Powers Controls
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1. FLATHEAD 2 BINDING HEAD SCREWS SCREWS Table 2 Panel Mounting Kit Number 151 146 PANEL OR See Figure 3 9 yess Grem Deserinon Jow marar 3 48 x 1 87 ADJUSTMENT KNOB H SCREW _ I Y WG Fy CER i Ly No 6 32 x 5 16 Flat Head Screw Moa ic ew 6 No 3 48 x 1 8 Bind Head Screw 2 Brass Cad PI H H 38 Dial Faceplate Polystyrene SWITCH BODY 9 No 6 32 x 1 2 Flat Head Screw SWOOPIRI DIAL PLATE 2 6 32 x 57167 2 HEX NUTS FLATHEAD 2 LOCK WASHERS SCREWS DIAL 8 FACE PLATE NOMENCLATURE PLATE Figure 3 Panel Mounting See Table 2 1 Remove switch from box being careful not to turn adjusting screw The switch is shipped factory set to be closed that is to pass no air Remove knob from adjusting screw shaft 2 Screw stop screw 1 to mounting plate 7 Stop screw hole is closest to adjusting screw Make certain small stop screw washer 2 is in correct position Fasten plate 7 to switch with two regular flat head screws 5 Make sure stop screw 1 fits into recess of switch body 3 Connect 1 4 inch OD plastic tubing to fittings on switch body Note R and S port markings Connect other ends of connecting tubes to supply and return lines through hole in panel 4 With stop screw 1 below adjusting screw shaft attach mounting plate 7 to panel with two flat head screws 9 5 P2. and models as design improvements are introduced Powers is a registered trademark of Siemens Industry Inc Product or company names mentioned herein may be the trademarks of their respective owners 2005 Siemens Industry Inc Siemens Industry Inc Building Technologies Division 1000 Deerfield Parkway Your feedback is important to us If you have comments about this document please send them to sbt_technical editor us sbt siemens com Document No 155 055P25 Printed in the USA Page 9 Buffalo Grove IL 60089 1 847 215 1000
3. control a complete heating system Positioning switches are also used in numerous special applications An adjusting knob varies positioning switch control pressure Turning the adjusting knob approximately 300 will gradually change the control pressure from 0 to 15 psi maximum supply pressure When the knob indicator is pointed up the switch passes approximately 7 1 2 psi when using 15 psi supply Assume a control pressure of 10 psi is needed from positioning switch By turning the adjusting knob clockwise increased spring pressure on the exhaust valve body seats the exhaust valve ball Further rotation of the knob forces the push pin to unseat the supply valve ball As air accumulates in the exhaust valve chamber it exerts pressure on the diaphragm in opposition to that of the adjusting spring The knob is turned until the branch pressure reads 10 Ibs At this position there is sufficient pressure in the exhaust valve chamber to seat the supply valve ball Airflow then stops If control pressure drops the supply valve again opens to maintain constant pressure When the adjusting knob is turned counterclockwise the adjusting spring pressure is reduced While the supply valve remains closed the exhaust valve opens until the control air pressure reaches its new setting EXHAUST ADJUSTING ibe PORT EXHAUST VALVE BALL PUSH PIN ADJUSTING X SPRING AIR EXHAUST VALVE BODY BODY DIAPHRAGM SW0038R1 Figure 1 Standard T
4. SIEMENS Technical Instructions Document No 155 055P25 SW 151 1 April 1 2005 Powers Controls SW 151 Positioning Switch Description The SW 151 Positioning Switch standard type is used to deliver any manually selected pressure over a range of 15 psi It has a wide variety of applications in pneumatic control systems The adjustment knob can be turned approximately 300 degrees The bleed type switch changes the outlet pressure 3 psi for 300 degree knob rotation The primary use is for manual reset of the RC 195 Receiver Controller Several mounting arrangements can be used Switches may be mounted on control panels with descriptive name plates surface mounted on a wall or duct or placed directly on control center panels by omitting the dial faceplate When the dial faceplate is omitted an inscription covering switch function is made directly on the panel itself The switch has a small body diameter which permits close center to center mounting It can be used with panels up to 3 8 inch thick Three standard dial plates are available A blank plate is also available which can be printed to order A nomenclature plate is provided with space for indicating switch operation The positioning switch has solid brass body parts for maximum resistance against corrosion In addition a transparent face cover protects both the dial and nomenclature plates Product Numbers Table 1 DialPlates e Plates Nomenclature Plates Prod
