STIEBEL ELTRON GWS 2 Installation guide

INSTALLATION

INSTALLATIE

Grundwasserstation für Wärmepumpen | Groundwater module for heat pumps | Grondwaterstation voor Warmte pompen

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GWS | 17

ENGLISH

CONTENTS | INSTALLATION

Safety

INSTALLATION

1. Safety

Only a qualied contractor should carry out installation, com-

missioning, maintenance and repair of the appliance.

1.1 General safety instructions

We guarantee trouble-free operation and operational reliabil-

ity only if the original accessories and spare parts intended for

the appliance are used.

1.2 Further applicable documents

Note

Please observe the operating and installation instruc-

tions of system components.

1.3 Regulations, standards and instructions

Note

Observe all applicable national and regional regula-

tions and instructions.

2. Appliance description

The groundwater station is an assembly with a stainless steel

plate heat exchanger in a duplex casing made from thermally

insulating plastic.

The purpose of the groundwater station is to use groundwater

as a heat source and it can be connected to brine/water heat

pumps.

The connections for the air vent valve and drain & ll valve are

the same. The groundwater station can therefore be rotated

180° and installed on the left or right of the brine/water heat

pump, depending on the location.

The groundwater station comprises several components,

which are described in the following diagrams.

INSTALLATION

1. Safety �� 17

1.1 General safety instructions �� 17

1.2 Further applicable documents �� 17

1.3 Regulations, standards and instructions �� 17

2. Appliance description �� 17

2.1 Standard delivery �� 18

2.2 Accessories �� 18

3. Installation �� 18

3.1 Installing the groundwater station �� 19

3.2 Installing the brine circuit �� 19

3.3 Installing the heat source system �� 20

3.4 Insulation �� 21

4. Commissioning �� 21

5. Appliance handover �� 22

6. Cleaning, care and maintenance �� 22

6.1 Maintenance �� 22

7. Specication �� 23

7.1 Dimensions and connections �� 23

7.2 Standard circuits �� 25

7.3 Sizing table �� 29

7.4 Data table �� 29

GUARANTEE

ENVIRONMENT AND RECYCLING

18 | GWS

INSTALLATION

Installation

Groundwater station GWS 1

1

2

34

6

5

6

26�03�14�0095�

1 Air vent valve

2 Push-t connectors

3 Drain & ll valve

4 Intermediate piece made from EPP

5 Heat exchanger

6 3-way ball valve with ushing facility

Groundwater station GWS 2

1

2

3

5

4

5

26�03�14�0096�

1 Air vent valve

2 Push-t connectors

3 Drain & ll valve

4 Heat exchanger

5 3-way ball valve with ushing facility

2.1 Standard delivery

Delivered with the groundwater station:

- 4 double ended screws with rawl plugs, washers and nuts

- 1 air vent valve

- 1 drain & ll valve

- 1 contact sensor AVF 6

2.2 Accessories

Description Part number

Brine pressure switch 221382

3. Installation

Note

We recommend not to install the groundwater mod-

ule in wet rooms. Wet areas include rooms used, for

example, for washing or drying clothes.

To protect the groundwater station against damage, it must

be transported to the installation location inside its original

packaging.

Install the groundwater station in a suitable location next to

or above the heat pump.

26�03�14�0097�

 Ensure that the wall structure can bear the weight of the

groundwater station before securing the groundwater

station to the wall.

GWS | 19

ENGLISH

INSTALLATION

Installation

3.1 Installing the groundwater station

26�03�14�0099�

 Position the installation template horizontally at the re-

quired installation location. The installation template is

located on one of the aps of the packaging box.

 Mark the holes on the wall.

 Drill the holes.

 Insert suitable rawl plugs into the holes.

 Turn the double ended screws into the rawl plugs.

 Remove the upper shell of the insulation from the

groundwater station.

 Place the groundwater station over the double ended

screws, followed by the washers provided. Secure the

groundwater station with the relevant nuts.

1

2

26�03�14�0096�

3

1 Air vent valve

2 Drain & ll valve

3 Lever

 Fit the air vent valve and the drain & ll valve in the brine

circuit.

 Ensure that the levers of the 3-way ball valves are posi-

tioned for throughput, as shown in the diagram.

3.2 Installing the brine circuit

Note

Read and observe chapter “Installing the heat source

system” in the installation instructions for the brine/

water heat pump.

 Install a safety assembly in the brine circuit.

Note

Some brine/water heat pumps are supplied with a

safety assembly.

Note

The heat exchanger should only be operated in coun-

tercurrent (see chapter “Specication / Standard cir-

cuits”).

 Fill the brine circuit with an ethylene glycol/water mix-

ture with at least 25 % by vol. ethylene glycol. Check for

tightness.

 After lling, vent the brine circuit.

