White Rodgers 37C73U Thermostat User Manual
Contents
1. 8 BEFORE LIGHTING THE PILOT CHECK THE GAS LINES FOR LEAKS Use a soapy water solution DO NOT test for gas leaks using a match or open flame Brush the soapy water solution on all gas pipes joints and fittings Check for bubbling soap indicating you have a leak Turn OFF the gas and make the necessary repairs Recheck for leaks Rinse off soapy solution and wipe dry 9 Affix the new Lighting instruction label on the water heater to cover the existing label TO LIGHT APPLIANCE FIGURE A GAS CONTROL KNOB OFF POSITION TEMPERATURE MAIN BURNER FIGURE B O O PILOT POSITION ON POSITION PILOT FIGURE C NOCOCOOOO00 00000000 Y THERMOCOUPLE POINTER WATER TEMPERATURE DIAL Figure 2 Gas Control Knob and Water Temperature Dial A Gas valve thermositat without ignitor If control has an ignitor proceed to Section B f 10 11 Set control to lowest setting by turning the water temperature dial clockwise to the PILOT LIGHTING position DO NOT FORCE Turn gas control knob clockwise to OFF See FIGURE A NOTE Gas control knob must be depressed slightly to turn from PILOT to OFF Do not use tools or excessive force Wait at least five 5 minutes to clear out any gas and then smell around the appliance area If you smell gas O STOP Follow instructions What to do if you smell gas on the first page of this instruction sheet If you d2. different settings is shown in the following table To avoid scald injury set the control at the lowest setting which will still deliver your needed hot water TO TURN OFF GAS TO APPLIANCE Set the control to lowest setting by turning water temperature dial clockwise to the PILOT LIGHTING position on dial as shown in Figure 3 DO NOT FORCE n Turn gas control knob clockwise to PILOT O BLOW A WARNING The hotter the water the greater the risk of scald injury and the shorter the time to cause injury APPROXIMATE SETTING TEMPERATURE F APPROXIMATE TIME TO CAUSE INJURY e io ssena VERY 160 Under 1 Second HOT Be sure to protect babies and the infirm or others with impaired mobility who cannot get out of the hot water quickly They are the people most commonly hurt in scald injuries and in need of lower temperature and other protection like supervision point of use temperature control equipment or a system mixing valve A point of use valve or a system mixing valve can be obtained from your plumber Never allow children to use a hot water tap or to draw their own bath water Never leave a child or impaired person unattended in a bathtub or shower Scald burns can result Z N Turn gas control knob clockwise to OFF a iy Gas control knob must be depressed slightly to turn from PILOT to OFF Do not use tools or excessive force OQ CLO White y White Rodgers is a
3. remain lit If it goes out repeat step 3 through 9 It may take several minutes for air to clear the lines before the pilot will light e Ifthe pilot does not pop up when released stop and immediately call your service technician or gas supplier e Ifthe pilot will not stay lit after several tries turn the gas control knob clockwise __ to OFF and call your service technician or gas supplier 11 Once the pilot flame is established replace the outer burner door 12 At arms length away turn gas control knob counter clockwise YO to ON See FIGURE C 13 Set the thermostat to desired setting See TEMPERA TURE REGULATION on page 4 TEMPERATURE REGULATION After the gas connections are made water is in the heater and the pilot light is ignited the control must be set to the desired water temperature The recommended water temperature dial setting is at the ar row A The water temperature out of the heater at this setting will be approximately 120 F If you use hot water frequently and in short spurts water tem perature can occasionally exceed the temperature setting by up to 30 F because of the dynamics of the appliance TEMPERATURE POINTER WATER TEMPERATURE DIAL Figure 3 Water Temperature Dial The arrow A setting is the safest and most economical If the want hotter water rotate the water temperature dial coun terclockwise ECN to a higher setting Approximate water temperature delivered at the
