White Rodgers 50D50-843 Installation Instructions
Contents
1. amp 25 VAC 60 Hz Spark Output Gap 0 1 0 2 15kV 25Hz Max cable length 3ft 0 9m Flame Current Requirements Minimum current to insure flame detection 2 uA DC Maximum current for non detection 0 2 uA 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 installation is complete Route and secure all wiring as far from flame as practical to prevent fire and or equipment damage Program Key Timing Specifications Quick Reference Timing and Retry PROGRAM PRE KEY PURGE RESET SAFETY COLOR TIME TIME RETRIES TIME A blue 0 Sec 300 Sec Continuous 90 S2. White Rodgers 50D50 843 Universal Proven Pilot 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 The 50D50 843 is a universal replacement Spark control designed for maximum compatibility with existing systems It features Acard port and ten program keys to select the Safety Time Retries Pre purge and Recycle timings e A Jumper to accommodate systems using Direct Sense sensing through ignitor or Indirect Sense using a Flame Sensor e LED indicator for quick system and module diagnostics and troubleshooting 7N 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 carefully Rough handling or distorting components could
3. cause the control to malfunction CONTENTS Description Precautions Specifications Installation Mounting amp Wiring Operation amp Troubleshooting 4 4 S EMERSON www white rodgers com www emersonclimate com DESCRIPTION White eo a E Rodgers E MODEL 50050 843 SA A op HR v A E at 3 i E ABRRERROED a2 oe oe 5A mem L2 e a 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 servicing 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 etc Donotuse on circuits exceeding specified voltage Higher voltage will damage control and could cause shock or fire hazard Do not short out terminals on gas valve or primary control to test Short or incorrect wiring will damage thermostat and could cause personal injury and or property damage PART NO 37 6576H Replaces 37 6576G 1423 SPECIFICATIONS ELECTRICAL RATINGS Input Voltage 18 to 30 VAC 60 Hz Current 0 2 amp MV PV 25 C Relay Contact Ratings Pilot Valve Relay 1 5 amp 25 VAC 60 Hz Main Valve Relay 1 5
4. e burner does not light the control will either continuously retry after the reset time or make two more ignition retries depending on the options selected The control can be reset from lockout 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 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 installation 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 the problem is most likely in the external components or wiring see chart below Proceed as follows Visual checks 1 After the purge delay if applicable the pilot valve opens and the ignition sparks starts 2 The pilot burner flame will light 3 The ignition sparks stops and the main valve opens 4 The main burner flame will ignite Troubleshooting the system consists of checking for these visual indications The chart on th
5. e connections After installation or replacement follow appliance manufacturer s recommended installation service instructions to insure proper operation INSTALLATION ALTERNATE TRANSFORMER THERMOSTAT OR ALTERNATE TRANSFORMER THERMOSTAT OR CONTROLLER LIMIT CONTROLLER LIMIT Fig 2 Typical hookup for White Rodgers replacement with Fig 3 Typical hookup for White Rodgers replacement with separate flame sense and spark probes direct flame sense throughsingle spark sense probe THERMOSTAT OR ALTERNATE TRANSFORMER THERMOSTAT OR ALTERNATE TRANSFORMER CONTROLLER LIMIT CONTROLLER LIMIT Fig 4 Typical hookup for White Rodgers replacement with Fig 5 Typical hookup for White Rodgers replacement with vent vent damper and separate flame sense and spark probes damper and direct flame sense through single spark sense probe 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 If flame sense lead connector is too small for the new module cut it off and replace with enclosed 1 4 female connector INSTALL PROGRAM KEY The control replaces all listed models with the following features e proven pilot spark ignition e remote rod flame sense or direct flame sense through ig
6. e next page defines the proper action 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 PV Drive Fault Five Flashes MV Drive Fault OFF No Power Internal Fault Call for heat Thermostat contacts close Check low voltage to module TH TR YES If no voltage Check Limit Switches Does the LED oo Check that vent damper operates if fitted stay OFF TH is only powered when vent is fully opened If correct voltage present Unit has internal fault replace Check flame probe and wiring Unit is seeing a flame signal with 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 it is replace control Does it give 3 Flashes There is an internal fault with the Pilot Valve relay Check for short between TH and PV If no external cause replace control Does it give 4 Flashes NO 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 PV if it does not operate replace PV if voltage prese
7. ec B red 30 Sec 300 Sec Continuous 90 Sec C green 0 Sec 300 Sec Continuous 30 Sec D violet 30 Sec 300 Sec Continuous 30 Sec E orange 0 Sec 300 Sec 2 60 Sec F yellow 30 Sec 300 Sec 2 60 Sec G blue red 0 Sec 300 Sec Continuous 15 Sec H red green 30 Sec N A N A Continuous green orange 0 Sec 300 Sec Continuous 4 Sec J violet blue 30 Sec 300 Sec Continuous 4 Sec Program Key E _ Whitey a gt Rodgers p2 MODEL 50D50 J P ETE Ta ARRHNMMONO MOME 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 convenient 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 vibration 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 connecting the control to other components of the system UL approved 105 C rated 18 gauge minimum wire is recommended for all low voltage connections UL approved 105 C rated 16 gauge minimum wire is recommended for all line voltag
8. nitor e three or more ignition tries e four to ninety second safety time e pre purge of 30 seconds or less Ten program keys are provided for different applications Timings and Retries for each program key are shown in the Specifi cations 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 replacement or retrofit After inserting the proper program 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 OPERATION TYPICAL FURNACE INSTALLATION In a typical application the 50D50 843 is designed to generate sparks and energize the gas valves and monitor the flame sensor It is a 100 shut off design that locks out the gas valve if the burner does not light within the safety time 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 pilot valve is energized and sparks are generated for the selected safety time If the burner lights within the allowed period the pilot gas valve will remain open and the main valve will be energized until the call for heat is satisfied If th
9. nt Check spark wiring for shorts if no sparks 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 it give 2 Flashes No Does i NO Check limit switches Check sensor leads Check ground continuity system run urii call for Check pilot flame remains on flame sensor when main burner lights eat ends Check gas jets are clear Check for clean burn 4 YES Normal Operation White Rodgers is a business Wh ite Rodgers of Emerson Electric Co S The Emerson logo is a trademark and service mark www white rodgers com EM E RSO N of Emerson Electric Co www emersonclimate com I nc
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