Mounting and operating instructions. Fresh water station WHI freshaqua 44 #1 Fresh water station WHI freshaqua 55 # /

Transcription

1 Mounting and operating instructions Fresh water station WHI freshaqua 44 #1 Fresh water station WHI freshaqua 55 # /

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3 1 Information for the user User guidance Symbols Target group Warranty and liability Safety Designated use Safety instructions Safety measures Electrical connection Structural modifications Disposal Product description Function Technical Data Fresh Water Stations Technical Data Pumps PWM input signal (solar profile) Hydraulic performance data Dimensioning and Planning Dimensioning the storage Circulation mode Installation Assembly Connection Controller connection Operation Commissioning Filling the primary circuit Commissioning the controller Maximum tapped flow rate Setting the temperature Maintenance Spare parts Spare parts list WHI freshaqua 44 #1 ( ) Spare parts list WHI freshaqua 55 #1 ( ) / Ext. PAW 3-32

4 10 Accessories Withdrawal valve Circulation set Commissioning log Notes / Ext. PAW 4-32

5 1 Information for the user 1 Information for the user These installation and operation instructions form part of the device and must be stored at the place of use. Carefully read these instructions before installation and commissioning. 1.1 User guidance Symbols Immediate danger of high risk. Non-observance will result in serious injuries or death. DANGER Danger of medium risk. Non-observance may result in environmental damage, serious injuries or death. WARNING Danger of low risk. Non-observance may result in property damage or slight to moderate injuries. CAUTION NOTICE Important information Target group This installation and operation manual is addressed to operators and qualified skilled personnel. It must be observed by anyone working on the machine. Work on the machine may only be performed by persons that have received the required training or instruction. Persons with restricted physical, sensory or mental abilities may work on the machine if supervised or instructed by an authorized person. Children may not play with the machine. 1.2 Warranty and liability Warranty and lilability claims for personal and material damage are void if they are due to one or several of the following causes: Use of the machine contrary to its designated use, Non-observance of the installation and operation instructions, Operation of the machine with non-operational safety or protective devices, Continued use despite the presence of a defect, Improper assembly, commissioning, operation and maintenance of the machine, Unauthorised modification of the machine, Installation of additional components that were not tested together with the machine, Repairs carried out incorrectly, Failure to use Weishaupt original parts, Defects in the supply lines, Force majeure / Ext. PAW 5-32

6 2 Safety 2 Safety 2.1 Designated use The fresh water station must only be installed in heating systems between the buffer tank and the domestic water circuit. Due to its construction, it must only be installed and operated in a vertical position. The technical limit values specified in this instruction must be considered. Use only original accessories in connection with the fresh water station. Using the station contrary to its designated use will invalidate all liability claims. The wrapping materials are made of recyclable materials that can be recycled by standard recycling operations. 2.2 Safety instructions The following must be observed during installation and commissioning: Relevant local and national regulations Accident prevention regulations of the employers' liability insurance association Instructions and safety instructions mentioned in these instructions Risk of scalding from hot water! Due to the third party circulation, up to 90 C hot water may run out at the tapping point in the primary circuit. WARNING No external pump may be installed between the fresh water station and the buffer tank. The fresh water station must not be connected to a heating circuit distributor. CAUTION Risk of burns! The valves and fittings and the pumps can become heated up to more than 95 C during operation. The insulation must remain closed during operation / Ext. PAW 6-32

7 2 Safety NOTICE Material damage due to mineral oils! Mineral oil products cause permanent damage in the material, resulting in its sealing characteristics getting lost. We cannot be held liable for damage caused by seals thus damaged, nor will we offer a replacement under warranty. It is imperative to prevent the EPDM from making contact with substances containing mineral oils. Use a silicone- or polyalkylene-based lubricant free of mineral oil such as Unisilikon L250L and Syntheso Glep 1 from Klüber or a silicone spray. NOTICE Malfunctions! The fresh water station must be integrated into the potential equalisation of the electrical installation. If this is not ensured by the connected pipework then establish a correct potential equalisation connection to the main potential connection. 2.3 Safety measures Immediately eliminate safety-relevant defects and replace safety-relevant components when they have reached the end of their service life due to their construction. 2.4 Electrical connection When performing any work on live parts: Observe the accident prevention regulations BGV A3 and local regulations, use tools according to EN Structural modifications Conversion measures are only allowed after prior approval in writing by the Max Weishaupt GmbH. Additional components may only be installed if they were not tested together with the machine. Use only Weishaupt original parts. 2.6 Disposal Dispose of the materials used properly and in an environmentally compatible manner. In doing so, observe local regulations / Ext. PAW 7-32

