2 air / water heat pumps

2.1 Air as a heat source

Area of application of the air / water heat pump The compact device or the outdoor part of a split heat pump is set up outdoors on a solid substructure (e.g. foundation, pavement slabs) taking into account the nature of the ground and connected to the heating system or the indoor part via thermally insulated district heating pipes or refrigerant pipes in accordance with the specifications of the EnEV. Please note the following:

• Take space requirements into account

• Direction of air flow, prevent air short circuit

• Take icing into account in the discharge direction (paths, terraces)

• Ensure condensate drainage even in frosty conditions

• Take sound propagation into account

• Safety clearances and assembly space for maintenance access according to the instructions for use

• Take wind loads into account

• When installed on the roof, load-bearing capacity of the building and sound decoupling (structure-borne sound)

A general statement on the application limits of air / water heat pumps is not possible. These can differ due to different components in the heat pump or different refrigerants. Areas of application related to the heat source temperature of different heat pumps are, e.g .:

• LA ..S-TU (R) from -22 ° C to +35 ° C

• LAW ..IMR / ITR from -20 ° C to +30 ° C

Availability of the heat source outside air

• Unrestricted

Uses

• monoenergetic

• bivalent parallel (or partially parallel)

• bivalent alternative

• bivalent regenerative

Buffer storage The integration of the air / water heat pump requires a series buffer storage tank in the heat pump flow to ensure that the evaporator (lamellar heat exchanger) is defrosted by reversing the cycle. In addition, the installation of an in-line buffer storage tank extends the runtimes of the heat pump when there is little heat demand (see Section 8.6).

2.1.1 Condensate drain (general information)

The condensation water that occurs during the defrosting phase must be drained off in a short, direct way and protected from frost. To ensure proper drainage, the heat pump must be in a horizontal position. The diameter of the drain pipe for the accumulating condensate must have a diameter of at least 50 mm and must be drained away in a frost-proof manner. Defrosting takes place several times a day as required. Per defrosting process, up to 1.5 liters of condensate can accumulate per kilowatt of heating output (heat pump foundation plan with condensate drain). In some cases, it may be necessary to use a pipe heating system / condensate drain heating system, especially when installing the heat pump on the roof of a building. In order to keep the power requirement of the pipe trace heating as low as possible, the pipe section laid in the frost area should be planned as short as possible. Ideally, the pipe heating is connected to the electrical system of the heat pump (parallel to the nozzle ring heating or directly to the heat pump manager - special accessory KAH 150), but an on-site connection using a self-regulating heating tape with frost protection thermostat is also possible.

Open	1 heat pump 2 heating flow and return (insulated) 3 electric cables (empty pipe) 4 condensate drain 5 frost line

Fig. 2.1:Heat pump foundation plan with condensate drain

2.1.2 Variants of the condensate drain

A frost-free condensate drain line must be guaranteed. To ensure proper drainage, the heat pump must be in a horizontal position.

2.1.2.1 Gravel fill

The condensate that occurs during operation must be drained vertically into a foundation with a gravel bed. A daily infiltration capacity of at least 1.5 liters per kW heating output of the heat pump must be provided, whereby the diameter of the drain pipe for the condensate should be at least 50 mm.

Open

Fig. 2.1.1 Condensate drain in a gravel bed

2.1.2.2 Dirt, rain or drainage channel (not for heat pumps with flammable refrigerants - e.g. R290, R32)

The condensate is fed into a dirt, rain or drainage channel via a condensate pipe laid in the ground. If the condensate is to be discharged into sewers in which fermentation gases can occur, the evaporator must be protected from fermentation gases with the aid of a siphon (observe frost protection). The siphon must be designed with a minimum height of the barrier liquid of 300 mm. The tightness and correct functioning of the condensate drain must be checked and ensured as part of maintenance work. Lifting systems are not permitted.

Fig. 2.1.2 Condensate drain in the sewer (shown with siphon)

2.1.2.3 Free discharge (elevation)

Free drainage is only recommended in areas with short periods of frost. In colder regions at risk of frost, the condensate line must be equipped with appropriately sized and regulated electrical trace heating on an insulated condensate line. The resulting condensate must be led into a frost-free or heated drain.

Fig. 2.1.3 Free condensate drainage on an elevation (e.g. building roof)

Frost protection
If a heat pump system cannot be guaranteed free of frost, a drainage facility (see Fig. 2.1.4) should be provided. As long as the heat pump manager and heating circulation pump are ready for operation, the frost protection function of the heat pump manager works. If the heat pump is shut down or if there is a power failure over a longer period of time, the system must be emptied at three points (see Fig. 2.1.4) and, if necessary, blown out.

In heat pump systems where a power failure cannot be detected (e.g. weekend house), the heating circuit must be operated with a suitable antifreeze (e.g. monoethylene glycol without inhibitors). The pump design and hydraulics of the system must be considered separately. These precautions can lead to lower plant efficiency.

Fig. 2.1.4: Emptying points for air / water heat pumps

Freeze protection
If required, the heating circulation pump is activated automatically via a built-in frost protection sensor in order to prevent the heat pump from freezing up during its idle time (Section 8.2). A permanent power supply to the heat pump is essential to ensure this function.
Maintenance instructions
Heat pumps require maintenance. Regular checks are required by law, depending on the refrigerant and the charge.
The following work can also be carried out without special training:

• Cleaning the condensate pan, checking the continuity of the condensate drain

• Checking and, if necessary, cleaning of the fins on the evaporator

• Checking and, if necessary, cleaning the interior of the heat pump

• Checking and, if necessary, cleaning of the air ducts (air inlet and outlet)

In addition, the tightness of the heat pump and the functionality of the refrigerant circuit must be checked at regular intervals.

