White Rodgers 50E47 User's Manual
Contents
1. At the end of the ignitor warm up time both valves in the 36E manifold gas valve are opened The ignitor will remain on for an additional one second ignition activation period A four second ignition activation period is also available Flame must be detected within four seconds a seven second trial for ignition period is available as a separate type If flame is not detected both valves are de energized the ignitor is turned off and the 50E47 control goes into lockout If the control is locked out it may be reset by momentary power interruption of 2 second or longer Either the 24 volt thermostat or line voltage may be interrupted The 50E47 control may also be equipped with a retry option depending on the dash number see Timing Specifications table This provides a 60 second wait following an unsuccessful ignition attempt flame not detected If the prepurge option is used the waiting time becomes 90 seconds 30 second prepurge plus 60 sec ond wait After this wait the ignition sequence is restarted An additional 10 seconds is added to the ignitor warm up time so a module with a 17 second warm up time will have 27 seconds of ignitor warm up or a module with a 45 second warm up time will have 55 seconds of ignitor warm up If this ignition attempt is unsuccessful one more retry will be made before lockout All 50E47 controls will repeat the ignition sequence for a total of five recycles if flame is lost within the2. Maxi mum recommended wire length to the flame probe is 36 inches The GND terminal is a ground and return path for the flame sensor probe GND must be reliably connected to the burner chassis ground HOT NEUTRAL LINE VOLTAGE Transformer 24 VAC 60 Hz Class II Common C Thermostat Redundant Main Valve Valve BLACK WHITE Flame Sensor Probe Silicon Carbide Ignitor LINE VOLTAGE LOW VOLTAGE OPERATION TYPICAL FURNACE INSTALLATION In atypical system a call for heat is initiated by closing the thermostat contacts This will energize the 50E47 control If the system is equipped with prepurge the prepurge fan or interfacing relay is also energized through the thermo stat contacts Inthe prepurge mode the 50E47 control will delay 30 seconds before applying power to the 767A silicon carbide ignitor If prepurge is not an option the ignitor is powered within one second The ignitor is then allowed to warm up for 17 or 45 seconds depending on the 50E47 control dash number being used see Timing Specifications table Various ignitors on the market must use the 45 second option to allow them to fully attain ignition temperatures at low voltage condi tions The W R 15 second ignitor is especially designed to heat up quickly at a low voltage condition without overheating at a high voltage condition Thus the W R 15 second ignitor may also be used with a 45 second warm up time without detrimental effects
3. SLELO DS 4 2 NOTE All times are in nominal seconds at 60 Hz Multiply all timings by 120 at 50 Hz Reset time is 2 3 seconds max at power up On controls with retry option ignitor warm up time is increased by 10 seconds on retry 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 appli ance or reversing the neutral and hot wire con nection 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 damage NOTE Replace 50E47 control as a unit no user serviceable parts All wiring should be installed according to local and national electrical codes and ordinances The 50E47 control may be mounted on any convenient surface using two 6 x 5 8 sheet metal screws If desired itis designed to 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 experi ence a minimum of vibration and remain below the maxi mum ambient temperature rating of 175 F The control is approved for minimum ambient temperatures of 40 F Any orientatio
4. VAC 50 60 Hz resistive Flame Current Requirements Minimum current to insure flame detection 2 ua DC Maximum current for non detection 0 2 wa DC Maximum allowable leakage resistance 100 M ohms Measured with a DC microammeter in 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 Timing Specs see table below for variable timings maximum 60 Hz 50 Hz Flame Establishing Time Standard 4 00sec 4 8 sec Optional 7 0 sec 8 4 sec Flame failure Response time 0 8 sec 0 96 sec Recycle Time Immediate or equal to prepurge time on models with prepurge option Gases Approved Natural Manufactured Mixed Liquid Petroleum and LP Gas Air Mixtures are all approved for use TIMING SPECIFICATIONS all times in seconds unles otherwise noted Ignitor are 0 17 Er ee 0o 4 amp 5 4 Trial for Ignition Warmup Ignition Activation Sequence Dash Number Pre purge Period Period Period Period poog a Paes ee 230 30 2802 ss a 0 fs 10s 30 30 3 303 2 30 30 30 30 30 30 30 30 30 30 30 ree o mN NIANIA INI N a NIANIA NIAN InN w w Alo ON 4 amp Oo A J RJ A AR oa NOTIN JOT N JOlIN 45 Valve Lockout Interpurge Time Oo o 4 0o gt ol l i e 4 4 N N Ko a gt z k N