3.2.1 Heat source sensor

 Check whether a heat source sensor has already been

installed in the brine/water heat pump. If this is not the

case, install the heat source sensor at the groundwater

station heat pump return (see chapter “Specication /

Standard circuits”).

Use contact sensor AVF 6 as a heat source sensor to capture

the brine temperature.

26�03�01�1431

 Clean the pipe.

 Apply heat conducting paste.

 Secure the sensor with a cable tie.

 Connect the contact sensor on heat pump manager

WPMII to the heat source sensor connection (WPMWII

terminal X2/6 and earth; WPMSII terminal X12/1 and 2).

20 | GWS

INSTALLATION

Installation

3.2.2 Heat pump manager settings

!

Appliance damage

 First set parameter “SOURCE” to ETHYLENE GLY-

COL and then set parameter “SOURCEMIN” to

2°C on heat pump manager WPMII.

If the heat pump has an integral heat pump manager, observe

the following information.

!

Appliance damage

 For a brine/water heat pump with integral heat

pump manager, set parameter “SOURCE” to

“GWS”.

3.2.3 Brine pressure switch DWS

To prevent any leaks causing damage to the heat pump, install

a brine pressure switch if not already pre-tted to the brine/

water heat pump.

 Make the brine pressure switch electrical connections ac-

cording to the wiring diagram in chapter “Specication”.

You can obtain a suitable brine pressure switch via your con-

tractor or from us as an accessory. For the part number, see

chapter “Accessories”.

3.2.4 Fitting the push-t connector

Push-t connectors are tted to the brine circuit connections

to make it easier to connect to the heat pump.

The push-t connectors are equipped with a retainer with

stainless steel serrations and an O-ring for sealing. In addition,

they are designed with the “twist and lock” function. By sim-

ply turning the screw cap manually, the pipe is secured in the

connector, and the O-ring is pushed against the pipe to seal it.

!

Appliance damage

Support sleeves are required when using plastic pipes.

Making the connection

The connector must be in its relaxed position before the pipe

is inserted. In this position, there is a small gap between the

screw cap and connector body.

26�03�01�0693

1

1 Gap between screw cap and connector body

 Always use a pipe cutter to trim the pipe.

 Push the deburred pipe past the O-ring into the connec-

tor as far as it will go.

 Tighten the screw cap fully to the casing. This presses the

O-ring against the pipe and locks the connector.

26�03�01�0693

Pipe Ø 28 mm

Depth of insertion A 44 mm

Releasing the connection

26�03�01�0693

 Undo the screw cap until a small gap appears.

 Press the retainer back with your ngers and hold on to it.

The pipe can now be pulled out again.

3.3 Installing the heat source system

Size the heat source circuit pump (well pump) for the heat

source system according to the system-specic conditions

(see chapter “Specication / Sizing table”).

!

Appliance damage

The groundwater temperature differential between

the heat source flow and return must be ≤ 3 K.

Note

The heat exchanger should only be operated in coun-

tercurrent (see chapter “Specication / Standard cir-

cuits”).

 Install a non-return valve above the source circuit pump.

 Fill the heat source system. Make sure there are no leaks.

GWS | 21

ENGLISH

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 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 specied limits is exceeded, operation of the

groundwater station is not permissible.

To prevent blockage of the heat exchanger caused by solid

particles transported with the groundwater (sand, ne sludge,

etc.), install a suitable dirt lter with a mesh size of 0.6mm on

site at the heat source ow. You can obtain a suitable dirt lter

via your contractor or from us as a spare part. Install appropri-

ate pre-lters and settlement basins if higher levels of solid

particles are transported with the groundwater.

 After lling, vent the heat source system.

Adjust the heat source ow rate so that the brine ow rate at

the brine/water heat pump always corresponds to the required

values.

Note

Read and observe the operating and installation in-

structions for the brine/water heat pump and the di-

agrams in chapter “Specication”.

3.4 Insulation

To avoid condensate and therefore damage to the heat source

system and the brine circuit, insulate them with diusion-proof

material.

 Also insulate the drain & ll valve, the air vent valve and

the brine pressure switch.

26�03�14�0101�

 Fit the insulation hoses as shown in the diagram above.

1

3

2

26�03�14�0098�

1 Lower shell

2 Upper shell

3 Clip

 After insulation, t the upper shell on the groundwater

station.

 Secure the upper shell to the lower shell using the clips

provided.

4. Commissioning

 Move the levers of the 3-way ball valves to the throughput

position.

 Check the system pressure in the brine circuit. The system

must have overpressure of at least 0.1 MPa.

 With the “Relay test” parameter on the heat pump man-

ager, check the functioning of the well and brine circuit

pump.

 Read the heat source temperature o the heat pump

manager under the “Info temperatures” parameter and

check the plausibility of this value.

 Check the “SOURCE MIN” (minimum source temperature)

and “SOURCE” settings on the heat pump manager.

