Honeywell VR8304 User's Manual
Contents
1. IF CHECKING GAS INPUT BY CLOCKING THE GAS METER Ensure that the only gas flow through the meter is that of the appliance being tested Ensure that other appliances are turned off and that their pilot burners are extinguished or deduct their gas consumptions from the meter reading Convert the flow rate to Btuh as described in the Gas Controls Handbook form number 70 2602 69 0625 03 and compare to the Btuh input rating on the appliance nameplate IF CHECKING GAS INPUT WITH A MANOMETER PRESSURE GAUGE Ensure the gas control knob is in the PILOT position before removing the outlet pressure tap plug to connect the manometer Turn the gas control knob back to PILOT when removing the manometer and replacing the outlet pressure tap plug Shut off the gas supply at the appliance service valve or for LP gas at the gas tank before removing the outlet pressure tap plug and before disconnecting the manometer and replacing the outlet pressure tap plug Perform the gas leak test at the inlet pressure tap plug Standard opening and slow opening pressure regulator 1 2 3 4 The gas control outlet pressure should match the manifold pressure listed on the appliance name plate With the main burner operating check the gas con trol flow rate using the meter docking method or check the gas pressure using a manometer con nected to the gas control outlet pressure tap Refer to Fig 4 If necessar2. tions if available otherwise use the instructions provided below Converting Between Natural and LP Gas A WARNING Fire or explosion hazard Can cause property damage severe injury or death Do not attempt to use a gas control set for natural gas on LP gas or a gas control set for LP gas on natural gas 69 0625 03 To convert a gas control from natural gas to LP gas or from LP gas to natural gas contact your Honeywell representative Standard or slow opening gas controls are converted from one gas to another with a conversion kit order separately Order Part Number 393691 to convert from natural to LP gas Order Part Number 394588 to convert from LP to natural gas Step opening gas controls cannot be converted Install Adapters to Gas Control Install adapters to the gas control as follows Flanges 1 Choose the appropriate flange for your application 2 Remove the seal over the gas control inlet or outlet 3 Ensure the O ring is fitted in the groove of the flange If the O ring is not attached or is missing do not use the flange 4 With the O ring facing the gas control align the Screw holes on the gas control with the holes in the flange Insert and tighten the screws provided with the flange See Fig 1 Tighten the screws to 25 in pounds of torque to provide a gas tight seal 9 64 INCH HEX SCREWS 4 GAS CONTROL OUTLET FLANGE AN DO NOT OVERTIGHTEN SCREWS TIGHTEN TO 25 INCH POUN
3. x to increase or counter clockwise to decrease the main burner gas pressure c Always replace the cap screw and tighten firmly to ensure proper operation If the desired outlet pressure or flow rate cannot be achieved by adjusting the gas control check the inlet pressure using a manometer at inlet pressure tap or upstream of the gas control If the inlet pressure is in the normal range refer to Table 6 or 7 replace the existing gas control Otherwise take the necessary steps to provide proper gas pressure to the gas control VR8304 INTERMITTENT PILOT COMBINATION GAS CONTROL 5 Carefully check main burner lightoff at the step pres sure Ensure the main burner lights smoothly and with out flashback to the orifice and that all ports remain lit Cycle the main burner several times allowing at least 30 seconds between cycles for the regulator to resume the step function Repeat after allowing the main burner to cool Readjust the full rate outlet pres sure if necessary to improve lightoff characteristics Table 6 Pressure regulator specification pressures in inches WC Outlet Pressure Nominal inlet Nominal factory setting Setting range Model Type of gas pressure range Step Full rate Step Full rate Standard slow opening Natural 5 0 7 0 3 5 3 0 5 0 LP 12 0 14 0 11 0 8 0 12 0 Step opening Natural 5 0 7 0 0 9 3 5 3 0 5 0 LP 12 0 14 0 22 11 0 8 0 12 0 Table 7 Pressure regul