8 3 Product description 3 Product description The fresh water station is a pre-assembled fittings group tested for leaks for transferring heat between the buffer tank and the domestic water circuit. It contains a preset controller and important valves and fittings for operating the system: Ball valves in the primary circuit Piston valves in the secondary circuit Safety valve in the secondary circuit Pre-assembled controller Temperature sensor on the cold water supply Temperature sensors on the heating supply Temperature sensor on the warm domestic water outlet Flow meter on the warm domestic water outlet Fill and drain valve for draining the heat exchanger and the pump Vent plug for venting the heat exchanger Connections 1 Primary side: return to buffer tank 2 Secondary side: cold water inlet 3 Secondary side: hot water outlet 4 Primary side: supply from buffer tank A B C D E F G H I J K Equipment Ball valve with check valve Primary pump Bypass (for WHI freshaqua 55 #1 only) Piston valve with drain valve Piston valve with drain valve and temperature sensor Valve for filling and draining und temperature sensor FlowSonic flow meter Plate heat exchanger Vent valve (primary circuit) Safety valve 10 bars and temperature sensor (Only for protection of the station. Does not replace the safety valve that must be installed on-site.) Ball valve with check valve and temperature sensor (for WHI freshaqua 55 #1 only) / Ext. PAW 8-32

9 3 Product description 3.1 Function The fresh water stations WHI freshaqua are used for the comfortable and hygienic heating of domestic water according to the continuous flow heater principle. Other than in conventional domestic water storage tanks, foodstuff water is not used for energy storage and stored as hot water for hours or days. It is only heated when required using a high-performance plate heat exchanger. The energy for heating the domestic water comes from a buffer tank that can be heated by different systems - using solar systems as well as solid fuel boilers, oil / gas boilers, heat pumps or other systems. The WHI freshaqua modules are well suited for use in combination with a thermal solar system. The very good cooling of the heating water in the highly effective plate heat exchangers leads to an increased efficiency of the solar circuit as the average temperature of the solar circuit can be reduced due to the cold return. In event of great tapping differences, the WHI freshaqua fresh water stations always have to guarantee a constant outlet temperature at the hot water tap. The speed of the highly efficient EC pumps of the latest generation is controlled by a high-performance closed-loop control always allowing the heating flow rate to be optimally set to the current tap capacity. The closed-loop control receives the necessary information for adjusting the system from a flow rate sensor and extremely fast temperature sensors that detect the smallest temperature deviations immediately. The WHI freshaqua units can be optionally equipped with a circulation kit with highly efficient EC circulation pump for internal retrofitting. The closed-loop control can operate the pump in different circulation modes; always adapted to the current system and requirements of the customer. During commissioning, the circulation return temperature can be set individually on the circulation system so that the recordable and traceable DVGW (551) requirements for a maximum cooling of the circulation by 5 K can be fulfilled. Thus, the WHI freshaqua therefore offer perfect comfort, optimum hygiene and a future-orientated energy saving operation / Ext. PAW 9-32

