Stiebel eltron WPL 25 A, WPL 20 A, WPL 25 AS, WPL 20 AC, WPL 25 ACS User Manual

OPERATION AND INSTALLATION

Air | water heat pump

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CONTENTS

SPECIAL INFORMATION OPERATION

1. General information 3

1.1 Safety instructions 3

1.2 Other symbols in this documentation 4

1.3 Units of measurement 4

1.4 Standardised output data 4

2. Safety 4

2.1 Intended use 4

2.2 Safety instructions 4

3. Appliance description 5

3.1 Properties 5

3.2 Function 5

4. Settings 5

5. Maintenance and care 6

6. Troubleshooting 6

INSTALLATION

7. Safety 7

7.1 General safety instructions 7

7.2 Instructions, standards and regulations 7

8. Appliance description 7

8.1 Standard delivery 7

8.2 Accessories 7

9. Preparations 7

9.1 Sound emissions 7

9.2 Minimum clearances 8

9.3 Preparation of the installation location 8

9.4 Siting 8

9.5 Installing supply lines and supply cables 10

9.6 WPM heat pump manager 10

9.7 Buffer cylinder 10

9.8 Preparing the electrical installation 11

10. Installation 11

10.1 Handling 11

10.2 Siting 11

10.3 Heating water connection 11

10.4 Flow and return connection 12

10.5 Fitting the push-fit connector 12

10.6 Oxygen diffusion 13

10.7 Filling the heating system 13

10.8 Minimum flow rate 13 10.9 Setting the flow rate on the heating side 13 10.10 Condensate drain 15 10.11 External second heat generator 15

10.12 Safety temperature controller for underfloor heating system STB-FB 15

11. Power supply 15

11.1 Power connection WPL 15 AS | WPL 15 ACS 17

11.2Power connection WPL 20 A | WPL 20 AC | WPL 25 A |

WPL 25 AC 17 11.3 Power connection WPL 25 AS | WPL 25 ACS 18

11.4Electrical connection of supplementary heating facility 18

12. Commissioning 20

12.1 Checks before commissioning 20

12.2Using the appliance with an external second heat

generator 20 12.3 Settings 20 12.4 Operation and control 21 12.5 Decommissioning 21

13. Maintenance 21

14. Troubleshooting 22

14.1 Checking the IWS DIP switch settings 22

14.2 Light emitting diodes (LEDs) 23

14.3 Reset button 24 14.4 Resetting the high limit safety cut-out 24 14.5 Fan noise 24

15. Specification 26

15.1 Dimensions and connections 26

15.2Wiring diagram for WPL 15 AS | WPL 15 ACS |

WPL 25 AS | WPL 25 ACS (single-phase) 28

15.3Wiring diagram for WPL 20 A | WPL 20 AC | WPL 25 A |

WPL 25 AC (3-phase) 30 15.4 Output diagrams WPL 15 AS | WPL 15 ACS 32 15.5 Output diagrams WPL 20 A | WPL 20 AC 34

15.6Output diagrams WPL 25 A | WPL 25 AC | WPL 25 AS |

WPL 25 ACS 36 15.7 Data table 38

GUARANTEE

ENVIRONMENT AND RECYCLING

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SPECIAL INFORMATION | OPERATION

General information

SPECIAL INFORMATION OPERATION

-- The appliance may be used by children aged 8 and up and persons with reduced physical, sensory or mental capabilities or a lack of experience and know-how provided that they are supervised or they have been instructed on how to use the appliance safely and have understood the resulting risks. Children must never play with the appliance. Children must never clean the appliance or perform user maintenance unless they are supervised.

-- Use a permanent connection to the power supply. The appliance must be able to be separated from the power supply by an isolator that disconnects all poles with at least 3 mm contact separation.

-- Maintain the minimum clearances to ensure trou- ble-free operation of the appliance and facilitate maintenance work.

-- Maintenance work, such as checking the electrical safety, must only be carried out by a qualified contractor.

-- We recommend an annual inspection (to establish the system’s current condition), and maintenance by a qualified contractor if required (to return the system to the desired condition).

-- Following isolation from the mains supply, parts of the appliance may remain live for up to 2 minutes since the capacitors still have to discharge into the inverter.