4. 37C73U Water Heater Thermostat Control Installation Instructions FOR NATURAL GAS ONLY White y Rodgers RETAIN INSTRUCTIONS FOR FUTURE REFERENCE FOR YOUR SAFETY WHAT TO DO IF YOU SMELL GAS Do not try to light any appliance Do not touch any electrical switch do not use any phone in your building Immediately call your gas supplier from a neighbor s phone Follow the gas supplier s instructions If you cannot reach your gas supplier call the fire department Do not use this Natural Gas control on a LP Gas water heater Improper operation could occur resulting in personal injury and or death due to Carbon Monoxide poisoning fire or explosion Check for proper gas type as listed on the rating plate affixed to the water heater Fixed Adjustment Main and Pilot Regulators The main and pilot gas regulators require no field service They automatically control and maintain the outlet main and pilot burner gas pressure Model Main Regulator__ PilotRegulator_ Flange Outlet _ FlyingLeads FAILURE TO READ AND FOLLOW ALL INSTRUCTIONS BEFORE INSTALLING OR OPERATING THIS CONTROL COULD CAUSE PROPERTY DAMAGE PERSONAL INJURY AND OR DEATH 1 This control must be installed or serviced only by a 6 In some situations the gas may lose its odor To detect professional unodorized gas you must have a gas detector which can 2 Do not use force when moving the gas control knob If you be purchased from y
5. Valve Thermostat with ignitor 1 O STOP Read the safety information on the label 2 Set the thermostat to lowest setting PILOT LIGHT ING Turn thermostat dial fully clockwise 7 until it stops 3 Push the gas control knob down slightly and turn clockwise to OFF see FIGURE A NOTE Knob CANNOT be turned from PILOT to OFF unless it is pushed down slightly Do not force 4 Remove the outer burner door located below the gas control 5 Wait five 5 minuted to clear our any gas If you then smell gas STOP Follow instructions What to do if you smell gas on the first page of this instruction sheet If you do not detect gas continue with the next step 6 This unit is equipped with a push button pilot ignitor which is used to light the pilot Locate the ignitor on the gas control 7 Turn gas control knob counterclockwise CN to PILOT see FIGURE B 8 The pilot is located on the right side of the burner It can be located by looking through the glass view port while pressing the piezo ignitor button several times Look for a spark at the pilot location FIGURE D 9 Once the pilot has been found push the gas knob all the way down Immediately press the pilot ignitor but ton rapidly 4 to 5 times If the pilot will not light repeat step 3 through 9 10 Continue to hold the gas control knob down for about one 1 minute after the pilot is lit Release the gas control knob and it will pop back up Pilot should
6. as control valve thermostat Before performing any maintenance turn the temperature dial on the gas control valve thermostat to the lowest setting See To light Appliance Figure 2 3 On the top of the gas control valve turn the gas control knob to the Off position See To light Appliance Figure A NOTE On the White Rodgers gas control valve thermostat the knob stop must first be slightly depressed before turning the gas control knob 4 Close the cold water inlet valve to the water heater and open a nearby hot water faucet 5 Connect a hose to the drain valve and terminate it to an adequate drain Open water heater drain valve by turning handle counterclockwise to drain water heater tank IMPORTANT DO NOT proceed to the following steps until the water heater is completely drained 6 On some water heaters the outer door may need to be removed 7 If control doesn t have a piezo ignitor skip to step 8 or disconnect the piezo ignitor wire from the piezo ignitor button NOTE There are two types of ignitors If you have the square ignitor slide the ignitor bracket backward away from the gas valve to remove it If you have a round ignitor first remove the ignitor from the bracket by depressing front and rear holding tabs and lift Next remove ignitor bracket from the gas valve Keep ignitor and bracket 8 Disconnect the thermocouple pilot tube and manifold burner tube Some control may have two wires flying
7. division of Emerson Electric Co The Emerson logo is a trademark and service mark of Emerson Electric Co www white rodgers com www emersonclimate com Rodgers EMERSON Climate Technologies
8. ent trap j burner To main burner To thermocouple Figure 1 Typical gas connection 3 If control had an ignitor transfer the ignitor and bracket removed from the old gas control valve to the new one 4 Reconnect manifold tube burner pilot tube ignitor wire if present flying leads if present Thermocouple nut thermocouple nut should be hand tightened and then turned an additional 14 turn with small wrench DO NOT OVERTIGHTEN Do not use pipe joint compound or TEFLON tape on manifold pilot and thermocouple connections 5 Reconnect union DO NOT use joint compound or TEFLON tape on union connection 6 Close the water heater drain valve by turning the handle to the right clockwise Open the cold water supply valve to the water heater to fill the water heater tank NOTE The cold water supply valve must be left open when the water heater is in use Keep the nearby hot water faucet open for 3 minutes after a constant flow of water is obtained to purge the lines of any excess air Check all new water piping for leaks Repair as needed Never use this water heater unless it is completely filled with water To prevent damage to the tank the tank must be filled with water Water must flow from the hot water faucet before turning ON gas to the water heater 7 Turn on gas shutoff valve DO NOT USE OPEN FLAME OR ANY KIND OF SPARK TO CHECK FOR LEAKS Serious injury of death from fire or explosion could result