10 3 Product description 3.2 Technical Data Fresh Water Stations Dimensions WHI freshaqua 44 #1 WHI freshaqua 55 #1 Height (with insulation) Width (with insulation) Depth (with insulation) Centre distance, top Centre distance, bottom Primary pipe connection (storage tank circuit) Secondary pipe connection (WHI freshaqua) Safety valve outlet Operating data Max. admissible pressure Min. flow rate 795 mm 602 mm 298 mm 120 mm 100 mm 1½" male thread, flat sealing 2" male thread, flat sealing 1" male thread, flat sealing 1¼" male thread, flat sealing G ¾" female thread primary: 6 bars, secondary: 10 bars 1 l/min Operating temperature 2 95 C Max. power Qmax 153 kw at flowprim. 75 / DHWsec. 60 / DCW sec kw at flowprim. 75 / DHWsec. 60 / DCW sec. 10 Flow rate at Qmax primary: 2500 l/h, secondary: 44 l/min primary: 3000 l/h, secondary: 55 l/min Operating temperature sensors -25 C to +120 C Equipment Safety valve Primary pump secondary: 10 bars, suitable for domestic water High-efficiency pump with PWM control, 3-70 W High-efficiency pump with PWM control, 5-87 W Heat exchanger 40 plates 60 plates Flow rate sensor Temperature sensors primary: 1 x PT1000, rapid; secondary: 2 x PT1000, rapid FlowSonic, measuring range: 1-80 l/min primary/secondary: each 2 x PT1000, rapid Check valve (in the ball valve) primary: 2 x 200 mm wc primary: 2 x 800 mm wc Material Valves and fittings Seals: o-ring Flat sealing check valve Brass Klingersil / EPDM AFM 34, free of asbestos Brass Pipes (AISI 316) Insulation Heat exchanger Admissible medium EPP, λ = W/(m K), fire class B2 Plates + connecting pieces: (AISI 316) Solder: 99.99% pure copper primary: heating water according to VDI 2035 / Ö-Norm H secondary: domestic water with a max. chloride content: < 80 ppm / Ext. PAW 10-32

11 3 Product description 3.3 Technical Data Pumps Grundfos UPM LowFlow Grundfos UPM GEO Length 180 mm Connections 1½" male thread Protection class IP 44 Max. pressure 1.0 MPa (= 10 bars) Max. temperature 95 C TF 95 I (1/1) A A P W 5-87 W Use in WHI freshaqua 44 #1 Prim WHI freshaqua 55 #1 Prim Prim = Primary side (accumulator circuit) 3.4 PWM input signal (solar profile) PWM input signal [%] Pump status Max. < 6 Standby 6-8 Hysteresis 9-15 Min. speed Linear increase in speed from rpm min. to rpm max Max. speed Speed Min. Stop PWM input signal [%] / Ext. PAW 11-32

12 3 Product description 3.5 Hydraulic performance data WHI freshaqua 44 #1 Residual feed pressure or pressure drop [mbars] Flow rate [l/h] Heating UPM LowFlow Circulation UPM CIL Pressure drop DW side WHI freshaqua 55 #1 Residual feed pressure or pressure drop [mbars] Heating UPM GEO Flow rate [l/h] Circulation UPM CIL Pressure drop DW side / Ext. PAW 12-32

13 4 Dimensioning and Planning 4 Dimensioning and Planning The WHI freshaqua is a fresh water station that heats the domestic water according to the continuous flow heater principle. The system must fulfil certain requirements for the trouble-free function of the fresh water station. Take a little time for the planning before the assembly. Due to their construction, the WHI freshaqua modules reduce the precipitation of scale in the heat exchanger. For systems with a high total domestic water hardness and/or high temperatures, a water treatment is recommended, in order to prevent scale formation. Risk of scalding from hot water! WARNING Due to the third party circulation, up to 90 C hot water may run out at the tapping point in the primary circuit. No external pump may be installed between the fresh water station and the buffer tank. The fresh water station must not be connected to a heating circuit distributor. Assembly example Fresh water station with optional circulation kit (item no ) and with optional return distribution In order to guarantee optimum closed-loop control, where possible no hydraulic pressure drop should occur on the primary side (e.g., from the installation of a mud strainer, dirt trap or mixing valve) / Ext. PAW 13-32

