STIEBEL ELTRON WPF 13 User Manual

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INSTALLATION
Installation
11.4.3 Connection and filling with brine
 Thoroughly flush the pipework 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 Brine filling unit
WPSF in the heat source inlet (see chapter "Accessories").
To facilitate an easy connection to the brine circuit, the appliance
is supplied with plug-in connectors (see chapter “Fitting the push-
fit connector”).
You can find the brine volume of the heat pump under operating
conditions in the data table (see chapter "Specification").
The overall volume equals that of the required amount of brine
that should be mixed from undiluted ethylene glycol and water.
The chloride content of the water must not exceed 300 ppm.
Mixing ratio
The brine concentration varies when using a ground collector or
a geothermal probe as a heat source.
For the mixing ratio see the table below.
Ethylene glycol Water
Geothermal probe 25 % 75 %
Ground collector 33 % 67 %
Charging the brine circuit
Note
 Insulate the brine lines with diffusion-proof thermal
insulation.
Note
The WPF S series does not have a brine pressure switch.
The integral diaphragm expansion vessel is opened and sealed
at the factory.
 Check the pre-charge pressure (set pressure: 0.5bar) of the
diaphragm expansion vessel on the brine side.
 If necessary, adjust the pre-charge pressure.
The brine/water heat pump is equipped with a brine pressure
switch in the brine circuit. The brine pressure switch prevents
brine getting into the ground if there is a leak in the brine circuit.
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.
 Charge the system according to the following curve.
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 charge pressure subject to the system volume with
33% brine
2 Required charge pressure subject to the system volume with
25% brine
1
D0000036149
1 Drain, brine side
 Fill the brine circuit via the drain.
After filling the system with brine and prior to commissioning,
open the drain until brine runs out of it. No water must remain in
the pipe run to the drain.

STIEBEL ELTRON WPF 13 Specifications

General

Brand	STIEBEL ELTRON
Model	WPF 13
Category	Heat Pump
Language	English