Honeywell Switch C437F User's Manual
Contents
1. MAIN PRESSURE TAPPING PRESSURE ORIFICE SELECTED 1 8 IN DOWEL ROD M7191A Fig 8 Installing a pressure orifice to compensate for pressure surges 60 2320 9 Honeywell Automation and Control Solutions Honeywell International Inc Honeywell Limited Honeywell Limit e 1985 Douglas Drive North 35 Dynamic Drive Golden Valley MN 55422 Scarborough Ontario M1V 4Z9 Printed in U S A on recycled 4 paper containing at least 10 60 2320 9 L Z Rev 9 95 post consumer paper fibers customer honeywell com2. Put the system into normal operation and gradually close the upstream gas shutoff valve to cause a pressure decrease When the pressure gauge indicates that the pressure is approximately equal to the setpoint the C437E or H should break contact and turn off the controlled equipment the C437F K or C637B should break R to W and make R to B The C437E or K should lock out Open the gas shutoff valve to increase the pressure again When the pressure rises to the setpoint p us the differential the C437H should make contact and turn on the controlled equipment the C437F or C637B should break R to B and make R to W Push the manual reset button Fig 2 on the C437E or K the C437E should make and the C437K should break R to B and make R to W oo Completing the Installation Remove the pressure gauge or manometer used for testing Visually recheck the piping wiring and setting Replace the cover glass and retainers Return the system pressure to normal Push the manual reset button C437D E J or K only Installing a Pressure Orifice Fig 8 To compensate for momentary surges in gas pressure install a restrictive orifice in the inlet pressure channel of the pressure switch Refer to Accessories in the Specification section for the orifice sizes available Align pressure orifice into reset located inside of the main pressure tapping at the bottom Press orifice into place using 1 8 in dowel rod
3. 1 to 26 in 50 700 mm or 0 5 7 kPa differential 1 2 to 5 1 2 in 10 140 mm or 0 1 1 4 kPa Differential Measured at 1 2 in Model Numbers 3 35 kPa differential measured at 15 in 1 2 to 5 psi 300 3500 mm or 1 to 10 psi 500 7000 mm or 5 70 kPa differential measurement measurement at midscale Type C437E F H K_ 0 25 6 4 o 06 1 1 4 31 8 0 31 1 4 176 1 72 1 2 352 3 45 Additivef ces ors sa foor a in inches of water mm millimeters of water b Restrictive orifice in inlet pressure channel to compensate for momentary surges in gas pressure Not available for C437U 4 Subtractive models switching action occurs on pressure rise to the setpoint e Not available for C437K f Additive models switching action occurs on pressure fall to the setpoint Pressure Ranges Scale Range Specify one 1 2 to 5 1 2 inches of water 10 to 140 mm of water or 0 1 to 1 4 kPa 1 to 26 inches of water 50 to 700 mm of water or 0 5 to 7 kPa 1 2 to 5 Ib per sq in 300 to 3500 mm of water or 3 to 35 kPa 1 to 10 Ib per sq in 500 to 7000 mm of water or 5 to 70 kPa Maximum Sustained Operating Pressure Maximum Pressure 1 2 to 5 1 2 in of water 1 to 26 in of water 1 2 to 5 psi 1 to 10 psi Pipe Connections Main or High Pressure 1 2 in NPT female Vent or Low Pressure 1 8 in NPT female Electrical Wiring Hole tapped for 1 2 in cond
4. Do not hand tighten the pressure switch by holding the case Follow local codes or ordinances 7 a cases when different from these recommendations Fig 1 shows the mounting dimensions for the C437 and C637 models and for the accessory mounting bracket standard on C437G and H See Fig 2 for the individual components Location Mount the gas pressure switch downstream from the pressure regulator Mount low gas pressure switches upstream of any shutoff valve Mount high gas pressure switches just upstream from the burner When pipe mounting locate the device on the portion of the pipe that is most level because the mercury switch requires level orientation See step 4 in the Mounting section MERCURY SWITCH PRESSURE SETTING INDICATOR SCALEPLATE SETTING SCREW UNDER RETAINER MANUAL RESET BUTTON CC437D E J K RETAINER LEVELING PENDULUM CONDUIT TAPPING ON SIDE NOT SHOWN LENS GASKET G H ONLY JN remove DUST SEAL LABEL BEFORE MOUNTING M7630 MAIN PRESSURE TAPPING Fig 2 Principal parts of the gas pressure switch Mounting Remove the dust seal label from the vent tapping Remove the screws and retainers and the cover glass Mount the device on the pipe or nearby vertical surface Use nipple and T for pipe mounting or the mounting bracket for surface mounting If a mounting bracket is used install the bracket before making piping connections stand