14 4 Dimensioning and Planning 4.1 Dimensioning the storage Using the following table, you can calculate the approximate required volume of the buffer tank. Temperature in the buffer tank Hot water temperature set on the controller Required storage volume per litre hot water 50 C 45 C 1.3 litres 45 C 0.8 litres 60 C 50 C 1.0 litres 55 C 1.4 litres 45 C 0.7 litres 70 C 50 C 0.8 litres 55 C 0.9 litres 45 C 0.5 litres 80 C 50 C 0.6 litres 55 C 0.7 litres Calculation example for dimensioning the buffer tank: Buffer tank temperature: 60 C Required tapped flow rate at the tap: 20 l/min DHW temperature set on the controller: 45 C How large does the tank have to be if tapping is carried out for 20 minutes without reheating? 20 l/min x 20 min = 400 l 400 l x 0.8 = 320 l The heated part of the buffer tank must have a volume of 320 litres / Ext. PAW 14-32

15 4 Dimensioning and Planning 4.2 Circulation mode The fresh water stations WHI freshaqua 44 #1 as well as WHI freshaqua 55 #1 can be subsequently equipped with a circulation kit (item no ) for internal retrofitting as an option. Three possible operating modes are stored in the controller for operating the circulation pump (see also operating instructions of controller, menu "Func" / "F02"): Pulse-controlled operation (requirement dependent / demand): The circulation pump is started by briefly opening a hot water tap point (tapping pulse: ~2 seconds). The circulation pump then only runs for a few minutes (can be set). Time-dependent operation: The operation of the circulation pump can be set on a week clock within a freely definable time period. With this operating mode, the circulation is started at the beginning of the set time period. The circulation is switched off after the set time period has elapsed. Temperature-dependent operation: With this operating mode, the circulation is only started if the minimum temperature that can be set on the circulation temperature sensor is not exceeded within the operating period. The circulation is switched off after reaching the nominal temperature that can be set or after the set time period has elapsed. The operating modes can be combined as desired, e.g., time and temperaturedependent operation. In doing so, the circulation is only active if the temperature on the circulation temperature sensor has exceeded and the time window is active. Outside the time window, the circulation pump can also be activated via a tapping mode when the additional pulse controlled operation is activated. NOTICE Damage to property! In its delivery state, the circulation is not yet active (see operating instructions of the controller, menu "Func" / "F02" to "OFF"). As soon as the circulation line has been installed, the operating mode must be selected and pre-set under all circumstances. The revolution speed of the circulation pump must be specified via the PWM signal (factory setting: 40%) / Ext. PAW 15-32

16 5 Installation 5 Installation The domestic water connection must be carried out according to the relevant standards (e.g., DIN 1988)! Hot water Drain valve Safety valve Service water fitting Fresh water station Cold water Non-return valve Test valve Pressure-reducing valve, if necessary Shut-off valve NOTICE Material damage! The safety valve integrated into the station does not replace the safety equipment of the domestic water connection according to DIN The safety valve merely protects the station from excess pressures when maintenance is required. 5.1 Assembly NOTICE WARNING Material damage! In order to avoid damaging the system, the installation site must be dry, structurally safe and frost-free. Furthermore, access to the closed-loop control and safety equipment must be guaranteed at all times during operation! If tapping points are connected to the same network as the fresh water station, in which pressure surges are possible (e.g., flushing valves, washing machines or dishwashers), we recommend the installation of water hammer dampers near the device causing the pressure surges. Risk to life and limb due to electric shock! Prior to performing electrical work on the controller, de-energise the system. For more information, see enclosed installation and operation instructions of the station controller. Connect the fresh water station to the power supply system (230 V, 50 Hz) only after completing all installation tasks, filling and flushing. This avoids an unintentional start of the motors / Ext. PAW 16-32