2.2 Air / water heat pumps for outdoor installation

Development costs for outdoor installation (Installation at ground level)
The heat pump or the heat source module requires a sufficiently stable, frost-proof and horizontal foundation, which is to be created in accordance with the local requirements and the rules of construction technology. For the heat pump flow and return, the electrical connection or connection lines as well as for the condensate drain, appropriate recesses must be provided in the foundation, which can be found in the foundation plan of the heat pump. The exhaust side must not be positioned towards the building.

• Frost-proof foundation

• Laying thermally insulated heating lines for flow and return in the ground

• Laying electrical connection and load lines in the ground

• Wall ducts for connection lines

• Condensate drain (frost-proof)

• If necessary, observe state building regulations

Lineup
Heat pumps for outdoor installation are equipped with specially painted metal sheets and are therefore weatherproof. The device must always be set up on a permanently flat and horizontal surface. Frost-proof laid pavement slabs or foundations are suitable as a substructure. The frame must lie tightly against the floor all round to ensure soundproofing, prevent water-bearing parts from cooling down and protect the interior of the device from small animals. If this is not the case, gaps must be sealed with weatherproof insulation material. In order to prevent small animals from entering the interior of the device, it is necessary, for example, to seal the connection opening in the base plate. The small animal protection should be made of non-rusting material.

A raised base or a higher foundation may be necessary for snowy regions. Detailed information on this or on snow loads (regionally divided into 5 zones) can be found, for example, on: www.schneelast.info can be viewed.

Fig. 2.1.7: Sketch of the wall bracket

For mounting heights over 1 m, additional safety measures against falling are required depending on the local conditions (e.g. wind loads). Access for maintenance work must be possible at all times.
Make sure that no electrical, gas or water lines are laid at the assembly site. Do not mount the wall bracket near windows and doors, as the air blown out of the side of the heat source module is significantly colder than the ambient air.

Minimum clearances
It must be possible to carry out maintenance work without any problems. The minimum clearances for the various heat pumps can be found in the installation instructions.

Parallel line-up
When installing several heat pumps in parallel, make sure that the air flow for all heat pumps is the same. In addition, a minimum distance must be maintained between the individual heat pumps. This is necessary to prevent an air short circuit between the individual heat pumps. In addition, the minimum clearances for maintenance work in the respective assembly instructions must be taken into account. Maintain a minimum distance of 1.0 m between the individual heat pumps.

Fig. 2.1.8: Parallel connection of heat pumps

Soundproofing measures
The lowest sound emissions are achieved if there are no sound reflections from reverberant surfaces (e.g. facade) on the discharge side within a radius of 3–5 meters. In addition, the foundation can be covered with sound-absorbing material (e.g. bark mulch) up to the level of the cladding sheets. Noise emissions depend on the respective sound power level of the heat pump and the installation conditions. In chap. 5 the relationships between the factors influencing sound emissions, sound propagation and sound immissions are explained in more detail.

Air short circuit
With air / water heat pumps, a free, unhindered air flow must be ensured over the heat pump's evaporator. Air short circuits between the air flow evaporator inlet (intake) and the air flow evaporator outlet (outlet) must be prevented. This is particularly important when installing several heat pumps set up parallel to one another. The heat pump must be set up in such a way that the air cooled by heat extraction is blown out freely. In the case of installation close to the wall, the discharge must not be in the direction of the wall.
Installation in hollows or inner courtyards is not permitted, as the cooled air collects on the floor and is drawn in again by the heat pump during longer periods of operation.
The air blown out by the heat pump is below the current air temperature. Therefore, there should be no water-carrying pipes such as gutters in the direction of discharge.

Electrical connection cable
The power supply (control and load line) is laid separately from the heating water lines in one or two protective pipes (e.g. KG pipe, minimum diameter DN 70).

ELECTRICAL CONNECTION
A shielded communication line (J-Y (ST) Y… LG) (provided by the customer) connects the controller installed in the heat pump with the heat pump manager. The connection can be found in the electrical documentation for the heat pump.

An electrical connection cable is required to operate the air-to-water heat pumps listed in Table 2.1. This enables the heat pump manager installed in the technical room to control all electrical components (e.g. compressor, expansion valve) in the heat pump.

Tab.2.1: Overview of electrical connection cables (* available in special lengths on request)

Intermediate terminals / disconnection of connection lines between the heat pump and WPM

The following points should be checked in the case of separated and reconnected lines:

The maximum cable length and minimum cross-section must not be exceeded or undercut, the following points must be observed:

• Terminal points executed according to regulations

• Terminal material selected to match the cross-section

• Correct contact

• Correct strand connections (e.g. 1 -> 1; 2 -> 2; etc.)

• Protective measures for terminal points observed:

  • IP degree of protection

  • Contact protection

  • Earthing with metal housing

2.2.1 Connection on the heating side

The connection to the heating in the house is to be made with two thermally insulated pipes according to ENEV. Pre-assembled heating water connection lines are recommended, consisting of two flexible pipes for flow and return in a jacket pipe with integrated thermal insulation made of PE foam, including a pre-assembled 90 ° bend for quick and easy connection to the heat pump. The jacket pipe is laid frost-free in the ground and passed through a wall opening into the boiler room or the technical room at ground level. Costly damage to the pipelines can be avoided in advance if there are no deep-rooted plants in the area of the connecting lines.