-- Never interrupt the power supply, even outside the heating period. The system’s active frost protection is not guaranteed if the power supply is interrupted.

-- If the heat pump and frost protection are completely switched off, drain the system on the water side.

1.General information

The chapters “Special Information” and “Operation” are intended for both the user and qualified contractors.

The chapter "Installation" is intended for qualified contractors.

Note

Read these instructions carefully before using the appliance and retain them for future reference.

Pass on the instructions to a new user if required.

1.1Safety instructions

1.1.1 Structure of safety instructions

KEYWORD Type of risk

! Here, possible consequences are listed that may result from failure to observe the safety instructions. ffSteps to prevent the risk are listed.

1.1.2 Symbols, type of risk

Symbol		Type of risk
!		Injury
		Electrocution

1.1.3 Keywords

KEYWORD	Meaning
DANGER	Failure to observe this information will result in serious
	injury or death.
WARNING	Failure to observe this information may result in serious
	injury or death.
CAUTION	Failure to observe this information may result in non-seri-
	ous or minor injury.

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OPERATION

Safety

1.2Other symbols in this documentation

Note

General information is identified by the symbol shown on the left.

ffRead these texts carefully.

Symbol Meaning

Material losses

! (appliance and consequential losses, environmental pollution)

Appliance disposal

2.Safety

2.1Intended use

Observe the application limits listed in chapter "Specification / Data table".

This appliance is intended for domestic use. It can be used safely by untrained persons. The appliance can also be used in a non-do- mestic environment, e.g. in a small business, as long as it is used in the same way.

Any other use beyond that described shall be deemed inappropriate. Observation of these instructions and of instructions for any accessories used is also part of the correct use of this appliance.

ffThis symbol indicates that you have to do something. The action you need to take is described step by step.

1.3Units of measurement

Note

All measurements are given in mm unless stated otherwise.

1.4Standardised output data

Explanations to determine and interpret the specified standardised output data.

1.4.1 EN 14511

The output data specifically mentioned in text, diagrams and technical datasheets has been calculated according to the test conditions of the standard shown in the heading of this section. However, there is a deviation from this norm in the output data for air/water inverter heat pumps at source temperatures of > -7 °C as this concerns partial load values. The associated percentage weighting in the partial load range can be found in EN 14825 and EHPA quality label regulations.

Generally, the test conditions stated above will not fully meet the conditions found at the installation site of the system user.

Depending on the chosen test method and the extent to which this method deviates from the test conditions defined in the first paragraph of this section, any deviations can have a considerable impact.

Further factors that have an influence on the test values are the measuring equipment, the system configuration, the age of the system and the flow rates.

A confirmation of the specified output data can only be obtained if the test conducted for this purpose is also performed in accordance with the test conditions defined in the first paragraph of this section.

2.2Safety instructions

Observe the following safety instructions and regulations.

-- Only qualified contractors should carry out the electrical work and installation of this appliance.

-- The qualified contractor is responsible for adherence to all currently applicable instructions during installation and commissioning.

-- Operate the appliance only when fully installed and with all safety equipment fitted.

-- Protect the appliance from dust and dirt ingress during building work.

WARNING Injury

! The appliance may be used by children aged 8 and up and persons with reduced physical, sensory or mental capabilities or a lack of experience and know-how provided that they are supervised or they have been instructed on how to use the appliance safely and have understood the resulting risks. Children must never play with the appliance. Children must never clean the appliance or perform user maintenance unless they are supervised.

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OPERATION

Appliance description

3.Appliance description

3.1Properties

The appliance is a heating heat pump for outdoor installation that operates as an air | water heat pump. Heat is extracted from the outdoor air at a low temperature level, and is then transferred to the heating water at a higher temperature. The heating water can be heated up to a flow temperature of 65 °C.

The heat pump automatically reverts to heating mode at the end of the defrost cycle.

!Material losses

In dual mode operation, the return water of the second heat generator can flow through the heat pump. Please note that the return temperature must be no higher than 60 °C.

The appliance is equipped with an electric emergency/booster heater (DHC). If the dual mode point can no longer be maintained in mono mode operation, the electric emergency/booster heater is activated to safeguard heating operation and the provision of high DHW temperatures. In such cases, the electric emergency/booster heater is activated in mono energetic operation as a booster heater.