17 5 Installation 1. Determine the installation location of the fresh water station near to the buffer tank. With long connecting lines, the transfer capacity is reduced due to higher pressure drops. 2. For assembly, a drilling pattern can be used as mounting aid. This is available on the station. 3. Transfer the dimensions for the drill holes onto the wall. 4. Drill the holes and insert the enclosed wall plugs. Make sure that the ground has sufficient load-carrying capacity. 5. Screw the screws into the plug until it protrudes about 40 mm from the wall. 6. Remove the station from the packaging. 7. Pull off the front shell. 8. Hang the fresh water station on the screws. Tighten the screws so that the insulation on the sides rest against the wall. 5.2 Connection Pipe the fresh water station with the system according to the diagram below. Pipe gap from the wall (primary) = 95 mm 1 Primary side: return to buffer tank Connection WHI freshaqua 44 #1: 1½" male thread, flat sealing Connection WHI freshaqua 55 #1: 2" male thread, flat sealing Piping: WHI freshaqua 44 #1: min. DN 25, 28 x 1.5 mm, WHI freshaqua 55 #1: min. DN 32, 35 x 1.5 mm 2 Secondary side: cold water inlet Connection WHI freshaqua 44 #1: 1" male thread, flat sealing Connection WHI freshaqua 55 #1: 1¼" male thread, flat sealing 3 Secondary side: hot water outlet Connection WHI freshaqua 44 #1: 1" male thread, flat sealing Connection WHI freshaqua 55 #1: 1¼" male thread, flat sealing 4 Primary side: supply from buffer tank Connection WHI freshaqua 44 #1: 1½" male thread, flat sealing Connection WHI freshaqua 55 #1: 2" male thread, flat sealing Piping: WHI freshaqua 44 #1: min. DN 25, 28 x 1.5 mm, WHI freshaqua 55 #1: min. DN 32, 35 x 1.5 mm Pipe gap from the wall (secondary) = 167 mm / Ext. PAW 17-32

18 6 Operation 5.3 Controller connection Risk to life and limb due to electric shock! Prior to performing electrical work on the controller, de-energise the system. WARNING For more information, see enclosed installation and operation instructions of the station controller. Connect the fresh water station to the power supply system (230 V, 50 Hz) only after completing all installation tasks, filling and flushing. This avoids an unintentional start of the motors. The plug-in pump lines are permanently supplied with a mains voltage of 230 V and cannot be switched off via the controller. The fresh water station is pre-wired in the factory. When using the circulation pump, its connection can be obtained from the enclosed assembly instructions. 6 Operation A detailed description of the operation of the controller can be found in the enclosed controller manual / Ext. PAW 18-32

19 7 Commissioning 7 Commissioning Observe the following safety instructions regarding the commissioning of the station: NOTICE Note! Open the valves in the lines and in the module slowly in order to avoid pressure surges. Check valve operation The ball valves (A) and (K) in the primary circuit are equipped with a check valve in order to prevent an undesired gravity circulation. The check valve must be open for venting and flushing the system. For this purpose, turn the ball valve to position 45. The check valve is not in operation. All ball valves and valves must be open completely for operating the system (position 0 ). Ball valve with integrated check valve (Normal direction of flow in the picture: downstream) Check valve in operation, flow in flow direction only Check valve not in operation, Ball valve closed, flow in both directions. no flow. To actuate the ball valve, a handle is included in the delivery / Ext. PAW 19-32

20 7 Commissioning 7.1 Filling the primary circuit Risk of scalding from hot water! WARNING The system is under pressure. By opening the fill and drain valve lever on the fill and drain valve, up to 90 C hot water may run out that could lead to personal injuries. Open the fill and drain valve slowly and with sufficient distance. With (partially) filled tank 1. Set the bypass (C) to "MAN" (for WHI freshaqua 55 #1 only). 2. Open ball valve (K) slowly by turning it to the 0 position. 3. Fill the tank with the filling valves and fittings installed on-site until an operating pressure of approx. 1.5 bars* is reached. Use heating water according to VDI 2035 / ÖNorm H Actuate the vent valve (I) carefully and allow the air to escape. 5. Close the vent valve (I). 6. Close ball valve (K) by turning it to the 90 position. 7. After venting, check the operating pressure of the tank and where applicable, increase the pressure. 8. Open ball valves (A) and (K) completely by turning them to the 0 position. Primary circuit *1.5 bars in the primary circuit = recommended minimum value Decisive factors for the pressure are also the design-related system pressures and the heating system components! / Ext. PAW 20-32

