STIEBEL ELTRON Wpf 20 Hoja de especificaciones

OPERATION AND INSTALLATION

BRINE/WATER HEAT PUMPS

»WPF20

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General instructions

The chapter Operation is intended for the equipment user and the

heating contractor.

The chapter Installation is intended for the heating contractor.

The heat pump installation also requires the WPM II heat pump

manager operating instructions.

Subject to the relevant system, also observe the operating and

installation instructions of the components that are part of the

system.

Please read carefully!

Read these instructions carefully before using the unit

and retain them for future reference. If the device

is passed on to a third party please hand these

instructions to the new user.

Key

Symbols in these installation instructions:

In this documentation you will come across symbols and highlights

that are deﬁned as follows:

!Danger to life through electrocution!

!Risk of damage!

Information regarding potential situations that bring

a risk with them that might occur during the device

installation or operation, the consequences of which

may be equipment damage, environmental pollution

or material loss.

» The "»" symbol indicates that you have to do something. The

action you need to take is described step by step.

General instructions__________________________________________________2

Key ___________________________________________________________________________ 2

OPERATION _____________________________________________ 2

1 Safety ____________________________________________________________3

1.1 Correct use___________________________________________________________ 3

1.2 Safety instructions _________________________________________________ 3

1.3 CE designation ______________________________________________________ 3

2 Device description ______________________________________________3

2.1 Operational characteristics _______________________________________ 3

2.2 Function ______________________________________________________________ 3

3 Control __________________________________________________________3

4 Maintenance and care__________________________________________3

5 What to do if... _________________________________________________3

INSTALLATION __________________________________________ 4

6 Safety ____________________________________________________________4

6.1 Instructions, standards and regulations, CE __________________ 4

7 Device description ______________________________________________5

7.1 Standard delivery___________________________________________________ 6

7.2 Accessories __________________________________________________________ 6

8 Installation ______________________________________________________6

8.1 Transport_____________________________________________________________ 6

8.2 Positioning___________________________________________________________ 6

8.3 Installation of the heat pump system __________________________ 9

8.4 Installation of the heat consumer system ____________________ 10

8.5 Fitting the casing parts___________________________________________ 12

8.6 Removing the casing parts ______________________________________ 13

8.7 Power supply _______________________________________________________ 14

8.8 Modules _____________________________________________________________ 14

9 Commissioning________________________________________________ 16

9.1 Operation and control ___________________________________________ 16

10 Maintenance___________________________________________________ 16

11 Troubleshooting_______________________________________________ 17

12 Speciﬁcation___________________________________________________ 19

12.1 Standard control___________________________________________________ 19

12.2 Wiring diagrams___________________________________________________ 20

12.4 Output diagrams ____________________________________________ 24

13 Commissioning report________________________________________ 29

GUARANTEE____________________________________________ 35

ENVIRONMENT AND RECYCLING______________________ 35

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CONTENT | CONTROL

GENERAL INSTRUCTIONS | KEY

1 Safety

1.1 Correct use

This device is exclusively designed for heating water heating. Any

other or additional use is inappropriate, in particular the heating

of alternative media. The correct use also includes the observation

of the operating and installation instructions. Only use the device

for the purpose stated by the manufacturer and never change or

convert the device in any way!

1.2 Safety instructions

Observe the following safety information and instructions.

The electrical installation and installation of the refrigerant circuit

must only be carried out by a recognised, qualiﬁed contractor or

by qualiﬁed Stiebel Eltron customer service engineers.

The recognised contractor is responsible for adherence to

all currently applicable instructions during installation and

commissioning.

Operate this device only if it is fully installed and all safety

equipment is ﬁtted.

!Danger to life through electrocution!

Never spray the device with water or other liquids.

!Risk of damage!

Prior to maintenance work, isolate the device from its

power supply.

Where children or persons with limited physical, sensory or mental

capabilities are to be allowed to control this equipment ensure

that this will only happen under supervision or after appropriate

instructions by a person responsible for their safety. Children

should be supervised to ensure that they do not play with the

equipment.

