50D50-842 - eComfort
Contents
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3. Gap 0 1 0 2 15kV 25Hz Max cable length 3ft 0 9m Flame Current Requirements Minimum current to insure flame detection 2 uA Maximum current for non detection 0 2 DC Maximum allowable leakage resistance 100 M ohms Measured with a DC microammeter in series with the flame probe lead OPERATING TEMPERATURE RANGE 40 to 175 F 40 to 80 C HUMIDITY RANGE To 95 relative humidity non condensing MOUNTING Surface mount or 4 x 4 junction box GASES APPROVED Natural Manufactured Mixed Liquid Petroleum and LP Gas Air Mixtures INSTALLATION MOUNTING AND WIRING Do not use on circuits exceeding specified volt age Higher voltage will damage control and could cause shock or fire hazard To prevent electrical shock and or equipment damage disconnect electric power to system at main fuse or circuit breaker box until installation is complete Failure to earth ground the appliance or reversing the neutral and hot wire connection to the line can cause shock hazard Shut off main gas to heating system until instal lation is complete Route and secure all wiring as far from flame as practical to prevent fire and or equipment dam age Program Key Timing Specifications Quick Reference Timing and Retry PROGRAM TRIAL KEY FOR PRE INTER COLOR IGNITION RETRIES PURGE PURGE A blue 4 Sec 2 0 Sec 90 Sec B red 4 Sec 2 30 Sec 90 Sec C green 7 Se
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7. R ALTERNATE TRANSFORMER CONTROLLER LIMIT THERMOSTAT OR ALTERNATE TRANSFORMER CONTROLLER LIMIT Fig 2 Typical hookup for White Rodgers replacement Fig 3 Typical hookup for White Rodgers with separate flame sense and spark probes replacement with direct flame sense through single spark sense probe NOTE Max length of spark cable should be less than 3ft 0 9m and rated at 15kV The cable must not run in continuous contact with any metal surface or spark voltage is greatly reduced Use ceramic or plastic standoff insulators as required Ensure burner is grounded directly to module for spark return path INSTALL PROGRAM KEY The control replaces all listed models with the following features direct spark ignition remote rod flame sense or direct flame sense through ignitor one or three ignition tries four to eleven second trial for ignition time pre purge options zero or 30 seconds Eight program keys are provided for different applications Timings and Retries for each program key are shown in the Speci fications section on page 2 of this installation manual Choose the proper program key for the application Install the selected program key in the slot on the left side of the module see figure 1 and fit the timing label on the cover If the module you are replacing is not listed in the table contact the manufacturer of the appliance for a recommended replace ment or retrofit After inserting the proper progr
8. White Rodgers 50D50 842 Universal Direct Spark Control INSTALLATION INSTRUCTIONS FAILURE TO READ AND FOLLOW ALL INSTRUCTIONS CAREFULLY BEFORE INSTALLING OR OPERATING THIS CONTROL COULD CAUSE PERSONAL INJURY AND OR PROPERTY DAMAGE DESCRIPTION The 50D50 842 is a universal replacement Direct Spark control designed for maximum compatibility with existing systems It features A card port and eight program keys to select the Trial for Ignition Time Retries Prepurge and Recycle timings A Jumper to accommodate systems using Direct Sense sensing through ignitor or Indirect Sense using a Flame Sensor LED indicator for quick system and module diagnos tics and troubleshooting PRECAUTIONS J Y GENERAL PRECAUTION Application of this type of control may cause flame rollout on initial startup and could cause personal injury and or property damage Check product specification and cross reference before replacing existing module Do not use if existing module is not listed Use of a program key other than listed can result in appliance malfunction If in doubt about whether your wiring is millivolt line or low voltage have it inspected by a qualified heating and air conditioning contractor or licensed electrician Do not exceed the specification ratings All wiring must conform to local and national electrical codes and ordinances This control is a precision instrument and should be handled carefull
9. am key dispose of the remaining keys to ensure the correct key remains in the module If control fails to operate see troubleshooting guide for remedy TABLE 2 Cross Reference for Program Key and Wiring Instruction mm ev 1 www C gem Doe OPERATION TYPICAL FURNACE INSTALLATION In a typical application the 50D50 842 is designed to generate sparks and energize the gas valve and monitor the flame sen Sor It is a 100 shut off design that locks out the gas valve if the burner does not light within the trial for ignition period The ignition sequence begins with a call for heat from the room thermostat The thermostat applies power to the control After pre purge interval the valve is energized and sparks are generated for the selected trial for ignition time If the burner lights within the allowed period the gas valve will remain open until the call for heat is satisfied If the burner does not light the control will either go into lockout or make two more ignition retries depending on the options selected The control can be reset from lock out by cycling the thermostat to remove power for a minimum of 10 seconds It includes a system analysis troubleshooting LED that indicates normal operation lockout or control fault TROUBLESHOOTING For proper control operation the control must be electrically connected to the gas valve and all the ignition wiring connectors plugged in Gas valves with an electric ON OFF