5. WHITE RODGERS 50E47 Hot Surface Ignition Control 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 The White Rodgers 50E47 is an automatic gas inter rupted ignition control employing a microprocessor to continually monitor analyze and control the proper op eration of the gas burner Signals interpreted during continual surveillance of the thermostat and flame sensing element initiate automatic ignition of the burner sensing of the flame and system shut off during normal operation System fault analysis which quickly shuts off the gas flow coupled with automatic re ignition upon sensing a fault correction highlight the control s capabilities GENERAL PRECAUTION Application of this type of control may cause flame rollout on initial startup and could cause personal injury and or property damage Replace only with exact model number includ ing dash number Failure to use exact replace ment control could cause personal injury and or property damage 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 o
6. first 10 seconds of establishment If flame is established for more than 10 seconds after ignition the 50E47 controller will clear the ignition attempt retry counter If flame is lost after 10 seconds it will restart the ignition sequence This can occur a maximum of five times During burner operation a momentary loss of power of 50 milliseconds or longer will de energize the main gas valve When power is restored the gas valve will remain de energized and a restart of the ignition sequence will begin immediately A momentary loss of gas supply flame blowout or a shorted or open condition in the flame probe circuit will be sensed within 0 8 seconds The gas valve will de ener gize and the control will restart the ignition sequence after waiting 60 seconds Recycles will begin and the burner will operate normally if the gas supply returns or the fault condition is corrected before the last ignition attempt Otherwise the control will go into system lockout If you need further information about this product please write to White Rodgers Division Emerson Electric Co 9797 Reavis Road St Louis MO 63123 5398 Attention Technical Service Department
7. n is acceptable Refer to the wiring diagram and wiring table when con necting the 50E47 control to other components of the system UL approved 105 C rated 18 gauge min stranded 2 64 thick insulation wire is recommended for all low voltage safety circuit connections Refer to 50E47 specification sheet for recommended terminals to mate with those on the control UL approved 105 C rated 16 gauge min stranded 4 thick insulation wire is recommended for all line voltage connections Refer to 50 47 specification sheet for rec ommended terminals to mate with those on the control Following installation or replacement follow appliance manufacturer s recommendedinstallation service instruc tions to insure proper operation INSTALLATION WIRING The two terminals identified as MV connect to the 36E model gas valve Both solenoids in the valve will be in parallel across these two terminals The TH terminal must be connected to the switched 24 volt wire from the thermostat TH is the same as the W terminal on most low voltage thermostat systems The TR terminal is connected to the 24 volt transformer return TR may be grounded either at the transformer or by aground wire extended from the terminal TR TR is the same as the C terminal on most low voltage thermostat systems The L1 terminal and IGN terminal are connected with a two terminal connector on the ignitor leads The FP terminal is connected to the flame probe
8. rdinances This control is a precision instrument and should be handled carefully Rough handling or distorting compo nents could cause the control to malfunction CONTENTS Description Precautions Specifications Installation Mounting amp Wiring Operation WHITE RODGERS DIVISION DESCRIPTION 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 im proper and dangerous operation This control is not intended for use in locations where it may come in contact with water Suit able protection must be provided to shield the control from exposure to water dripping spray ing rain etc Do not use on circuits exceeding specified volt age Higher voltage will damage control and could cause shock or fire hazard Do not short out terminals on gas valve or pri mary control to test Short or incorrect wiring will damage thermostat and could cause personal injury and or property damage ho i EMERSON ELECTRIC CO PART NO 37 4836B WM 9797 REAVIS ROAD Printed in U S A Replaces 37 4836A minson ST LOUIS MISSOURI 63123 5398 9541 SPECIFICATIONS ELECTRICAL RATINGS Input Voltage 25 VAC 50 60 Hz Current 0 2 amp Relay Contact Ratings Valve Relay 1 5 amp 25 VAC 50 60 Hz 0 6 pf Ignitor Relay 6 0 amp 120
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