5. when the pressure falls to the setpoint None of these pressure switches will automatically return to their former positions C437D E F G H J K AND C637B GAS PRESSURE SWITCHES To reset one of these pressure switches wait until the pressure a s to the setpoint minus the differential C437D or J or sesto the setpoint plus the differential C437E or K Then depress the manual reset button Fig 2 and release it The pressure switch will not be reset until you release the manual reset button This prevents the switch from becoming an automatic reset device if the reset button is stuck held in or tied down Checkout Adjust the setpoint for normal operation and check to see that the gas pressure switch performs as intended Use a manometer or accurate pressure gauge connected upstream from the switch to measure the actual pressure The most likely cause of inaccurate operation is off level mounting Refer to step 4 in the Mounting section and correct any installation that does not check out satisfactorily C437D G or J Subtractive Differential Put the system into normal operation and set the pressure switch at the normal setpoint above the normal operating pressure Turn the setting screw Fig 2 slowly toward a lower pressure setting counterclockwise to simulate a pressure increase When the setpoint is approximately equal to the pressure indicated on the pressure gauge the C437D or G should break con
6. EAKS ON PRESSURE RISE C437E H BREAKS ON PRESSURE FALL TERMINAL STRIP M7195 Fig 4 Wiring diagram for C437D E G H 60 2320 9 MAKES ON PRESSURE FALL MAKES ON PRESSURE RISE TERMINAL STRIP C437F J K A BOTH ENDS OF THE SWITCH W R AND B R MUST BE USED AT THE SAME VOLTAGE IN THE SAME BRANCH CIRCUIT M7193 Fig 5 Wiring diagram for C437F J K MAKES R TO W ON PRESSURE RISE MAKES RTOB ON PRESSURE FALL TERMINAL STRIP ee M7194 Fig 6 Wiring diagram for C637B SETTING AND CHECKOUT Setting In the C437D G and J models the differential is subtractive The woper operating point is determined by the setpoint while the ower operating point is determined by the setpoint 7 nus the differential In the C437E F H K and C637B models the differential is ago tive The oweroperating point is determined by the setpoint while the upper operating point is determined by the setpoint p us the differential Operating points are shown in Fig 7 Remove the retainer and adjust the se vo ntfor the desired operating pressure cutout pressure on a C437D E G or H spst model by turning the setting screw Fig 2 clockwise N to increase the setpoint and counterclockwise Nto decrease it Trip Free Manual Reset Feature C437D E J and K only The C437D breaks and the C437J breaks R B and makes R W when the pressure rises to the setpoint The C437E breaks and the C437K breaks R W and makes R B
7. HES 1 Connect the high pressure side of the system to the 1 2 in NPT main pressure tapping on the gas pressure switch 2 Connect the low pressure side to the 1 8 in NPT vent tapping A WARNING No venting is possible in this case Do not use this device for differential pressure control with the hazardous gases c Negative pressure applications Connect the low pressure side to the 1 8 in NPT vent tapping WARNING This application is for use only with nonhazardous gases Do not use this device for negative pressure applications with hazardous gases A Install other controls in the system Connect wiring and complete setting and checkout before replacing the cover glass and retainers See Setting and Checkout section Wiring N CAUTION Disconnect all power to the pressure switch before connecting wiring to prevent electrical shock and equipment damage 2 When using a C437F J or K both ends of the switch W R and B R must be used at the same voltage in the same branch circuit All wiring must comply with local electrical codes ordinances and regulations Do not exceed the switch ratings given in the Specifications section Wiring diagrams for the different models are shown in Fig 4 5 and 6 The switches make or break as indicated in the diagrams Connect the wiring to the screw terminals on the terminal strip after removing the cover glass Route the wires through the conduit tapping C437D G BR
