Buderus 21 Design Manual Download Page 1

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For Buderus Panel Radiator models:

- Model 21

- Model 22

- Towel Warmers

Design Manual

Panel Radiators

Summary of Contents for 21

Page 1: ...For Buderus Panel Radiator models Model 21 Model 22 Towel Warmers Design Manual Panel Radiators ...

Page 2: ...2 Panel Radiator Design Manual Panel Radiator Design Manual 12 2009 Technical specifications are subject to change without prior notice ...

Page 3: ...09 Technical specifications are subject to change without prior notice Table of Contents 1 General Info 5 2 Safety 6 3 Product Description 7 4 Mounting Guidelines 15 5 Radiator Output Ratings 17 6 Radiator Selection Procedure 21 7 Piping Arrangements 22 8 Buderus NB Style Towel Racks 32 ...

Page 4: ...4 Panel Radiator Design Manual Panel Radiator Design Manual 12 2009 Technical specifications are subject to change without prior notice ...

Page 5: ...acities are listed by model height and length and are based on different supply water temperatures For added savings Buderus recommends running panel radiator systems at reduced temperatures When using a condensing boiler the system should be designed so that the return water temperature makes the boiler condense except on the coldest days of the year Dew point flue gases Natural Gas 130 F 55 C 2 ...

Page 6: ...ous injuries and damage to property Additional symbols for identification of dangers and user instructions USER NOTE User tips for optimal use of equipment and adjustment as well as other useful information 2 2 Please follow these instructions Only use original Buderus spare parts Damage caused by the use of parts not supplied by Buderus is excluded from the Buderus warranty 2 3 Tools materials an...

Page 7: ...n where design flexibility is important The radiator s unique wall mounted and optional floor mounted styling also minimizes areas where dust and dirt can collect and allows for greater flexibility in furniture placement Panel radiators from Buderus are stocked in several heights and lengths and in two widths Special order sizes up to 3 high and 10 long are available with a 4 to 6 week lead time B...

Page 8: ...derus are the perfect combination of contemporary styling and economical luxury Towel warmers are also an excellent way to add heat and remove humidity and dampness from any bathroom Available in three sizes the NB style towel warmers are finished in a high quality white enamel for use in damp environments like bathrooms They should not be installed in showers or areas where they are exposed to di...

Page 9: ...he bottom on one side The radiator can be mounted with these connections facing left or right Figure 9 shows supply and return connections which cannot be reversed Buderus supplies the following compression fittings for most applications Compression fittings are available from Buderus in sets of two see Table 3 These fittings are normally secured to the piping connection on the radiator When diver...

Page 10: ...iators and towel racks Part no 82911060 Drain Valve w hose bib for panel radiators Part no 013G81013 Single Valve angled with adjustment facing down for towel racks Head can be replaced with thermostatic head 013G8250 or Part no 3L0143 Angled Return Elbow with isolation valve for towel racks Part no 013G5002 Manual Adjuster for panel padiators and towel racks Part no 013G8250 Danfoss Thermostatic ...

Page 11: ...gle Valve straight with adjustment at front for towel racks Head can be replaced with thermostatic head 013G8250 or 82721124 Part no 013G8014 Single Valve angled with adjustment at the front for towel racks Head can be replaced with thermostatic head 013G8250 or 82721124 Part no 82721124 Buderus Thermostatic Head for panel radiators and towel racks Part no 82721180 Buderus Thermostatic Head w remo...

Page 12: ...control and flow balancing Flow Balancing Flow balancing is done by adjustment of the ring marked 1 7 and N on the flow setter valve lining the desired setting up with the dimple in the first ring Turning of the ring adjusts the diameter available for water flow The N marking indicates a fully open setting the 1 marking indicates nearly full restriction The diagram on page 13 shows the pressure dr...

Page 13: ...tion Then open the bypass spindle the desired number of turns from the fully closed position Refer to the chart that is on page 30 explaining the pressure drop for a one pipe system with diverter valves You will need to add up the pressure drop of radiator and diverter valve when sizing the circulator Factory setting Radiator percentage of flow Number of turns Straight Valve 50 45 40 35 30 1 2 3 R...

Page 14: ...f panel radiators and towel racks and through its capillary expansion controls the flow rate and therefore the heat output of the panel When using the thermostatic head the flow setter valve needs to be in the N position A moveable spring loaded seat assembly inside the flow setter valve regulates the water flow through thermostatic action of the control head This thermostatic head is required for...

