White Rodgers 36C74 User's Manual
Contents
1. Donotuse this appliance if any part has been under water Immediately call a qualified service technician to inspect the appliance and to replace any part of the control system and any gas control that has been under water Do not touch any electrical switch do not use any phone in your building Immediately call you gas supplier from aneighbor s LIGHTING INSTRUCTIONS STOP Read the precautionary information above 7 Wait five 5 minutes to clear out any gas If you then smell i f _ Set the thermostat to lowest setting gas STOP Follow B in the precautionary information above If you don t smell gas go to next step Tumo alltelecinical powgrtoitheappliance 8 Turn knob on gas control counterclockwise to ON This appliance is equipped with an intermittent ignition device which automatically lights the pilot Do NOT try to light the pilot by hand 10 Turn on all electrical power to the appliance 9 Replace pilot access panel s Remove the pilot access panel s located under the gas 11 Set thermostat to desired setting con Onan 12 Ifthe appliance will not operate follow the instructions To Push in gas control knob slightly and turn clockwise to Turn Off Gas To Appliance and call your service techni OFF see Figure 7 cian or gas supplier NOTE Knob cannot be turned to OFF unless knob is depressed slightly Do not use tools or excessive force TO TURN OFF GAS TO APPLIANCE Set the th2. Type 36C74 WHITE RODGERS Combination Gas Valve INSTALLATION INSTRUCTIONS Operator Save these instructions for future use FAILURE TO READ AND FOLLOW ALL INSTRUCTIONS CAREFULLY BEFORE INSTALLING OR OPERATING THIS CONTROL COULD CAUSE PERSONAL INJURY AND OR PROPERTY DAMAGE DESCRIPTION The 36C74 Gas Valve is for use on systems providing automatic ignition of the pilot and or main burners and incorporates the following features pilot redundant sole noid valve main valve integral pressure regulator and male spade terminals for point to point wiring This gas valve is also equipped with a step opening feature to provide for quieter main burner ignition The valve opens partially until main burner flame is estab lished then the valve opens to full operating pressure SPECIFICATIONS Electrical Rating 24 VAC 30 Volts max Voltage 60 Hz PIPE Sa ato apacity r at Types of Gases Natural or LP Gas 1 pressure drop across valve Pressure Rating 14 W C PSI Nat Gas LP Gas ANo oF LANO 6 Pipe Size 1000 BTU cu ft 2500 BTU cu ft Ambient Temperature 40 to 175 F 40 to 79 C inches 64 Sp Gr 1 53 Sp Gr Regulator Adjustment Range 1 3 X 3 3 100 000 Natural Gas 2 5 to 5 0 W C Full flow 1 2 x 1 2 LP Gas 7 5 to 12 0 W C Full flow 1 2 x 3 4 Step pressure not adjustable 3 4 X 3 4 280 000 Upright 90 from upright or vertical INLET BOSS UP OR DO
3. WN CONTENTS Renee LEFT OR RIGHT Description Specifications Precautions Installation Main Piping Connection X Pilot Gas Connection System Wiring Adjustment I I Pilot Flame Adjustment NOTE Control shown may not be identical Pressure Regulator Adjustment torepla ement gontrol Pilot Lighting Instructions and Precautions Figure 1 Mounting Positions B WHITE RODGERS DIVISION EMERSON ELECTRIC CO piintedin USA PART NO 37 5868A 9797 REAVIS ROAD ne Replaces 37 5153A mMeERsSON ST LOUIS MISSOURI 63123 5398 9732 PRECAUTIONS DO NOT BEGIN INSTALLATION UNTIL YOU READ THE FOLLOWING PRECAUTIONS A WARNING My Failure to turn off electric or main gas supply to heating system could cause personal in jury and or property damage by shock gas suffocation fire and or explosion Do not use this control on circuits exceeding specified voltage Higher voltage will dam age the control and may cause shock or fire hazard NEVER USE FLAME OR ANY KIND OF SPARK TO CHECK FOR GAS LEAKS COULD CAUSE FIRE AND OR EXPLOSION A CAUTION Do not short out terminals on gas valve or primary control to test Short or incorrect wiring can cause equipment damage prop erty damage and or personal injury If you do not follow these instructions exactly a fire or explosion may result causing property damage personal injury or loss of life DO NOT USE WIRE JUMPER on pilot sys tems such as standing pilot prove
4. ermostat to lowest setting 4 Depress gas control knob slightly and turn clockwise to eee OFF Do not use tools or excessive force Turn off all electrical power to the appliance if service is to be performed 5 Replace control access panel Remove control access panel Gas Cock Knob Indicator Figure 7 Gas Cock Knob If you need more information about this product please write to us at WHITE RODGERS DIVISION Emerson Electric Co 9797 Reavis Road St Louis MO 63123 5398 Attn Technical Service Department
