REMKO WKF -compact Series Скачать руководство пользователя страница 38

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Heating capacity WKF 180 Duo at an inlet temperature 35 °C

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35,0

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45,0

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Fig. 37: Heating capacity WKF 180 Duo at an inlet temperature 35 °C

A: Outdoor temperature

B: Heating capacity

C: Rated frequency / n-max = max. frequency

Heizleistung WKF 180 Duo at an inlet temperature 45 °C

[°C]

]

0,0

5,0

10,0

15,0

20,0

25,0

30,0

35,0

40,0

-16

-14

-12

-10

-8

-6

-4

-2

n-max

Fig. 38: Heating capacity WKF 180 Duo at an inlet temperature 45 °C

A: Outdoor temperature

B: Heating capacity

C: Rated frequency / n-max = max. frequency

REMKO WKF / WKF-compact

Содержание WKF -compact Series

Страница 1: ...y and operating instructions Read the instructions prior to performing any task REMKO WKF WKF compact 85 120 180 WKF 120 180 Duo Inverter heat pumps Instructions for the Technician 0105 2015 05 Edition 1 en_GB ...

Страница 2: ...ig inal Read these operating instructions carefully before commis sioning using this device These instructions are an integral part of the system and must always be kept near or on the device Subject to modifications No liability accepted for errors or mis prints ...

Страница 3: ...nsions outdoor module 17 2 8 Unit dimensions indoor modules 17 2 9 Heat pump service limits in monovalent mode 22 2 10 Pump characteristic curves indoor module charging pump 24 2 11 Overall sound pressure levels for outdoor modules 25 2 12 Characteristic curves 30 3 Structure and function 45 3 1 The heat pump in general 45 3 2 WKF series 51 3 3 WKF compact series 51 4 Installation instructions 52 ...

Страница 4: ... WKF WKF compact 120 91 15 5 Exploded view outdoor modules WKF WKF compact 180 92 15 6 Spare parts list outdoor module WKF WKF compact 180 93 15 7 Exploded view outdoor module WKF 120 Duo 94 15 8 Spare parts list outdoor module WKF 120 Duo 95 15 9 Exploded view outdoor unit WKF 180 Duo 96 15 10 Spare parts list for the WKF 180 Duo 97 15 11 Exploded view indoor module WKF 85 120 180 98 15 12 Spare ...

Страница 5: ... may be fatal or cause serious injury WARNING This combination of symbol and signal word warns of a potentially hazardous situation which if not avoided may be fatal or cause serious injury CAUTION This combination of symbol and signal word warns of a potentially hazardous situation which if not avoided may cause injury or mate rial and environmental damage NOTICE This combination of symbol and si...

Страница 6: ...s n Mobile units must be set up securely on suit able surfaces and in an upright position Sta tionary units must be permanently installed for operation n The units and components should not be oper ated in areas where there is a heightened risk of damage Observe the minimum clearances n The units and components must be kept at an adequate distance from flammable explosive combustible abrasive and ...

Страница 7: ...rotection and recycling Disposal of packaging All products are packed for transport in environ mentally friendly materials Make a valuable contri bution to reducing waste and sustaining raw mate rials Only dispose of packaging at approved collection points Disposal of equipment and components Only recyclable materials are used in the manufac ture of the devices and components Help protect the envi...

Страница 8: ...y compressor frequency COP 1 for A 7 W35 kW Hz COP 4 31 54 2 77 Heating capacity compressor frequency COP 1 for A 15 W35 kW Hz COP 3 42 54 2 28 Heating capacity compressor frequency COP 1 for A7 W45 kW Hz COP 6 74 56 3 23 Heating capacity compressor frequency COP 1 for A 7 W45 kW Hz COP 3 94 56 2 13 Heating capacity compressor frequency COP 1 for A7 W55 kW Hz COP Heating capacity compressor freque...

Страница 9: ...ate bar 0 1 Pressure loss external kPa 80 Air nominal flow rate outdoor module m h 2760 Max operating pressure water bar 3 Hydraulic connection supply return Inches mm 1 25 4 Sound power level in accordance with DIN EN 12102 2008 09 and ISO 9614 2 dB A 64 0 Sound pressure level LpA out mod 3 dB A 38 5 Dimensions indoor module h w d mm 500 800 500 1928 800 790 Dimensions outdoor module h w d mm 800...

Страница 10: ...act 85 Energy efficiency ratio heating 35 C A Energy efficiency ratio hot water XL A Nominal heating power prated kW 6 0 Room heating energy efficiency hs 35 C 164 Yearly energy consumption QHE 35 C 4 1959 Colder condition 3 Series WKF 85 WKF compact 85 Energy efficiency ratio heating 35 C A Energy efficiency ratio hot water XL A Nominal heating power prated kW 9 0 Room heating energy efficiency h...

Страница 11: ...COP 6 14 61 2 89 8 20 56 2 87 Heating capacity compressor frequency COP 1 for A 15 W35 kW Hz COP 4 82 61 2 39 6 36 56 2 40 Heating capacity compressor frequency COP 1 for A7 W45 kW Hz COP 10 15 58 3 67 12 27 58 3 46 Heating capacity compressor frequency COP 1 for A7 W55 kW Hz COP 8 99 61 2 78 12 85 56 2 92 Heating capacity compressor frequency COP 1 for A 7 W55 kW Hz COP 4 63 61 1 79 6 99 56 1 94 ...

Страница 12: ...e outdoor module m h 3700 5400 Max operating pressure water bar 3 Hydraulic connection supply return Zoll mm 1 1 4 31 8 Sound power level in accordance with DIN EN 12102 2008 09 and ISO 9614 2 dB A 67 9 68 3 Sound pressure level LpA out mod 3 dB A 42 2 42 4 Dimensions indoor module h w d mm 500 800 500 1928 800 790 500 800 500 1928 800 790 Dimensions outdoor module h w d mm 998 940 330 1420 940 33...

Страница 13: ...ompact 180 Energy efficiency ratio heating 35 C 55 C A A A A Energy efficiency ratio hot water XL A A Nominal heating power prated kW 9 0 12 0 Room heating energy efficiency hs 35 C 55 C 165 123 180 143 Yearly energy consumption QHE 35 C 55 C 4 2968 3354 3803 5349 Colder condition 3 Series WKF 120 WKF compact 120 WKF 180 WKF compact 180 Energy efficiency ratio heating 35 C 55 C A A A A Energy effi...