4. control circuit for proper operation 5 If 24V is present replace the gas control INSTRUCTIONS TO THE HOMEOWNER A WARNING Fire or explosion hazard Can cause property damage severe injury or death Follow these warnings exactly 1 Pilot flame is lit automatically Do not light the pilot flame manually 2 Before lighting the pilot burner flame smell around the appliance for gas Be sure to smell close to the floor because LP gas is heavier than air 3 IF YOU SMELL GAS Turn off the gas supply at the appliance service valve on LP gas systems turn off gas supply at the gas tank Do not light any appliances in the house Automation and Control Solutions Honeywell International Inc 1985 Douglas Drive North Golden Valley MN 55422 customer honeywell com 35 Dynamic Drive U S Registered Trademark 2008 Honeywell International Inc 69 0625 03 Rev 10 08 Do not touch electrical switches or use the phone Leave the building and use a neighbor s phone to call your gas supplier f you cannot reach your gas supplier call the fire department 4 Do notforce the gas control knob Use only your hand to push down or turn the gas control knob Never use tools If the gas control knob will not operate by hand the gas control should be replaced by a qualified service technician Force or attempted repair may result in a fire or explosion 5 The gas control must be replaced in case of any
5. through one complete cycle to ensure all controls operate properly MAINTENANCE A WARNING Fire or explosion hazard Can cause property damage severe injury or death Improper cleaning or reassembly may cause gas leakage When cleaning ensure that the control is reassembled properly and perform the gas leak test Regular preventive maintenance is important in applications that place a heavy load on system controls such as in the commercial cooking and agricultural and manufacturing industries because n many such applications particularly commercial cooking the equipment operates 100 000 to 200 000 cycles per year Such heavy cycling can wear out the gas control in one to two years Exposure to water dirt chemicals and heat can damage the gas control and shut down the control system The maintenance program should include regular checkout of the gas control as outlined under STARTUP AND CHECKOUT on page 4 and the control system as described in the appliance manufacturer s literature Maintenance frequency must be determined individually for each application Some considerations are Cycling frequency Appliances that might cycle 100 000 times annually should be checked monthly Intermittent use Appliances that are used seasonally should be checked before shutdown and again before the next use Consequence of unexpected shutdown Where the cost of an unexpected shutdown would be high the system should
6. 3 hr 11 8 m3 r Body pattern Straight through body pattern Inlet x outlet sizes available 1 2 x 1 2 in 1 2 x 3 4 in and 3 4 x 3 4 in factory installed inlet flange Adapters Adapters available for 3 8 1 2 and 3 4 in straight and angle connections Refer to Table 2 Electrical Ratings voltage and frequency 24 Vac 50 60 Hz Current Draw 0 7A Capacity See Table 3 Approvals American Gas Association Design Certificate UP 70 69A Canadian Gas Association Design Certificate UP 70 69A Australian Gas Association Certificate Applied for Delta C Applied for Capacity based on 1000 Btu ft 0 64 specific gravity natural gas at 1 in WC pressure drop 37 3 MJ m 0 64 specific gravity natural gas at 0 25 kPa pressure drop Use conversion factors in Table 4 to convert capacities for other gases Table 4 Gas capacity conversion factors Multiply listed Gas Specific gravity capacity by Manufactured 0 60 0 516 Mixed 0 70 0 765 Propane 1 53 1 62 69 0625 03 VR8304 INTERMITTENT PILOT COMBINATION GAS CONTROL INSTALLATION When installing this product 1 Read these instructions carefully Failure to follow them could damage the product or cause a hazardous condition 2 Check the ratings given in the instructions and on the product to ensure the product is suitable for your application 3 Ensure installer is a trained experienced servic
7. DS Fig 1 Install flange to gas control Bushings 1 Remove the seal over the gas control inlet or outlet 2 Apply moderate amount of good quality pipe com pound to the bushing leaving two end threads bare On LP installation use a compound resistant to LP gas Do not use Teflon tape 3 Insert the bushing into the gas control and thread the pipe carefully into the bushing until tight Using Adapters to Solve Swing Radius Problems In some field service applications it is difficult or impossible to thread the gas control onto the gas supply pipe because of space limitations This problem can be resolved in many instances by using an adapter The adapter is installed on the end of the supply pipe in place of the gas control following the same precautions and instructions that are used for installing the gas control After the adapter is installed the gas control is attached to the adapter as outlined above Note that using an adapter increases the overall length of the gas control VR8304 INTERMITTENT PILOT COMBINATION GAS CONTROL Choose Gas Control Location Do not locate the gas control where it may be affected by steam cleaning high humidity dripping water corrosive chemicals dust or grease accumulation or excessive heat To ensure proper operation follow these guidelines Locate the gas control in a well ventilated area Mount the gas control high enough above the cabinet bottom to avoid exposure to floodi
