York sunline 2000 Installation Manual

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York sunline 2000 Installation Manual Manual pdf 46 page image

362242-YIM-B-010946 Johnson Controls Unitary ProductsUNIT FLASH CODESVarious flash codes are utilized by the unit controlboard (UCB) to aid in troubleshooting. Flash codes aredistinguished by the short on and off cycle used(approximately 200ms on and 200ms off). To shownormal operation, the control board flashes a 1 secondon, 1 second off “heartbeat” during normal operation.This is to verify that the UCB is functioning correctly.Do not confuse this with an error flash code. To preventconfusion, a 1-flash, flash code is not used.Current alarms or active restrictions are flashed on theUCB LED.• LAST ERROR - When this button is pressedand released one time within five seconds, itflashes the last five flash codes on theboard’s LED. The most recent alarm is shownfirst and the oldest alarm is shown last.When pressed and released twice within a fivesecond span, the fault history is cleared.• TEST RESET - When this button is pressedand released one time within five seconds,any anti-short cycle delays (ASCD) is by-passed for one cycle.When this button is pressed twice within five sec-onds, any active lockouts are reset.• COMM SET UP - If the board is to be net-worked with other units, this button is used toset the network address.The first time the button is pressed within fiveseconds, it scans the bus, then assign itself thefirst available address {starts at 2}. It then flashesthat address one time.Pressing the button two times within five secondscauses the control to flash its address.Pressing the button three times within five sec-onds forces the control to reset its address toone, which is the factory default.In some cases, it may be necessary to “zero” theASCD for the compressors in order to perform trouble-shooting. To reset all ASCDs for one cycle, press andrelease the UCB TEST button once.FIGURE 14 - UNIT CONTROL BOARDComm SetupButtonLast ErrorButtonTest ResetButtonControl BoardLED

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