Pipe connections
GENERAL
The pipe installation must be carried out in accordance with
applicable standards.
A circulation pump must be used to ensure the flow over
the immersion heater. If the heating system valves can close
the circulation completely, the bypass valve must be in-
stalled so that the flow through the electric heater does not
stop. In closed installations an approved safety valve and
pressure expansion vessel must be used.
Caution
Also see the installer manual for your heat
pump/indoor module.
NOTE
The pipe work must be flushed before the electric
heater is connected, so that any contaminants do
not damage the component parts.
DRAINING
The system is most easily drained by installing a drainage
valve at the lowest point on the pipe installation. The remain-
ing water in ELK 26 is drained through the return line con-
nection (XL2), see "Component location" on page 17. If the
return line connection on ELK 26 is normally used for drain-
ing the unit, a drain valve can be installed here.
NOTE
The pipe work must be flushed before the electric
heater is connected, so that any contaminants do
not damage the component parts.
PRESSURE DROP DIAGRAM ELK 26
Pressure drop
Flow (l/s)
0
0
0,1 0,2
0,3
0,4
1,1
1
2
3
4
6
(kPa)
(l/s)
0,5
0,6
0,7
5
1,0
0,9
0,8
(kPa)
SYSTEM DIAGRAM
NOTE
This is the outline diagram. Actual installations
must be planned according to applicable stand-
ards.
SYMBOL KEY
Meaning
Symbol
Shut-off valve
Non-return valve
Circulation pump
Expansion vessel
Pressure gauge
P
Temperature sensor
Trim valve
Heat pump
Radiator system
Designations according to standard EN 81346-2.
OUTLINE DIAGRAM
ELK 213
P
NIBE ELK 26 | GB
18