Page 15: ...f the radiator rests 5 8 above the bottom edge of the bracket The radiator wall clearance can be set at 1 9 16 or 2 1 16 depending on the orientation of the plastic locating clips Piping connections are located at 1 3 16 return and 3 3 16 supply in from the valve side of the radiator The piping wall offset is 3 9 16 or 4 1 16 for both Model 21 and 22 radiators For left hand radiators measure these...

Page 16: ...et Supply Return Bracket Minimum of 4 2 1 or 2 1 2 Minimum of 4 Finished wall TOP VIEW Stud Fig 8 Model 21 Panel Radiator Rough in Dimensions in inches for wall mounting Panel Radiator 3 from finished wall to center of tapings 2 1 16 Bracket Supply Return Bracket 4 Minimum of 4 1 2 TOP VIEW Finished wall Minimum of 4 1 or 2 Stud Fig 9 Model 22 Panel Radiator Rough in Dimensions in inches for wall ...

Page 17: ...he flue gas dew point of 131 F 55 C for significant periods of the heating season 2 Radiator outputs in BTU Hr Model 21 2 63 5mm deep Table 7 Output BTU hr Supply 194 F 90 C 176 F 80 C 158 F 70 C 140 F 60 C Part Number Delta T 36 F 20 C 36 F 20 C 18 F 10 C 18 F 10 C 12 x24 x2 1900 1500 1300 1000 3 41224 12 x36 x2 2900 2300 2000 1400 3 41236 12 x48 x2 3800 3000 2600 1900 3 41248 12 x59 x2 4700 3700...

Page 18: ...400 3 21248 12 x63 x4 6500 5100 4500 3300 3 21263 12 x71 x4 7300 5800 5100 3700 3 21271 20 x16 x4 2500 2000 1700 1200 3 22016 20 x24 x4 3700 2900 2600 1900 3 22024 20 x36 x4 5600 4400 3900 2800 3 22036 20 x48 x4 7500 5900 5200 3700 3 22048 20 x59 x4 9300 7300 6400 4600 3 22059 20 x71 x4 11200 8800 7800 5600 3 22071 24 x16 x4 2900 2300 2000 1400 3 22416 24 x24 x4 4300 3400 3000 2200 3 22424 24 x36 ...

Page 19: ...r output To find the proper size radiator we must compute the listed output at 68 F 20 C Adjusted Output 8 750 Btu hr at 194 F 90 C and 55 F 13 C T room Compute correction factor α as α 1 385 194 75 0 0116 Listed Output 8 750 1 0 0116 x 68 55 7 560 Btu hr From Table 8 Use Model 22 20 x 48 x 4 instead of Model 22 24 x 48 x 4 listed output 7 500 Btu hr This ambient room temperature effect is general...

Page 20: ... for in the conversion factors listed in Table 9 Figure 10 contains the performance curves for Model 22 radiators showing the output per linear foot of radiation for the different heights as a function of supply temperature Different curves are shown based on a 18 F 10 C and 36 F 20 C temperature drop through the radiator and a 68 F 20 C room temperature Example A room requires 12 000 Btu hr with ...

Page 21: ...ay only be needed based on the heat loss Window size and number of windows as well as overall room size affect the selection process Once a room exceeds 12 x 12 it is advisable to install 2 smaller radiators on outside walls for more comfort 3 The selected piping arrangement affects the radiator sizing on monoflow or one pipe diverter valve based systems because the supply temperature reduces with...

Page 22: ...mum Btu load on a one pipe system based on pipe size and overall temperature drop Series loop system All water flows through all radiators A thermostatic head cannot be used on any radiator as it will shut off all flow A central thermostat is required for temperature control Do not exceed heat loads as listed in Table 10 Option 1 one pipe system with monoflow tees Fig 11 Monoflow tees are used to ...

Page 23: ...lent for 4 to 6 loops Size the main piping for the combined flow in all branches Drawing not to scale 1 2 1 2 1 2 1 2 1 2 1 2 1 2 1 2 1 2 Option 1 One Pipe System with Venturi Tees or Monoflow Tees Option 2 One Pipe System with Diverter Valves Option 3 Multiple One Pipe System Home Run Fig 11 One Pipe System Options following the guidelines in Table 10 Refer to the Pressure Drop Curves Fig 14 15 o...