1.3 CE designation

The CE designation shows that the device meets all the essential

requirements:

— Electrical Compatibility Directive (2004/108/EC)

— Low Voltage Directive (2006/95/EC)

— Pressure Equipment Directive (97/23/EC)

The rating plate is located at the back of the heat pump.

2 Device description

2.1 Operational characteristics

The WPF is a heating heat pump designed as brine/water heat

pump. The heat pump extracts energy from the heat source

medium, i.e. brine, at a low temperature level. This extracted

energy is then transferred to the heating water at a higher

level, enriched with the energy drawn by the compressor.

Subject to the heat source temperature, the heating water can be

heated up to a ﬂow temperature of 60 °C.

A modular operation is possible with the WPF.

2.2 Function

The heat source medium (brine) enters the heat pump evaporator.

There, heat is extracted from the medium, so it exits the heat

pump at a lower temperature.

The energy made useful through the heat pump is transferred to

the heating water inside the condenser.

Then, the heating water transfers its energy to the heating

circuit.

3 Control

The heat pump is exclusively controlled by the heat pump manager

WPM II. Therefore, observe the instructions in the chapter Operation

in the operating and installation instructions of the heat pump

manager WPM II.

4 Maintenance and care

!Risk of damage!

Maintenance work, such as checking the electrical

safety, must only be carried out by a qualified

electrician. Protect the equipment from dust and dirt

ingress during building work.

A damp cloth is sufﬁcient for cleaning all plastic and sheet steel

parts. Do not use abrasive or corrosive cleaning agents!

!Risk of damage!

Check the refrigerant circuit of the heat pump annually

for tightness in accordance with EU Directive 842/2006.

5 What to do if...

. . . there is no hot water or the heating system remains cold:

Check the fuse/circuit breaker in your fuse box. If it has blown/

tripped, replace/reset the fuse/MCB. Notify your local contractor

if the fuse/MCB blows/trips again.

Notify your local contractor in case of all other faults.

OPERATION

SAFETY | DEVICE DESCRIPTION | CONTROL | MAINTENANCE AND CARE

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6 Safety

6.1 Instructions, standards and regulations, CE

On the water side:

DIN EN12828: Safety equipment for hot water heating systems

TRD 721: Safety equipment to prevent excess pressure – safety

valves.

On the electrical side:

DIN VDE 0100: Regulations for the installation of HV systems with

rated voltages up to 1000 V.

VDE 0701: Regulations regarding the repair, modiﬁcation and

testing of used electrical equipment.

DIN-EN 60335 part 2-40

TAB: Technical connection conditions for connection to the

LV mains.

On the refrigerant side:

EN 378: Safety and environmental requirements.

DIN 7003 (draft version)

General:

Collation of technical requirements for boiler rooms, e.g. Boiler

Room Directives or national/local Building Regulations, commercial

and ﬁre as well as emission control regulations and requirements,

or local regulations.

TA-Lärm: Techn. noise protection regulations [Germany].

EnEV: Energy Savings Order [Germany]

The CE designation shows that the device meets all the essential

requirements: The rating plate is located at the back of the heat

pump.

INSTALLATION

SAFETY

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7 Device description

A Equipment layout

C26_03_01_1318

C26_03_01_0797

WPF 40, 52, 66

WPF 20, 27

1 Condenser

2 Evaporator

3 Sight glass

4 High pressure limiter

5 Low pressure sensor

6 Motor protection switch (only for WPF 52 and 66)

7 Filter dryer

8 Expansion valve

9 Compressor

10 Fill & drain valve (heating)

11 Fill & drain valve (brine)

12 Phase monitoring relay

13 Electrical terminals

14 Starting current limiter

15 High pressure sensor

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INSTALLATION

EQUIPMENT LAYOUT

7.1 Standard delivery

Heat pumps are delivered in two shipping units.

Designation Part no.

Standard heat pump device

Casing parts 223384

7.2 Accessories

Designation Part no.

