󰀨 er tanks.
D
E
F
G
H
I
JK
L
M
N
P
S
W
øA
XL8
XL1
QM22
UA1
XL
UA2
XL
UA3
XL2
XL9
XL
XL
XL35
XL54

14 Bu󰀨er tank
UKV 20- 220-1000
Chapter 7 | Technical data
Table 4.Connector pipe diameters in the UKV 20-750, UKV 20-1000 bu󰀨er tanks.
Table 5. Dimensions of the UKV 20-750, UKV 20-1000 bu󰀨er tanks.
Connection U/m Bu󰀨er tank
UKV 20-750 UKV 20-1000
XL9 Return to heat source
inch
2” female
XL Connector pipe 2” female
XL35 Heating unit connection 2” female
XL Connector pipe 2” female
XL8 Supply from heat source 2” female
XL2 Return from heating system 2” female
UA3 Temp. sensor enclosure mm ø16 female
XL Connector pipe inch 2” female
UA2 Temp. sensor enclosure mm ø16 female
XL Connector pipe inch 2” female
UA1 Temp. sensor enclosure mm ø16 female
XL1 Heating system supply inch 2” female
QM22 Vent ¾” female
XL54 Thermometer enclosure mm ø10 female
Dimensions U/m Bu󰀨er tank
UKV 20-750 UKV 20-1000
øA
mm
750 850
B1020 1130
C1000 1110
D113 128
E511 546
F541 576
G1041 1076
H1561 1596
I113 128
J571 606
K721 756
L1036 1071
M1226 1261
N1406 1441
P1786 1841
S2023 2091
W21 -0/+15