The distance between the heat pump and the heating distribution in the building should be kept as small as possible. The use of bends and elbows should be minimized, as any additional pressure loss caused by them reduces the efficiency of the overall system.

The maximum length (connecting lines (electrical and hydraulic) from the heat pump installed outside to the heating distribution in the building) should not exceed 40 m and must be in accordance with the applicable technical guidelines.

PE pipes:
Depending on the heat pump output, a PE pipe with at least DN 50 (e.g. PE-X, PE 80/100, outer diameter 50 mm, wall thickness 4.6 mm) must be used from a total pipe length of ≥ 20 m to 40 m, up to one Total line length ≤ 20 m, PE pipe with DN 40 (e.g. PE-X, PE 80/100, outer diameter 40 mm, wall thickness 3.7 mm) can also be used. If the PE pipes are laid above ground, appropriate protection against UV radiation must also be ensured.

Copper pipelines:
The use of copper pipes with a cross-section of ≥ 35 mm is recommended. The use of a smaller cross-section (e.g. CU-28 mm) results in high pressure losses (example: the pressure loss when laying 2 m of copper pipe with a cross-section of 28 mm corresponds to 8 m of laid copper pipe with a cross-section of 35 mm).

The heat pump connections are routed downwards or to the side of the device. The location of the heating lines and the condensate drain can be found in the respective foundation plans in the dimension drawings (see installation and operating instructions).

The implementation in the building is done with insulation and jacket pipe. The building can be sealed with a pipe that is adapted to the heating water connection

• direct implementation in the dry area

• Sealing sleeve against non-pressing water (DIN 18337)

• Wall sealing flange against pressing water (DIN 18336)

Fig. 2.2: Hydraulic and electrical connections when buried in the ground

Fig. 2.3: Hydraulic and electrical connections with side connection

2.2.2 Wall duct

Direct implementation in dry areas:

Fig. 2.4: Sketch of direct wall penetration

Indirect lead-through with sealing sleeve against non-pressing water

Fig. 2.5: Sketch of wall penetration, non-pressing water

Flange against pressing water

Fig. 2.6: Sketch of wall penetration with pressing water

Shortly after the heating water connections have entered the building (approx. 0.8 m below ground level), a filling and draining device must be provided for the heating water flow and return. For buildings at ground level, provide a suitably thermally insulated shaft or enable emptying using compressed air.

2.3 Air / water heat pump for indoor installation

Development costs for indoor installation

• Air ducting (e.g. ducts)

• Breakthroughs in the wall

• Condensate drain

Generally
An air / water heat pump should be set up in a separate room (e.g. technical room) and not in the living area of a building. In extreme cases, cold outside air at temperatures as low as –25 ° C is fed through the heat pump. In rooms with high humidity (e.g. utility rooms) this can lead to the formation of condensation at wall openings and air duct connections and thus to structural damage in the long term. With a room humidity of over 50% and outside temperatures below 0 ° C, the formation of condensation cannot be ruled out despite good thermal insulation. Unheated and frost-free rooms, e.g. cellars, garages, are therefore more suitable.

Please also note:

• Sufficiently dimension air ducts, take into account the available pressure of the fan.

• Provide wall openings, avoid short-circuit currents from the exhaust air to the supply air.

• Place the intake and exhaust openings on different sides of the building, if possible, leave a distance of at least 2 m if they are on the same side of the building.

• Condensate drainage

• Sound propagation

If the heat pump is installed on an upper floor, the load-bearing capacity of the ceiling must be checked. When installing on a wooden ceiling, the structure-borne sound decoupling and the statics must be considered separately.

Air duct
For efficient and trouble-free operation, an air / water heat pump installed inside must be supplied with a sufficiently large air volume flow. This depends primarily on the heat output of the heat pump and is between 2500 and 9000 m³ / h (see installation and operating instructions). The minimum dimensions for the air duct must be observed. The air flow from the intake via the heat pump to the discharge should be designed to be as aerodynamic as possible in order to avoid unnecessary air resistance.

2.3.1 Requirements for the installation room

ventilation
The room where the heat pump is installed should, if possible, be ventilated with outside air so that the relative humidity remains low and the formation of condensation is avoided. Particularly during building drying and commissioning, condensation can form on cold parts.

Air permeability of buildings
Depending on the type of building and technical equipment, the air permeability must not exceed certain limit values. These limit values are specified in DIN 4108-7 "Thermal insulation and energy savings in buildings - Part 7 Airtightness of buildings". How a building is to be measured and how heat pumps are to be taken into account when measuring is regulated in DIN EN 13829 "Determination of the air permeability of buildings".

2.3.2 Air ducts and accessories

When installing heat pumps installed inside, ensure that the air flow is as short as possible. A corner installation is particularly suitable here.

2.3.2.1 Straight air ducts and bends

The vapor-permeable and moisture-resistant air ducts are available as a kit. They are offered in the corresponding cross-sections as a 90 ° bend and as an extension. The internal insulation made of mineral wool and laminated glass fiber fleece prevents condensation from forming. Minor damage to the outer jacket has no effect on the functionality and can be repaired with commercially available plaster. If necessary, the channels can be painted with commercially available emulsion paint. The air duct kit LKL ..A consists of four side walls made of glass fiber reinforced concrete including adhesive and two cover frames. It is not delivered pre-assembled, but must be assembled on site. The air duct kit can be easily transported and shortened to the required length on site.

