White Rodgers 21V51U-843 Installation Instructions
Contents
1. code Verify thermostat is energizing both Y and G on call for cool Check G terminal connections Low flame sense current is often caused by carbon deposits on the flame sensor a poorly grounded furnace or a mis aligned flame sense probe Carbon deposits can be cleaned with emery cloth Check for improve furnace and module ground Verify sensor is located in or very near flame as specified by the appliance manufacturer White y White Rodgers is a 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 r EMERSON2. of a call for heat and the 90 120 150 180 deactivation of the blower motor at Heat speed The period of time after a thermostat demand for cool before energizing the circulator blower motor at Cool speed The period of time between the loss of a call for cool and the deactivation of the blower motor at Cool speed After one 1 hour of internal or external lockout the control will automatically reset itself and go into an auto restart purge for 60 seconds These times will vary depending on option switch position MOUNTING AND WIRING All wiring should be installed according to local and national electrical codes and ordinances 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 F Any orientation is acceptable Refer to the wiring diagram and wiring table when connecting the 50V51 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 Referto 50V51 specification sheet for recommended terminals to mate with those on the control UL approved 105 C rated 16 gauge min stranded 4 64 thick insulation wire is recommended for all line voltage connections Refer to 50V51 specification sheet for recommended terminals to mate with those on the
3. UTION Do not short out terminals on gas valve or primary control Short or incorrect wiring may damage the thermostat CONTENTS Description Precautions Specifications Timing Table amp Definitions Installation Mounting amp Wiring Option Switch Settings Wiring Operation Troubleshooting EMERSON www white rodgers com www emersonclimate com DESCRIPTION Signals interpreted during continual surveillance of the two stage thermostat and flame sensing element initiate automatic ignition of the burner sensing of the flame and system shutoff during normal operation The control incorporates system fault analysis for quick gas flow shutoff coupled with automatic ignition retry upon sensing a fault correction PRECAUTIONS A WARNING hi Failure to comply with the following warnings could result in personal injury or property damage FIRE HAZARD e Do not exceed the specified voltage e Protect the control from direct contact with water dripping spraying rain etc If the control has been in direct contact with water replace the control Label all wires before disconnection when servic ing controls Wiring errors can cause improper and dangerous operation e Route and secure wiring away from flame SHOCK HAZARD e Disconnect electric power before servicing e Ensure proper earth grounding of appliance e Ensure proper connection of line neutral and line hot wires EXPLOSION HAZARD e Shut off mai
4. White y Rodgers 21V51U 843 Integrated Two Stage Variable Speed Motor Hot Surface Ignition Control Kit 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 kit Includes e 50V51 843 Ignition Control Module e 21D64 2 Ignitor Kit e Set of Interconnect Harnesses for Goodman The 50V51 843 is a two stage automatic gas interrupted igni tion control employing a microprocessor to continually monitor analyze and control the proper operation of the gas burner and inducer The 50V51 843 provides signals for proper operation of a variable fan speed circulator blower Installation should be done by a qualified heating and air con ditioning contractor or licensed electrician If in doubt about whether your wiring is millivolt line or low volt age 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 cause the control to malfunction Following installation or replacement follow manufacturer s recommended installation service instructions to ensure proper CA