5. ance hole for stop screw 1 head Tighten clamping nut 5 after positioning stop screw so it is directly beneath adjusting screw shaft Tighten knob to shaft Turn knob fully counterclockwise Switch should pass 0 psi with 15 psi air supply When switches are grouped together provide a minimum center to center distance as shown in Figure 4 The installation is now complete PANEL CUTOUT SWO044R1 15 16 DIA 24 DRILL HOLE USING og0 55 DRILL USE PLATE AS TEMPLATE 5 CLAMPING 1 3716 DIA NUT 30 q 4 S Qo 4 irae TNA 3 MAX DIMENSIONS IN INCHES tTHICKNESS MILLIMETERS IN PARENTHESES 3 8 9 5 Figure 6 Graph O Matic Panel Mounting See Table 4 Table 4 Graphic Panel Mounting Kit No 151 148 See Figure 6 1 No 2557 16 Fat Head Screw 2 Washer 2 Washer 3 Round Mounting Plate _ 4 No 6 32 x 5 16 Fat Head Screw 2 5 Clamping Nut ha Ee s ieomeseem a Page 7 Technical Instructions Document Number 155 055P25 April 1 2005 Dimensions SW 151 Positioning Switch FACE PLATE T r l l ane 47 4 4 2 114 57 l 1 1 8 29 tiers Ee one 14 i a sd od fc a sl OOE S a i E fu 1 7 8 DIA l cas S 6 32 THD 3 PANEL CUTOUT DIMENSIONS IN INCHES MILLIMETERS IN PARENTHESES For panels more than 0 106 inches 2 7 mm thick For thin
6. lace desired dial and nomenclature plates in recesses in the dial faceplate 8 Then affix to mounting plate 7 with two binding head screws 6 6 Tighten knob to shaft Turn knob fully counterclockwise Switch should pass 0 psi with 15 psi air supply The installation is now complete Page 4 Siemens Industry Inc SW 151 Positioning Switch Technical Instructions Document Number 155 055P25 April 1 2005 Panel Mounting Figure 4 shows the minimum distances from center to center of switches in order to Continued mount the maximum number of switches on a panel 2e n gt H 62 i SwoO042R2 3 7716 87 MINIMUM CENTER TO CENTER DIMENSIONS SHOWN DIMENSIONS IN INCHES MILLIMETERS IN PARENTHESES Figure 4 Panel Spacing Siemens Industry Inc Page 5 Technical Instructions SW 151 Positioning Switch Document Number 155 055P25 April 1 2005 Surface Mounting Page 6 1 Remove knob from switch 2 Screw mounting bracket 10 to surface 3 Screw stop screw 1 to mounting plate 7 Stop screw hole is closest to adjusting screw Make certain small washer 2 is in place Fasten plate 7 to switch body using two short flat head screws 5 Stop screw head fits recess in switch body 4 With stop screw below adjusting screw shaft screw mounting plate 7 to mounting bracket 10 using the two 100 flat head screws 9 hex nuts 3 and lock washe
7. ner panels drill 0 210 inch 5 3 mm hole No 4 drill bit and use two hex nuts 3 to secure the mounting plate 7 to panel Figure 7 Panel Mounting Dimensions j 3 4 1 3 8 35 swoo40R1 2 14 57 DIMENSIONS IN INCHES MILLIMETERS IN PARENTHESES Figure 8 Switch Dimensions Page 8 Siemens Industry Inc SW 151 Positioning Switch Construction Y N AA SSL das SS 1 ie ppu SSE ma D H H N H ESES H H Len SswWOO04S5R1 IES Z rai NY LEE N Technical Instructions Document Number 155 055P25 April 1 2005 ODODO 7 Figure 9 Construction Table 5 Product Numbers 151 142 and 151 143 em Paro Description ow materai ce pormi o e dusting Srew 1 ad Pi La forno Trust Flange 1 Brass _ rs fering Housing 1 Brass _ Ps iapiragmnt 1 Brass _ 7 Piapivagm Ring 1 Brass Pe iapiragm Plate 2 Brass _ Pe Pushin i Si Soo Fc bo i es m bo wr e forno Adustng Sorew 1 Brass _ Par no Descripion ty Mater P_fSwicnowy i Bres C pavas i Sin Sa fevhaust vate Boay 1 Brass piep Neoprene pie 632 3 Screw 6 Brass spring Sansa 1 uso wire sorne lees 1 musie wire pT ie 8820 Set Screw 1 Seo serge Si Stal Information in this publication is based on current specifications The company reserves the right to make changes in specifications
