C11:
Expansion tank
E42:
Hot water cylinder
F21:
Safety valve
F22:
Safety valve
F31:
Safety valve
G2 (P2): Heat carrier pump (collector)
G3 (P3): Heat transfer fluid pump
V21:
Filter heating system
V31:
Filter Heat transfer fluid in
V40:
Hot water draw-off
W40:
Cold water cylinder inlet
Symbols according to ISO/FDIS 14617.
Letter codes according to IEC 61346-2.
This is a principal drawing.
32
The heat pump and collector hose in general
41
Collector hose
The task of the collector hose is to convey the heat transfer fluid through
the ground or lake to gain a few degrees of heat. The hose consists of a
thin-walled plastic hose of the type PEM 40 x 2.4 PN 6.3. SDR11.
It is important when the collector hose is placed in the ground that air
pockets are avoided.
Installation and refilling around the collector
hose
Installation and filling the soil around the collector hose should follow
applicable material and working descriptions and regulations.
It is important that the filling material does not contain stones or other
sharp objects that can damage the collector hose. The hose should be
pressure tested to 3-4 bar for a minimum of 1 hour or 6 hours for
Compact collectors to ensure there are no leaks.
Use hose pliers, not a saw, when cutting the collector hose. Clear the
hose ends from chips. It is important that no dirt or gravel enters the
system. Dirt and gravel can cause a blockage in the heat pump. Deburr
the outside of the pipe end.
Minimum permitted bending diameter
Minimum permitted bending diameter is 1 metre. If sharper bends are
required an elbow connector must be used. If the collector hose is
damaged by too sharp a bend, you can repair the damage by using a
straight coupling.
Maximum length of the collector hose
The maximum length of the collector hose is based on the heat transfer
fluid pressure setting. We recommend a heat transfer fluid consisting of
max 29 per cent ethanol by volume and water. Ethanol has good
environmental and technical properties even at low temperatures and
should therefore be used instead of other heat transfer fluids.
Connect the Greenstore heat pump to the heating system
The built-in control unit controls the heat pump using the outdoor sensor T2 (GT2) and the return sensor T1 (GT1)
according to the outdoor compensated control curve. When the heat pump is unable to meet the heating requirements, the
electric heater starts automatically and together with the heat pump provides the required temperature. The heating of hot
water is given priority over the central heating water. Hot water heating is controlled by the sensor T3 (GT3), which is
located in the hot water cylinder. When the water in the cylinder reaches the required temperature, heat is once more
supplied to the heating system.
The control unit can also operate a second curve together with a mixing valve. The mixing valve curve must be set lower
than the heat curve for the rest of the heating system. This extra function is used, for example, in a floor heating system that
requires a lower temperature.
Connecting the sensors: External sensors T1 (GT1) and T2 (GT2) must always be connected. Sensor T4 (GT4)
is only connected if a mixing valve curve is used. The sensor T5 (GT5) is connected when the heat pump is to
be influenced by a room sensor. A room sensor is supplied as standard with the heat pump.
An absolute prerequisite for this type of connection is that at least 70% of the nominal flow can be maintained throughout the
year. Thermostatic radiator valve must remain fully open in order to ensure this. Where this is not possible, a 100 litre
primary store should be fitted. See next page.
The maximum collector hose lengths
for heat pump models are provided in
the table.
In situations where the length of the
collector hose needs to exceed the
permitted value, you can connect the
hoses in parallel.
Heat
pump
model
Maximum length of
collector hose with a
single circuit (m)
PEM 40x2.4 PN 6.3
Collector hose with 2 circuits
in parallel: Maximum length
per circuit (m)
PEM 40x2.4 PN 6.3
Greenstore 6
Greenstore 7
Greenstore 9
600
500
400
1000
800
Hose pliers
Connecting the heat pump to the heating system
Note
TECHNICAL INFORMA
TION
FOR THE USER
FOR THE INST
ALLER
TECHNICAL INFORMA
TION
FOR THE USER
FOR THE INST
ALLER