21 7 Commissioning 7.2 Commissioning the controller WARNING Risk to life and limb due to electric shock! Check whether the sensors and pumps have been connected to the controller and the controller housing is closed. Do not apply voltage to the controller before that. Primary circuit 1. Ensure for the correct integration of the fresh water station into the potential equalisation of the system. 2. Connect the fresh water station to the power supply system (230 V, 50 Hz). 3. Slowly open the piston valve on the secondary side (D) and (E). 4. Remove the front panel of the controller (see controller instructions, page 5). 5. In the selection menu of the controller, select manual mode ("H1"). Switch on the PWM signal of the pump ("100 %"). 6. Allow the pump to run for a few minutes in order to vent the fresh water station. 7. If you can still hear air sounds after this, actuate vent valve (I) carefully when the pump is still running and allow the air to escape. 8. Set the bypass (C) to "MAN", in order to vent the bypass line (for WHI freshaqua 55 #1 only). 9. Set the bypass (C) to "AUTO" (for WHI freshaqua 55 #1 only). 10. If you cannot hear any air noises anymore, turn off the pump. For this purpose, select manual mode ("H1") in the selection menu of the controller. 11. Set the pump to automatic mode ("A"). 12. Open the warm domestic water tapping point (e.g., tap) with a flow rate of minimum 10 l/min and allow the water to run for approx. 2 minutes in order to vent the secondary circuit. Then close all tapping points in the secondary circuit. 13. Check the station for leaks. 14. Set the desired warm domestic water temperature on the controller (see page 24). 15. The fresh water station WHI freshaqua 44 #1 or 55 #1 is now ready for operation. 16. The station controller "learns" the system-specific control parameters during longer tapping operations. This "learning process" is continuously translated into practice. To achieve immediately optimum comfort, once commissioning is complete, water should be tapped on a few different service water fittings for about 30 s. Secondary circuit / Ext. PAW 21-32

22 7 Commissioning 7.3 Maximum tapped flow rate The following diagram shows the maximum tapped flow rate depending on the tank temperature with a pre-set hot water temperature of 45 C at the tap point. The integrated closed-loop control prevents the temperature from dropping as long as the maximum flow rate is not exceeded. WHI freshaqua 55 #1 Tapped flow rate [l/min] Power [kw] WHI freshaqua 44 #1 Hot water temperature: 45 C Buffer tank temperature Boundary conditions: Cold water temperature: 10 C Max. pressure loss on the domestic water side of the WHI freshaqua: 1000 mbars The correlation between the individual variables hot water temperature, tapped flow rate and buffer tank temperature is explained and shown on the basis of the following examples, such as which effect they have on the transmission power of the WHI freshaqua. Example 1 Hot water temperature at the tapping point: 45 C Temperature in the buffer tank: 60 C WHI freshaqua 44 #1: maximum tapped flow rate: 50 l/min, transmission power: 121 kw WHI freshaqua 55 #1: maximum tapped flow rate: 67 l/min, transmission power: 163 kw Example 2 Hot water temperature at the tapping point: 45 C Maximum tapped flow rate: 60 l/min WHI freshaqua 44 #1: required temperature in the buffer tank: ~70 C, transmission power: 145 kw WHI freshaqua 55 #1: required temperature in the buffer tank: ~60 C, transmission power: 145 kw / Ext. PAW 22-32

23 7 Commissioning The following diagram shows the maximum tapped flow rate at a hot water temperature of 45 C at the tap point after adding 10 C cold water. The hot water temperature set at the controller is 60 C. WHI freshaqua 55 #1 Tapped flow rate [l/min] Power [kw] WHI freshaqua 44 #1 Hot water temperature: 45 C, after heating to 60 C and adding cold water (10 C) Buffer tank temperature Boundary conditions: Cold water temperature: 10 C Example 1 Hot water temperature on the controller: 60 C Temperature in the buffer tank: 70 C WHI freshaqua 44 #1 maximum tapped flow rate: 53 l/min, transmission power: 129 kw WHI freshaqua 55 #1: maximum tapped flow rate: 72 l/min, transmission power: 176 kw Example 2 Hot water temperature on the controller: 60 C Maximum tapped flow rate: 60 l/min WHI freshaqua 44 #1: required temperature in the buffer tank: ~75 C, transmission power: 155 kw WHI freshaqua 55 #1: required temperature in the buffer tank: ~65 C, transmission power: 155 kw / Ext. PAW 23-32