Page 24: ...t load of the previous room and the total loop flow rate GPM as New Supply Temp Previous Supply Temp Q room 500 GPM With the supply temperature computed in Step 8 and the linear heat load in Step 4 refer to Figure 10 to find the required radiator size or tables 9 and 10 for the total individual radiator output if the any of the four examples applies Use the same T value in reading from the curves ...

Page 25: ...h value computed in steps 4 and 8 locate those values in Fig 10 The output curve located directly above that point identifies the minimum size radiator required Use the 18 F 10 C T curves if designing for a 20 to 30 F 11 to 17 C temperature drop use the 36 F 20 C T curves if designing for a 40 F 22 C drop Results Output ft Radiator Models Bedroom Supply Temp 180 F 82 C 1500 Btu ft 22 20 M Bedroom ...

Page 26: ... runs Use 1 2 copper or PEX tubing to connect radiators to main runs 3 Individual radiator control is easily done using thermostatic sensor heads Use constant circulation with outdoor reset control for optimum system performance A central thermostat can be used for on off control however thermostat location governs overall system control and may override individual room control Requirements for Tw...

Page 27: ... radiator to ensure proper flow through each radiator Adjust flow setter valves as needed based on system performance Close down the flow setter on hot radiators by dialing in a lower setting on the adjustment ring or adjust the flow setter to a higher setting for cool radiators 6 Size piping based on system flow rate size circulator based on flow rate and overall system pressure drop Table 14 1 S...

Page 28: ...output and desired style Select radiators from Tables 9 10 since the system temperature is similar to those listed If the radiators must be sized for the available window space determine the minimum needed model radiator based on the required Btu ft for each room from Figure 10 with a 194 F 90 C supply temperature Use the same supply temperature for each radiator in a two pipe system 2 Select an o...

Page 29: ... remaining radiators 6 Use guidelines in Table 10 to size main piping In this case use 3 4 copper mains with 1 2 copper or PEX to from each radiator Install a thermostat in master bedroom Size circulator based on total flow rate and install balancing valve for flow control Piping Lay out Suggestions 1 For small systems use one pipe system with monoflow tees or diverter valves Btu s per loop 15 000...

Page 30: ...ressure drop curves Settings on flowsetter 1 2 3 4 5 6 7 N 200 100 90 80 70 60 50 40 30 20 10 9 8 7 6 5 4 Pressure Drop in Inches H 0 0 05 0 08 0 1 0 2 0 3 0 4 0 5 0 6 0 7 0 9 1 2 3 GPM BTU Hr BTU Hr 500 1 000 2 000 5 000 10 000 BTU Hr 750 1 500 3 000 7 500 15 000 1 000 2 000 4 000 10 000 20 000 T 40 F 20 C T 20 F 10 C T 30 F 15 C Fig 13 ...

Page 31: ...diator Design Manual Panel Radiator Design Manual 12 2009 Technical specifications are subject to change without prior notice Radiator Flow 30 3 2 1 p Head in Feet 0 50 0 75 1 0 1 5 2 0 2 5 3 0 4 0 Circuit Flow GPM 40 50 45 35 Fig 14 ...

Page 32: ...has an adjustable offset of 3 and 4 from the wall All towel racks come in a multi layered powder coat enamel white finish that is durable easy to clean and ideal for most existing color schemes Supply and return pipes are reversible Openings in the towel rack are provided to hang towels Complete wall mounting hardware and a manual air vent is supplied with each towel rack For piping accessories av...

Page 33: ...24 Bleeder installed Recommended Bracket locations 16 Recommended Bracket location Top view Taping Taping 21 center to center Recommended minimum floor clearance 6 Recommended bracket spacing 32 Towel Rack 25 47 Towel Rack 41 72 Towel Rack 65 Adjustable from 3 to 4 Finished Wall 2 Fig 15 Buderus NB Style Towel Warmers Supply and Return tapings are interchangeable ...

Page 34: ...34 Panel Radiator Design Manual Panel Radiator Design Manual 12 2009 Technical specifications are subject to change without prior notice ...

Page 35: ...Applications manual 35 Panel Radiator Design Manual Panel Radiator Design Manual 12 2009 Technical specifications are subject to change without prior notice ...

Page 36: ... 603 584 1681 www buderus net Products manufactured by Bosch Thermotechnik GmbH Sophienstrasse 30 32 D 35576 Wetzlar www buderus de Bosch Thermotechnology Corporation reserves the right to make changes without notice due to continuing engineering and technological advances BTC 451001101 A 12 2009 ...

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