8. rs 4 5 Place dial and nomenclature plates in recess of dial faceplate 8 6 Tighten knob to shaft Turn knob fully counterclockwise Switch should pass 0 psi with 15 psi air supply The installation is now complete ase 4 112 114 g swooa3R1 4 718 124 00 DIMENSIONS IN INCHES MILLIMETERS IN PARENTHESES Figure 5 Surface Mounting See Table 3 Table 3 Surface Mounting Kit No 151 147 See Figure 5 item Description Oty materiai No 3 48 x 1 8 Bind Head Screw 2 Brass Cad PI e Dial Facepiate 1 Poiysiyrene e No 632x 172 Fiat Head Screw 2 Brass Siemens Industry Inc SW 151 Positioning Switch Graph O Matic Panel Mounting Siemens Industry Inc 1 Technical Instructions Document Number 155 055P25 April 1 2005 Remove switch from box being careful not to turn adjusting screw The switch is factory set to be closed that is to pass no air Remove knob from adjusting screw shaft Drill hole in panel using a No 55 drill Secure mounting plate 3 to panel with drive screw 6 Screw stop screw 1 into round mounting plate 3 Make certain small stop screw washer 2 is in correct position See Figure 3 Noting R and S port markings connect 1 4 inch OD plastic tubing to switch Join other ends of connecting tubing to supply and return line Push switch through hole and screw mounting plate 3 to switch body Note clear
9. uct eree Part tonne Ks Part Description Part Description Number Number Number Number 151 142 Standard Switch 151 146 Panel Mounting 151 097 151 098 Table 2 151 118 151 151 Humidity 151 143 Bleed Switch 151 147 Surface Table 3 151 148 ates alle NOTE For a complete installation order a switch Lal kit dial plate and nomenclature plate Reversible plate Clockwise on one side counterclockwise on other side See Field Purchasing Guide for print to order information Siemens Building Technologies Inc Technical Instructions SW 151 Positioning Switch Document Number 155 055P25 April 1 2005 Specifications Operating Physical Application Operation Standard Type See Figure 1 Page 2 Output Standard 0 to 15 psi 0 to 103 kPa for 300 knob rotation Bleed 7 1 2 to 10 1 2 psi 52 to 72 kPa for 300 knob rotation Capacity 625 SCIM 171 ml s Medium Air Ambient Temperature Maximum 160 F 71 C Minimum 20 F 29 C Maximum Air Pressure 30 psig 207 kPa Air Consumption 151 143 35 SCIM 9 5 ml s 151 142 None Dimensions See Figures 7 and 8 Shipping Weight 2 Ib 0 9 kg Air Connections 1 4 inch OD plastic tubing Color knob and dial plate Gray Body tapping is 1 16 NPT Positioning switches have many applications in pneumatic systems They may be used to control air operated equipment directly such as damper motors or valves or they may be used to manually
10. ype Siemens Industry Inc SW 151 Positioning Switch Bleed Type See Figure 2 Installation Flush Mounting on Wall Siemens Industry Inc Technical Instructions Document Number 155 055P25 April 1 2005 An adjusting knob varies positioning switch control pressure Turning the adjusting knob approximately 300 will gradually change the control pressure from 7 1 2 to 10 1 2 psi max supply pressure When the knob indicator is pointing up the switch passes approximately 9 psi when using a restricted supply Assume a control pressure of 10 psi is needed from positioning switch By turning the adjusting knob clockwise increased pressure on the exhaust valve body seats the exhaust valve ball As air accumulates in the exhaust valve chamber it exerts pressure on the diaphragm in opposition to that of the adjusting spring Any excess pressure above 10 psi would bleed off through the exhaust valve and the air pressure would remain constant at 10 psi NOTE EXHAUST ADJUSTING naa PORT EXHAUST es N ADJUSTING VAVE BALL os n r AIR CONNECTION EXHAUST VALVE BODY SW0039R1 BODY DIAPHRAGM Figure 2 Bleed Type See Document No 155 252P25 TB 238 for recommendations for mounting these switches in electrical wall boxes or on walls with masonry or drywall construction Page 3 Technical Instructions SW 151 Positioning Switch Document Number 155 055P25 April 1 2005 Panel Mounting 2 100
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