5. n pilot or spark to pilot ignition a fire and or explo sion may result Do not use a control set for natural gas with LP gas or a control set for LP gas with natural gas Personal injury and or property damage gas suffocation fire and or explo sion may result This control is not intended for use in loca tions where it may come in direct contact with water Suitable protection must be pro vided to shield the control from exposure to water dripping spraying rain etc MAIN PIPING CONNECTIONS All piping must comply with local codes ordinances and or national fuel gas codes 1 Turn off electrical power to the system at the fuse box or circuit breaker Also turn off the main gas supply 2 Ifreplacing an existing valve disconnect all plumbing and electrical connections from the old control 3 The valve may be installed in any position except upside down The arrow on the bottom plate indi cates the direction of gas flow through the valve 4 You should use new pipe that is properly chamfered reamed and free of burrs and chips If you are using old pipe be sure it is clean and free of rust scale burrs chips and old pipe joint compound 5 Apply pipe joint compound pipe dope or teflon tape that is approved for all gases only to the male threads of the pipe joints DO NOT apply com pound or teflon tape to the first two threads see fig 2 for typical piping connections 6 Ifyou are using a vise or
6. open end wrench to hold the valve while installing piping do not tighten exces sively as this may damage the valve 7 See SYSTEM WIRING when making electrical con nections After all gas and electrical connections are completed turn gas on and check for gas leaks with leak detection solution or soap suds Bubbles forming indicate a leak SHUT OFF GAS AND FIX ALL LEAKS IMMEDIATELY PILOT GAS CONNECTION The valve is shipped with the pilot outlet plugged For installations requiring pilot gas remove the plug and use the fitting packed separately with the control Install fitting into pilot gas outlet see fig 3 turning until finger tight Insert clean deburred tubing all the way through the fitting While holding the tubing securely slowly tighten fitting until you feel a slight give Tighten the fitting an additional 1 turns INSTALLATION Drop Horizontal o NOTE Riser Always Include A Drip Leg In Piping Gas Valve 3 in minimum Piped Gas Supply Figure 2 Typical gas valve piping Pilot Gas Outlet Gas Outlet Figure 3 Gas valve side view INSTALLATION con t SYSTEM WIRING REFER TO AND FOLLOW THE APPLIANCE MANUFACTURER S WIRING DIAGRAM REFER TO FIG 4 FOR TERMINAL IDENTIFICATION All wiring should be installed in accordance with local and national electrical codes and ordinances Check that the electrical power supply used agrees with the voltage and fre
7. quency shown on the gas control Main Valve OQ Redundant Valve Coil Pilot Valve Figure 4 Typical gas valve wiring ADJUSTMENT PILOT FLAME ADJUSTMENT This control was factory preset and will not normally require additional adjustment of pilot flame If the pilot flame is low and does not engulf the bulb of the mercury flame sensor the system will not energize the main valve If pilot gas pressure is too high gas will sputter past the ignition electrode and may not ignite High pilot gas pressure may also cause the flame to lift off the burner causing the flame sensor bulb to sense low heat To adjust the pilot flame remove the pilot adjust cover screw and gasket see fig 6 to expose adjusting screw To REDUCE pilot flame turn the pilot adjust screw clockwise To INCREASE pilot flame turn the pilot adjust screw counterclockwise Replace and tighten cover screw and gasket Pilot Adjust Cover Screw ox Gasket l Pilot Adjust N Screw Figure 5 Pilot flame adjustment PRESSURE REGULATOR ADJUSTMENT The pressure regulator has been factory adjusted for 3 5 W C Natural Gas full flow or 11 0 W C LP Gas full flow Although additional adjustments will not nor mally be necessary the regulator may be adjusted if required Do not force the adjusting screw beyond the limits that it can easily be adjusted 1 Attach a manometer to the outlet pressure tap of the valve 2 Ene
8. rgize valve to ignite main burner 3 Remove Reg Adj cover screw see fig 6 4 To DECREASE outlet pressure turn the adjusting screw beneath the cover screw counterclockwise To INCREASE outlet pressure turn the adjusting screw clockwise 5 Replace the cover screw Cycle the valve two or three times to verify regulator setting NATURAL LP GAS SELECTOR REGULATOR COVER SCREW PILOT ADJUST COVER SCREW Figure 6 Gas valve top PILOT LIGHTING INSTRUCTIONS AND PRECAUTIONS FOR YOUR SAFETY READ BEFORE LIGHTING A WARNING If you do not follow these instructions exactly a fire or explosion may result causing property damage personal injury or loss of life A This appliance is equipped with an intermittent ignition phone Follow the gas supplier s instructions device which automatically lights the pilot Do NOT try to light the pilot by hand BEFORE LIGHTING smell all around the appliance area for gas Be sure to smell next to the floor because some gas is heavier than air and will settle on the floor If you cannot reach your gas supplier call the fire department C Use only your hand to push in or turn the gas control knob Never use tools If the knob will not push in or turn by hand don t try to repair it call a qualified service techni FOR YOUR SAFETY cian Force or attempted repair may result in a fire of WHAT TO DO IF YOU SMELL GAS explosion Do not try to light any appliance
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