Heat pump manager with wall mounting enclosure, WPMW II 185450

Heat pump manager as control panel mounted version, WPMS II 185451

Mixer module with wall mounting enclosure, MSMW 074012

Mixer module as control panel mounted version, MSMS 074011

Cylinder SBP 700 E 185459

Cylinder SBP 700 E SOL 185460

Kit WPVB 227760

Heating system remote control FE 7 185579

Contact sensor AVF 6 165341

Immersion sensor TF 6 165342

Heat transfer medium (concentrate) (30 litre can) 161696

8 Installation

8.1 Transport

To protect the equipment against damage, transport it vertically

inside its packaging. Storage and transport at temperatures below

– 20 °C and in excess of + 50 °C are not permissible.

In the top of the frame are four holes for ﬁtting lifting eyes M 12

where the equipment can be lifted.

The casing parts are delivered in a separate package, and these

are ﬁtted to the device at the place of installation.

8.2 Positioning

8.2.1 General

Level the device horizontally by adjusting the equipment feet.

To prevent the heat pump from being damaged by frost in case of

external installation, ﬁt and electrically connect the contact sensor

AVF 6 (part no.: 165341) into the heating return as frost protection.

Electrical connection and sensor installation, see chapter 9.

Maintain the following minimum clearances to adjacent

surfaces:

— to the sides 300 mm

— in front 1500 mm

— upwards 100 mm

— The clearance to the back is subject to the installation and

installation location.

8.2.2 External installation

We recommend foundations as base for the device

(see Fig. D)

Route all supply lines inside a conduit that is free from frost

(protective pipe).

Protect the connection area at the back panel against all weather

and solar inﬂuences.

8.2.3 Internal installation

The room where the WPF is to be installed must meet the following

conditions:

—Load-bearing floor. For the weight of the WPF, see

"Speciﬁcation".

— For a quiet heat pump operation on ﬂoating screeds, recess the

screed and the anti-vibration insulation around the installation

location

(see Fig. C)

of the heat pump.

— The room must not be subject to a risk of explosions arising

from dust, gases or vapours. Never allow the ﬂoor area and the

volume of the installation room to be less than the minimum

values listed in the table.

Type Volume Floor area

WPF 20 14 m³ 5 m²

WPF 27 16 m³ 7 m²

WPF 40 23 m³ 9 m²

WPF 52 28 m³ 11 m²

WPF 66 33 m³ 13 m²

— When installing the WPF in a boiler room together with other

heating equipment ensure, that the operation of other heating

equipment will not be impaired.

8.2.4 Sound emission.

Never install the heat pump immediately below or adjacent to

bedrooms. Insulate pipes through walls and ceilings against

structure-borne noise transmission.

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INSTALLATION

B Dimensions

C26_03_01_0867

C Plinth for internal installation

C26_03_01_0802

1 Concrete ceiling

2 Impact sound insulation

3 Floating screed

4 Recess

D Foundation for external installation

C26_03_01_0803

INSTALLATION

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E Water and brine connection

C26_03_01_0866

1 Heating ﬂow

2 Heating return

3 Brine ﬂow

4 Brine return

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INSTALLATION

8.3 Installation of the heat pump system

Design the heat source system for the brine/water heat pump in

accordance with Stiebel Eltron technical guides.

Permitted brine:

— Ethylene glycol

— Propylene glycol

— Heat transfer medium as concentrate part no.: 161696

— Heat transfer medium as ready-mixed solution part no.:

185472

When using the heat transfer medium with part no.: 185472, never

seal the heat source system with hemp.

8.3.1 Circulation pump and required ﬂow rate

Use a circulation pump with compound-ﬁlled windings to supply

the brine, to prevent an earth short circuit through condensation

in the electrical part of the pump (cold water version).

Size the circulation pump in accordance with the system-speciﬁc

conditions, i.e. nominal ﬂow rate and pressure drop must be taken

into consideration (see "Speciﬁcation").

An adequate ﬂow rate must be safeguarded at every possible

brine temperature, i.e.:

Size the nominal ﬂow rate at brine temperature 0 °C with a

tolerance of + 10 %.

8.3.2 Connection and ﬁlling with brine

Prior to connecting the heat pump, check the heat source circuit

for possible leaks, and ﬂush thoroughly.

Calculate the volume of the heat source circuit. You can obtain

the brine volume inside the heat pump from the "Speciﬁcation"

table.

The overall volume equals that of the required amount of brine

that should be mixed

from 33 % by vol. undiluted ethylene glycol

and 67 % by vol. water.