 Commission the brine/water heat pump.

The groundwater station temperature dierential between

the heat source inlet and the heat source outlet should be no

higher than 3K.

The temperature dierential ∆ϕ1 in the heat source circuit

must be greater than the temperature dierential ∆ϕ2 in the

brine circuit.

22 | GWS

INSTALLATION

Appliance handover

Examples:

7 °C

4 °C

2 °C

Δϕ1

Δϕ2

26�03�14�0121�

10 °C

7 °C

5 °C

Δϕ1

Δϕ2

26�03�14�0121�

Note

The groundwater station should only be commis-

sioned if there is a sucient ow rate on the heat

source side.

Also observe the ow rate pressure drop diagrams in chapter

“Specication”.

 Check that the hydraulic connection has been carried out

correctly.

5. Appliance handover

Make the user familiar with the appliance and hand them this

manual for safekeeping.

6. Cleaning, care and

maintenance

A damp cloth is sucient for cleaning the casing. Never use

abrasive or solvent-based cleaning agents.

6.1 Maintenance

Note

Switch the heat pump o before carrying out main-

tenance work.

The groundwater station heat exchanger must be ushed on

the source side as required. For this, proceed as follows:

 Remove the upper shell of the insulation from the

groundwater station.

To open the heat exchanger, proceed as follows:

1

3

2

1

3

2

26�03�14�0100�

1 Screw cap

2 3-way ball valve with ushing facility

3 Lever

 Remove screw caps from connectors.

 Connect ushing unit.

 Turn 3-way ball valve levers forward 90°.

 Flush heat exchanger with a formic acid/water mixture

with 5 %Vol formic acid.

 Then ush heat exchanger with clean water. For this, use

15x the volume of the content on the heat source side.

 Turn 3-way ball valve levers 90° to the right so they are

back in line with the direction of ow.

 Remove ushing unit.

 Ret screw caps on connectors.

 Ret upper shell on groundwater station.

 Secure the upper shell to the lower shell using the clips

provided.

 Check that the insulation is diusion-proof.

GWS | 23

ENGLISH

INSTALLATION

Specication

7. Specication

7.1 Dimensions and connections

Heat exchanger with heat source inlet on left

630

644

188

442

73

110

534

82

548

68

82

548

68

145

68

225

d47

d46

f01

f02

d02

d01

D0000017273.ai

d01 Heat pump ow

d02 Heat pump return

d46 Ventilation

d47 Drain

f01 Heat source inlet

f02 Heat source outlet

24 | GWS

INSTALLATION

Specication

Heat exchanger with heat source inlet on right

630

644

188

442

73

110

534

82

548

68

82

548

68

145

68

225

d47

d46

f01

f02

d02

d01

D0000017274.ai

d01 Heat pump ow

d02 Heat pump return

d46 Ventilation

d47 Drain

f01 Heat source inlet

f02 Heat source outlet

7.1.1 Flow rate pressure drop diagrams

As there is little divergence, the pressure drop curves in the

diagrams apply to both the heat source and brine sides (eth-

ylene glycol/water mixture with 25 % by vol. ethylene glycol).

GWS 1

0 1 2 3 4

0

100

200

300

400

500

84�03�14�0008�

X Flow rate [m³/h]

Y Pressure drop [hPa]

GWS 2

0 1 2 3 4 5 6 7

0

100

200

300

400

500

600

84�03�14�0009�

X Flow rate [m³/h]

Y Pressure drop [hPa]

GWS | 25

ENGLISH

INSTALLATION

Specication

7.2 Standard circuits

Heat pump WPF M with underoor heating system

WM1-0-1-0-0-0-1

1 Heat pump

2a Outside temperature sensor

2g Heat source sensor

3 Brine circuit pump

3a Heating circuit pump

3.1 Well pump

5 Safety valve

6 Expansion vessel

8 Pressure hose (anti-vibration mount)

10 Drain & ll valve

31 Overow valve

36 Safety temperature sensor for underoor heating system

39 Dirt lter

26 | GWS

INSTALLATION

Specication

Wiring diagram for heat pump WPF M with underoor heating system

E-WM1-0-1-0-0-0-1

GWS | 27

ENGLISH

INSTALLATION

Specication

Heat pump WPF E with underoor heating system

WE1-0-1-0-0-0-1

2 Heat pump manager

2a Outside temperature sensor

3 Brine circuit pump

3a Heating circuit pump

3.1 Well pump

5 Safety valve

6 Expansion vessel

8 Pressure hose (anti-vibration mount)

10 Drain & ll valve

22 Diverter valve

23 Electric emergency/booster heater

31 Overow valve

36 Safety temperature sensor for underoor heating system

39 Dirt lter

28 | GWS

INSTALLATION

Specication

Wiring diagram for heat pump WPF E with underoor heating system

E-WE1-0-1-0-0-0-1

GWS | 29

ENGLISH

INSTALLATION

Specication

7.3 Sizing table

Heat pump type Heat exchanger sizing data Groundwater module Circulation pump

Temperature °C Flow rate m³/h Cooling capacity kW* Δp [hPa]

