White Rodgers 50A65-5165 Installation Instructions
Contents
1. TYPICAL SYSTEM WIRING TABLE 50A65 5165 TERMINAL SYSTEM COMPONENT TERMINAL TYPE CONNECTION Terminal block with captive screws OeO e20e low voltage thermostat W terminal or equivalent low voltage thermostat G terminal or equivalent low voltage thermostat R terminal or equivalent low voltage thermostat Y terminal or equivalent 2nd wire from Y terminal goes to 24 VAC HOT side of compressor contactor coil 24 VAC COMMON side of compressor contactor coil one wire twinning terminal high limit OUTPUT flame sensor probet 24 VAC transformer low voltage HIGH side not used not used 24 VAC transformer low voltage COMMON side high limit INPUT MUST BE RELIABLY GROUNDED TO CHASSIS gas valve COMMON pressure switch INPUT not used gas valve inducer HOT side ignitor HOT side inducer NEUTRAL side ignitor NEUTRAL side circulator blower COOL SPEED terminal H PARK 2 terminals spade terminal unused circulator blower terminals XFMR 24 VAC transformer line voltage HOT side OOL circulator blower HEAT SPEED terminal LINE input voltage 120 VAC HOT side HUM optional humidifier HOT side EAC optional electronic air cleaner HOT side CIR N circulator blower NEUTRAL terminal XFMR N 24 VAC transformer line voltage NEUTRAL side LINE N input voltage 120 VAC NEUTRAL side HUM N optional humidifier NEUTRAL side EAC N optional electronic air cleaner NEUTRAL side The twinning2. 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 TROUBLESHOOTING Red LED Flash Error Condition Comments Troubleshooting Slow Flash Normal operation Normal no Call for Heat Fast Flash Normal operation Normal Call for Heat External lockout exceeded retries 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 Carbon 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 Verify gas supply to valve gas valve in On position and appliance lighting properly Verify flame reaches flame sensor during ignition attempts and gas pressures are correct 3 Pressure switch problem vent on Inducer Check switch function verify inducer is working correctly Refer problem to wiring diagram terminals PS 4 Open high temperature limit switch Verify continuity through limit switch circuit Refer to wiring diagram terminals HLO 5 Flame sensed with gas valve de energized Verify the gas valve is operating and shutting down properly Flame in burner assembly should extinguish promptly at the end of the cycle Check orifices and gas pressure
3. resistive Flame Current Requirements Minimum current to insure flame detection 1 ya DC Maximum current for non detection 0 1 pa DC Maximum allowable leakage resistance 100 M ohms Measured witha DC microammeter in the flame probe lead OPERATING TEMPERATURE RANGE 40 to 175 F 40 to 80 C HUMIDITY RANGE 5 to 93 relative humidity non condensing MOUNTING Surface mount multipoise Timing Specs 60 Hz maximum Flame Establishing Time 0 8 sec Flame Failure Response Time 2 0 sec At 50 Hz all timing specifications should be increased by 20 Gases Approved Natural Manufactured Mixed Liquified Petroleum and LP Gas Air Mixtures are all approved for use INSTALLATION MOUNTING AND WIRING Allwiring 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 50A65 control to other components of the system ULapproved 105 C rated 18 gauge stranded 2 64 thick insulation wire is recommended for all low voltage safety circuit connections Refer to 50A65 specification sheet for recommended terminals to mate with those on the control UL approved 105 C rated 16 gau
4. retry sequence The retry sequence provides a 60 second wait following an unsuccessful ignition attempt flame not detected After this wait the ignition sequence is restarted again If this ignition attempt is unsuccessful one more retry will be made before the control goes into system lockout If flame is detected then lost the 50A65 control will repeat the initial ignition sequence for a total of ten recycles After ten unsuccessful recycle attempts the control will go into system lockout If flame is established for more than 10 seconds after ignition the 50A65 controller will clear the ignition attempt or retry counter If flame is lost after 10 seconds it will restart the ignition sequence This can occur a maximum of 11 times before system lockout A momentary loss of gas supply flame blowout or a shorted or open condition in the flame probe circuit will be sensed within 2 0 seconds The gas valve will de energize and the control will restart the ignition sequence A recycle 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 the control has gone into system lockout it may be possible to reset the control by a momentary power interruption of ten seconds or longer Refer to SYSTEM LOCKOUT FEATURES OPERATION COOL MODE In atypical system a call f
5. feature is available only on models with six screw terminals one of these terminals will be designated TWIN All 50A65 475 50A65 476 and 50A65 5165 controls used in twinning applications must have the TWIN terminal t Maximum recommended flame probe wire length is 36 inches 4 OPTION SWITCHES The option switches on the 50A65 5165 control are used to determine the length of the heat delay to fan off periods and cool delay to fan off period The following tables shows the time periods that will result from the various switch positions OPTION SWITCH POSITIONS COOL delay to fan off 0 sec EEE 80 sec to fan off 2 3 60 sec 100 sec 140 sec 180 sec Factory setting HEAT MODE In a typical system a call for heat is initiated by closing the thermostat contacts This starts the 50A65 control s heating sequence The inducer blower and optional humidifier are energized and the 768A silicon nitride ignitor is powered within one second This control has an adaptive algorithm that reduces the ignitor temperature to slightly greater than the minimum temperature required to ignite gas in each particular application The control measures the line voltage and determines an initial ignitor temperature setting based on the measurement After each successful ignition the control lowers the ignitor temperature slightly for the next ignition attempt The control continues to lower the ignitor temperatu