8. Honeywell C437D E F G H J K and C637B Gas Lopasca 00 30 500 700 SEALS 1 2 34 5 p 00 mm 34567 hel GENERAL The C437 and C637 Gas Pressure Switches are pressure actuated switching devices used in industrial gas system applications for safety shutoff pressure control and differential pressure control Copyright 1995 Honeywell Inc All Rights Reserved Pressure Switches PRODUCT DATA FEATURES e C437 models have direct and reverse acting spst switching C637B has single pole double throw spdt switching e Pressure ranges 1 2 to 5 1 2 in of water 10 to 140 mm of water or 0 1 to 1 4 kPa 1 to 26 in of water 50 to 700 mm of water or 0 5 to 7 kPa 1 2 to 5 psi 300 to 3500 mm of water or 3 to 35 kPa 1 to 10 psi 500 to 7000 mm of water or 5 to 70 kPa e Models intended for lockout applications must be manually reset before resuming operation e Trip free mechanism on manual reset models ensures that the limit function of the switch cannot be defeated by jamming the reset lever e External manual reset button on side of lockout models e Enclosed setting impedes tampering and provides dust resistant operation e Buna N fiber reinforced material for increased strength of control diaphragm e Two Buna N fiber reinforced seal off diaphragms for added reliability e Clear glass cover allows observation of interior mechanism to aid setting and checkout e Mercury switch provides visual indica
9. ard on C437G and H Mount the bracket horizontally with the four 10 24 flathead tapping screws provided Level the device carefully a Level the device so that the point of leveling pendulum is aligned with the mark on the inside of the case b When pipe mounting install the device at right angles to the pipe so that it can be leveled by additional tightening of the pipe fittings c The surface mounting bracket has elongated holes that allow limited leveling after the mounting screws are started d Accurate leveling is most essential at very low pressure settings e If necessary make arrangements to hold pipe mounted units steady and level with bracing PENDULUM M7196A Fig 3 Properly leveled C437 637 IMPORTANT To avoid leaks and case damage use a parallel jaw wrench on the hexagonal part of the case close to the pipe Carefully make all connections and test for leakage Do not tighten the pressure switch by holding the case Complete the main piping Connect the piping to the pressure switch Select the application from the following and proceed as instructed a Hazardous gas applications Install a 1 8 in NPT pipe at the vent tapping on all hazardous gas applications A WARNING The vent must be installed so that any gas leakage is vented into a safe place in event of a diaphragm failure b Differential pressure applications 60 2320 9 C437D E F G H J K AND C637B GAS PRESSURE SWITC
10. contained in the same mercury bulb Switch Ratings In Amperes C437E G and H C437F J K Voltage Full Load Locked Rotor Full Load Locked Rotor Resistive Load C637B 62 5 VA at 120 and 240 Vac pilot duty ORDERING INFORMATION When purchasing replacement and modernization products from your TRADELINE wholesaler or your distributor refer to the TRADELINE Catalog or price sheets for complete ordering number or specify 1 Order number 2 Pressure range 3 Replacement parts if desired 4 Accessories if desired If you have additional questions need further information or would like to comment on our products or services please write or phone 1 Your local Honeywell Home and Building Control Division Sales Office check white pages of phone directory 2 Home and Building Control Division Customer Logistics Honeywell Inc 1985 Douglas Drive North Minneapolis Minnesota 55422 4386 In Canada Honeywell Limited Honeywell Limit e 35 Dynamic Drive Scarborough Ontario M1V 4Z9 International Sales and Service offices in all principal cities of the world Manufacturing in Australia Canada Finland France Germany Japan Mexico Netherlands Spain Taiwan United Kingdom U S A 60 2320 9 2 C437D E F G H J K AND C637B GAS PRESSURE SWITCHES Switch Mercury switch C437F J and K have two spst switches in one mercury bulb Differentials Fixed nominal measured at pressure indicated Pressure Range
11. dimensions of the C437 and C637 gas pressure switches in in mm RECYCLING NOTICE This control contains mercury in a sealed tube Do ot place control in the trash at the end of its useful life If this control is replacing a control that contains mercury in a sealed tube do 7o place your old control in the trash Contact your local waste management authority for instructions regarding recycling and the proper disposal of this control or of an old control containing mercury in a sealed tube 60 2320 9 INSTALLATION When Installing this Product Read these instructions carefully Failure to follow them could damage the product or cause a hazardous condition Check the ratings given in the instructions and on the product to make sure the product is suitable for your application Installer must be a trained experienced flame safeguard control technician After installation is complete check out product operation as provided in these instructions 27 C437D E F G H J K AND C637B GAS PRESSURE SWITCHES A CAUTION Disconnect all power to the pressure switch before beginning installation to prevent electrical shock and equipment damage IMPORTANT 1 Remove the dust seal label from the vent tapping before mounting 2 Accurately level the pressure switch for proper operation 3 The C637B pressure switch is a low differential device Mount it in a vibration free location to prevent chattering 4