Страница 14: ...5 W35 kW Hz COP 9 64 61 2 39 12 72 56 2 40 Heating capacity compressor frequency COP 1 for A7 W45 kW Hz COP 20 30 58 3 67 24 54 56 3 46 Heating capacity compressor frequency COP 1 for A7 W55 kW Hz COP 17 98 61 2 78 25 70 56 2 92 Heating capacity compressor frequency COP 1 for A7 W55 kW Hz COP 9 26 61 1 79 13 98 56 1 94 Cooling capacity min max kW 3 30 18 00 5 50 32 00 Cooling capacity compressor f...

Страница 15: ...ow rate bar 0 10 Pressure loss external kPa 80 Airflow volume per outdoor unit m h 3500 5400 Max operating pressure water bar 3 Hydraulic connection inlet return Inches 1 1 2 AG Recommended pipe dimension Cu pipe mm 42 Sound pressure level LpA outdoor unit 3 dB A 42 42 Sound power level acc to DIN EN 12102 2008 09 and ISO 9614 2 per outdoor unit dB A 67 9 68 3 Dimensions indoor unit height width d...

Страница 16: ...ncy ratio heating 35 C 55 C A A A A Energy efficiency ratio hot water XL A A Nominal heating power prated kW 17 0 25 0 Room heating energy efficiency hs 35 C 55 C 184 134 194 152 Yearly energy consumption QHE 35 C 55 C 4 4897 4953 6981 7338 Colder condition 3 Series WKF 120 Duo WKF 180 Duo Energy efficiency ratio heating 35 C 55 C A A A A Energy efficiency ratio hot water XL A A Nominal heating po...

Страница 17: ...0 660 346 5 WKF WKF compact 120 940 1010 330 620 360 WKF WKF compact 180 940 1430 330 620 350 WKF 120 Duo 940 1010 330 620 360 WKF 180 Duo 940 1430 330 620 350 2 8 Unit dimensions indoor modules Unit dimensions indoor modules WKF 85 120 180 792 500 500 650 Fig 2 Unit dimensions indoor modules series WKF 85 120 180 all dimensions in mm 17 ...

Страница 18: ...connections WKF 85 120 180 A B 2 1 4 3 5 6 7 8 10 9 2 1 4 3 5 6 7 8 10 9 Fig 4 Designations on the pipe connections WKF 85 120 180 A Bivalent mode B Monovalent mode 1 Circulation 2 Cold water inlet 3 Inlet heater 4 Warm water 5 Return heater 6 Refrigerant liquid pipe 3 8 7 Refrigerant heat gas pipe 5 8 8 2nd heat generator return Outlet heat pump 9 Safety assembly 10 2nd heat generator inletf Inle...

Страница 19: ...Unit dimensions indoor modules WKF WKF compact 85 120 180 2100 10 1928 10 792 43 792 43 Fig 5 Unit dimensions indoor modules WKF compact 85 120 180 all dimensions in mm 19 ...

Страница 20: ... pipe connections WKF compact 85 120 180 A B 2 1 4 3 5 6 7 8 10 9 11 2 1 4 3 5 6 7 8 10 9 11 Fig 7 Designations of the pipe connections WKF compact 85 120 180 A Bivalent mode B Monovalent mode 1 Circulation 2 Cold water inlet 3 Inlet heater 4 Warm water 5 Return heater 6 Refrigerant liquid pipe 3 8 7 Refrigerant heat gas pipe 5 8 8 2nd heat generator return Outlet heat pump 9 Safety assembly 10 2n...

Страница 21: ... 1 2 3 4 5 6 7 8 Fig 9 Arrangement of the pipe sockets and designations on the pipe connections WKF 120 180 Duo all dimensions in mm A Pipe connection arrangement B Designations of the pipe connections 1 Heat pump inlet 1 1 2 2 Heat pump return 1 1 2 3 Refrigerant heat gas pipe Outdoor unit A 5 8 4 Refrigerant liquid pipe Outdoor unit B 3 8 5 Refrigerant liquid pipe Outdoor unit A 3 8 6 Refrigeran...

Страница 22: ...rature C 22 40 50 50 50 22 20 C 22 C 20 C 43 C 10 55 35 55 35 C 22 C 15 C 20 C 25 C 30 C 35 C 40 C 45 C 50 C 55 C 60 C 30 C 20 C 10 C 0 C 10 C 20 C 30 C 40 C Vorlauftemperatur C Außentemperatur C Einsatzgrenzen WKF 120 VT C C AT Fig 11 Service limits and test points WKF WKF compact 120 AT Outside temperature VT Inlet temperature Outdoor temperature C 20 20 10 20 35 35 Inlet temperature C 22 43 55 ...

Страница 23: ... C 22 42 55 55 55 22 20 C 22 C 20 C 43 C 10 55 35 55 35 C 22 C 15 C 20 C 25 C 30 C 35 C 40 C 45 C 50 C 55 C 60 C 30 C 20 C 10 C 0 C 10 C 20 C 30 C 40 C Vorlauftemperatur C Außentemperatur C Einsatzgrenzen WKF 120 VT C C AT Fig 13 Service limits and test points WKF 120 Duo AT Outside temperature VT Inlet temperature Outdoor temperature C 20 20 10 20 35 35 Inlet temperature C 22 43 55 55 55 22 NOTE ...

Страница 24: ...ristic curves indoor module charging pump 0 5 10 15 20 25 30 35 40 45 50 0 20 40 60 80 100 120 140 160 20 40 60 80 100 l min W 2 1 3 A B Fig 15 Circulation pump Grundfoss UPML 25 105 180 PWM power range 1 Power consumption W 2 Volume flow l mim 3 Activation A Characteristic curve volume flow l mim B Characteristic curve power consumption W External control via analogical in PWM signal Tolerances o...