Fig. 2.7: Components for kit LKL ..A

Advantages of the LKL ..A kit

• Low risk of damage during transport

• The kit can easily be shortened to the correct length on site

• Cover frames enable quick and easy assembly

Tab.2.2: Kits for air ducts (straight and curved)

2.3.2.2 equipment

The following air routing components are available in four different sizes and matched to the available performance levels:

• Rain protection grille

• Air ducts (duct / arch including end and extension frames)

• Sealing sleeves

• Air deflector hood

Sealing sleeve
The sealing sleeve is used to seal the air ducts made of glass fiber lightweight concrete on the heat pump. The air ducts themselves are not screwed directly to the heat pump. When it is ready for operation, only the rubber seal touches the heat pump. On the one hand, this ensures easy assembly and dismantling of the heat pump and, on the other hand, good structure-borne noise decoupling is achieved.

Fig.2.8. Sealing sleeve for air ducts

Rain protection grille for heat pumps
Rain protection grids serve as an optical screen for wall openings above ground level and to protect the air duct from the effects of the weather. It is attached to the wall from the outside and can be used regardless of the type of air duct. The rain protection grille (special accessory) specially developed for heat pumps has a significantly lower pressure loss than commercially available weather protection grids. It can be used on both the intake and the exhaust side. To protect against small animals and leaves, a wire mesh should be attached between the wall and the rain protection grille. The free cross-section of the grid must be at least 80% (mesh size> 0.8 cm). Any burglar protection that may be required must be added on site.

Tab. 2.3: Fastening material for rain protection grille

Fig. 2.9: Rain protection grille for heat pumps

Tab.2.4: Dimension table for fastening the RSG 500-800

Fig.2.10: Dimensions for RSG 500-800

2.3.3 Air duct hose set for air / water heat pumps

F R E I: Air hose set LUS 2 or LUS 4
Fig.2.11 Free

Fig.2.12 Free

2.3.4 Project planning for air ducts

2.3.4.1 Pressure loss in air ducts

In the case of air / water heat pumps installed inside, an air duct may be necessary on the intake and / or exhaust side, which creates an additional pressure loss on the heat source side (intake and exhaust side). Since the fan only has a limited free pressure, the air duct system must be dimensioned accordingly. When planning the air routing (air intake and air discharge), it must be ensured that the maximum pressure loss of the individual components does not exceed the free compression value specified in the device information (see installation and operating instructions). Cross-sectional areas that are too small or frequent deflections (e.g. weather protection grilles, corner ducts) result in inadmissibly high pressure losses and lead to inefficient or even failure-prone operation.
The suction and discharge can be done either via a light shaft or wall opening with rain protection grille.

Tab.2.5: Reference values for the air duct system accessories

The components for the air duct available as special accessories are below the free pressures in the standard setups shown. This means that there is no need to check the total pressure loss.

The suction and discharge can be done either via a light shaft or wall opening with rain protection grille.

2.3.4.2 Installation of air ducts

If a standard installation variant is selected, the duct sections can be installed without being shortened. When positioning the air duct, the required minimum distances between the heat pump and walls must be observed. Air ducts or bends are foamed into the wall opening using commercially available construction foam in accordance with the dimensional drawings. The duct sections are fixed in a self-supporting manner from the floor using a suitable substructure or from the ceiling using threaded rods. A distance of approx. 2 cm should be left between the heat pump and the duct to facilitate subsequent maintenance of the heat pump, if necessary. In order to avoid structure-borne noise being introduced into the building, no force-fit connection (e.g. screw connection) must be established between the heat pump and air ducts. The air duct to the heat pump is sealed with the sealing sleeve available as an accessory (dimensions for RSG 500-800).

2.3.4.3 Butt joint between two duct parts

Manufacture of custom lengths
Air duct kits can be shortened or adapted before the actual gluing. The resulting cut edges are coated with a multi-force adhesive included in the scope of delivery and framed by a galvanized U-profile. If a straight duct is shortened or adapted, two air ducts can be created from it with the end frame set (ARLK) available as a special accessory. With the connection set (VSLK) available as a special accessory, air ducts can be extended (observe max. Free compression).

2.3.4.4 Air intake or exhaust via light shafts

If the wall ducts of the air ducts at the intake or outlet are below ground level, it is advisable to route the air through aerodynamic plastic light shafts. An air baffle must be used for concrete manholes. The light shaft on the exhaust side should be provided with a sound-absorbing lining. Weather-resistant mineral fiber boards with a density of approx. 70 kg / m³ or open-cell foam (e.g. melamine resin foam) are suitable for this.

• The minimum cross-sections of the shafts must at least correspond to the dimensions of the air ducts used

• Sealing of the transition between light shaft and wall opening (see Insulating the wall breakthroughs )

• Cover with grating (burglar protection)

• Provide a drain for condensate

• To protect against small animals and leaves, a wire mesh (mesh size> 0.8 cm) should also be attached.

• Provide protection against snow build-up

Fig. 2.13: Example: Dimensions for standard light wells

2.3.4.5 Insulating the wall breakthroughs

The necessary wall openings are to be created on site. It is imperative that they are clad with thermal insulation on the inside to prevent the masonry from cooling down or condensation. In the example for the execution of a wall opening, for example, insulation using diffusion-proof rigid foam (insulation thickness 25 mm - e.g. PU rigid foam) is shown. The transition between wall insulation and air duct (outside wall side) must be connected airtight. In unfavorable weather conditions (e.g. in driving rain), penetrating water must be drained away on a slope.