8. Honeywell VR8304 Intermittent Pilot Combination Gas Control APPLICATION These intermittent pilot gas controls are used in gas fired appliances with capacities up to 300 fi hr at 1 in WC pressure drop 8 5 m h at 0 25 kPa on natural gas They include a manual valve two automatic operators and a pressure regulator See Table 1 for temperature ranges and regulator types Table 1 Temperature ranges and regulator types INSTALLATION INSTRUCTIONS Table 2 Flange part numbers Inlet outlet pipe size Flange type Part number 3 8 inch NPT Straight 393690 11 1 2 inch NPT Elbow 393690 13 3 4 inch NPT Straight 393690 4 Elbow 393690 15 NOTE Flange kits include one flange with attached O ring and fan mounting screw Ambient Model number temperature range Regulator type Table 3 Capacity VR8304H to 175 F Slow opening Size Capacity at1in Minimum Maximum 18 C to 79 C inlet x WC pressure regulated regulated VR8304K 40 F to 175 F Slow opening outlet drop capacity capacity 40 C to 79 C VEESUM REE ua 1 2x 1 2 240 ft hr 30 ft hr 340 ft hr 40 C to 790 pening 6 8 0 8 m3 hr 9 6 m3 hr VR8304P 40 F to 175 F Step opening 1 2 X 3 4 270 3 30 ft hr 370 ft hr 40 C to 79 C 7 6 m hr 0 8 m hr 10 5 m3 hr 3 4 X 3 4 300 ft hr 30 ft hr 415 ft hr SPECIFICATIONS 8 5 m3 hr 0 8 m
9. LEG TO TRANSFORMER VR8304 COMBINATION PV MV GAS CONTROL Fig 7 VR8304 wiring connections in an intermittent ignition system with S86 S8610F H Z VENT GND 24V DAMPER MV Mv PV PV BURNER GND 24y THw PLUG SPARK PV MV WIRING HARNESS THERMO STAT D80D VENT DAMPER LIMIT IGNITERE CONTROLLER SENSOR L1 HOT A L2 PILOT BURNER GROUND 1 A POWER SUPPLY PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED A ALTERNATE LIMIT CONTROLLER LOCATION A CONTROLS IN 24V CIRCUIT MUST NOT BE IN GROUND LEG TO TRANSFORMER REMOVE PLUG ONLY IF USING VENT DAMPER FUSE BLOWS ON STARTUP WHEN PLUG IS REMOVED AND VENT DAMPER WIRING HARNESS IS INSTALLED THEN MODULE WILL OPERATE ONLY WHEN VENT DAMPER IS CONNECTED M1507 Fig 8 VR8304 wiring connections in intermittent ignition system with S8600 5 69 0625 03 VR8304 INTERMITTENT PILOT COMBINATION GAS CONTROL Perform Gas Leak Test A WARNING Fire or explosion hazard Can cause property damage severe injury or death Check for gas leaks with a rich soap and water solution any time work is done on a gas control cas leak test 6 Paint all pipe connections upstream of the gas trol with a rich soap and water solution Bubbles indicate a
10. SHOWN IN TABLE FOR INSERTION INTO GAS CONTROL APPLY A MODERATE AMOUNT OF PIPE COMPOUND TO PIPE ONLY LEAVE TWO END THREADS BARE M3075B Fig 3 Use a moderate amount of pipe compound PRESSURE REGULATOR ADJUSTMENT UNDER CAP SCREW WIRING v TERMINALS 3 OUTLET PRESSURE TAP INLET PRESSURE TAP PILOT ADJUSTMENT UNDER CAP SCREW M1639C RED RESET BUTTON GAS CONTROL KNOB Fig 4 Top view of gas control Connect Pilot Gas Tubing 1 Cuttubing to desired length and bend as necessary for routing to the pilot burner Do not make sharp bends or deform the tubing Do not bend tubing at gas control or pilot burner after compression fitting has been tightened as this may result in gas leak age at the connection 2 Square off and remove burrs from the ends of tubing 3 69 0625 03 VR8304 INTERMITTENT PILOT COMBINATION GAS CONTROL WHEN FLANGE IS NOT USED APPLY WRENCH FROM TOP OR BOTTOM OF GAS CONTROL TO EITHER SHADED AREA WHEN FLANGE IS USED APPLY WRENCH TO FLANGE ONLY M3079 Fig 5 Proper use of a wrench on a gas control with and without flanges 3 Unscrew compression titling from the pilot outlet Fig 4 4 Slip the compression fitting over the tubing and slide out of the way 5 Push the tubing into the pilot gas tapping on the outlet end of the control until it bottoms While hold ing tubing all the way in slide compression flitting into place and enga
