Pipe connections
General
NOTE
Pipes and other cold surfaces must be insulated
with diffusion-proof material to prevent con-
densation. Where the cooling demand is high,
fan convectors with drip trays and drain connec-
tion are needed.
The brine circuit must be provided with a pressure expan-
sion vessel. If there is a level vessel this should be re-
placed.
Expansion vessel
The brine circuit must be supplied with a pressure expan-
sion 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
10
20
30
40
50
0
200
400
600
800
1000
Expansion vessel
Brine volume
Outline diagram
Explanation
Heat pumpEB100
Temperature sensor, outdoorBT1
Temperature sensor, hot waterBT6
Particle filterHQ1
Climate system 2 (ECS 40/ECS 41)EP21
Accessory cardAA5
Flow temperature sensor, extra climate sys-
tem
BT2
Return line sensor, extra climate systemBT3
Circulation pump, extra climate systemGP20
Shunt valveQN11
PCM 40/42EQ1
Temperature sensor, external flow lineBT25
Heat exchanger, coolingEP6
Circulation pump, coolingGP13
Reversing valve, cooling/heatingQN12
Mixing valve, coolingQN18
Non-return valveRM1
Non-return valveRM2
Miscel-
laneous
Manometer, brineBP6
Expansion vesselCM1
Expansion vessel, brineCM3
Accumulator tank with hot water coilCP1
CollectorEP12
Safety valve, heating mediumFL2
Filler valve, brineQM12
Vent valve, brineQM21
Shut-off valve, heating medium flowQM31
Shut off valve, heating medium returnQM32
Shut off valve, brine returnQM34
Filling set, brineXL15
Designations in component locations according to
standard IEC 81346-1 and 81346-2.
PCM 40/42 | GB18
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