Fig. 2.14: Example of a wall opening

2.3.4.6 Sound reduction through air ducts

The inside insulation made of mineral wool and laminated glass fiber fleece prevents the formation of water condensation and significantly reduces the sound radiation on the weather protection grille on the outlet side of the air duct.
Straight air duct A reduction in sound pressure of ~ 1 dB (A) per meter of air duct.
Air duct arch A reduction in sound pressure of ~ 2 to 3 dB (A) per sheet.

2.3.5 Installation variants for air ducts

The dimensions for the installation of the heat pump and the position of the wall openings are determined as follows:

1. Step: Determination of the appropriate air routing components for the respective air / water heat pump type.

2. Step: Selection of the appropriate installation variant.

3. Step: Take the required dimensions from the tables for the corresponding installation variant.

4. Step: Planning the appropriate insulation for the outer wall penetration
   
   

Tab. 2.6: Legend for installation variants for air ducts

2.3.5.1 Air routing variants Air / water heat pumps for indoor installation

The following heat pumps are supplied with an insulating strip for the intake and exhaust side as standard. This enables a corner installation of the heat pump without air ducts or a wall installation with an air duct on the discharge side (variant 1, 2 and 4).
Heat pumps

• LI 9TU, LI 12TU and LI 16I-TUR

• LIK 8TH

• LIK 12TU

Version 1: Corner installation without air duct

Fig. 2.15: Top view - direct corner installation with insulation strips

Variant 2: Wall installation with air duct on the discharge side

Fig. 2.16: Wall installation with air duct on the discharge side - top view

Variation 3: Wall installation with air duct on the intake and exhaust side

Fig. 2.17: Wall installation with air duct on the intake and exhaust side - top view

Variation 4: Installation of variants 1 - 3 with storage tank below
For various indoor heat pumps, there are buffer storage tanks available below, on which the heat pump can be installed. This increases the overall height of the heat pump so that the air ducts can be installed directly below the ceiling.

Tab. 2.7: Shelf buffers for air / water heat pumps installed inside

Fig. 2.18: Installation with storage tank below - side view

2.3.5.2 Installation examples heat pump with storage tank below

LI 9TU, LI 12TU, LI 16I-TUR

Fig.2.19: Side view - LI 9TU, LI 12TU and LI 16I-TUR (wall installation - air duct on discharge side)

Fig.2.20: Top view - LI 9TU, LI 12TU and LI 16I-TUR (wall-mounted installation - air duct on discharge side)

Fig.2.21: Front view - LI 9TU, LI 12TU and LI 16I-TUR (wall installation - air duct on discharge side)

LI 11TES

Fig.2.22: Top view - LI 11TES (wall installation - air duct on discharge side)

Fig.2.23: Front view - LI 11TES (wall installation - air duct, discharge side)

LI 16th, LI 20th

Fig.2.24: Top view - LI 16TES, LI 20TES (wall installation - air duct on discharge side)

Fig.2.25: Front view - LI 16TES, LI 20TES (wall installation - air duct on discharge side)

2.3.5.3 Installation examples for wall and corner installation

LIK 8TES - corner installation

Fig.2.26: Side view - LIK 8TES (corner installation)

Fig.2.27: Top view - LIK 8TES (corner installation)

Fig.2.28: Front view - LIK 8TES (corner installation)

LIK 8TES - wall installation with air duct on the discharge side

Fig.2.29: Top view - LIK 8TES (Wall installation - air duct, discharge side)

Fig.2.30: Front view - LIK 8TES (wall installation - air duct, discharge side)

LI 9TU, LI 12TU and LI 16I-TUR - corner installation

Fig.2.31: Side view - LI 9TU, LI 12TU

Fig.2.32: Top view - LI 9TU, LI 12TU (corner installation)

Fig.2.33: Front view - LI 9TU, LI 12TU (corner installation)

LI 9TU, LI 12TU and LI 16I-TUR - wall installation with air duct on the discharge side

Fig.2.34: Top view - LI 9TU, LI 12TU and LI 16I-TUR (wall installation with air duct on the discharge side)

Fig.2.35: Front view - LI 9TU, LI 12TU and LI 16I-TUR (wall installation with air duct on the discharge side)

LIK 12TU - Corner installation

Fig.2.36: side view - LIK 12TU

Fig.2.37: Top view - LIK 12TU (corner installation)

Fig.2.38: Front view - LIK 12TU (corner installation)

LIK 12TU - Wall installation with air duct on the discharge side

Fig. 2.39: Top view - LIK 12TU (Wall installation with air duct on the discharge side)

Fig.2.40: Front view - LIK 12TU (wall installation with air duct on the discharge side)

LI 11TES - Wall installation with air ducts on the intake and exhaust side

Fig.2.41: Top view - LI 11TES (Wall installation with air duct on the intake and exhaust side)

LI 11TES - wall installation with air duct on the exhaust side

Fig.2.43: Front view - LI 11TES (Wall installation with air duct on the discharge side)

Fig.2.44: Top view - LI 11TES (Wall installation with air duct on the discharge side)

LI 16th, LI 20th - Wall installation with air duct on the exhaust side

Fig.2.45: Top view - LI 16TES, LI 20TES (wall installation with air duct on the discharge side)

Fig.2.46: Front view - LI 16TES, LI 20TES (Wall installation with air duct on the discharge side)

LI 16TES, LI 20TES - Wall installation with air ducts on the intake and exhaust side

Fig.2.47: Top view - LI 16TES, LI 20TES (wall installation with air duct on the intake and exhaust side)

Fig.2.48: Front view - LI 16TES, LI 20TES (Wall installation with air duct on the intake and exhaust side)