11. ath Do not force the gas control knob Use only your hand to turn the gas control knob Never use tools If the gas control knob will not operate by hand the gas control should be replaced by a qualified service technician E N Gas Control Knob Settings The gas control knob has two settings OFF prevents pilot and main burner gas flow ON permits gas to flow into the control body Under control of the thermostat and intermittent pilot module pilot and main burner gas flow is permitted NOTE Gas controls are shipped with the gas control knob in the ON position Turn on the System Rotate the gas control knob counterclockwise ON Turn on the Main Burner Follow the instructions provided by the appliance manufacturer or turn the thermostat up to call for heat COMBUSTION AIR BLOWER RELAY VR8304 INTERMITTENT PILOT COMBINATION GAS CONTROL LIMIT CONTROLLER i Abu Nei A A HOT L2 THERMOSTAT OR CONTROLLER 586 MODULE GAS CONTROL TERMINALS AIR PROVING SWITCH BURNER PILOT BURNER COMBUSTION GROUND O O JAIR BLOWER 5 ae Q348 MOTOR 1 PILOT BURNER PILOT GAS IGNITER SENSOR SUPPLY L1 L2 HOT POWER SUPPLY PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED A ALTERNATE LIMIT CONTROLLER LOCATION A MAXIMUM CABLE LENGTH 3 FT 0 9M M18851 A CONTROLS IN 24V CIRCUIT MUST NOT BE IN GROUND
12. ator specification pressures in kPa Outlet Pressure Nominal inlet Nominal factory setting Setting range Model Type of gas pressure range Step Full rate Step Full rate Standard slow opening Natural 1 2 1 7 0 9 0 7 1 2 LP 2 9 3 9 2 7 2 0 3 0 Step opening Natural 1 2 1 7 0 2 0 9 0 7 1 2 LP 2 9 3 9 0 9 2 7 2 0 3 0 Check Safety and Shutdown Performance A WARNING Fire or explosion hazard Can cause property damage severe injury or death Perform the safety shutdown test any time work is done on a gas system Read steps 1 7 below before starting and compare to the safety shutdown or safety lockout tests recommended for the intermittent pilot IP module Where they differ use the procedure recommended for the module 1 Turn gas supply off 2 Setthe thermostat or the controller above room temperature to call for heat 3 Watch for spark at the pilot burner either immediately or following prepurge See IP module specifications 4 Ifthe module has timed ignition time the length of spark operation See IP module specifications 5 After the module locks out open the gas control knob and ensure there is no pilot or main burner gas flow With modules that continue to spark until pilot lights or system is shut down manually the pilot should light when gas control knob is opened 6 Setthe thermostat below room temperature and wait one minute 7 Operate the system
13. be checked more often Dusty wet or corrosive environment Since these environments can cause the gas control to deteriorate more rapidly the system should be checked more often The gas control should be replaced if It does not perform properly on checkout or troubleshooting Itis likely to have operated for more than 200 000 cycles The gas control knob is hard to turn or push down or it fails to pop back up when released 7 69 0625 03 VR8304 INTERMITTENT PILOT COMBINATION GAS CONTROL Service A WARNING Fire or explosion hazard Can cause property damage severe injury or death Do not disassemble the gas control it contains no replaceable components Attempted disassembly or repair may damage the gas control N CAUTION Do not apply a jumper across or short the valve coil terminals Doing so may burn out the heat anticipator in the thermostat or damage the electronic module IMPORTANT Allow 60 seconds after shutdown before re energizing the step opening module to ensure lightoff at steppressure IF MAIN BURNER WILL NOT COME ON WITH CALL FOR HEAT 1 Ensure the gas control knob is in the ON position 2 Adjustthe thermostat several degrees above room temperature 3 Using an AC voltmeter check for 24V at gas control If pilot lights measure across MV PV and MV If pilot does not light measure across MV PV and PV before safety lockout occurs 4 f voltage is incorrect or not present check
14. ble 5 for insertion into the gas control or adapter DO NOT THREAD THE PIPE TOO FAR Valve distortion or malfunction may result if the pipe is inserted too deeply into the gas control 4 Apply a moderate amount of good quality pipe com pound DO NOT use Teflon tape to the pipe only leaving two end threads bare On LP installations use a compound resistant to LP gas Refer to Fig 3 5 Remove the seals over the gas control inlet and outlet if necessary 6 Connectthe pipe to the gas control inlet and outlet Use a wrench on the square ends of the gas control If an adapter is used place the wrench on the adapter rather than the gas control Refer to Figs 4 and 5 Table 5 NPT pipe thread length inches Maximum depth pipe Thread pipe this can be inserted into the Pipe size amount control 318 9 16 3 8 1 2 3 4 1 2 3 4 13 16 3 4 DROP PIPED HORIZONTAL GAS RISER PIPED GAS SUPPLY 76 MM MINIMUM 2 TUBING 76 MM TT A GAS MINIMUM SUPPLY 1 E pog EN bog RISER 1 76 MM 1 MINIMUM E TN AN ALL BENDS IN METALLIC TUBING SHOULD BE SMOOTH CAUTION SHUT OFF THE MAIN GAS SUPPLY BEFORE REMOVING END CAP TO PREVENT GAS FROM FILLING THE WORK AREA TEST FOR GAS LEAKAGE WHEN INSTALLATION IS COMPLETE 7 Fig 2 Install a sediment trap TWO IMPERFECT THREADS GAS CONTROL THREAD PIPE THE AMOUNT