5. ae 8 i Heat Fan Off Delay Timing DIP switches S7 3 and S7 4 see table above configure the number of seconds the blower will run after the call for heat ends Factory default is 90 seconds HEAT PUMP AND DE HUMIDIFICATION DIP Switches Heat Pump Installed Not Installed De humidifier 5 2 Installed On Not Installed Factory Settings Heat Pump Systems DIP switch S5 1 see table above is set to On from the factory for use with conventional non Heat Pump systems For heat pump systems move the S5 1 DIP switch to the Off position This will continuously output an O signal to the motor whenever there is Y signal and run the circulator blower ata constant speed when the pump is operating De Humidification Connection DIP switch S5 2 see table above is set to On from the factory for systems that do not have a dehumidification terminal con nection from the thermostat For systems using a thermostat that provides a De Humidification option move DIP switch S5 2 to Off WIRING The 50V51 843 has only one serviceable part an automotive cause of the control s problem replace the entire 50V51 843 type fuse which protects the low voltage transformer from dam control There are no other user serviceable parts age if the output is short circuited If the fuse has opened up Following installation or replacement follow appliance manu remove whatever caused the short circuit and replace t
6. ailure is internal to the control the RED indicator will stay on OPERATION Note If the module is configured for a single stage thermostat and running on second stage when the call for heat ends the circulator will drop to low speed after 30 seconds and continue until the heat off delay ends COOL MODE In a typical system a call for cool is initiated by closing Y and G This energizes the compressor and the electronic air cleaner optional The electronic air cleaner and the G and Y or Ylo outputs to the Circulator motor will energize after the 5 second cool on delay period After the thermostat is satisfied the compressor is de energized and the control starts a 60 second cool circulator speed off delay After 60 seconds the circulator is de energized MANUAL FAN ON MODE If the thermostat fan switch is moved to the ON position the electronic air cleaner optional and the G circulator output to the circulator motor will be energized When the fan switch is returned to the AUTO position the G circulator output and the electronic air cleaner are de energized TROUBLESHOOTING continuously In this case the entire control should be replaced as the control is not field repairable If the LED is continuously OFF there may be no power to the control or a failure within the control If the sensed failure is in the system external to the control the LED will flash RED in the sequence listed in the Diagnostic Table Th
7. bon deposits can be cleaned with emery cloth Verify sensor is not contacting the burner and is located in a good position to sense flame Check sensor lead for shorting and verify furnace is grounded properly Check items for exceeded retries listed above and verify valve is not dropping out allowing flame to be established and then lost Verify the control and furnace are properly grounded Check and reverse polarity primary if incorrect Verify valve is not receiving voltage from a short If a valve wiring is correct and condition persists replace module Possible blower failure restricted air flow through appliance or duct work Verify continuity through limit switch circuit and correct overheating Fault code indicates the module ignitor contacts are not functioning properly Replace module Module contacts for gas valve not operating or processor fault Reset control if condition persists replace module Check pressure switch function and tubing Verify inducer is turning on and pulling sufficient vacuum to engage switch Second stage call for heat on thermostat circuit with no call for first stage Verify DIP switches are set for two stage thermostat and check thermostat first stage circuit Configured for a multi stage thermostat the Module will not initiate heating unless first stage call from thermostat is received Module will allow cooling to operate with only a Y signal from the thermostat but will also trigger this
8. control GOODMAN NOTE FOR GOODMAN 50V51 289 APPLICATION THERE ARE TWO ADAPTER HARNESSES INCLUDED INTHIS PACKAGE TO COMPLETE THE INSTALLATION MOTOR OPTIMIZATION Amana Goodman Trane Lennox Thermo Pride The motor configuration DIP switches S3 and S4 must be set to match set tings of the original furnace settings for proper motor function To set the new board for the motor function the DIP switches must be set to match the settings of the board being replace IMPORTANT Be sure to use proper switches for new board settings Switch locations on old board may not be the same location as on the new board SW4 ON Existing 50V51 OFF Or 50V61 ON Switch Position al 50V51 843 OFF New Board N w A York The existing board has four shunt jumper banks to set motor function configuration The four jumper banks are des ignated DELAY E45 COOL E43 HEAT E46 ADJ E44 Each jumper bank has four pair of pins to have jumper installed to determine the type of voltage to the motor These pin pairs are A no signal B positive Half wave rectified C negative Half wave rectified D Full wave unrectified DELAY COOL HEAT ADJ o ohea OOla eune Cgi aTe Jumper Banks kS of Existing Board eJO sin Ofc O O A ide ga OO E44 ld E45 INSTALLATION The 50V51 843 has only one serviceable part an automotive type fuse which protects the low voltage transformer from dam age if the output i
