Nibe PCM 40, Installer Manual, Page: 17 / 52

Pipe connections
General
NOTE
Pipes and other cold surfaces must be insu-
lated with diffusion-proof material to prevent
condensation. Where the cooling demand is
high, fan convectors with drip trays and drain
connection are needed.
The brine circuit must be supplied with a pressure ex-
pansion vessel. If there is already a level vessel installed
this should be replaced.
Expansion vessel
The brine circuit must be supplied with a pressure ex-
pansion vessel (membrane type). If there is already a
level vessel installed this should be replaced.
To prevent malfunctions, the pressure expansion vessel
should be dimensioned as set out in the diagram. The
pressure expansion vessel covers the temperature range
from -10 °C to +20 °C, at a pre-pressure of 0,5 bar,
and the safety valve's opening pressure of 3 bar. The
brine side must normally be pressurised to between
1,0 and 1,5 bar.
0
0 100 200 300
10
20
30
40
50
400 500 600 700 800 900 1000
Expansion vessel
Brine volume
Outline diagram
Explanation
Heat pump EB100
Temperature sensor, outdoor BT1
Temperature sensor, hot water BT6
Particle filter HQ1
Climate system 2 (ECS 40/ECS 41) EP21
Accessory card AA5
Flow temperature sensor, extra climate
system BT2
Return line sensor, extra climate system BT3
Circulation pump, extra climate system GP20
Shunt valve QN11
PCM 40/42 EQ1
Temperature sensor, external flow line BT25
Heat exchanger, cooling EP6
Circulation pump, cooling GP13
Reversing valve, cooling/heating QN12
Mixing valve, cooling QN18
Non-return valve RM1
Non-return valve RM2
Miscel-
laneous
Manometer, brine BP6
Expansion vessel CM1
Expansion vessel, brine CM3
Accumulator tank with hot water coil CP1
Collector EP12
Safety valve, heating medium FL2
Filler valve, brine QM12
Vent valve, brine QM21
Shut-off valve, heating medium flow QM31
Shut off valve, heating medium return QM32
Shut off valve, brine return QM34
Filling set, brine XL15
Designations in component locations according to
standard IEC 81346-1 and 81346-2.
17
GB