Heat source

circuit

Brine circuit Heat source

circuit

Brine circuit Heat source

circuit

Brine circuit TYPE Brine circuit

WPF 5 10 > 7 5 < 7 1.7 2.5 5.8 124 280 GWS 1 integrated

WPF 7 10 > 7 5 < 7 2.1 3.1 7.2 192 431 GWS 1 integrated

WPF 10 10 > 7 5 < 7 2.9 4.3 10.0 370 832 GWS 1 integrated

WPF 13 10 > 7 5 < 7 3.6 5.4 12.5 193 433 GWS 2 integrated

WPF 16 10 > 7 5 < 7 4.6 6.9 16.1 319 719 GWS 2 integrated

WPW 7 E SET 10 > 7 5 < 7 1.7 2.5 5.8 124 280 GWS 1 integrated

WPW 10 E SET 10 > 7 5 < 7 2.1 3.1 7.2 192 431 GWS 1 integrated

WPW 13 E SET 10 > 7 5 < 7 2.9 4.3 10.0 370 832 GWS 1 integrated

WPW 18 E SET 10 > 7 5 < 7 3.6 5.4 12.5 193 433 GWS 2 integrated

WPW 22 E SET 10 > 7 5 < 7 4.6 6.9 16.1 319 719 GWS 2 integrated

WPF 5 basic 10 > 7 5 < 7 1.6 2.4 5.6 116 261 GWS 1 UP30/1-8E

WPF 7 basic 10 > 7 5 < 7 2.2 3.3 7.6 214 480 GWS 1 UP30/1-8E

WPF 10 basic 10 > 7 5 < 7 2.8 4.1 9.6 341 767 GWS 1 UP30/1-8E

WPF 13 basic 10 > 7 5 < 7 3.7 5.5 12.9 205 461 GWS 2 UPF40/1-8E

WPF 16 basic 10 > 7 5 < 7 4.5 6.8 15.8 308 692 GWS 2 UPF40/1-8E

WPW 7 basic SET 10 > 7 5 < 7 1.6 2.4 5.6 116 261 GWS 1 UP30/1-8E

WPW 10 basic SET 10 > 7 5 < 7 2.2 3.3 7.6 214 480 GWS 1 UP30/1-8E

WPW 13 basic SET 10 > 7 5 < 7 2.8 4.1 9.6 341 767 GWS 1 UP30/1-8E

WPW 18 basic SET 10 > 7 5 < 7 3.7 5.5 12.9 205 461 GWS 2 UPF40/1-8E

WPW 22 basic SET 10 > 7 5 < 7 4.5 6.8 15.8 308 692 GWS 2 UPF40/1-8E

WPF 10 M 10 > 7 5 < 7 2.8 4.1 9.6 341 767 GWS 1 UP30/1-8E

WPF 13 M 10 > 7 5 < 7 3.7 5.5 12.9 205 461 GWS 2 UPF40/1-8E

WPF 16 M 10 > 7 5 < 7 4.7 7.1 16.5 335 755 GWS 2 UPF40/1-8E

WPF 20 10 > 7 5 < 7 6.2 9.2 21.5 570 1282 GWS 2 UPF40/1-8E

WPF 20 SET 10 > 7 5 < 7 5.5 8.3 19.2 454 1022 GWS 2 UPF40/1-8E

* at B+7 / W+35

7.4 Data table

GWS 1 GWS 2

230659 230660

Application limits

Max. application limit, heat source °C 20 20

Min. application limit, heat source °C 7 7

Max. permissible pressure MPa 0.3 0.3

Dimensions

Height mm 630 630

Width mm 640 640

Depth mm 230 230

Weights

Weight kg 20.5 26.5

Connections

Connection on the heat source side G 1 1/4 G 1 1/4

Heat pump connection 28 mm 28 mm

30 | GWS

GUARANTEE | ENVIRONMENT AND RECYCLING

Guarantee

The guarantee conditions of our German companies do not

apply to appliances acquired outside of Germany. In countries

where our subsidiaries sell our products a guarantee can only

be issued by those subsidiaries. Such guarantee is only grant-

ed if the subsidiary has issued its own terms of guarantee. No

other guarantee will be granted.

We shall not provide any guarantee for appliances acquired in

countries where we have no subsidiary to sell our products.

This will not aect warranties issued by any importers.

Environment and recycling

We would ask you to help protect the environment. After use,

dispose of the various materials in accordance with national

regulations.

GUARANTEE

ENVIRONMENT AND RECYCLING

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