Insulation; Commissioning - STIEBEL ELTRON GWS 1 Installation

INSTALLATIoN

Commissioning

Required water quality
Common problems when using groundwater as a heat source
include:
- Erosion of heat exchanger and water supply lines
- Heat exchanger corrosion
- Sludge contamination or blockages in heat exchanger and
supply lines.
- Sedimentation (blocking) of the return well
To prevent such problems, the quality of the groundwater used
as the heat source must meet the following standards:
- The water must not contain any matter which might
settle.
- Never use surface water or saline water.
- The iron and manganese content must be less than 0.5
mg/l.
In pertinent individual cases, e.g. wells near salt mining areas
or regions with a great prevalence of livestock, the following
water content needs to be taken into consideration:
- Chloride < 300 mg/l
- Chlorine < 0.5 mg/l
If one of the specified limits is exceeded, operation of the
groundwater module is not permissible.
To prevent blockage of the heat exchanger caused by solid
particles transported with the groundwater (sand, fine sludge,
etc.), install a suitable dirt filter with a mesh size of 0.6 mm on
site at the heat source flow. You can obtain a suitable dirt filter
via your contractor or from us as a spare part. Install appropri-
ate pre-filters and settlement basins if higher levels of solid
particles are transported with the groundwater.
f After filling, vent the heat source system.
f Adjust the heat source flow rate so that the brine flow rate
at the ground source heat pump always corresponds to
the required values.
Note
Read and observe the operating and installation in-
structions for the ground source heat pump and the
diagrams in chapter "Specification".

3.4 Insulation

To avoid condensate and therefore damage to the heat source
system and the brine circuit, insulate them with diffusion-proof
material.
f Also insulate the drain & fill valve, the air vent valve and
the brine pressure switch.
GWS
f Fit the insulation hoses as shown in the diagram above.
1
3
1 Lower shell
2 Upper shell
3 Clip
f After insulation, fit the upper shell on the groundwater
station.
f Secure the upper shell to the lower shell using the clips
provided.
4. Commissioning
f Move the levers of the 3-way ball valves to the throughput
position.
f Check the system pressure in the brine circuit. The system
must have overpressure of at least 0.1 MPa.
f WPM 3: In the DIAGNoSIS menu, use the RELAY TEST SYS-
TEM parameter to check the function of the source pump.
f WPMsystem: In the DIAGNoSIS menu, use the RELAY TEST
SYSTEM parameter to check the function of the source
pump (oUTPUT X2.9).
f In the INFo / SYSTEM / SoURCE menu, read off the
SoURCE TEMPERATURE and check this value for
plausibility.
f In the INFo / SYSTEM / SoURCE menu, check the SoURCE
TEMPERATURE MIN.
f Commission the ground source heat pump.
The GWS temperature differential between the heat source
flow and the heat source return should be no higher than 3 K.
The temperature differential ∆ϕ 1 in the heat source circuit
must be greater than the temperature differential ∆ϕ 2 in the
brine circuit.
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