Страница 25: ...34 7 47 4 39 9 46 9 44 3 40 4 47 3 48 2 48 8 FPI dB 14 7 8 2 8 8 5 2 3 5 1 1 3 0 6 2 0 4 7 Middle frequency Hz 200 250 315 400 500 630 800 1000 1250 LI dBA 43 3 54 3 46 1 41 6 41 9 40 8 41 0 41 8 37 2 LWo dBA 52 4 60 5 55 3 50 8 51 0 50 0 50 1 50 9 46 3 FPI dB 6 3 4 0 7 4 10 0 10 9 12 8 12 0 11 1 13 0 Middle frequency Hz 1600 2000 2500 3150 4000 5000 6300 8000 10000 LI dBA 34 6 21 9 32 1 32 3 26 5...

Страница 26: ...4 4 40 6 LWo dBA 37 5 50 8 48 2 41 3 55 2 43 4 49 9 54 3 50 5 FPI dB 14 3 8 3 8 5 6 6 3 6 2 0 0 2 0 7 2 6 Middle frequency Hz 200 250 315 400 500 630 800 1000 1250 LI dBA 45 0 52 8 45 8 46 0 44 7 47 5 47 2 49 1 44 4 LWo dBA 54 9 62 7 55 7 55 9 54 6 57 4 57 1 59 0 54 3 FPI dB 4 3 4 3 5 6 6 7 7 1 7 1 11 2 6 0 6 0 Middle frequency Hz 1600 2000 2500 3150 4000 5000 6300 8000 10000 LI dBA 42 4 40 0 37 3...

Страница 27: ...7 9 47 9 60 4 56 3 61 1 FPI dB 11 6 9 2 7 7 5 4 3 2 2 0 0 0 1 1 2 1 Middle frequency Hz 200 250 315 400 500 630 800 1000 1250 LI dBA 44 3 44 6 45 8 44 8 44 9 46 4 47 2 48 4 41 9 LWo dBA 54 8 55 1 56 4 55 3 55 4 56 9 57 8 58 9 52 4 FPI dB 6 1 6 4 8 7 9 4 9 6 9 2 11 6 8 4 10 0 Middle frequency Hz 1600 2000 2500 3150 4000 5000 6300 8000 10000 LI dBA 38 7 35 5 33 1 30 4 26 5 21 6 17 5 18 1 8 8 LWo dBA...

Страница 28: ... LWo dBA 37 5 50 8 48 2 41 3 55 2 43 4 49 9 54 3 50 5 FPI dB 14 3 8 3 8 5 6 6 3 6 2 0 0 2 0 7 2 6 Middle frequency Hz 200 250 315 400 500 630 800 1000 1250 LI dBA 45 0 52 8 45 8 46 0 44 7 47 5 47 2 49 1 44 4 LWo dBA 54 9 62 7 55 7 55 9 54 6 57 4 57 1 59 0 54 3 FPI dB 4 3 4 3 5 6 6 7 7 1 7 1 11 2 6 0 6 0 Middle frequency Hz 1600 2000 2500 3150 4000 5000 6300 8000 10000 LI dBA 42 4 40 0 37 3 34 9 31...

Страница 29: ... 60 4 56 3 61 1 FPI dB 11 6 9 2 7 7 5 4 3 2 2 0 0 0 1 1 2 1 Middle frequency Hz 200 250 315 400 500 630 800 1000 1250 LI dBA 44 3 44 6 45 8 44 8 44 9 46 4 47 2 48 4 41 9 LWo dBA 54 8 55 1 56 4 55 3 55 4 56 9 57 8 58 9 52 4 FPI dB 6 1 6 4 8 7 9 4 9 6 9 2 11 6 8 4 10 0 Middle frequency Hz 1600 2000 2500 3150 4000 5000 6300 8000 10000 LI dBA 38 7 35 5 33 1 30 4 26 5 21 6 17 5 18 1 8 8 LWo dBA 49 2 46...

Страница 30: ...KF compact 85 at an inlet temperature 35 C A Outdoor temperature B Heating capacity C Rated frequency Heating capacity WKF WKF compact 85 at an inlet temperature 45 C 0 1 2 3 4 5 6 7 8 9 10 11 12 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 n max 88 Hz n max 73 Hz n max 58 Hz C kW 54 Hz A B C n max n min Fig 22 Heating capacity WKF WKF compact 85 at an i...

Страница 31: ...n Fig 23 Heating capacity WKF WKF compact 85 at an inlet temperature 50 C A Outdoor temperature B Heating capacity C Rated frequency COP WKF WKF compact 85 at an inlet temperature 35 C 45 C und 50 C C COP 0 1 2 3 4 5 6 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 35 C 45 C 50 C A D D D Fig 24 COP WKF WKF compact 85 at an inlet temperature 35 C 45 C und 5...

Страница 32: ... at an inlet temperature 35 C A Outdoor temperature B Heating capacity C Rated frequency Heating capacity WKF WKF compact 120 at an inlet temperature 45 C C kW 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 n max 88 Hz n max 73 Hz n max 58 Hz 54 Hz A B C n max n min Fig 26 Heating capacity WKF WKF compact 120 at an inl...

Страница 33: ... min Fig 27 Heating capacity WKF WKF compact 120 at an inlet temperature 55 C A Outdoor temperature B Heating capacity C Rated frequency COP WKF WKF compact 120 at an inlet temperature 35 C 45 C und 55 C C COP 0 1 2 3 4 5 6 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 35 C 45 C 55 C A D D D Fig 28 COP WKF WKF compact 120 at an inlet temperature 35 C 45 C...

Страница 34: ... at an inlet temperature 35 C A Outdoor temperature B Heating capacity C Rated frequency Heating capacity WKF WKF compact 180 at an inlet temperature 45 C C kW 0 2 4 6 8 10 12 14 16 18 20 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 n max 88 Hz n max 73 Hz n max 58 Hz A B C n max n min Fig 30 Heating capacity WKF WKF compact 180 at an inlet temperature 4...

Страница 35: ... 31 Heating capacity WKF WKF compact 180 at an inlet temperature 55 C A Outdoor temperature B Heating capacity C Rated frequency COP WKF WKF compact 180 at an inlet temperature 35 C 45 C und 55 C C COP 0 1 2 3 4 5 6 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 35 C 45 C 55 C A D D D Fig 32 COP WKF WKF compact 180 at an inlet temperature 35 C 45 C und 55 ...