9. ded to allow for the dissipation of any unburned 5 gas or residual products of combustion at the beginning of a furnace operating cycle prior to initiating ignition 7 0 The period of time between initiation of gas flow and the action to shut off the gas flow in the event of failure to establish proof of the supervised ignition source or the supervised main burner flame The period of time between energizing the main gas valve and deactivation of the ignition means prior to the end of TFI The additional attempts within the same thermostat cycle for ignition when the supervised main burner flame is not proven within the first trial for ignition period 3 The length of time allowed for the igniter to heat up prior to the initiation of gas flow Valve sequence period equals 4 seconds trial for ignition period x 1 initial try 2 retries 12 seconds The period of time intended to allow for the dissipation of any unburned gas or residual products of combustion between the failed trial for ignition and the retry period gas or residual products of combustion at the end of a furnace burner operating cycle Post purge begins at the loss of flame sense ANSI standard rated module timing 1 1 The period of time intended to allow for the dissipation of any unburned The period of time between proof of the supervised main burner flame 45 and the activation of the blower motor at Heat speed 0 5 The period of time between the loss
10. e CIRC N spade terminal circulator blower NEUTRAL side LINE N spade terminal input voltage 120 VAC NEUTRAL side XFMR N spade terminal 24 VAC transformer line voltage NEUTRAL side HUM N optional spade terminal humidifier NEUTRAL side EAC N optional spade terminal electronic air cleaner NEUTRAL side NOTE Spade terminals are 0 25 x 0 032 maximum recommended flame probe wire length is 36 inches NORMAL OPERATION HEAT ON When the thermostat calls for heat the module verifies the pressure switches are open and energizes the inducer high speed and optional humidifier contacts When the low pressure switch contacts close a 15 second pre purge begins After 15 seconds the inducer switches to low speed and the 120 VAC ignitor is energized The ignitor warms up for 17 seconds and the gas valve is energized on low fire Flame must be detected within 4 seconds If flame is detected a 45 second heat fan on time delay begins This allows the heat exchanger to warm up before energizing the circulator on low speed and optional Electronic Air Cleaner contact When the thermostat or module initiates second stage the inducer is energized at high speed This closes the second stage inducer pressure switch then energizes the second stage on the gas valve and then the high heat circulator speed NORMAL OPERATION HEAT OFF When the thermostat satisfies for second stage the control will switch high speed inducer and h
11. e LED will also indicate System Status as per the Amber and Green LED signatures listed in the Diagnostic Table The LED will flash one RED flash at power up CFM INDICATOR The LED DS2 CFM flashes when the blower motor is running The flashing indicates the motor CFM cubic feet per minute air flow designated by the furnace manufacturer Consult the furnace manufacturer for flash code detail FAULT CODE RETRIEVAL To retrieve fault codes push and release the LAST ERROR button for more than 1 5 second and less than 5 seconds Control will indicate this period by solid GREEN for 1 5 secs to 5 secs The LED will flash up to five stored fault codes beginning with the most recent If there are no fault codes in memory the LED will flash two green flashes The control will flash the most recent error first and the oldest error last last in first out There shall be 2 seconds between codes Solid LED error codes will not be displayed These error codes may be different from furnace label or furnace manual TRI COLOR DSI LED DIAGNOSTIC TABLE Error Condition Flame sensed when no flame should be present Comments Troubleshooting Verify the gas valve is operating and shutting down properly Flame in burner assemble should extinguish promptly at the end of the cycle Check orifices and gas pressure Pressure switch stuck closed inducer Pressure switch stuck closed Check switch function verify inducer error is