LI 24TES, LI 28TES - Wall installation with air duct on the discharge side

Fig.2.49: Top view - LI 24TES and LI 28TES (wall installation with air duct on the discharge side)

Fig.2.50: Front view - LI 24TES and LI 28TES (wall installation with air duct on the discharge side)

LI 24TES, LI 28TES - Wall installation with air ducts on the intake and exhaust side

Fig.2.51: Top view - LI 24TES and LI 28TES (wall installation with air duct on the intake and exhaust side)

Fig.2.52: Front view - LI 24TES and LI 28TES (wall installation with air duct on the intake and exhaust side)

2.4 Air / water heat pumps in integral / split design

Integral (split) heat pumps consist of an outdoor and indoor unit, which are connected by a line that carries refrigerant. The outdoor unit contains the compressor, an air-pressurized evaporator and the expansion valve, and the indoor unit contains the condenser. The energy contained in the refrigerant for heating and hot water preparation is transferred to the heating circuit via this.

Areas of application of the Integral-/ Split heat pump

-22 ° C ... + 30 ° C (LAW / LAK heat pumps) -22 ° C ... + 35 ° C (System M / M Flex)

Availability of the heat source outside air:

• unrestricted

Usage options:

• monoenergetic

• bivalent

• regenerative

• cool

2.4.1 Installation

When installing the integral / split heat pumps, various requirements regarding installation and minimum space requirements must be observed. The refrigerant and electrical lines between the indoor and outdoor units are to be routed through the house wall. The wall ducts described (see Insulating the wall breakthroughs ) be used. These are available as accessories.

Fig.2.53: LAW ..IMR / ITR condensate drain

Fig.2.54: M Flex condensate drain and System M

Development costs external unit

• Laying electrical connection and load lines

• Laying of refrigerant lines between the indoor and outdoor units

• Wall openings for connection lines

• Observe the minimum clearances for assembly

• If necessary, observe state building regulations

Fig.2.55: Installation of the LAW 9IMR external unit

Fig.2.56: Installation of the LAW 14ITR external unit

Fig. 2.57: Installation of the LAW 9IMR external unit using a wall bracket

Fig.2.58: Installation of the M Flex outdoor unit and the M Comfort system

Fig. 2.59: Installation of the M Flex external unit and M system with wall bracket

If the external unit (heat source module) is installed using a wall bracket, the following points must be observed:

• Note the weight of the external unit.

• Recommended maximum height of the wall bracket above the floor 1 m. For mounting heights over 1 m, additional safety measures against falling are required depending on the local conditions (e.g. wind loads).

• Access for maintenance work must be possible at all times.

• Use suitable mounting material depending on the nature of the wall to attach the wall bracket.

• If necessary, use rubber buffers as silencers.

2.4.2 Condensate drain of the external unit

The condensate water that accumulates in the outdoor unit during operation must be drained away frost-proof (infiltration capacity of at least 1.5 liters per kW heating output of the heat pump). The condensate pan of the external unit offers various options for this. It is possible to let the condensate drip flat onto the floor in an uncontrolled manner. The floor under the heat pump should be designed with coarse and fine gravel so that the condensate can drain away quickly (see Figure 2.65). If there is insufficient infiltration capacity, increased ice formation can occur during periods of frost. This does not apply to the ground below the foundation.

Fig. 2.60: LAW ..IMR / ITR foundation plan with gravel bed

In regions with longer periods of frost, controlled condensate drainage is recommended. The condensate is drained off at a defined point in the condensate pan (see Fig. 2.66). When discharging via a drain elbow, particular attention should be paid to short distances at the building entry in order to prevent the condensate from freezing on the drain pipe. Additional insulation measures are also required on the drain pipe.

Fig. 2.61: LAW ..IMR / ITR foundation plan with a controlled process

Tab.2.8: Legend to Fig. 2.60 and Fig. 2.61

Fig. 2.62: Foundation plan M Flex and System M Comfort with gravel bed

Tab.2.9: Legend to Fig.2.62

2.4.2.1 Indoor unit with integrated buffer and hot water storage tank (LAW)

The indoor unit (LAW) must always be set up indoors on a flat, smooth and horizontal surface. The device must be set up in such a way that maintenance work can be carried out from the operator's side without any problems. This is guaranteed if a distance of 1m is maintained on the front. With the required height of the installation room, the space requirement, approx. 30 cm, for changing the protective anode must be taken into account (see Fig. 2.65) The installation must take place in a frost-proof room and via short cable routes.

The set-up and installation must be carried out by an approved specialist company. When installing the indoor unit on an upper floor, the load-bearing capacity of the ceiling must be checked and, for acoustic reasons, the vibration decoupling must be planned very carefully. An installation on a wooden ceiling is to be rejected.

Fig. 2.63: Installation of the indoor unit

2.4.2.2 Compact indoor unit without integrated hot water and buffer storage (LAK)

The indoor unit (LAK) must always be installed indoors on a flat and smooth vertical wall. Maintenance work can be carried out from the operator's side without any problems (a minimum distance to the side is not required for maintenance work). This is guaranteed if a distance of 1m is maintained on the front. The indoor unit should be installed at a height of approx. 1.3 m. (see Fig. 2.66) The installation must take place in a frost-proof room and via short cable routes.

The set-up and installation must be carried out by an approved specialist company.

Fig. 2.64: Installation of the internal unit

The connections on the heating side of the indoor unit are provided with 1 "flat-sealing external thread. When connecting, an open-end wrench must be held at the transitions. There is a hose nozzle on the safety valve for on-site connection of a plastic hose. This must be led into a siphon or drain.