Страница 36: ...ure 35 C A Outdoor temperature B Heating capacity C Rated frequency n max max frequency Heizleistung WKF 120 Duo at an inlet temperature 45 C C kW 0 0 5 0 10 0 15 0 20 0 25 0 30 0 35 0 40 0 16 14 12 10 8 6 4 2 0 2 4 6 8 10 12 14 16 18 20 A B C n max Fig 34 Heating capacity WKF 120 Duo at an inlet temperature 45 C A Outdoor temperature B Heating capacity C Rated frequency n max max frequency REMKO ...

Страница 37: ...let temperature 55 C A Outdoor temperature B Heating capacity C Rated frequency n max max frequency COP WKF 120 Duo at an inlet temperature 35 C 45 C und 55 C C COP 0 1 2 3 4 5 6 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 35 C 45 C 55 C A D D D Fig 36 COP WKF 120 Duo at an inlet temperature 35 C 45 C und 55 C A Outdoor temperature D Inlet temperature 3...

Страница 38: ...perature 35 C A Outdoor temperature B Heating capacity C Rated frequency n max max frequency Heizleistung WKF 180 Duo at an inlet temperature 45 C C kW 0 0 5 0 10 0 15 0 20 0 25 0 30 0 35 0 40 0 16 14 12 10 8 6 4 2 0 2 4 6 8 10 12 14 16 18 20 A B C n max Fig 38 Heating capacity WKF 180 Duo at an inlet temperature 45 C A Outdoor temperature B Heating capacity C Rated frequency n max max frequency R...

Страница 39: ...an inlet temperature 55 C A Outdoor temperature B Heating capacity C Rated frequency n max max frequency COP WKF 180 Duo at an inlet temperature 35 C 45 C und 55 C C COP 0 1 2 3 4 5 6 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 35 C 45 C 55 C A D D D Fig 40 COP WKF 180 Duo at an inlet temperature 35 C 45 C und 55 C A Outdoor temperature D Inlet temperat...

Страница 40: ...0 5 0 5 10 15 20 25 30 0 5 10 15 20 25 30 35 40 45 50 A B m m 100 99 97 95 95 95 95 92 92 92 30 m 0 m 30 m Fig 41 Heating capacity losses for WKF WKF compact 85 A Difference in elevation B Length of refrigerant piping Cooling capacity losses for WKF WKF compact 85 25 30 15 20 10 5 0 5 10 15 20 25 30 0 5 10 15 20 25 30 35 40 45 50 A B m m 100 98 95 95 90 90 90 87 87 87 30 m 0 m 30 m Fig 42 Cooling ...

Страница 41: ... capacity losses for WKF WKF compact 120 A Difference in elevation B Length of refrigerant piping Cooling capacity losses for WKF WKF compact 120 25 30 15 20 10 5 0 5 10 15 20 25 30 0 5 10 15 20 25 30 35 40 45 50 A B m m 100 98 95 95 89 30 m 0 m 30 m 92 Fig 44 Cooling capacity losses for WKF WKF compact 120 A Difference in elevation B Length of refrigerant piping 41 ...

Страница 42: ...osses for WKF WKF compact 180 A Difference in elevation B Length of refrigerant piping Cooling capacity losses for WKF WKF compact 180 25 30 15 20 10 5 0 5 10 15 20 25 30 0 5 10 15 20 25 30 35 40 45 50 A B m m 100 90 83 30 m 0 m 30 m 80 55 60 65 70 75 86 Fig 46 Cooling capacity losses for WKF WKF compact 180 A Difference in elevation B Length of refrigerant piping REMKO WKF WKF compact 42 ...

Страница 43: ... Heating capacity losses for WKF 120 Duo A Difference in elevation B Length of refrigerant piping Cooling capacity losses for WKF 120 Duo 25 30 15 20 10 5 0 5 10 15 20 25 30 0 5 10 15 20 25 30 35 40 45 50 A B m m 100 98 95 95 89 30 m 0 m 30 m 92 Fig 48 Cooling capacity losses for WKF 120 Duo A Difference in elevation B Length of refrigerant piping 43 ...

Страница 44: ...pacity losses for WKF 180 Duo A Difference in elevation B Length of refrigerant piping Cooling capacity losses for WKF 180 Duo 25 30 15 20 10 5 0 5 10 15 20 25 30 0 5 10 15 20 25 30 35 40 45 50 A B m m 100 90 83 30 m 0 m 30 m 80 55 60 65 70 75 86 Fig 50 Cooling capacity losses for WKF 180 Duo A Difference in elevation B Length of refrigerant piping REMKO WKF WKF compact 44 ...

Страница 45: ... Economical and environmentally conscious heating The burning of fossil based energy sources in order to generate power creates severe conse quences for the environment A high percentage of fossil fuels is also problematic due to the limited resources of oil and gas and the price increases resulting from this For this reason many people today are thinking both economically and environ mentally con...

Страница 46: ...rcuit consist of an evaporator a compressor a condenser and an expansion valve In a finned evaporator the refrigerant evaporates both because of lower pressure and because of lower heat source tem peratures through absorption of energy from the environment In the compressor the refrigerant is brought to a higher pressure and temperature by the application of electrical energy Next the hot refriger...

Страница 47: ...emely varied thermal transmission coefficients the so called K value Also required are the room temper ature and the standard outdoor temperature that is the lowest outdoor temperature on average that will occur during the year The equation for calcu lating the transmission heat requirement is Q A x U x tR tA and must be calculated separately for all room enclosure surfaces The infiltration heat r...

Страница 48: ...hold for old building according to VDI 4650 Outdoor temperature C Bivalent temperature Standard outdoor temperature Fig 53 Heating capacity diagramm of the heat pump WKF WKF compact 180 Characteristics of REMKO inverter heat pumps Outdoor air as a heat source An air water heat pump absorbs energy from the outdoor air as its heat source and transmits this to the heating system They have the followi...

Страница 49: ...on below a specified temperature and turns off when this tem perature is reached This kind of heat regulation is very inefficient Heat regulation in the Remko inverter heat pump is modulated to the actual need The electronics system has an integrated frequency converter which serves to modify the condenser speed and the speed of the blower as required The condenser works at a higher speed when und...