This appliance has further operational characteristics: -- Suitable for underfloor and radiator heating.

-- Preferred for low temperature heating systems.

-- Extracts heat from the outdoor air even at –20 °C outside temperature.

-- Corrosion-protected, external casing made from hot-dipped galvanised sheet steel plus stove-enamelled finish.

-- Comprises all components and safety equipment required for operation.

-- Filled with non-combustible safety refrigerant.

Note

For centralised control of the heating system you will need heat pump manager WPM.

3.2Function

3.2.1 Heating

Heat is extracted from the outdoor air via the heat exchanger (evaporator) on the air side. The evaporated refrigerant is compressed by a compressor. Electrical energy is necessary for this process. At this point, the refrigerant is at a higher temperature level. A further heat exchanger (condenser) transfers the heat to the heating circuit. During this process, the refrigerant expands, and the cycle restarts from the beginning.

At air temperatures below approx. +7 °C, the humidity in the air condenses as hoarfrost on the evaporator fins. Any hoarfrost is automatically defrosted. Water created by this process collects in the defrost pan and is drained off via a hose.

!Material losses

In the defrost cycle, the fan is switched off and the heat pump circuit is reversed. The heat required for defrosting is drawn from the buffer cylinder. For operation without a buffer cylinder, observe chapter „Operation / Menu structure / Menu SETTINGS / STANDARD SETTING / BUFFER OPERATION“ in the operating and installation instructions of the WPM. Otherwise the heating water freezes under unfavourable conditions.

3.2.2 Cooling

!Material losses

The heat pump is not suitable for continuous, year-round cooling.

ffObserve the application limits (see chapter “Specification / Data table”).

Rooms are cooled by reversing the heat pump circuit. Heat is extracted from the heating water and the evaporator transfers this heat to the outdoor air.

Area cooling requires the installation of the FEK remote control unit in a reference room to capture the relative humidity and the room temperature as part of monitoring the dew point.

Heat pump application limit

The heat pump is switched off if the outside temperature falls below the selected lower application limit for cooling (parameter LIMIT COOLING).

4.Settings

The system is operated exclusively by the WPM heat pump manager.

ffPlease observe the heat pump manager operating and installation instructions.

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OPERATION Maintenance and care

5.Maintenance and care

!Material losses

Maintenance work, such as checking the electrical safety, must only be carried out by a qualified contractor.

A damp cloth is sufficient for cleaning all plastic and sheet metal parts. Never use abrasive or corrosive cleaning agents.

6.Troubleshooting

Fault	Cause	Remedy
There is no hot	No power at the appliance.	Check the fuses/MCBs in
water or the heat-		your fuse box/distribution
ing system stays		panel. Replace the fuses/
cold.		reset the MCBs if required.
		Notify your qualified con-
		tractor if the fuses/MCBs
		blow/trip again.

Regularly check the condensate drain (visual inspection). Remove contamination and blockages immediately (see chapter "Installation / Condensate drain").

	1.
	2.
1	D0000037831

1 Inspection port

The external unit		The condensate drain may be		Clean the condensate drain
leaks water.		blocked.		as described in „Mainte-
				nance and care“.
This can cause the		The heat pump is drawing
humidity in the		heat from the outdoor air to
outdoor air to ac-		heat the building. This can
cumulate as dew or cause the humidity in the
frost on the cooled		outdoor air to accumulate as
heat pump casing		dew or frost on the cooled
		heat pump casing. This is not
		a defect.

Note

Even when the condensate is draining away correctly, expect water to drip from the appliance onto the floor.

If you cannot remedy the fault, notify your qualified contractor. To facilitate and speed up your enquiry, please provide the serial number from the type plate. The type plate is located at the front top, on the right or left hand side of the casing.

*

Sample type plate

!Material losses

Keep the air discharge and intake apertures free from snow and leaves.

We recommend an annual inspection (to establish the current condition of the system), and maintenance by a qualified contractor if required (to return the system to its original condition).

Protect the appliance from dust and dirt ingress during building work.

		*xxxxxxxxxxxxxxxxxx	1
Montageanweisung beachten! Dichtheit geprüft!	Made in Germany		03 01 1736
			26

1 Number on the type plate

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INSTALLATION

Safety

INSTALLATION

7.Safety

Only a qualified contractor should carry out installation, commissioning, maintenance and repair of the appliance.