15. e technician 4 After installation is complete use these instructions to check out product operation A WARNING Fire or explosion hazard Can cause property damage severe injury or death Follow these warnings exactly 1 Disconnect power supply before wiring to prevent electrical shock or equipment damage To avoid dangerous accumulation of fuel gas turn off gas supply at the appliance service valve before starting installation and perform N the gas leak test after completion of installation w Do not bend pilot tubing at gas control or pilot burner after compression fitting has been tightened or gas leakage at the connection may result 4 Always install sediment trap in gas supply line to prevent contamination of gas control Do not force the gas control knob Use only your hand to turn the gas control knob Never use tools If the gas control knob will not operate by hand the gas control should be replaced by a qualified service technician Force or attempted repair may result in fire or explosion N CAUTION Never apply a jumper across or short the valve coil terminals This may burn out the heat anticipator in the thermostat or damage the electronic intermittent pilot IP module a IMPORTANT These gas controls are shipped with protective seals over inlet and outlet tappings Do not remove the seals until you are ready to connect piping Follow the appliance manufacturer s instruc
16. gas leak If a gas leak is detected tighten the pipe connection Stand clear while lighting the main burner to prevent injury caused from hidden gas leaks which could cause flashback in the appliance vestibule Light the main burner With the main burner in operation paint all pipe joints including adapters and the gas control inlet and outlet with a rich soap and water solution If another gas leak is detected tighten adapter screws joints and pipe connections Replace the part if the gas leak cannot be stopped Adjust the Pilot Burner Flame The pilot flame should envelop 3 8 to 1 2 in 10 13 mm of the igniter sensor tip See Fig 9 To adjust the pilot flame 1 2 3 Remove the pilot adjustment cover screw Refer to Fig 4 Turn the inner adjustment screw clockwise to decrease or counterclockwise 4 to increase the pilot flame Always replace the cover screw after adjustment and tighten firmly to ensure proper operation PROPER FLAME ADJUSTMENT 3 8 TO 1 2 INCH 10 TO 13 mm i IGNITER SENSOR M3080A Fig 9 Proper flame adjustment Check and Adjust Gas Input to Main Burner N CAUTION 1 Do not exceed the input rating stamped on the appliance nameplate or the manufacturer s recommended burner orifice pressure for the size of orifice s used Ensure the main burner primary air supply is properly adjusted for complete combustion refer to the appliance manufacturer s instructions
17. ge threads turn until finger tight Then tighten one more turn with a wrench Do not overtighten Refer to Fig 6 6 Connect other end of the tubing to pilot burner according to the pilot burner s manufacturer s instructions NOTE When replacing a gas control cut off old com pression fitting and replace it with the new com pression fitting provided on the gas control Never use the old compression fitting as it may not provide a gas tight seal Va GAS CONTROL ae MOHTEN NUT ONE TURN BEYOND FINGER TIGHT TO PILOT BURNER FITTING BREAKS OFF AND CLINCHES TUBING AS NUT IS TIGHTENED Fig 6 Always use new compression fitting WIRING Follow the wiring instructions furnished by the appliance manufacturer if available or use the general instructions provided below M3076B All wiring must comply with applicable electrical codes and ordinances Disconnect power supply before making wiring connections to prevent electrical shock or equipment damage 1 Check the power supply rating on the gas control and ensure it matches the available supply Install transformer thermostat and other controls as required 69 0625 03 2 Connect the control circuit to the gas control termi nals See Figs 4 and 7 or 8 3 Adjustthe thermostat heat anticipator to 0 70 rating stamped on valve operator STARTUP AND CHECKOUT A WARNING Fire or explosion hazard Can cause property damage severe injury or de