Страница 50: ...Under dynamic cooling the refrigerating capacity is actively transferred to the indoor air This is undertaken by means of water based REMKO fan convectors In doing so it is desirable that the inlet temperatures are under the dewpoint in order to transfer a higher refrigerating capacity and to dehumidify the indoor air Passive cooling refers to the absorption of heat via cooled floors walls or ceil...

Страница 51: ...er tank is always required its size depending on the type and the power of the second heat source On the one hand the buffer tank prevents short run times for the heat pump and on the other hand that sufficient defrosting energy is available 3 3 WKF compact series In addition the indoor module of the WKF compact series is fitted with an enamelled 300 L domestic water storage An auxiliary electric ...

Страница 52: ... Common return pipe DN 25 KA1 Condensate drain AM must be designed to be frost proof KA2 Condensate drain IM KML Refrigerant lines 3 8 and 5 8 NAM Mains supply AM 230V 1 50Hz 16 A e g 3x1 5 mm2 NIM Mains supply IM 230V 1 50Hz 16A e g 3x1 5 mm2 NZ1 Mains cable electric auxiliary heater e g 5x2 5 mm2 NZ2 Mains cable electric auxiliary heater optional e g 5x2 5 mm2 STL Control cable e g 2x1mm2 VEN Fa...

Страница 53: ...eturn pipe DN 25 KA1 Condensate drain AM must be designed to be frost proof KA2 Condensate drain IM KML Refrigerant lines 3 8 and 5 8 NAM Mains supply AM 230V 3 50Hz 20 A e g 3x2 5 mm2 NIM Mains supply IM 230V 1 50Hz 16A e g 3x1 5 mm2 NZ1 Mains cable electric auxiliary heater e g 5x2 5 mm2 NZ2 Mains cable electric auxiliary heater optional e g 5x2 5 mm2 STL Control cable e g 2x1mm2 VEN Fan VHZ Inl...

Страница 54: ...pe DN 25 KA1 Condensate drain AM must be designed to be frost proof KA2 Condensate drain IM KML Refrigerant lines 3 8 and 5 8 NAM Mains supply AM 400V 3 50Hz 3x16 A e g 5x1 5 mm2 NIM Mains supply IM 230V 1 50Hz 16A e g 3x1 5 mm2 NZ1 Mains cable electric auxiliary heater e g 5x2 5 mm2 NZ2 Mains cable electric auxiliary heater optional e g 5x2 5 mm2 STL Control cable e g 2x1mm2 VEN Fan VHZ Inlet for...

Страница 55: ... Duo IM Indoor unit WKF 120 Duo GRL Common return pipe KA1 Condensate drain OU must be designed to be frost proof KA2 Condensate drain IU KML Refrigerant piping 3 8 and 5 8 NAM Power supply OU 230V 1 50Hz 20A e g 3x2 5 mm2 NIM Power supply IU 230V 1 50Hz 16A e g 3x1 5 mm2 NZH Power supply for auxiliary heater optional e g 5x2 5 mm2 STL Control line e g 2x1 mm2 VEN Fan VHZ Inlet for heating 55 ...

Страница 56: ... IM Indoor unit WKF 180 Duo GRL Common return pipe KA1 Condensate drain OU must be designed to be frost proof KA2 Condensate drain IU KML Refrigerant piping 3 8 and 5 8 NAM Power supply OU 400V 3 50Hz 3x16A e g 5x1 5 mm2 NIM Power supply IU 230V 1 50Hz 16A e g 3x1 5 mm2 NZH Power supply for auxiliary heater e g 5x2 5 mm2 STL Control line e g 2x1 mm2 VEN Fan VHZ Inlet for heating REMKO WKF WKF comp...

Страница 57: ...ndards n The electrical power cables must be fastened to the electrical terminals in the proper manner Otherwise there is a risk of fire n See that neither refrigerant or pipes that carry water pass through living or sleeping areas DANGER The installation of refrigerant equipment may be undertaken only by trained specialist per sonnel NOTICE Open refrigerant pipes must be protected against the int...

Страница 58: ... of installation and maintenance It is equally important that there is sufficient space above the device for installing the safety assembly Fig 62 Wall mounting WKF Indoor module WKF compact series n The indoor module must be installed on a firm level surface n The surface must possess sufficient load bearing capacity for the weight of the indoor module n The height adjustable feet can be used to ...

Страница 59: ...Minimum distances for the indoor modules A B 2 1 4 3 1 2 3 Fig 64 Minimum distances for the indoor modules A WKF B WKF compact Value in mm 1 2 3 4 WKF 500 300 300 150 WKF compact 500 300 300 59 ...

Страница 60: ... dampers Vibration dampers pre vent the transmission of vibrations through the floor or walls n A heated condensate tra ensures that conden sation from the pan can drain off Ensure that the condensate is prevented from freezing so that it can drain off gravel drainage The Water Ecology Act is to be observed n If there is insufficient space under the device for the refrigerant lines then the pre cu...

Страница 61: ...ousing n The external danger area on site can differ as a result of the setup The specialist company performing the installation work bears the responsibility for this n The internal danger area is located inside the machine and can only be reached with the use of an appropriate tool Access is prohibited for unauthorised persons Minimum distances in mm for the outdoor modules 1 2 3 4 5 6 250 1500 ...

Страница 62: ...e sides Condensate draining and ensured discharge 3 2 4 9 5 5 11 100 6 8 7 10 10 12 12 1 Fig 69 Condensate melt water drainage and transversely reinforced strip footing sectional drawing 1 Outdoor module 2 Leg 3 Condensation catch pan 4 Floor bracket 5 Transversely reinforced strip footing HxBxD 300x200x800 mm 6 Gravel layer for seepage 7 Condensate drainage heating 8 Drainage canal 9 Protection t...

Страница 63: ...it vapour density insulation n When operating the system at outdoor temper atures below 4 C care must be taken that the condensate line is frost protected The lower part of the housing and condensate pan are to be kept frost free in order to ensure permanent drainage of the condensate If necessary fit supplementary pipe heating n After completed installation check that the condensate drainage is u...