7.1General safety instructions

We guarantee trouble-free function and operational reliability only if original accessories and spare parts intended for the appliance are used.

7.2Instructions, standards and regulations

Note

Observe all applicable national and regional regulations and instructions.

9.Preparations

The appliance is designed for siting in front of a wall. Observe the minimum clearances. If the appliance is installed in an open space or on a roof, protect the air intake side. Do this by erecting a wall to shield it against the wind.

9.1Sound emissions

The appliance is louder on the air intake and air discharge sides than on the two enclosed sides. Observe the following information when selecting the installation location.

Note

For details regarding the sound power level, see chapter "Specification / Data table".

-- Lawn areas and shrubs help reduce the spread of noise.

-- Sound propagation can also be reduced by installing closely spaced palisade fencing around the appliance.

ffEnsure that the air intake direction is the same as the main wind direction.

8.Appliance description

The appliance offers frost protection for the connection lines. The integral frost protection circuit starts the circulation pump in the heat pump circuit automatically at a condenser temperature of 8 °C, and thereby ensures circulation in all water-carrying sections. If the temperature inside the buffer cylinder drops, the heat pump starts automatically no later than when the temperature falls below +5 °C.

ffAir should not be blown out against the wind.

ffNever direct the air intake or discharge towards noise-sensi- tive rooms of the house, e.g. bedrooms.

ffAvoid installation on large, echoing floor areas, e.g. tiled floors.

ffAvoid installation between reflective building walls. Reflecting building walls can increase the sound level.

ffMaintain the minimum clearances to ensure trouble-free operation of the appliance and facilitate maintenance work.

8.1Standard delivery

The following are delivered with the appliance: -- Wiring diagram

8.2Accessories

8.2.1 Required accessories

-- Heat pump manager in wall mounting enclosure, WPM

8.2.2 Further accessories

-- Remote control for heating systems FEK -- Remote control for heating systems FE7 -- Ribbon heater HZB-1

-- Ribbon heater HZB-2

-- Safety temperature controller for underfloor heating system STB-FB

-- T-support SK-WPL

-- Wall mounting support WK 2 -- Mounting bracket MK 1

-- Connection set AS-WP 1 -- Connection set AS-WP 2

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INSTALLATION

Preparations

9.2 Minimum clearances

9.4 Siting

			Note
≥800			If the condensate drain hose is not laid with frost protec-
			tion or is exposed to severe weather conditions, instal-
			lation of a ribbon heater is recommended both with the
			plinth and the wall mounting support.
		9.4.1 Example: Pipe routing above ground or mounting
			bracket MK 1
		--	The substrate must be horizontal, level, solid and permanent.
		ffEnsure the entire appliance frame is in full contact with the
			substrate. Uneven substrates can increase noise emissions.
		If the supply lines are run downwards through the ground, they
		must be laid in a recess (space) in the foundation.
≥300		WPL 15 AS | WPL 15 ACS
				1
			3	1300
≥1000	≥500		140	200
				75
				4
			100	5
				410
≥2000			750
	D0000028299			2	D0000034133
		1	Air intake
		2	Air discharge
		3	Main wind direction
	00 0036	4	Supply line recess
		5	Condensate drain recess (minimum diameter 70 mm)
	00_	ffEnsure that the foundations offer the necessary recess.
	91

ffDo not install the appliance in a recess. Two sides of the appliance must remain exposed.

9.3Preparation of the installation location

ffObserve chapter “Sound emissions”.

ffEnsure that the appliance is accessible from all sides.

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INSTALLATION
Preparations
WPL 20 A | WPL 20 AC | WPL 25 A | WPL 25 AS | WPL 25 AC |
WPL 25 ACS
	1
3	1500
140	200
	75
	4
100	5
	410
750
	2	D0000028298

1Air intake

2Air discharge

3Main wind direction

4Supply line recess

5Condensate drain recess (minimum diameter 70 mm)

ffEnsure that the foundations offer the necessary recess.

Example: Laying pipes above ground

5
2	1
A
B	3
C
	4
6	D0000028297

A100

B300

CDepth of frost line 1 Heating flow

2 Heating return

3 Condensate drain

4 Condensate drain pipe

5 Foundation

6 Gravel bed

Note

The transport brackets can be used to secure the appliance to the foundations.