Fig. 2.65: Connection sets VSH LAK and VSW LAK

2.4.2.3 Indoor unit with integrated buffer storage (System M / M Flex)

The indoor unit must be set up in a frost-free and dry room on a flat, smooth and horizontal surface. The frame should lie close to the floor all around to ensure adequate soundproofing. The subsurface must have sufficient load-bearing capacity for the weight of the heat pump and the amount of hot water. The indoor unit must be set up in such a way that customer service can be carried out without any problems. This is guaranteed if a distance of 1 m is maintained in front of and on the right side of the heat pump. The distance indicated on the left is required for the hydraulic and electrical connection by the installer.

Fig. 2.66 Maintenance intervals for indoor unit M Flex / System M

Frost or temperatures higher than 35 ° C must not occur in the installation room at any time of the year. The minimum volume of the room in which the heat pump is installed must not fall below the following value, depending on the amount of refrigerant in the device:

Tab. 2.10: Minimum volume of the installation room depending on the amount of refrigerant

If the amount of refrigerant is increased, the room volume must be calculated using the following formula: minimum allowable room volume [m³] = amount of refrigerant [kg] / allowable concentration 0.39 [kg / m³]

2.4.2.4 Indoor unit with integrated buffer tank and adjacent hot water tank system M

The indoor unit and the hot water storage tank must be set up in a frost-free and dry room on a flat, smooth and horizontal surface. The frame of the indoor unit should lie close to the floor all around to ensure adequate soundproofing. The hot water storage tank can be aligned exactly to the indoor unit using adjustable feet. The subsurface must have sufficient load-bearing capacity for the weight of the heat pump and the amount of hot water. Both parts must be set up in such a way that customer service work can be carried out without any problems. This is guaranteed if a distance of 1 m is maintained in front of and on the right side of the heat pump.

Fig. 2.67 Maintenance intervals for the system M indoor unit and the adjacent designer hot water storage tank

With the corner installation shown above, the hot water storage tank can only be installed after the hydraulic, electrical and refrigeration lines have been connected to the indoor unit. The flexible lines for flow and return to the hot water storage tank must first be attached to the indoor unit and connected to the storage tank from above after the storage tank has been positioned. The hot water sensor pre-installed on the indoor unit must be inserted into the immersion sleeve provided on the back of the storage tank. In the case of hot water storage tanks with additional electrical heating, there are two immersion sleeves at different heights on the back of the storage tank for the installation of the hot water sensor. Lower position for high dumping capacities, upper position for energy-optimized operation. The cold and hot water connections can then be made. For this purpose, easy-to-open connections are recommended in the event of service. Frost or temperatures higher than 35 ° C must not occur in the installation room at any time of the year.

2.4.3 Connection of indoor and outdoor unit (refrigerant line)

The connection between the indoor and outdoor units is established via a refrigerant line.

LAW and LAK heat pumps
Unfilled refrigerant lines with a length of 25 m are available as accessories for all LAW and LAK heat pumps. If the distance between the indoor and outdoor units of the split heat pumps is greater than 15 m, additional refrigerant must be added (see legend for installation options for air ducts).

M Flex and System M - heat pumps
Unfilled refrigerant lines with a length of 3 m, 7 m and 10 m (MREF ...) are available as accessories for all M Flex and System M heat pumps, longer refrigerant lines are not possible.

Fig.2.68 Installation sketch of lifting arch (example LAK and LAW heat pump)

Tab. 2.11: Design table for refrigerant refill LAW / LAK ..IMR / ITR, M Flex and System M

2.4.4 Electrical connection of split and integral heat pumps

2.4.4.1 Outdoor unit LAW / LAK

A load and control line must be connected to the outdoor unit. Both lines must be laid between the indoor and outdoor units. The load line is used to supply power to the outdoor unit and the control line for communication between the outdoor and indoor unit. When designing and installing the two lines, VDE guidelines and regulations as well as local conditions must be observed. The electrical protection for the outer part is located in the inner part. The entire heat pump must also be protected externally. The load line for the 9 kW outdoor unit must be 3-wire and connected to the L / N / PE (power supply) terminals. In the case of the 14 kW outdoor unit, the load line must be 5-core and connected to terminals R / S / T / N / PE. A shielded 2-core cable is to be used as the control line. The control line is connected to the terminals (Bus_A/ Bus_B) the gateway board (smaller board in the outdoor part) and connected to the heat pump manager (+/-) in the indoor part.

2.4.4.2 LAW / LAK indoor unit

Two electrical lines must be connected to the indoor unit: the load line of the heat pump and the control voltage for the integrated heat pump manager (see appendix, chapter 3.3), (load: 3 ~; 1x 5-wire; control: 1 ~; 1x 3-wire). When designing and installing the cables, VDE guidelines and regulations as well as local conditions must be observed. Only in the case of the heat pump combination with the 9 kW outdoor unit can the power be supplied through two separate supply lines (2x 1 ~ / N / PE; 230 VAC; 50 Hz) through load sharing. Otherwise the power is always supplied via a cable (3 ~ / N / PE; 400 VAC; 50 Hz).

