Nibe UKV 20-1000, Installation And Operating Manual

Page: 8 / 16

8 Buff er tanks
UKV 20-220/300/500/750/1000
3.3 Installati on Requirements
Installati on and commissioning of the buff er tank shall
only be done by appropriately qualifi ed installer. The
installer should inform the user of the functi ons of the
product and provide the necessary informati on on its
safe use.
CAUTION
Buff er tanks Series UKV can be connected to open or closed
central heati ng systems. Pressure in the C/H system may not
exceed the max operati ng temperature of the unit (for the
allowable operati ng parameters of the units, see Table 2 Tech-
nical data.) Connect the buff er tank in accordance with the
installati on diagram. Remember to install the appropriate
safety valves.
In closed systems, use of a safety with blow-off pressu-
re not exceeding the max operati ng pressure of the
unit is mandatory (for the max operati ng 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
Open System
UKV buff er tanks can be included in an open C/H system pro-
tected in accordance with actual norms or standards of pro-
tecti on.
Fig. 12 Diagram of the buff er tank installati on in an open system
1. Buff er tank.
2. Cut-off valve.
3. Drain valve.
4. Open expansion tank.
Closed System
Buff er tanks Series UKV can be connected to a closed C/H sys-
tem in accordance with relevant regulati ons and standards.
Buff er tank operati ng in a closed circuit must be equipped
with correctly dimensioned safety valve (preferably in the he-
ati ng medium return line to the heati ng source), with blow-
-off pressure not exceeding the max operati ng pressure of the
unit (for the max operati ng pressures of the units, see Table
1 Technical data. ) Some amount of the heati ng medium can
leak from the safety valve during normal operati on, therefore,
you should install a drain line in the safety valve, allowing safe
drain of the heati ng 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 atmos-
phere. NIBE is not responsible for fl ooding the room through
the safety valve.
Installati on of necking of any kind (such as reducers,
dirt pockets, cut-off valves, etc.) between the safety
valve or open expansion tank and the buff er is not al-
lowed. Only a T-pipe with a drain valve and a T-pipe
with an expansion vessel may be installed in these line
secti ons.
CAUTION
Never use the equipment with clogged safety valves.
CAUTION
Check the operati on of the safety valve periodically as
described by the manufacturer of the valve in order to
check whether it is not clogged.
CAUTION
Fig. 13 Diagram of the buff er tank installati on in a closed system
1. Buff er tank
2. Cut-off valve
3. Drain valve
4. Safety valve
5. Expansion vessel
2
2
2
3
2
1
2
2 3
4
5
1
2
2
supply from the
heat source
return to the
heat source
supply from the
heat source
return to the
heat source
heati ng system
supply
return from the he-
ati ng system
return from the he-
ati ng system
heati ng system
supply
to sewerage
When connecti ng the buff er tank to a closed C/H sys-
tem, you have to install an additi onal or increase capaci-
ty of the existi ng expansion vessel.
Informati on
to sewerage
4
The lower return connecti ons to the heati ng source and
from the heati ng system can be connected in opposite
confi gurati on.
Informati on
INSTALLATION AND OPERATING MANUAL