6. 50A65 5165 White Rodgers Integrated Furnace 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 50A65 5165 is an automatic gas interrupted ignition control that employs a microprocessor to continually monitor analyze and control the proper operation of the gas burner inducer and fan 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 These controls incorporates system fault analysis for quick gas flow shut off coupled with automatic ignition retry upon sensing a fault correction It is designed as a replacement for the following controls Trane White Rodgers CNT05164 50A65 475 CNT05165 50A65 476 50A65 5165 PRECAUTIONS Installation should be done by a qualified heating and A WARNING air conditioning contractor or licensed electrician Failure to comply with the following warnings could result in personal injury or property damage FIRE HAZARD e Do not exceed the specified voltage f f e Replace existing control with exact model and All wiring must conform to local and national electrical dash number codes and ordinances Protectthe control from direct contact with water This control is a p
7. 6 Reversed polarity Verify the control and furnace are properly grounded Check and reverse polarity primary or secondary if incorrect 7 Gas valve circuit error Indicates the gas valve relay contacts on the ignition module is not functioning properly Replace the ignition module 8 Low flame sense current 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 or improve furnace and module ground Verify sensor is located in or very near flame as specified by the appliance manufacturer Refer to wiring diagram FS terminal and GND 9 Ignition fault Check ignitor or improper grounding hae Control failure Replace IFC Off Control failure Verify power to the control TECHNICAL SUPPORT 1 888 725 9797 White Rodgers is a business K of Emerson Electric Co White Rodgers S The Emerson logo is a A trademark and service mark www white rodgers com E M ERSO N of Emerson Electric Co www emersonclimate com
8. call for heat the LED will flash quickly one flash per half second If a failure occurs the LED will indicate a failure code as shown in Troubleshooting section If the failure is internal to the control the light will stay on 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 the fuse on the control may be open or there may be a failure in the control If the sensed failure is in the system external to the control the LED will flash in the following flash pause sequences to indicate failure status each flash will last approximately 0 25 seconds and each pause will last approximately 2 seconds OPERATION DEFINITION OF TERMS 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 60 seconds Cool Delay To Fan Off The period of time between the loss of a call for cool and the deactivation of the blower motor at Cool speed Cool Delay To Fan On The period of time after a thermostat demand for cool before energizing the circulator blower motor at Cool speed Flame Failure Response Time FFRT The period of time between loss of the supervised main burner flame and the action to shut off the gas supply Heat Delay To Fan Off The period of time between the loss of a call for heat and the deactivati
9. fore 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 main gas to appliance until installation is complete WIRING TYPICAL SYSTEM WIRING DIAGRAM HOT NEUTRAL LINE LINE 120 VAC 24 VAC CLASS II TRANSFORMER TH 24 VAC 50A65 5165 INDUCER ELECTRONIC AIR CLEANER COMPRESSOR CONTACTOR 50A65 475 or 50A65 476 in other furnace s TWINNING THERMOSTAT APPLICATIONS ONLY TWIN HIGH LIMIT AUX HIGH N C LIMIT N C FLAME SENSOR PRESSURE SWITCH N O The twinning feature is available only on models with six screw terminals Low Voltage 24 VAC one of these terminals will be Line Voltage 120 VAC designated TWIN All 50A65 475 N C Normally closed switch BORGS 170 and 90A69 5199 controls used in twinning applications must U N O Normally open switch have the TWIN terminal 4 Pin Connector 12 Pin Connector WIRING G R C W TWIN HLO Pin 1 FP Pin 2 TH Pin 3 Pin 4 Pin 5 TR Pin 6 HLI Pin 7 GND Pin 8 MV COM Pin 9 PS Pin 10 Pin 11 MV Pin 12 IND Pin 1 IGN Pin 2 IND N Pin 3 IGN N Pin 4
10. ge min stranded 4 64 thick insulation wire is recommended for all line voltage connections Refer to 50A65 specification sheet for recommended terminals to mate with those on the control The 50A65 has only one serviceable part an automotive type fuse which protects the low voltage transformer from damage if its output is short circuited If the fuse has opened up remove whatever caused the short circuit and replace the fuse with only a 5 Amp automotive type fuse If the fuse is not the cause of the control s problem replace the entire 50A65 control There are no other user serviceable parts 2 TIMING SPECIFICATIONS All times are in seconds unless noted otherwise 50A65 5165 Pre Purge 0 Interpurge Heat Delay To Fan Off 60 100 140 180_ These times will vary depending on option switch position The control is factory set at 80 sec cool delay to fan off and 180 sec heat delay to fan off See OPERATION section for further information 2 3 4 60 100 140 180 Ye Ye A CAUTION Do notshort outterminals on gas valve or primary control Short or incorrect wiring may damage the thermostat A WARNING FIRE HAZARD e Do not exceed the specified voltage e Replace existing control with exact model and dash number 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 be