Mix 1 unit of undiluted ethylene glycol with 2 units of water

(max. chloride content of the water 300 ppm) and then ﬁll into

the system.

Check the brine concentration:

Determine the density of the ethylene glycol water mixture (e.g.

with an hydrometer). Using the density and temperature, the

current level of concentration can be checked in the diagram

(see

Fig. F)

F Density Uof ethylene glycol water mixtures of various

concentrations

C26_03_01_0833

{= Frost protection

!Risk of damage!

The quoted output details refer to ethylene glycol.

These output details vary slightly when using

propylene glycol.

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INSTALLATION

1.130

1.120

1.110

1.100

1.090

1.080

1.070

1.060

1.050

1.040

1.030

1.020

1.000

0.990

0.980

1.010

8.3.3 Checking the ﬂow rate (during heat pump commissioning)

Check the ﬂow and return temperatures of the heat source. For

this, determine the temperature differential by measuring the

temperature under the thermal insulation on both ﬂow and

return pipes of the heat pump. The diagram (Fig. G) shows the

temperature spread at the nominal ﬂow rate.

!Risk of damage!

At the WPM II, set parameter 12 (source) in the

commissioning list to "Ethylene glycol", otherwise the

frost stat would stop the heat pump at temperatures

below 7 °C. The source inlet temperature can be

checked on the display of the WPM II under the Info

Temp. system parameter.

G Temperature spread at nominal ﬂow rate

C26_03_01_0834

A Brine = heating ﬂow 35 °C

B Brine = heating ﬂow 50 °C

T1 Temperature differential

T2 Source inlet temperature

8.4 Installation of the heat consumer system

8.4.1 Implement the heat consumer system (heating circuit)

in accordance with current technical rules. For safety equipment

in heating systems, consult the DIN EN 12828.

Protect the heating water lines against frost and moisture (only

in case of external installation). Protect ﬂow and return lines

in external installations with an adequate amount of thermal

insulation against frost and by routing them inside a conduit

against moisture

(see Fig. D).

Maintain the required insulation thickness in accordance with the

Heating System Order [or local regulations].

The integral frost protection control (inside the heat pump), that

automatically starts the circulation pump in the heat pump circuit

at + 8 °C and thereby safeguards circulation in all water-bearing

components, offers additional frost protection. The heat pump is

started automatically no later than when the temperature inside

the buffer cylinder drops below + 5 °C.

Prior to connecting the heat pump, check the heating system for

leaks, ﬂush it thoroughly, ﬁll and carefully vent it.

When ﬁlling the system with heating water, observe VDI 2035,

sheet 1 [or local regulations]. In particular, this means that

— during the service life of the system, the total of the ﬁll and

top-up water must not exceed three times the nominal volume

of the heating system,

— the total alkaline earths in the water must be < 3.0 mol/m³,

— the total water hardness must be < 3 mmol/l. Soften the water,

if the above conditions are not met.

Generally soften the heating water, if the speciﬁc system volume

> 20 l/kW output (e.g. systems with buffer cylinder).

Ensure the correct connection of the heating ﬂow and return.

Fit the thermal insulation in accordance with local regulations

appertaining heating systems.

8.4.2 Buffer cylinder

A buffer cylinder is recommended to ensure a trouble-free heat

pump operation. The buffer cylinder provides hydraulic separation

of the volume ﬂow in the heat pump circuit and the heating circuit.

The ﬂow rate in the heat pump remains constant if, for example,

the ﬂow rate in the heating circuit is reduced by thermostatic

valves.

8.4.3 Circulation pump (cylinder primary pump)

When using a buffer cylinder, observe the pressure drop of the

evaporator, of the connecting lines, bends, valves etc. in sizing the

circulation pump to be installed.

8.4.3 Circulation pump (heating circuit pump)

Where no buffer cylinder is used, size the circulation pump on the

heating side taking the condenser pressure drop into consideration.

The ﬂow rate at 'T = 10 K (see "Speciﬁcation") of the heat pump

must be assured under all operating conditions of the heating

system through the installation of an overﬂow valve.

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INSTALLATION

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