York DM036 Installation Manual

Also see for DM 036: Technical guide

Contents

York DM036 Installation Manual Manual pdf 49 page image

5011492-XIM-B-0815Johnson Controls Unitary Products 49motor is at fault. On 575 volt models, if voltage is present atthe terminal, then check the draft motor relay (DMR onsingle stage gas heat and DMR-2 on two stage gas heat)mounted above the ICB. First verify that the relay is pulledin by visual inspection. If not, then verify the minimumvoltage is present between terminals “A” and “B” of therelay. If the minimum voltage is not present, then check thewiring. If it is present, then verify that a minimum of 150volts is present at terminals “5” and “7” of the draft motorrelay. If not present at terminal “7” of the draft motor relay,then troubleshoot the transformer in blower section and itswiring. If present at terminal “7” and not at terminal “5” ofthe draft motor relay, then the relay is at fault. If theminimum voltage is present at terminal 5 of the draft motorrelay, then the draft motor is at fault.The ignitor sparks at the pilot burner but the pilot does not igniteand a gas odor is detected at the draft motor outlet.1. Adjust the pilot adjust screw on the gas valve as describedin “PILOT CHECKOUT” on page 42.2. Check the supply pressure as described in “POST STARTCHECK LIST” on page 41. Make adjustments asnecessary.3. Check the pilot orifice and pilot burner for obstruction asdescribed in paragraph above. Clean as needed but theproblem should not be the gas valve.The pilot burner ignites but the ignitor continues to spark andthe main burners do not ignite.1. Make the same checks and adjustment as described in“PILOT CHECKOUT” on page 42.2. Check the supply pressure as described in “POST STARTCHECK LIST” on page page 41. Make adjustments asnecessary.3. Make sure that the pilot burner is not bent or damaged.4. Make sure that the ground connections at the pilot burner,gas valve and ignition control are intact. Check the ignitorwire for good electrical connection. If all are intact, replacethe ignition control.The pilot burner lights and the spark stops but the main burnersdo not light.1. Check electrical connections between the ignition controland the gas valve. If intact, check for 24 volts acrossterminals “MV” and “GROUND” terminals. If no voltagedetected, replace ignition control. If voltage is present,replace gas valve.Main burners light but exhibit erratic flame characteristics.1. Adjust air shutters as described in “BURNER AIRSHUTTER ADJUSTMENT” on page 42.2. Check the main burner orifices for obstruction andalignment. Removal procedure is described in BURNERINSTRUCTIONS on page 42. Clean or replace burnerorifices and burners as needed.Unit Flash CodesVarious flash codes are utilized by the unit control board (UCB)and the ignition control board (ICB) to aid in troubleshooting.Flash codes are distinguished by the short on and off cycleused (approximately 200ms on and 200ms off). To show normaloperation, the control boards flashes a 1 second on, 1 secondoff “heartbeat” during normal operation. This is to verify that theUCB and the ICB are functioning correctly. Do not confuse thiswith an error flash code. To prevent confusion, a 1-flash, flashcode is not used.Current alarms or active restrictions are flashed on the UCBLED.• LAST ERROR - When this button is pressed and releasedone time within five seconds, it flashes the last five flashcodes on the board’s LED. The most recent alarm isshown first and the oldest alarm is shown last.When pressed and released twice within a five secondspan, the fault history is cleared.• TEST RESET - When this button is pressed and releasedone time within five seconds, any anti-short cycle delays(ASCD) is by-passed for one cycle.When this button is pressed twice within five seconds, anyactive lockouts are reset.• COMM SET UP - If the board is to be networked withother units, this button is used to set the network address.The first time the button is pressed within five seconds, itscans the bus, then assigns itself the first availableaddress {starts at 2}. It then flashes that address one time.Pressing the button two times within five seconds causesthe control to flash its address.Pressing the button three times within five seconds forcesthe control to reset its address to 1, which is the factorydefault.Current alarms or active restrictions are flashed on the ICBLED. No history is stored on the ICB.Fan On And Off DelaysThe fan ON and OFF delays can be field adjusted by pressing acombination of buttons on the UCB.• Gas Heat Option #1 - Press the LAST ERROR andTEST RESET buttons simultaneously and then release.The control flashes three times as it writes a 30 seconddelay ON and a 90 second delay OFF to the program.• Gas Heat Option #2 - Press the COMM SETUP andTEST RESET buttons simultaneously and then release.The control flashes four times as it writes a 30 seconddelay ON and a 180 second delay OFF to the program.• Electric Heat - Press and release the COMM SETUP andLAST ERROR buttons at the same time. The controlflashes twice on the LED as the control writes a 0 secondON and a 30 second OFF fan delay to the control’sprogram memory.