Powers Controls
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1. Continued SPRING ADJUSTMENT SCREW See Figure 3 RLOO67R1 ADJUSTING SPRING ny GAS WP N N 2 SUPPLY EXHAUST VALVE ASSEMBLY Figure 3 Relay Operation Signal Inverting Connect the input signal to both M and S1 ports and connect the output signal to the B port Port S2 is not used With the spring set for 15 psi 103 kPa the exhaust port is closed and the supply port is open to the B chamber until S1 pressure plus B pressure equals 15 psi 103 kPa As S1 increases the exhaust port opens causing B to decrease to maintain the S1 B 15 psi 103 kPa relationship A small leak port between M and B chambers assures fast response and prevents the device from locking up on a loss of supply air pressure Mounting and e Do not locate the device in areas with excessive vibration or corrosive atmosphere Installation e This device may be branch mounted or surface mounted Mount the relay vertically or horizontally e Install the relay so the port markings are visible and the spring adjustment screw is accessible Surface Mounting 1 Attach the provided bracket to the mounting surface with two 8 or 10 sheet metal screws not provided 2 Attach the relay to the bracket with the two 6 32 screws provided The bracket has tapped holes for this purpose Page 4 Siemens Industry Inc RL 243 Reverse Acting Relay Mounting and Installation Continued Adjustment Revers2. SIEMENS Technical Instructions Document No 155 124P25 RL 243 17 April 1 2005 Powers Controls RL 243 Reverse Acting Relay Description Features Product Number Specifications RLOO61R1 The RL 243 Reverse Acting Pneumatic Relay provides a proportional output signal that varies inversely with the input signal A spring adjustment is provided to allow setting a desired reverse acting schedule required by a particular application Lightweight and compact Can be mounted in any position mounting bracket and screws included Field adjustable spring range Can be used as a signal inverting relay Force balance operation minimizes air consumption Internal relief provides fail safe operation Amplifies air volume to minimize system lag 243 0024 Reverse Acting Relay with mounting bracket and two screws Operating range 0 to 30 psi 0 to 207 kPa Adjustment using 5 64 inch 2 mm hex wrench Range adjustment 10 to 30 psi 69 to 207 kPa Factory setting 15 psi 103 kPa Material housing Glass filled nylon Maximum ambient temperature 140 F 60 C Maximum air pressure 30 psig 207 kPa Air capacity 230 scim 63 ml s Air consumption for air compressor sizing 29 scim 8 ml s Air connections Barbed nipple for 1 4 inch 6 mm OD polyethylene tubing Mounting Mounting bracket provided Dimensions See Figures 5 and 6 Shipping weight 0 27 Ib 0 13 kg Siemens Industry Inc Technical Instructions RL 243 Reverse Acti
3. e Acting Signal Inverting Service Siemens Industry Inc Technical Instructions Document Number 155 124P25 April 1 2005 3 Make all connections according to the piping diagram 4 When disconnecting the tubing use caution to avoid damaging the barbed nipples of the relay The installation is now complete CAUTION Air supply must be clean dry and oil free The relay has an adjustment spring that allows the output range to be increased or decreased 1 Insert one gauge in the input line and another gauge in the output line Use accurate gauges when adjusting the relay 2 Insert a 5 64 inch 2 mm hex Allen wrench to adjust the spring as shown in Figure 4 3 Provide the desired maximum pressure to the input line 4 Rotate the adjustment screw until the output pressure reads the lowest desired outlet pressure RLOO68R1 Figure 4 Adjusting the Spring The spring can be adjusted to provide any range from 0 to 10 psi 0 to 69 kPa to 0 to 30 psi 0 to 207 kPa The air supply must be equal to or greater than the highest pressure in the range The spring can be adjusted for 10 to 30 psi 69 to 207 kPa resulting in a maximum output pressure of 5 to 15 psi 34 to 103 kPa respectively Adjust spring for twice the maximum output pressure desired In Figure 2 the spring is set for 15 psi 103 kPa therefore the maximum output pressure is 7 5 psi 51 kPa Do not attempt to disassemble the relay If
4. ng Relay Document Number 155 124P25 April 1 2005 Warning Caution Notations Personal injury loss of life may occur if you do not perform a procedure as specified CAUTION Equipment damage or loss of data may occur if you do not perform a procedure as specified Application This relay has two applications For both applications the supply air pressure must be equal to or greater than the spring setting Signal Reversing 1 The relay reverses a controller signal to match the operation of a control element See Figure 1 OPERATIONAL FORMULA B SP S1 OUTPUT SP 15 psi S1 B RLOO63R1 0 15 5 10 OUTPUT lt 5 INPUT 10 5 1 15 0 AIR SUPPLY I4 RL0064R1 Legend B Output pressure S2 Not used M Supply air SP Spring setting S1 Input pressure Figure 1 Reverse Acting Relay Application An increase in input pressure causes equivalent decrease in output pressure Page 2 Siemens Industry Inc RL 243 Reverse Acting Relay Technical Instructions Document Number 155 124P25 April 1 2005 Application 2 Atypical application reverses the action of a face and by pass damper actuator on a continued coil used for both heating and cooling See Figure 2 Signal Inverting OPERATIONAL FORMULA B S1 if S1 lt 1 2 SP B SP S1 if S1 gt 1 2 SP z a SP 15 psi 5 g o Input Output INPUT S1 and M B 0 0 OUTPUT 4 NPUT 3 3 ra 7 5 7 5 12 3 Legend B Output pressure S2 No
5. t used M Input pressure SP Spring setting S1 Input pressure Figure 2 Signal Inverting Application The output pressure is directly proportional to the input pressure until one half the spring setting is reached After this point the output pressure is inversely proportional to the input until the output reaches zero Operation Supply air pressure is connected to the M port The input signal is connected to the Reverse Acting S1 port The output signal is connected to the B port The S2 port is not used With no pressure at the S1 port the adjusting spring pushes down on the stack This causes the stack to contact the supply exhaust valve assembly which first closes the exhaust port then opens the supply port This allows supply air to flow into the B port chamber See Figure 3 When the pressure in the B port chamber is the same as the downward force on the stack the stack will move up causing the supply exhaust valve assembly to close the supply port Pressure at the S1 port causes an upward force on the stack that opposes the downward force caused by the adjusting spring The stack moves up allowing the exhaust port to open relieving the B port pressure When the B port pressure plus S1 pressure equals the downward force of the adjusting spring the stack will move down closing the exhaust port Siemens Industry Inc Page 3 Technical Instructions RL 243 Reverse Acting Relay Document Number 155 124P25 April 1 2005 Operation
6. the relay is inoperative replace it Page 5 Technical Instructions RL 243 Reverse Acting Relay Document Number 155 124P25 April 1 2005 Dimensions ADJUSTMENT SCREW 5 64 2 0 HEX 2 51 RLOO62R1 3 8 9 5 sgn Figure 5 Relay Dimensions _ 12 oa 6 32 TAPPED HOLE 2 PLACES 5 16 8 _ 38 ls 8 2 1 2 64 DIMENSIONS IN INCHES MILLIMETERS IN PARENTHESES RLOO69R2 Figure 6 Mounting Bracket Dimensions Information in this publication is based on current specifications The company reserves the right to make changes in specifications 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 Your feedback is important to us If you have Document No 155 124P25 Building Technologies Division comments about this document please send them Printed in the USA 1000 Deerfield Parkway to sbt_technical editor us sbt siemens com Page 6 Buffalo Grove IL 60089 1 847 215 1000
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