12. he fuse _facturer s recommended installation or service instructions to with only a 3 amp automotive type fuse If the fuse is not the insure proper operation 50V51 843 TYPICAL SYSTEM WIRING DIAGRAM HOT NEUTRAL LINE LINE 120 VAC 24 VAC CLASS Il TRANSFORMER 50V51 843 CIRC INTER CIRCULATOR FACE IGNITOR HUMIDIFIER OPTIONAL ELECTRONIC AIR CLEANER OPTIONAL CONDENSING UNITS p iii THIGH LIMIT RoLLour 1ST STAGE PRESSURE N C SWITCH N C SWITCH N 0 OO OO OO OO FLAME SENSOR LIMIT NC PROBE T 2ND STAGE PRESSURE SWITCH N O I l Pi Hisia 0000 Low Voltage 24 VAC Line Voltage 120 VAC Z N C Normally closed switch OLE N O Normally closed switch ae i 5 Pin Connector 12 Pin Connector WIRING 50V51 843 TYPICAL SYSTEM WIRING TABLE 50V51 843 TERMINAL SYSTEM COMPONENT TERMINAL TYPE CONNECTION two stage thermostat W1 terminal or equivalent two stage thermostat W2 terminal or equivalent two stage thermostat G terminal or equivalent 9 screw two stage thermostat R terminal or equivalent terminal two stage thermostat B C terminal or equivalent block two stage thermostat Y terminal or equivalent two stage thermostat Y2 terminal or equivalent humidistat enable OUTPUT to circulator H P or cooling mode OUTPUT to circulator MVH Pin 1 gas valve SECOND STAGE PS2 Pin 2 2nd stage pres
13. igh fire gas valve to low speed inducer and low fire gas valve After the 30 second high heat fan delay the circulator will drop to low speed When the thermostat satisfies for first stage the gas valve de energizes and the inducer will run low speed for a 15 second post purge The circulator runs until the heat off delay ends SYSTEM LOCKOUT When a system lockout occurs 1hour the gas valve is de energized the low speed inducer blower is energized for the 60 second interpurge period and the circulator is energized for selected heat off delay if it was previously ON The diagnostic indicator light will flash the fault that is present refer to diagnostic table To reset the control after system lockout do one of the following System Reset Remove 24 VAC power to the control for twenty 20 seconds or longer to reset the control Thermostat Reset Remove the call for heat from the thermostat for a period of between 1 second and less 20 seconds If flame is sensed with the gas valve de energized interrupting the call for heat at the thermostat will not reset the control Auto Restart After one 1 hour of internal or external lockout the control will automatically reset itself and go into an auto restart purge for 15 seconds DIAGNOSTIC FEATURES The control continuously monitors its own operation and the operation of the system If a failure occurs the diagnostic indicator LED DSI will flash a RED failure code If a f
14. n gas to appliance until installation is complete PART NO 37 7115C Replaces 37 7115B 1102 SPECIFICATIONS ELECTRICAL RATINGS 77 F 25 C Input Voltage 25 VAC 60 Hz Class II transformer required Max Input Current 25 VAC 500mA MV Relay Load Ratings Gas Valve Relays 1 5 amps 25 VAC 60 Hz Inducer Relays 2 2 FLA 3 5 LRA 120 VAC Ignitor Relay 4 0 amps 120 VAC Resistive Humidifier EAC 120 VAC 1 Amp Flame Current Requirements OPERATING TEMPERATURE RANGE 40 to 175 F 40 to 80 C HUMIDITY RANGE 5 to 93 relative humidity non condensing Timing Specs 60 Hz maximum Flame Establishing Time 0 8 sec Flame Failure Response Time 2 0 secs Gases Approved Natural Manufactured Mixed Liquefied Pe troleum and LP Gas Air Mixtures are all approved for use Minimum current to insure flame detection 0 3 pa DC Maximum current for non detection 0 1 ya DC Maximum allowable leakage resistance 100 M ohms Measured with a DC microammeter in the flame probe lead Pre purge Time Igniter Warm up Time Trial for Ignition Period TFI Ignition Activation Period IAP Retries Valve Sequence period Inter purge Post purge Time Lock Out Time Heat Delay To Fan On Heat Delay To Fan Off Cool Delay To Fan On Cool Delay To Fan Off Automatic Reset Time 21V51U 843 TIMING TABLE All times are in seconds unless noted otherwise 50M51 843 The period of time inten
15. s short circuited If the fuse has opened up remove whatever caused the short circuit and replace the fuse with only a 3 Amp automotive type fuse If the fuse does not correct the condition replace the entire 50V51 control There are not other user serviceable parts Following installation or replacement follow appliance manu facturer s recommended installation or service instructions to insure proper operation INSTALLER MUST READ FOR PROPER INSTALLATION e Wiring harnesses are included in this package to complete the installation of the UNIVERSAL 50V51 843 for Goodman applications e Installer must read Option Switch Settings section and set switches for proper control operation e For replacing the ignitor a UNIVERSAL 21D64 2 is included For proper installation refer to the instructions included in the 21D64 2 kit e IMPORTANT The installer may have to enlarge existing igni tor hole to accommodate 21D64 2 larger 394 diameter OPTION SWITCH SETTINGS On the new board the motor functions must be duplicated on DIP switched S3 and S4 per the following table Motor Configuration Settings A B Cc D T klea Half Wave Half Wave Wave sa o on OON sea orr or Lon on s o f on f oF on Delay Cool IR Lom Jon ow sss or on oF Pon Heat Psa o on ow ov por oe oF ow ssa Lore or on on SW4 sw3 ON on Switch Position 50V51 843 OFF OFF New Board 1 2 3 4 1 2 3 4 E