9. leads attached to the thermal switch that must be disconnected as well 9 Disconnect the union joint in the gas piping Disconnect the remaining pipe from the gas control valve thermostat 10 Remove the control by turning it counterclockwise If needed a short piece of 2 black iron pipe can be screwed into the control inlet to increase leverage INSTALLING NEW CONTROL All piping must comply with local and state ordinances or with the National Fuel Gas Code ANSI Z223 1 NFPA 54 which ever applies Dirt or contamination in the gas line can block the control from operating creating a risk of explosion injury or death To protect the control from dirt contamination a drip leg or sediment trap see Figure 1 must be installed in the piping to the control 1 To replace the gas control valve thermostat reassemble in reverse order When replacing the gas valve use a short piece of pipe to help turn control Clockwise DO NOT OVER TIGHTEN or damage may result Use an approved pipe compound on the threads that screw into the tank and to the gas pipe that screw into the gas control valve thermostat Do not use TEFLON tape Do not apply compound to first two threads on gas pipe 2 Reconnect the gas piping to the gas control valve thermostat Use new black iron pipe that has been properly reamed If old pipe is used be sure it is clean and free from rust and scale Gas suppl pipe Gas shut off valve Drip leg sedim
10. o not detect gas continue with the next step Remove inner and outer burner doors located on the water heater under gas control unit Find pilot follow small metal tubes from gas control The pilot is located near the main burner See FIGURE D Turn gas control knob counterclockwise to PILOT See FIGURE B Depress control knob all the way and hold down Im mediately light the pilot with a match Continue to hold knob down for approximately one 1 minute after pilot is lit Release knob and it will pop back up Pilot should remain lit If pilot goes out repeat steps 2 3 6 and 7 e If knob does not pop up when released turn knob clockwise to OFF STOP and immediately call your service technician or gas supplier e Ifthe pilot will not stay lit after several tries turn gas control knob to OFF and call your service technician or gas supplier Replace inner and outer burner doors At arm s length away turn gas control knob counter clockwise to the full ON position FIGURE C Align the water temperature dial mark A with the temperature pointer on the cover This mark indicative of approximately 120 F is the preferred starting point If hotter water is desired see TEMPERATURE REGU LATION on page 4 Check for leaks at the pilot and main burner fittings on the gas control with the main burner firing Use a soapy water solution If a leak is detected turn the gas supply off and make repairs FIGURE D Gas
11. our gas company If you do not have a cannot turn the knob with hand pressure only the control detector and have the slightest suspicion that gas may be must be replaced present get out of the house and call the gas company DO 3 Do not use the control if the knob will not pop up after NOT RELY TOTALLY ON YOUR NOSE being depressed while the knob is in the PILOT position The mechanism is damaged and the control must be replaced Shut off gas to the water heater 4 For your safety this control is supplied with tamper resistant screws Do not attempt to repair or adjust the control If you experience problems replace the control immediately Continuing to use a damaged control could result in fire and or explosion An odorant has been added to the gas to help you detect it Before lighting search for the odor of gas by sniffing at floor level around the water heater Scald burns occur in under one second with 160 water which this thermostat will deliver if the temperature dial is set at VERY HOT Lower settings of the temperature dial will reduce the risk of scald and will reduce your fuel bill EMERSON Climate Technologies PART NO 37 7202A www white rodgers com www emersonclimate com 1036 INSTALLATION REPLACEMENT INFORMATION REMOVING OLD CONTROL 1 Turn off gas supply to the water heater at the manual gas shut off valve This valve is typically located beside the water heater 2 Locate the g
Download Pdf Manuals
Related Search