D0000064201

ffHook two brackets respectively into the lateral slots on the front and back. Ensure you are using the correct brackets for the left and right hand slots respectively.

ffPosition the brackets so that the groove on the bracket is hooked into the appliance.

ffSecure the appliance to the foundations using the brackets and suitable rawl plugs and screws.

Note

ffDo not use the screws with which the appliance was secured to the transport pallet.

Example: Mounting bracket MK 1 (only WPL 15 AS | WPL 15 ACS)

Note

The mounting bracket cannot be used in combination with the connection sets (AS-WP 1 and AS-WP 2).

	4	5
		1
1	2	8
	A

3

7

6	D0000060818

A Depth of frost line

1Heating flow

2Heating return

3Conduit for supply lines

4Foundation

5Mounting support

6Gravel bed

7Drainage pipe

8Condensate drain

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INSTALLATION

Preparations

9.4.2 Example: T-support SK-WPL

1	2	B		8	5
		A
		3	7		D0000050006
		6
		4

ADepth of frost line

B300

1Heating flow

2Heating return

3Conduit for supply lines/cables

4Foundation

5T-support

6Gravel bed

7Drainage pipe

8Condensate drain

9Cover

ffObserve the static limits of the T-support used.

9.4.3 Example: Wall mounting support WK 2

		≥300
	3	5
1		D0000058719
2	4

1Heating flow

2Heating return

3Condensate drain

4Drainage pipe

5Wall mounting bracket

ffObserve the static limits of the wall mounting support used.

Note

To prevent disturbance due to structure-borne noise transmission, never install the wall mounting bracket on the external walls of living areas or bedrooms. ffInstall the wall mounting bracket, for example, on a

garage wall.

9.5Installing supply lines and supply cables

The supply lines are all electric cables plus the heating flow and return lines.

ffUse only weather-resistant cables, e.g. NYY.

ffProtect the flow and return lines against frost, with sufficient thermal insulation. Provide the thermal insulation in accordance with applicable regulations.

ffAlso protect all supply lines/cables against humidity, damage and UV radiation by means of a conduit.

ffProtect the supply lines and cables routed through the ground from moisture and damage by routing them through a conduit.

ffProtect all pipe fixings and outer wall transitions with an- ti-vibration insulation.

Note

When routing the condensate hose, observe chapter "Installation / Condensate drain".

9.6WPM heat pump manager

A WPM heat pump manager is required to operate the appliance. This controls the entire heating system.

9.7Buffer cylinder

A buffer cylinder is recommended to ensure trouble-free appliance operation.

The buffer cylinder provides hydraulic separation of the volume flows in the heat pump circuit and heating circuit, and also serves as an energy source for defrosting.

ffWhen operating without a buffer cylinder, observe the details specified in chapter „Minimum flow rate with individual room controller by means of FEK / FE7 in the case of systems without buffer cylinder“.

!A buffer cylinder with diffusion-proof insulation is essential for cooling mode.Material losses

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INSTALLATION

Installation

9.8Preparing the electrical installation

WARNING Risk of electrocution!

Carry out all electrical connection and installation work in accordance with national and regional regulations.

WARNING Risk of electrocution!

Use a permanent connection to the power supply. The appliance must be able to be separated from the power supply by an isolator that disconnects all poles with at least 3 mm contact separation. This requirement can be met by contactors, isolators, fuses, etc.

!Material losses

The specified voltage must match the mains voltage. Observe the type plate.

!Material losses

Provide separate fuses for the 3 power circuits (for the appliance, the electric emergency/booster heater and the control unit).

ffLay the relevant pipe cross-sections. Observe the applicable national and regional regulations.

10. Installation

Note

The device is designed in such a way that it can be positioned and connected without removing the cover or side panels.

10.1 Handling

ffUse the recessed grips provided at the sides.

!Material losses

Protect the appliance against heavy impact during transport.

Only allow the appliance to be tilted during transport for a short time to one of its longitudinal sides. The longer the appliance is tilted, the greater the distribution of refrigerant oil in the system. Wait approx. 30 minutes before starting the appliance after it has been tilted.