Страница 64: ... bleeder 3 Safety valve n The stop cocks supplied are to be positioned directly at the connections for the heat pump for the heater circuit inlet and return lines The shut off valves each contain a thermometer Fig 72 Shut off valves Turning the thermometer heads serves to close or open the stop valves The dial be brought into the desired position n Install the dirt traps delivered with the unit ou...

Страница 65: ...ks with a min HE surface area of 3 0m can be used The REMKO drinking water storage tank type EWS 300 is an enamelled drinking water storage tank with a HE surface area of 3 5m The additionally necessitated three way changeover valve is switched over by the Smart Control to provide HW In a bivalent alternative application the boiler can be connected directly to the indoor unit bivalent variant The ...

Страница 66: ... is integrated into the bottom housing The additionally necessitated three way changeover valve is switched over by the Smart Control to provide HW and is also part of the indoor unit In a bivalent alternative application the boiler can be connected directly to the indoor unit bivalent var iant In the bivalent variant the changeover valve required for this is also part of indoor unit The highly ef...

Страница 67: ...a time lag and assists the heat pump in parallel operating mode Manual operation II When manual mode is engaged the heating coil is engaged directly regardless of the parameters in the Smart Control This function can be used in the emergency heating mode or for the pre heating of non installed or operationally capable outdoor modules The temperature is then set using the thermostat on the housing ...

Страница 68: ...otor and valve body see separate Three way changeover valve operating instructions 8 Pull the motor away from the valve body 9 Turn the cylindrical ball valve in the direction of Outlet B using the round side floor heating side or heating element To switch to providing hot water proceed as fol lows 1 Turn the cylindrical ball valve in the direction of Outlet A using the round side domestic water s...

Страница 69: ... exposed pipes as well as those concealed under the plaster It is also recommended to install a 230 V dewpoint monitor with the associated pipe temperature sen sors to the feed pipes outside the heat pump The location should be selected so that it does not favour the temperature falling below the dewpoint The dewpoint monitor is wired so that it divides the connector in the feed line to the utilit...

Страница 70: ...e provides the allowed oxygen content in connection with the salt content Reference values for the hot water in accordance with VDI 2035 Part 2 low salt salline Electrical conductivity at 25 C μS cm 100 100 1500 Oxygen content mg l 0 1 0 02 pH value at 25 C 8 2 10 0 For aluminium and aluminium alloys the pH value range is limited the pH value at 25 C is 8 2 8 5 max 9 0 for aluminium alloys In low ...

Страница 71: ... that the flare has the correct shape and suit able union nuts Fig 77 to Fig 79 2 1 Fig 77 Deburring the refrigerant line 1 Refrigerant line 2 Deburrer 1 Fig 78 Flanging the refrigerant line 1 Flanging tool Fig 79 Correct flange shape Copper piping Out side diameterer Flare dimensions ø A 3 8 9 52 mm 12 4 12 8 mm 5 8 15 88 mm 21 9 22 3 mm Connection to the unit n Remove the cover panel from the ou...

Страница 72: ...ion pressure Once the connection has been made successfully the leak test is carried out with dry nitrogen The leak test involves spraying a leak detection spray onto the connections If bubbles are visible the connections have not been made properly In that case tighten the connection or if necessary create a new flange Pumping down to vacuum After completing a successful leak test the excess pres...

Страница 73: ...easured temperatures in the commissioning report Function test of heating operating mode 1 Remove the protective caps from the valves 2 Start the commissioning procedure by briefly opening the shut off valves on the outdoor component until the pressure gauge indi cates a pressure of approx 2 bar 3 Check all connections for leaks with leak detection spray and suitable leak detectors If no leaks are...

Страница 74: ...ch metres of pipe length basic length is required Basic pipe length Additional fill quantity WKF 85 WKF com pact 85 WKF 120 WKF com pact 120 WKF 120 Duo WKF 180 WKF com pact 180 WKF 180 Duo 10 m to max 50 m per circuit 0 g m 0 g m 10 m to max 75 m per circuit 50 g m 10 m to max 75 m per circuit 50 g m Beispiele Basic pipe length Additional fill quantity All series 10 m 0 g 15 m 250 g 20 m 500 g 25...

Страница 75: ...to operate and control the entire heating system The Smart Control is operated from the operating unit The operating unit is positioned on the basic device n The unit is pre installed at the factory After a reset of the Smart Control the default parame ters are loaded n An intensive visual inspection is to be carried out before the actual commissioning n Switch on the power supply n Then the prein...

Страница 76: ...nob are also used for navigation purposes By pressing the right softkey and turning the rotary knob you can select the menu items allowing you to go deeper into the menu structure Pressing the left softkey multiple times takes you back to the home screen 3D house icon Pressing the Info key 6 delivers information and support at any time on the area currently selected Pressing the Menu key 7 takes y...

Страница 77: ...ection must be made of the refrigerant circuit by a firm specializing in this field A heating system should always be serv iced annually Therefore we recommend arranging for a service contract that includes the seal inspection 13 Temporary shut down The system may not be switched off at the mains power supply even if the heating system is not used for heating purposes over an extended period e g h...

Страница 78: ...d Operational temperature limits too low or too high Observe temperature ranges Set point temperature exceeded Incor rect mode The set point temperature has to be higher than the heat source tempera ture check mode Disconnect the outdoor module then establish the correct clamp order using the connection plan Re establish voltage to the outdoor module Also make sure that the protective earth is con...

Страница 79: ...or unit E203 l l Z OM Communication error between main and inverter board E221 l Z m OM Error in outside temperature probe E231 l Z m OM Evaporator probe error E251 l Z m OM Hot gas temperature probe error E320 l Z m OM Overload switch probe error E403 l Z m OM Ice protection compressor in cooling mode only E404 l Z m OM Safety operation after compressor overload normal operation E407 l Z m OM Dis...

Страница 80: ...oard current consumption probe malfunction E469 l Z m OM Disturbance voltage probe inverter board E470 l Z m OM EEPROM malfunction read error E471 l Z m OM EEPROM version of the motherboard does not match the inverter E474 Z Z m OM IPM IGBT module malfunction E475 m m l OM BLDC fan 2 malfunction E484 l Z l OM PFC overload malfunction inverter board E485 l Z m OM Total power consumption malfunction...