12. tact and turn off the controlled equipment the C437J should break R to B and make R to W The C437D or J should lock out SET POINT SWITCH BREAKS C437D LOCKS OUT SUBTRACTIVE DIFFERENTIAL C437D G PRESSURE RISE SET POINT MINUS DIFFERENTIAL SWITCH MAKES SET POINT BREAKS R B MAKES R W AND LOCKS OUT SUBTRACTIVE DIFFERENTIAL SET POINT MINUS DIFFERENTIAL BREAKS R W MAKES R B C437J PRESSURE RISE PRESSURE FALL C437E H SET POINT PLUS DIFFERENTIAL SWITCH MAKES ADDITIVE DIFFERENTIAL SET POINT SWITCH BREAKS C437E LOCKS OUT SET POINT PLUS DIFFERENTIAL BREAKS R B PRESSURE MAKES R W FALL ADDITIVE C437F K DIFFERENTIAL C637B SET POINT BREAKS R W MAKES R B C437K LOCKS OUT A ca370 AND J ARE MANUAL RESET MODELS THEY CAN BE MANUALLY RESET WHEN THE PRESSURE FALLS TO THE SET POINT MINUS THE DIFFERENTIAL AA case AND K ARE MANUAL RESET MODELS THEY CAN BE MANUALLY RESET WHEN THE PRESSURE RISES TO THE SET POINT PLUS THE DIFFERENTIAL M7197 Fig 7 C437 and C637 operating points Turn the setting screw toward a high pressure setting clockwise 7N to simulate a pressure decrease greater than the differential Tne C437G should make contact and turn on the controlled equipment Push the manual reset button Fig 2 on the C437D or J the C437D should make and the C437J should break R to W and make R to B C437E F H K or C637B Additive Differential
13. tion of switch position e Heavy die cast case increases durability and resistance to corrosion e Main control diaphragm completely enclosed a leak proof chamber can be vented to a safe area e Models with a pressure range of 1 to 26 in of water 50 to 700 mm of water or 0 5 to 7 kPa have a restrictive orifice in the inlet pressure channel to compensate for momentary surges in gas pressure e Field addable orifices of various sizes are available e Models available with rainproof dustproof sleet and ice resistant enclosure meets NEMA 3R specification Contents General seneste miar dikes estan e iSectaeas 1 Features iiine aeaea oiai aaaea araia idk eee 1 SpecificatioNS aitcestair re iiaseoirne ca Enr na TA EAR Ra aeai 2 Ordering Information ceeceeseeeceeeeeeeeeeeneesseeeeeeeseeeenees 2 Recycling Notice wis s catcinceinaneiiviandnn ieee 4 Installati n soiin aaeei iaoi 4 Setting and Checkout eeeeeeceeeeeeeeeeteeeeeeeeeeeeeeeeesaeetaees 6 60 2320 9 C437D E F G H J K AND C637B GAS PRESSURE SWITCHES SPECIFICATIONS Models Number Response at Setpoint to Pressure Change Locks Out on Switch Break C care 2 eps orowe breaks one makes one no a Designated Manual Reset 2 the trip free reset mechanism does not permit the switch to function as an automatic reset device when the manual reset lever is held in the Reset position b Weatherproof enclosure NEMA 3R available Two separate switches are
14. uit 103 4 206 8 Maximum Ambient Temperature 125 F 52 C Minimum Temperature 32 F 0 C Approvals Underwriters Laboratories Inc Listed File No MP2168 Guide No MFHX Canadian Standards Association Certified File No 1620 Guide No 380 W 1 16 Factory Mutual Approved Report No 13031 S5 and 19291 Replacement Parts 106729 Cover Glass 6 in 152 4 mm diameter 139870A Cover Glass for rainproof enclosures 106747 Cover Retaining Ring for models manufactured before 1973 118733 21 Retaining Clip for models manufactured since 1975 Accessories 4074BWK Bag Assembly Contains two 137755 Mounting Brackets and four self tapping screws for surface mounting standard on C437G and H Mounting brackets are shown by dashed lines in Fig 1 Field addable Orifices 124674 0 011 in 0 28 mm diameter 122160 0 018 in 0 46 mm diameter 60 2320 9 C437D E F G H J K AND C637B GAS PRESSURE SWITCHES Te 6 1 4 158 8 5 16 7 9 4 7 3 8 187 3 1 8 27 NPT 1 2 14 NPT A 137755 MOUNTING BRACKET 2 IN 4074BWK BAG ASSEMBLY STANDARD ON C437G AND H OPTIONAL ON OTHER MODELS Avent TAPPING REMOVE DUST SEAL LABEL BEFORE MOUNTING 6 1 2 165 1 7 3 4 196 9 1 8 3 2 1 25 4 lt 1 5 16 33 3 lt t 2 50 8 gt TAPPED FOR 1 2 IN CONDUIT 3 7 16 87 3 gt M7192 Fig 1 Installation
Download Pdf Manuals
Related Search