10.2 Siting

ffWhen installing the appliance, observe the air intake direction.

Fuse protection	Assignment		Cable cross-section
1x C 20 A	Heat pump			2.5 mm² for routing above the surface
	(single phase)			4.0 mm² for routing through a wall
	WPL 15 AS
	WPL 15 ACS
1x C 35 A	Heat pump			6.0 mm² for routing through a wall
	(single phase)
	WPL 25 AS
	WPL 25 ACS
3x C 16 A	Heat pump			2.5 mm²
	(3-phase)
	WPL 20 A
	WPL 20 AC
	WPL 25 A
	WPL 25 AC
2x B 16 A	Electric emer-			2.5 mm²
	gency/booster
	heater WPL 15 AS
	WPL 15 ACS
	WPL 25 AS
	WPL 25 ACS
3x B 16 A	Electric emergen- 2.5 mm²
	cy/booster heater
	WPL 20 A
	WPL 20 AC
	WPL 25 A
	WPL 25 AC
1x B 16 A	Control			1.5 mm²

The electrical data is provided in the "Specification" chapter. You require a J-Y (St) 2x2x0.8 mm² cable as BUS cable.

Note

The appliance contains an inverter for the variable speed compressor. In case of a fault inverters can cause DC residual currents. If RCDs are provided, they have to be type B AC/DC-sensitive.

A DC residual current can block type A RCDs. ffMake sure that the appliance power supply is dis-

connected from the fuse board/distribution panel.

ffPosition the standard appliance on the prepared substrate.

Note

The appliance can be secured to a foundation with screws as additional protection against tipping over.

ffUse the accessories that were in place to secure the appliance to the transport pallet.

10.3 Heating water connection

The heat pump heating system must be connected by a qualified contractor in accordance with the water installation drawings, which are part of the technical guides.

ffThoroughly flush the pipework before connecting the heat pump. Foreign bodies, such as welding beads, rust, sand, sealant, etc. can impair the operational reliability of the heat pump.

ffConnect the heat pump on the heating water side. Check for tightness.

ffEnsure the correct connection of the heating flow and return.

To facilitate connection to the heating system, push-fit connectors are enclosed with the appliance (see chapter "Fitting the push-fit connectors").

ffProvide the thermal insulation in accordance with applicable regulations.

ffWhen designing the heating circuit, observe the internal pressure difference (see chapter "Specification / Data table").

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INSTALLATION

Installation

10.4 Flow and return connection

!Material losses

Insulate the heating flow and return lines for cooling mode with vapour diffusion-proof material.

ffTake the position of the heating flow and return from the following figure:

1

2

4

3	26 03 01 1871

1Heating flow

2Heating return

3Drain

4Ventilation

ffConnect the heat pump to the heating circuit. Check for tightness.

10.5 Fitting the push-fit connector

Note

The plastic push-fit connectors are not suitable for installation in the DHW line or the solar circuit.

ffOnly install the push-fit connectors in the heating or brine circuits.

!	Material losses
	Tighten the screw cap of the push-fit connector by hand.
	Never use a tool.
!	Material losses
	Support sleeves are required when using plastic pipes.

How the push-fit connectors work

The push-fit connectors are equipped with a retainer with stainless steel serrations and an O-ring seal. In addition, the pushfit connectors are equipped with the “twist and lock” function. Simply turning the screw cap by hand will secure the pipe in the connector and push the O-ring against the pipe to seal it.

Making the push-fit 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 main body.

2	3	4

1

26_03_01_0693

1Retainer

2Screw cap

3Gap between screw cap and main body

4Main body

26_03_01_0693

Pipe Ø	28 mm
Depth of insertion A	44 mm

Material losses

! Pipe ends must be deburred.

ffAlways use a pipe cutter to trim pipes.

ffPush the pipe through the O-ring into the push-fit connector until it reaches the prescribed insertion depth.

ffTighten the screw cap by hand against main body as far as it will go. This locks the push-fit connection.

Undoing the push-fit connection

If the push-fit connectors later need to be undone, proceed as follows:

ffTurn the screw cap anti-clockwise until there is a narrow gap of approx. 2 mm. Press the retainer back with your fingers and hold on to it.

ffPull out the inserted pipe.

26_03_01_0693

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