Страница 81: ... a disable signal ID6010 Heat pump compressor start I O 2 Heat pump compressor start ID6012 Defrosting HP I O 2 Defrost heat pump ID6020 Pump internal after run time The internal pump runs at a reduced speed during the pump after run time ID6103 Heat demand HP Heat demand heat pump ID6104 Cooling demand HP Cooling demand heat pump ID6105 Defrost heat pump Defrost heat pump ID6107 Standby mode enab...

Страница 82: ...ID7205 Short circuit storage tank 1 top probe S08 Short circuit storage tank 1 top probe ID7206 Open contact external probe S10 Open contact external probe ID7207 Short circuit external probe S10 Short circuit external probe ID7208 Open contact refrigerant probe S07 Open contact refrigerant probe ID7209 Short circuit refrig erant probe S07 Short circuit refrigerant probe ID7210 Open contact circul...

Страница 83: ...ing the cause of the error the indoor and outdoor units must be restarted to reset the error ID7252 Heat pump malfunction code S20 Heat pump malfunction code ID7253 Heat pump 2 malfunction code S20 2 Heat pump 2 malfunction code ID7254 General inverter fault General inverter fault please contact an authorised service technician ID7255 EEPROM error EEPROM error Please contact an authorised service ...

Страница 84: ...al return temperature probe ID7284 Short circuit internal return temperature probe S15 Short circuit internal return temperature probe ID7285 Low suction gas temperature The compressor is disabled due to the suction gas tempera ture being too low ID7286 Coding error Rc A unique unit identifier could not be assigned using the coding resistor at the Rc terminal ID7287 Low evaporation tem perature Th...

Страница 85: ...e return flow temp S14 2 Open contact 4 mixed heating cycle return flow temp ID7305 Short circuit 4th mixed heating cycle to return flow temp S14 2 Short circuit 4 mixed heating cycle return flow temp ID7306 Open contact refrig erant probe I O 2 S07 2 Open contact refrigerant probe I O 2 ID7307 Short circuit refrig erant probe I O 2 S07 2 Short circuit refrigerant probe I O 2 ID7308 WKF fault code...

Страница 86: ...heat generator is active is implausible ID7334 Comm signal Communication between operating unit SMT 1 and power unit SMT 1 I O was interrupted Warnings ID Description Desig Details ID8102 Temperature discrep ancy in solar cycle The collector temperature is at least 60K higher than the storage tank temperature ID8103 Overnight collector temperature A collector temperature of at least 45 C 113 F occ...

Страница 87: ...ropped below the target flow rate ID8223 SD card error host SD card error host The SD card is either not inserted cor rectly or an error has occurred ID8224 SD card error SD card error CP The SD card is not inserted or an error has occurred ID8225 Dewpoint monitoring CP Dew point monitoring was activated but no control panel with integrated humidity and temperature probe was assigned to the coolin...

Страница 88: ...WKF compact 85 15 14 6 13 16 5 1 2 18 7 4 10 11 12 E 3 9 19 17 8 20 Fig 84 Exploded view outdoor modules WKF WKF compact 85 We reserve the right to modify the dimensions and constructional design as part of the ongoing technicalde velopment process REMKO WKF WKF compact 88 ...

Страница 89: ...1120317 1120317 1120562 9 Fan protection guard 1120318 1120318 1120563 10 Side panel right 1120319 1120319 1120564 11 Side panel right 1120320 1120320 1120565 12 Grille rear 1120321 1120321 1120566 13 Fan motor 1120322 1120322 1120322 14 Evaporator sensor compressor set sensor 1120323 1120323 1120323 15 Hot gas sensor outdoor temperature set sensor 1120324 1120324 1120324 16 Transformer 1120325 11...

Страница 90: ... 1 2 3 4 5 6 7 8 9 10 11 12 13 15 14 16 17 18 19 Fig 85 Exploded view outdoor modules WKF WKF compact 120 We reserve the right to modify the dimensions and constructional design as part of the ongoing technicalde velopment process REMKO WKF WKF compact 90 ...

Страница 91: ...20338 1120577 9 Side panel right front 1120457 1120457 1120578 10 Mounting corner right front 1120478 1120478 1120579 11 Side panel right rear 1120458 1120458 1120580 12 Grid rear 1120459 1120459 1120581 13 Mounting corner right rear 1120481 1120481 1120582 14 Fan motor 1120482 1120482 1120482 15 Evaporator sensor compressor set sensor 1120460 1120460 1120460 15 Hot gas sensor outdoor temperature ...

Страница 92: ...18 16 20 19 3 11 4 17 1 13 15 9 10 8 7 5 14 2 6 12 Fig 86 Exploded view outdoor modules WKF WKF compact 180 We reserve the right to modify the dimensions and constructional design as part of the ongoing technicalde velopment process REMKO WKF WKF compact 92 ...

Страница 93: ... guard 1120338 1120338 1120569 9 Side panel right front 1120477 1120477 1120570 10 Mounting corner right front 1120478 1120478 1120571 11 Side panel right rear 1120479 1120479 1120572 12 Grid rear 1120480 1120480 1120573 13 Mounting corner right rear 1120481 1120481 1120574 14 Fan motor 1120482 1120482 1120482 15 Evaporator sensor compressor set sensor 1120483 1120483 1120483 15 Hot gas sensor out...

Страница 94: ...e WKF 120 Duo 1 2 3 4 5 6 7 8 9 10 11 12 13 15 14 16 17 18 19 Fig 87 Exploded view outdoor unit WKF 120 Duo We reserve the right to modify the dimens and design as part of the ongoing techn development process REMKO WKF WKF compact 94 ...

Страница 95: ...l front right 1120457 1120578 10 Mounting corner front right 1120478 1120579 11 Side panel right rear 1120458 1120580 12 Grid back 1120459 1120581 13 Mounting corner back right 1120481 1120582 14 Fan motor 1120482 1120482 15 Evaporator probe Compressor set probe 1120460 1120460 15 Hot gas probe Outside temperature set probe 1120461 1120461 16 Electronic expansion valve 1120463 1120463 17 Motherboa...

Страница 96: ...KF 180 Duo 18 16 20 19 3 11 4 17 1 13 15 9 10 8 7 5 14 2 6 12 Fig 88 Exploded view outdoor unit WKF 180 Duo We reserve the right to modify the dimens and design as part of the ongoing techn development process REMKO WKF WKF compact 96 ...