10. c 2 0 Sec 90 Sec D violet 7 Sec 2 30 Sec 90 Sec E orange 7 Sec 0 0 Sec N A F yellow 7 Sec 0 30 Sec N A G blue wed 11 Sec 0 0 Sec N A H red green 11 Sec 0 30 Sec N A Program Key White a Rodgers WARMING MODEL 50D50 842 28 A eti Senn w M e Fig 1 Program Key installation Replace control as unit no user serviceable parts All wiring should be installed according to local and national electrical codes and ordinances The control may be mounted in any orientation on a con venient surface using two 6 x 5 8 sheet metal screws If desired control can be mounted on a 4 x 4 junction box using two 8 32 x 5 8 machine screws The control must be secured to an area that will experience a minimum of vibra tion and remain below the maximum ambient temperature rating of 175 F The control is approved for minimum ambient temperatures of 40 Refer to the wiring diagrams and wiring table when connect ing the control to other components of the system UL approved 105 C rated 18 gauge minimum wire is recom mended for all low voltage connections UL approved 105 C rated 16 gauge minimum wire is recommended for all line voltage connections After installation or replacement follow appliance manufac turer s recommended installation service instructions to insure proper operation INSTALLATION LIMIT CONTROLLER LIMIT CONTROLLER THERMOSTAT O
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16. switch must have the switch set to ON The light on the control provides a self diagnosis indication If the red light on the module is off continuously the fault is likely to be internal to the module To make sure interrupt the line or 24 volt thermostat power for 10 seconds check program key in stallation and then restore If the internal fault is indicated again and flame sensor is not shorted to ground replace the control A flashing light indicates a problem most likely in the external components or wiring see chart below Proceed as follows Visual checks 1 After the prepurge delay if applicable the valve opens and the ignition sparks starts 2 The burner flame will light 3 The ignition sparks stops Troubleshooting the system consists of checking for these visual indications The chart on the next page defines the proper ac tion if any of these indications does not occur LED Condition Solid On Normal Control ON One Flash False flame signal Two Flashes No Flame Detected Three Flashes Safety Drive Fault Four Flashes N A Five Flashes MV Drive Fault OFF No Power Internal Fault TROUBLESHOOTING Call for heat Thermostat contacts close Check low voltage to module TH TR If no voltage Check Limit Switches If correct voltage present Unit has internal fault replace Does the LED stay OFF Check flame probe and wiring Unit is seeing a flame signal with
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18. valve closed Check for poor burner ground wiring Check for partial shorting on flame probe wiring Does it give 1 Flash There is a fault in the internal safety relay drive Check supply voltage is within spec If itis replace control Does it give 3 Flashes There is an internal fault with the Main Valve relay Check for short between TH and MV If no external cause replace control Does it give 5 Flashes Check wiring to Valve if it does not operate After Pre purge replace Valve if voltage present Does Valve operate and Check spark wiring for shorts if no sparks sparks start Check sparks are at burner not to outer casing Ensure no breaks or cracks in insulation of spark lead Ensure pilot flame reaches flame sensor for detection Burner has failed to light after permitted attempts Check gas supply and pressure to valve Check sparks and wiring as above Does it give 2 Flashes Check limit switches Check sensor leads Check ground continuity Check flame remains on flame sensor Check gas jets are clear Check for clean burn Normal Operation White Rodgers is a division of Emerson Electric Co The Emerson logo is a trademark and service mark of Emerson Electric Co White y Rodgers www white rodgers com www emerson com EMERSON NOSUYAWS Woo uosiaws mMMM 09 91199 3 uosjeu3 ep ep eojeu eun A eroyeuJoo uloo9 sJeBpo J e1luM MMM eun se uosiu u3
19. y Rough handling or distorting compo nents could cause the control to malfunction CONTENTS Description Precautions Specifications Installation Mounting amp Wiring Operation amp Troubleshooting i te e dues A wan MODEL 50050 842 28 L 5 p aa vi 1 UR E P ESI s lil t AA t E e x 5 To prevent electrical shock and or equipment damage disconnect electric power to system at main fuse or circuit breaker box until installation is complete Label all wires prior to disconnection when ser vicing controls Wiring errors can cause improper and dangerous operation This control is not intended for use in locations where it may come in contact with water Suitable protection must be provided to shield the control from exposure to water dripping spraying rain Do not use on circuits exceeding specified volt age Higher voltage will damage control and could cause shock or fire hazard Donotshortoutterminals on gas valve or primary control to test Short or incorrect wiring will dam age thermostat and could cause personal injury and or property damage PART NO 37 6575E EMERSON www white rodgers com Replaces 37 6575D Climate Technologies www emerson com 0927 SPECIFICATIONS ELECTRICAL RATINGS Input Voltage 18 to 30 VAC 60 Hz Current 0 2 amp MV 25 C Relay Contact Ratings Main Valve Relay 1 5 amp Q 25 VAC 60 Hz Spark Output
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