18. ng or splashing water Ensure the ambient temperature does not exceed the ambient temperature ratings for each component Cover the gas control if the appliance is cleaned with water steam or chemicals or to avoid dust and grease accumulation Avoid locating the gas control where exposure to corrosive chemical fumes or dripping water is likely Locate the gas control in the appliance vestibule on the gas manifold In replacement applications locate the gas control in the same location as the old gas control Install Piping to the Gas Control All piping must comply with local codes and ordinances or with the National Fuel Gas Code ANSIZ223 1 NFPA No 54 whichever applies Tubing installation must comply with approved standards and practices Use new properly reamed pipe free of chips If tub ing is used ensure the ends are square deburred and clean All tubing bends must be smooth and without deformation 2 Runa pipe or tubing to the gas control If tubing is used obtain a tube to pipe coupling to connect the tubing to the gas control 3 Install a sediment trap in the supply line to the gas control See Fig 2 Install the Gas Control 1 Mount the gas control 0 90 degrees in any direction from the upright position of the gas control knob including vertically 2 Mountthe gas control so that gas flow is in the direc tion of the arrow on the bottom of the gas control 3 Thread the pipe the amount shown in Ta
19. ning off the Appliance VACATION SHUTDOWN Set the thermostat to the desired room temperature while you are away COMPLETE SHUTDOWN Push the gas control knob in slightly and turn clockwise x to OFF Do not force Appliance will completely shut off Follow the lighting procedures above to resume normal operation Honeywell Limited Honeywell Limit e Toronto Ontario M1V 4Z9 Honeywell Printed in Mexico
20. physical damage tampering bent terminals miss ing or broken parts stripped threads or evidence of exposure to heat IMPORTANT Follow the operating instructions provided by the manufacturer of your heating appliance The information below will be of assistance in a typi cal gas control application but the specific con trols used and the procedures outlined by the manufacturers of your appliance may differ requiring special instructions STOP READ THE WARNINGS ABOVE The pilot flame is lit automatically If the appliance does not turn on when the thermostat is set several degrees above the room temperature follow these instructions 1 Setthe thermostat to its lowest setting to reset the safety control 2 Disconnect all electric power to the appliance 3 Remove the gas control access panel 4 Pushin the gas control knob slightly and turn clockwise to OFF 5 Wait five minutes to clear out any unburned gas If you then smell gas STOP Follow Step 3 in the Warnings above If you do not smell gas continue with the next step 6 Turn the gas control knob counterclockwise to PILOT 7 Turn the gas control knob counterclockwise to ON 8 Replace the gas control access panel 9 Reconnect all electric power to the appliance 10 Set the thermostat to the desired setting 11 If the appliance does not turn on set the gas con trol knob to OFF and contact a qualified service technician for assistance Tur
21. y adjust the pressure regulator to match the appliance rating Refer to Table 5 or 6 for the factory set nominal outlet pressures and adjustment ranges a Remove the pressure regulator adjustment cap and screw b b Using a screwdriver turn the inner adjustment screw clockwise to increase or counter clockwise 4 to decrease the main burner gas pressure c Always replace the cap screw and tighten firmly to ensure proper operation If the desired outlet gas pressure or gas flow rate can not be achieved by adjusting the gas control check the gas control inlet pressure using a manometer at the inlet pressure tap If the inlet pressure is in the nor mal range refer to Table 6 or 7 replace the gas con trol Otherwise take the necessary steps to provide proper gas pressure to the gas control Step opening pressure regulator 1 2 3 4 The gas control outlet pressure should match the manifold pressure listed on the appliance nameplate With the main burner operating check gas control flow rate using the meter clocking method or check the gas pressure using a manometer connected to the gas control outlet pressure tap Refer to Fig 4 If necessary adjust the pressure regulator to match the appliance rating Refer to Table 5 or 6 for factory set nominal outlet pressures and adjustment ranges a Remove pressure regulator adjustment cap screw b Using a screwdriver turn the inner adjustment screw clockwise
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