Страница 97: ... Side panel front right 1120477 1120570 10 Mounting corner front right 1120478 1120571 11 Side panel right rear 1120479 1120572 12 Grid back 1120480 1120573 13 Mounting corner back right 1120481 1120574 14 Fan motor 1120482 1120482 15 Evaporator probe Compressor set probe 1120483 1120483 15 Hot gas probe Outside temperature set probe 1120484 1120484 16 Transformer 1120485 1120485 17 Electronic exp...

Страница 98: ... 7 13 22 10 12 11 9 8 23 14 18 15 16 6 3 4 19 17 2a 2b Fig 89 Exploded view indoor module WKF 85 120 180 We reserve the right to modify the dimensions and constructional design as part of the ongoing technical development process REMKO WKF WKF compact 98 ...

Страница 99: ...mbly 1120010 1120010 1120010 8 Actuator bypass valve 1120913 1120913 1120913 9 Valve body bypass valve 1120913 1 1120913 1 1120913 1 10 Auxillary heater 9 kW 400V 3 50 Hz 260066 260066 260066 11 Actuator 3 way valve 1120912 3 1120912 3 1120912 3 12 Valve body 3 way valve 1120912 2 1120912 2 1120912 2 13 Ultrasonic flow rate meter 1120914 1120914 1120914 14 Primary pump indoor module 1120911 112130...

Страница 100: ...21055 Cable set Comkit 1120306 1120309 1120309 SD card act software without Smart Web Smart Count 1120985 1120985 1120985 Coding resistor 130 110 Ohm 1120926 1121052 1121053 Pt1000 1 5m long S15 1120930 1120930 1120930 Transformer for Comkit board 1120935 1120935 1120935 Assembly auxiliary heater 9 kW including flow rate meter 1120942 1120942 1120942 When replacing the SD card always replace both ...

Страница 101: ... 2c 25 2a 2b 7 1 9 12 15 23 14 10 11 13 16 18 17 20 3 4 21 22 5 6 24 8 Fig 90 Exploded view indoor modules WKF compact 85 120 180 We reserve the right to modify the dimensions and constructional design as part of the ongoing technical development process 101 ...

Страница 102: ... 9 Safety assembly 1120010 1120010 1120010 10 Actuator bypass valve 1120913 1120913 1120913 11 Valve body bypass valve 1120913 1 1120913 1 1120913 1 12 Auxillary heater 9 kW 400V 3 50 Hz 260066 260066 260066 13 Actuator 3 way valve 1120912 3 1120912 3 1120912 3 14 Valve body 3 way valve 1120912 2 1120912 2 1120912 2 15 Ultrasonic flow rate meter 1120914 1120914 1120914 16 Primary pump indoor modul...

Страница 103: ... Cable set Comkit 1120306 1120309 1120309 Protection anode chain anode 1120121 1120121 1120121 SD card act software without Smart Web Smart Count 1120985 1120985 1120985 Coding resistor 130 110 Ohm 1120926 1121052 1121053 Pt1000 1 5m long S15 1120930 1120930 1120930 Transformer for Comkit board 1120935 1120935 1120935 Assembly auxiliary heater 9 kW including flow rate meter 1120942 1120942 1120942...

Страница 104: ...mm 259050 1 Corrugated tube 2 WT connection on bottom WP RL 1340mm 259050 2 Corrugated tube 3 WW connection on top 1250mm 259050 3 Corrugated tube 4 circ connection on middle 1600mm 259050 4 Corrugated tube 5 KW connection on bottom 2400mm 259050 5 Flat gasket outside 39mm x inside 27mm x thickness 2mm 259050 6 Flat gasket outside 30mm x inside 21mm x thickness 2mm 259050 7 When ordering spare par...

Страница 105: ...Duo 1 5 7 13 22 10 23 6a 4 17 2 4 19 19 6b 8 9 14 14 13 17 18 3 3 6 Fig 91 Exploded view indoor modules WKF 120 180 Duo We reserve the right to modify the dimensions and constructional design as part of the ongoing technical development process 105 ...

Страница 106: ...912 2 1120912 2 10 Auxiliary heater 9 kW 260066 260066 13 Ultrasonic flow rate meter 1120914 1120914 14 Primary pump indoor module 1121304 1121304 17 Terminal strips 1120922 1120922 18 Pipe assembly support block 1120904 1120904 19 Com Kit control board 1120999 1120999 22 Ball valve for filling drainage 1120905 1120905 23 Bleeder 1 4 1120059 1120059 Spare parts not illustrated Complete wiring harn...

Страница 107: ...pplying heat either regularly or as requirements dictate Air water heat pumps with circuit reversal are distin guished by their requirements based quick and energy efficient defrosting system Energy supply company switching Certain energy supply companies offer special tar iffs for the operation of heat pumps When switching off the power supply compa nies only on the barrier is in contact only req...

Страница 108: ...eplete the ozone layer EC 2037 2000 and the Regulation on Cer tain Fluorinated Greenhouse Gases EC 842 2006 In addition a minimum of one annual service and inspection must be carried out as well as a sealing test for refrigerating plants with a refrigerant filling weight over 3 kg Seasonal performance factor The seasonal performance factor relates to the ratio of heat content delivered by the heat...

Страница 109: ... Intended use 6 L Leak testing 72 M Minimum distances for the outdoor modules 61 Mounting Indoor module 58 O Ordering spare parts 95 97 Overall sound pressure levels 25 26 27 28 29 P Passive cooling 50 Pipe outlets on indoor unit spacing 21 Pipe sockets on indoor unit arrangement 21 Pipe outlet spacing 18 20 Pipe socket arrangement 18 20 Propellant in accordance with Kyoto Protocol 15 Pumping down...

Страница 110: ...REMKO WKF WKF compact 110 ...

Страница 111: ......

Страница 112: ...ct as advisers to our customers in air conditioning and heating technology SFlbCustomer Service Our equipment operates precisely and reliably However in the event of a fault REMKO customer service is quickly at the scene Our comprehensive network of experienced dealers always guarantees quick and reliable service REMKO INTERNATIONAL and also right in your neighbourhood Make use of our experience a...

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