The up to 5-core load line for the power section of the heat pump is led from the heat pump's electricity meter via the EVU blocking contactor (if required) into the heat pump (for load voltage, see installation instructions for LAK and LAW). In the load line for the heat pump, an all-pole disconnection with a contact gap of at least 3 mm (e.g. EVU blocking contactor, power contactor), as well as an all-pole circuit breaker with common tripping of all external conductors, must be provided (tripping current and characteristics according to device information). The load line (1 ~ L / N / PE ~ 230 V, 50 Hz) for the heat pump manager must be connected to permanent voltage and must therefore be tapped in front of the EVU blocking contactor or connected to the household electricity, otherwise important things during the EVU blocking Protective functions are out of order. The control voltage must be protected according to the GI sheet / type label. The EVU blocking contactor (K22) with 3 main contacts (1/3/5 // 2/4/6) and an auxiliary contact (NO contact 13/14) must be designed according to the heat pump output and provided on site.

The normally open contact of the EVU blocking contactor (13/14) is looped from terminal strip X3 / G to plug terminal N1-J5 / ID3. CAUTION! Low voltage!

In the indoor unit, the load line must be connected to terminal strip X1 and the control voltage to terminal X2. For detailed instructions on how to connect external components and how the heat pump manager works, please refer to the device connection diagram and the enclosed installation and operating instructions for the heat pump manager. The 2nd heat generator is connected to a heating output of 6 kW in the delivery state. To reduce the power to 4 kW or 2 kW, one or both copper bridges in terminal area X7 (see circuit diagram in the installation and operating instructions) must be removed. For detailed information, see the circuit diagrams in the appendix. The electrical cables can be inserted into the device from below (in the area of the cold connection) or above (there is a cable duct molded into the PU foam under the storage tank cover).

2.4.4.3 Heat source module system M / M Flex

A load line (plug + A110-X1 <> + A100-XA110) and control line (plug + A110-X5 <> + A100-X5.2) must be laid between the cooling circuit and the external unit parallel to the refrigerant line. The two connecting lines are supplied with the refrigerant lines in an appropriately preconfigured length.

LAN / network connection (standard with System M or with accessories for M Flex)
The heat pump is intended for connection to the Internet via a router. This means that the user can access the system at any time for setting parameters or for reading out information. Maintenance cases or software updates are simplified. A commercially available network cable (Cat. 5) is required for connection, which is plugged between the external router (+ A350) and the network interface (+ A210) of the indoor unit.

2.4.4.4 Indoor unit system M / M Flex

At least the following electrical lines / signals must be connected to operate the heat pump: Load voltage / cooling circuit In the power supply for the cooling circuit, all-pole disconnection with a contact gap of at least 3 mm (e.g. EVU blocking contactor, power contactor) must be provided. A 1- or 3-pole automatic circuit breaker (tripping current according to device information) for the 1st or 3-phase cooling circuit module provides short-circuit protection, taking into account the layout of the internal wiring. The relevant components in the heat pump contain internal overload protection. The connection to the switch box of the refrigeration circuit is made at + A100-X1 (L, N, PE or L1, L2, L3, N, PE - observe the phase sequence).

Communication / control voltage (hydraulic <-> cooling circuit)
The communication and control voltage lines from the hydraulic switch box (with heat pump manager) to the cooling circuit module are already pre-wired and end at plugs + A100-X2 (control voltage) and + A100-X5.1 (communication). Under certain circumstances, these only need to be plugged in.

Control voltage
The 3-core electrical load line for the heat pump manager (+ A200-N1) is routed into the heat pump to the hydraulic switch box + A200-X2. The supply line (L / N / PE; 230 V; 50 Hz) must be connected to permanent voltage and for this reason must be tapped in front of the EVU blocking contactor or connected to the household electricity, otherwise important protective functions will be out of operation during the EVU blocking.

EVU lock
The EVU blocking contactor (-K22) with main contact and auxiliary contact (NO contact 13/14) must be designed according to the heat pump output and provided on site. The potential-free normally open contact of the EVU blocking contactor (13/14) is wired to the hydraulic switch box and is to be connected to the corresponding plug + A200-XK22 there.

Outside sensor
The outside sensor is connected to the hydraulic module via the connector + A200-XR1. CAUTION! Low voltage!

Hydraulic load voltage
For the voltage supply of the 2nd heat generator, a load line must be pulled to the device according to the output and connected to plug + A400-X1 on the hydraulic switch box. In the delivery condition, the 2nd heat generator is configured to 6 kW in order to ensure the increased heat demand during the drying out of the building. In normal operation, this must be adapted to the additional heating output actually required. To reduce this to 4 or 2 kW, one or two connections between + A400-K20 (relay 2nd heat generator) and + A400-F17 (safety temperature limiter) - both contained in the hydraulic switch box - must be removed.

2.4.5 Connection diagram LAW 9IMR

Fig. 2.69: Connection plan LAW 9IMR

2.4.6 Connection diagram LAW 14ITR

Fig. 2.70: Connection plan LAW 14ITR

2.4.7 LAK 9IMR connection diagram

Fig.2.71: LAK 9IMR connection diagram

2.4.8 LAK 14ITR connection diagram

Fig.2.72: LAK 14ITR connection plan

2.4.9 2.4.9 M Compact system connection diagram

Fig.2.73: Connection plan system M Compact (230V)

2.4.10 System M Comfort connection diagram

Fig.2.74: Connection plan System M Comfort (230/400 V)

2.4.11 Connection diagram M Flex 0609/0916 / 0916M

Fig.2.75: Connection plan M Flex 0609 (230V), 0916 (M) (230 / 400V)

2.4.12 Cable plan for air / water heat pumps for outdoor installation

Tab. 2.12: Cable plan for air / water heat pumps for outdoor installation

Fig. 2.76: Cable plan for air / water heat pumps for outdoor installation

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