11. on of the blower motor at Heat speed Heat Delay To Fan On The period of time between proof of the supervised main burner flame and the activation of the blower motor at Heat speed Igniter Warm up Time The length of time allowed for the igniter to heat up prior to the initiation of gas flow Ignition Activation Period IAP The period of time between energizing the main gas valve and deactivation of the ignition means prior to the end of TFI Inter purge 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 Post purge Time The period of time intended to allow for the dissipation of any unburned gas or residual products of combustion at the end of a furnace burner operating cycle Post purge begins at the loss of flame sense Pre purge Time The period of time intended to allow for the dissipation of any unburned gas or residual products of combustion at the beginning of a furnace operating cycle prior to initiating ignition Recycles The additional attempts within the same thermostat cycle for ignition after loss of the supervised ignition source or the supervised main burner flame Retries 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 Trial for Ignition Period TFI
12. or cool is initiated by closing the thermostat contacts This energizes the 50A65 control and the compressor The cool delay to fan on period begins After the delay period ends the optional electronic air cleaner is energized and the circulator fan is energized at cool speed After the thermostat is satisfied the compressor is de energized and the optional cool mode delay to fan off period begins After the optional delay to fan off period ends the circulator fan and electronic air cleaner optional are de energized MANUAL FAN ON MODE If the thermostat fan switch is moved to the ON position the circulator fan heat speed and optional electronic air cleaner are energized When the fan switch is returned to the AUTO position the circulator fan and electronic air cleaner optional are de energized TWINNING INTERFACE If the control has six screw terminals one of which is designated TWIN the control is equipped with a single wire twinning interface If twinning is used either control will process a call for heat cool or fan as described above However after the heat cool or fan on delay time expires both units will energize the circulator blowers at the same time Likewise after the heat cool or fan off delay time expires both units will de energize the circulator blowers at the same time This allows for proper air flow to be obtained To assure proper control operation both controls must share a common transforme
13. r ground TR To enable twinning do the following 1 Power supplied to both furnaces must be from the same phase of the incoming 120 VAC power 2 Connect the TWIN screw terminals on the 50A65 475 50A65 476 or 50A65 5165 of the furnaces to be twinned to each other using a single wire 14 22 AWG SYSTEM LOCKOUT AND DIAGNOSTIC FEATURES SYSTEM LOCKOUT FEATURES When system lockout occurs the gas valve is de energized the circulator blower is energized at heat speed and if flame is sensed the inducer blower is energized The diagnostic indicator light will flash or glow continuously to indicate system status System lockout will never override any precautionary features To reset the control after system lockout do one of the following 1 Interrupt the call for heat or cool at the thermostat for at least one second but less than 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 2 Interrupt the 24 VAC power at the control for at least ten seconds You may also need to reset the flame rollout sensor switch 3 After one hour in lockout the control will automatically reset itself DIAGNOSTIC FEATURES The 50A65 5165 control continuously monitors its own operation and the operation of the system The LED light on the control will flash slowly one flash per second if there are no failures and no call for heat If there is a
14. re until ignition does not occur and the control goes into retry mode For the second attempt to ignite gas within the same call for heat the control increases the ignitor temperature to the value it was on the fourth previous successful ignition After ignition is successful the control sets the ignition temperature at this value The 80 VAC Silicon Nitride ignitor manufactured by White Rodgers must be used These ignitors are OPERATION specially designed to operate with the 50A65 s adaptive ignition routine to ensure the most efficient ignitor temperature At the end of the ignitor warm up time both valves in the 36E manifold gas valve are opened Flame must be detected within 4 seconds If flame is detected the delay to fan on period begins After the delay to fan on period ends the circulator fan is energized at heat speed If there is an optional electronic air cleaner on the system the electronic air cleaner is also energized When the thermostat is satisfied the gas valve is de energized After proof of flame loss the delay to fan off period begins and the inducer blower remains energized to purge the system for 5 seconds When the purge is complete the inducer blower and humidifier are de energized After the delay to fan off period ends the circulator fan and electronic air cleaner are de energized If flame is not detected both valves are de energized the ignitor is turned off and the 50A65 control goes into the
15. recision instrument and should dripping spraying rain etc be handled carefully Rough handling or distorting If the control has been in direct contact with water replace the control components could cause the control to 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 Label all wires before disconnection when Following installation or replacement follow servicing controls Wiring errors can cause manufacturer s recommended installation service improper and dangerous operation instructions to ensure proper 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 main gas to appliance until installation is complete A CAUTION Do notshort outterminals on gas valve or primary control Short or incorrect wiring may damage the thermostat PART NO 37 7516A EMERSON www white rodgers com www emersonclimate com 1409 SPECIFICATIONS ELECTRICAL RATINGS 77 F 25 C Input Voltage 25 VAC 50 60 Hz Max Input Current 25 VAC 0 45 amp Relay Load Ratings Valve Relay 1 5 amp 25 VAC 50 60 Hz 0 6 pf Ignitor Relay 2 0 amp 120 VAC 50 60 Hz
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