24 7 Commissioning 7.4 Setting the temperature The desired (maximum) domestic hot water temperature is set on the controller under "Para" (see controller manual, page 24). WARNING Risk of scalding from hot water! In order to prevent scalding at the tap, the maximum hot water temperature should not exceed 60 C. Tip for convenient optimisation: at high buffer temperatures (e.g., solar operation), the hot water temperature should be set as high as possible (max. 60 C). Primary side The temperature in the buffer tank required on the primary side depends on the hot water temperature as well as the tapping quantity required. The temperature in the buffer tank must be at least 5 K above the desired hot water temperature. Secondary side The possible tapped flow rate [l/min] at the tap depends on the water temperature set on the controller and the temperature available in the tank. The recommended maximum domestic water flow rate through the WHI freshaqua 44 #1 is 65 l/min. The flow rate through WHI freshaqua 55 #1 is 88 l/min. System-related large changes in the domestic water flow rate result in variations of the hot water outlet temperature. However, these variations are usually smoothed by the pipework in the building or by admixing water at the service water fittings / Ext. PAW 24-32

25 7 Commissioning The following table shows the relationship between the tank temperature and the corresponding maximum tapped flow rate at 45 C on the valve and fitting (e.g., single-lever mixer). If the hot water temperature set on the controller is more than 45 C, the tapped flow rate comprises a mixture of hot and cold water. The transmission power specified for this is required to heat the water quantity of the tapped flow rate [l/min] from 10 C to 45 C. Temperature in the buffer tank Hot water temperature set on the controller Max. flow rate from the WHI freshaqua at the set hot water temperature Max. tapped flow rate at the tap for 45 C hot water temperature Transmission power of the WHI freshaqua WHI freshaqua 44 #1 WHI freshaqua 55 #1 WHI freshaqua 44 #1 WHI freshaqua 55 #1 WHI freshaqua 44 #1 WHI freshaqua 55 #1 50 C 45 C 32 l/min 44 l/min kw 108 kw 45 C 50 l/min 67 l/min kw 163 kw 60 C 50 C 40 l/min 54 l/min 45 l/min 61 l/min 111 kw 151 kw 55 C 30 l/min 42 l/min 39 l/min 63 l/min 95 kw 130 kw 45 C 64 l/min 86 l/min kw 208 kw 70 C 50 C 54 l/min 72 l/min 61 l/min 82 l/min 149 kw 201 kw 55 C 45 l/min 61 l/min 57 l/min 78 l/min 141 kw 190 kw 60 C 37 l/min 51 l/min 53 l/min 72 l/min 129 kw 176 kw 45 C 65* l/min 88 l/min** kw 214 kw 80 C 50 C 65* l/min 88 l/min** 74 l/min 99 l/min 181 kw 243 kw 55 C 57 l/min 76 l/min 72 l/min 97 l/min 176 kw 237 kw 60 C 49 l/min 66 l/min 69 l/min 93 l/min 169 kw 228 kw at a cold water temperature of 10 C, reheating not taken into account *maximum flow rate: 65 l/min, pressure loss of the WHI freshaqua 44 #1 in doing so 1000 mbars (higher values hydraulically only possible to a limited extent, measuring limit of the flow rate sensor ~133 l/min) **maximum flow rate: 88 l/min, pressure loss of the WHI freshaqua 55 #1 in doing so 1000 mbars (higher values hydraulically only possible to a limited extent, measuring limit of the flow rate sensor ~133 l/min) / Ext. PAW 25-32