STIEBEL ELTRON HPG-I 04 S Premium - Connection and Filling with Brine

INSTALLATION
Installation
10 | HPG-I (C)S Premium www.stiebel-eltron.com
9.3.2 Connection and filling with brine
f Thoroughly flush the pipework with brine before connecting
the heat pump to the heat source circuit. Foreign bodies,
such as rust, sand and sealant, can impair the operational
reliability of the heat pump. We recommend installing our
WPSF brine charging unit in the heat source inlet (see chap-
ter "Appliance description/ Accessories").
To facilitate easy connection to the brine circuit, the appliance
is supplied with push-fit connectors (see chapter "Installation/
Fitting push-fit connectors").
The brine volume of the heat pump under operating conditions can
be found in the data table (see chapter "Specification").
The overall volume is equal to the required amount of brine made
by mixing undiluted glycol and water. The chloride content of the
water must not exceed 100ppm.
Mixing ratio
The brine concentration varies depending on whether a geother-
mal collector or a geothermal probe is used as the heat source.
For the mixing ratio see the table below.
Ethylene glycol Water
Geothermal probe 25 % 75 %
Geothermal collector 33 % 67 %
Charging the brine circuit
Note
f Insulate the brine lines with diffusion-proof thermal
insulation.
Note
The system fill pressure must be higher than the pre-
charge pressure plus the maximum pressure differential
of the brine pump.
Note
For geothermal probes, the diaphragm expansion vessel
is suitable for a fill volume of up to 600l.
The integral diaphragm expansion vessel is opened and sealed
at the factory.
f Check the pre-charge pressure (set pressure: 0.5bar) of the
diaphragm expansion vessel on the brine side.
f If necessary, adjust the pre-charge pressure.
The ground source heat pump is equipped with a brine pressure
switch in the brine circuit. If there is a leak in the brine circuit,
the brine pressure switch shuts down the appliance and prevents
brine getting into the ground.
If the pressure in the brine circuit falls below 0.7bar, the brine
pressure switch turns the heat pump off. In order for the heat
pump to be enabled again, the pressure must be raised to at least
1.5bar while the heat pump is on standby.
To prevent the brine pressure switch turning the heat pump off
when there is no leak, charge the heat source side of the heat
pump during installation with a minimum pressure of >1.5bar.
f Charge the system according to the following curve to pre-
vent an unintentional response from the brine pressure
switch.
0
0,5
1
1,5
2
2,5
3
0 200 400 600 800
1
2
D0000058692
X System volume [l]
Y Charge pressure [bar]
1 Required fill pressure depending on system volume at 33%
brine
2 Required charge pressure depending on system volume with
25% brine
1
D0000036149
1 Drain, brine side
f Fill the brine circuit via the drain.
f Vent the brine circuit.
To check the brine concentration:
f Determine the density of the glycol/water mixture, e.g. with
a hydrometer.
Using the actual density and temperature, you can check the actual
concentration in the diagram.
Note
The quoted output data relates to ethylene glycol (see
"Specification").