16. sure switch INPUT FP Pin 3 flame sensor probe GND Pin 4 MUST BE RELIABLY GROUNDED TO CHASSIS TH Pin 5 24 VAC transformer low voltage HIGH SIDE HLI Pin 6 a high limit INPUT MVL Pin 7 is gas valve FIRST STAGE MV COM Pin 8 gas valve COMMON TR Pin 9 24 VAC transformer low voltage COMMON SIDE GND 2 terminals Pin 10 MUST BE RELIABLY GROUNDED TO CHASSIS HLO Pin 11 high limit OUTPUT PS1 Pin 12 ist stage pressure switch INPUT IGN Pin 1 ignitor HOT side IND HI Pin 2 inducer HIGH SPEED HOT side IND LO Pin 3 i inducer LOW SPEED HOT side IND N Pin 4 inducer NEUTRAL side IGN N Pin 5 ignitor NEUTRAL side 24 VAC COMMON low heat speed select OUTPUT Circulator Blower 24 VAC COMMON Delay tap OUTPUT to circulator Cool tap OUTPUT to circulator YLO OUTPUT to circulator 16 pin adjust tap OUTPUT to circulator connector 24 VAC COMMON amp harness O OUTPUT to circulator Humidistat Y Y2 OUTPUT to Circulator Blower Heat tap OUTPUT to circulator 24 VAC OUTPUT to circulator W2 OUTPUT to circulator Y OUTPUT to circulator G YLo OUTPUT to Circulator Blower green CFM indicator CIRC spade terminal circulator blower HOT terminal LINE spade terminal input voltage 120 VAC HOT side XFMR spade terminal 24 VAC transformer line voltage HOT side EAC optional spade terminal electronic air cleaner HOT side HUM optional spade terminal humidifier HOT sid
17. turning off 3 1st stage pressure switch stuck open inducer error Check pressure switch function and tubing Verify inducer is turning on the pulling sufficient vacuum to engage switch Open limit switch Verify continuity through rollout switch circuit 5 Open rollout open fuse detect Verify continuity through rollout switch circuit check fuse 1st stage pressure switch cycle lockout External lockout retries exceeded External lockout ignition recycles exceeded where flame is established fe and then lost pa Grounding or Reversed polarity Module gas valve contacts energized with no call for heat Limit switch open possible blower failure overheating limit i LA Le Module Ignitor contact failure aE Module internal fault condition 3 double 2nd stage Pressure Switch Stuck Open Inducer Error 1 Normal Operation with call for first Normal operation first stage stage heat Normal Operation with call for second Normal operation first stage stage heat W2 present with no W1 Y present with no G call Low flame sense current If the first stage pressure switch cycles 5 times open closed during one call for heat from the thermostat the control will lockout Check pressure switch for fluttering inconsistent closure or poor vacuum pressure Failure to sense flame is often caused by carbon deposits on the flame sensor a disconnected or shorted flame sensor lead or a poorly grounded furnace Car
18. xample Settings OPTION SWITCH SETTINGS FURNACE MANUFACTURER DIP Switch Selection for OEM Applications OFF ON Thermo Pride Goodman ON OFF Lennox i ON ON Yok i IMPORTANT Switch selection must match furnace manu facturer for proper motor operation Set DIP switches S2 1 and S2 2 to match the equipment using the table above NOTE DIP switch S2 3 is not used THERMOSTAT TYPE AND HEAT FAN OFF DELAY DIP Switches __ Switch Settings Options Thermostat Type and W2 of of of Delay S7 1 On Off 10 Minutes S7 2 On On 20 Minutes 87 3 87 4 On Of 150 Secs on On 180 Secs Factory Settings Multi stage Thermostat Set up Factory Default DIP switches S7 1 and S7 2 see table above are set to the Off position from the factory for use with a multi stage ther mostat This allows the thermostat to control staging between low and high fire Single Stage Thermostat Set up Module Controls Staging DIP switches S7 1 and S7 2 see table above configure for a single stage thermostat Options include a 10 minute delay on second stage 20 minute delay on second stage or an Auto set ting allowing the module to calculate the time delay for second stage based on average demand The Average Calculated Duty Cycle table shows how the module calculates staging based on demand Average Calculated Duty Cycle Equals or is less Low to High than Stage Delay Demand
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