York SUNLINE 2000 Installation Manual

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66396-YIM-C-1004Unitary Products Group 35for loose wiring between C1 and the compressorcontactor.7. If 24 volts is not present at the C1 terminal, checkfor 24 volts from the room thermostat at the UCBY1 terminal. If 24 volts are not present at the UCBY1 terminal, the UCB may have faulted. Check for24 volts at the Y1 ECON terminal. If 24 volts is notpresent at Y1 “ECON”, the UCB has faulted. TheUCB should de-energize all compressors on a lossof call for the first stage of cooling, i.e. a loss if 24volts at the Y1 terminal.8. If 24 volts are present at the UCB Y1 terminal, thecompressor may be out due to an open high-pres-sure switch, low-pressure switch, or freezestat.Check for 24 volts at the HPS1, LPS1, and FS1terminals of the UCB. If a switch has opened, thereshould be a voltage potential between the UCB ter-minals, e.g. if LPS1 has opened, there will be a 24-volt potential between the LPS1 terminals.9. If 24 volts is present at the UCB Y1 terminal andnone of the protection switches have opened, theUCB may have locked out the compressor for repeattrips. The UCB should be flashing a code. If not,press and release the ALARMS button on the UCB.The UCB will flash the last five alarms on the LED. Ifthe compressor is locked out, remove any call forcooling. This will reset any compressor lock outs.NOTE: While the above step will reset any lock outs,compressors #3 and #4 will be held off for theASCD, and compressors #1 and #2 may be heldoff for a portion of the ASCD. See the next step.10. If 24 volts is present at the UCB Y1 terminal andnone of the switches are open and the compressoris not locked out, the UCB may have the compres-sor in an ASCD. Check the LED for an indication ofan ASCD cycle. The ASCD should time out within5 minutes. Press and release the TEST button toreset all ASCDs.11. If 24 volts is present at the UCB Y1 terminal andthe compressor is not out due to a protectiveswitch trip, repeat trip lock out, or ASCD, the econ-omizer terminals of the UCB may be improperlywired. Check for 24 volts at the Y1 “OUT” terminalof the UCB. If 24 volts is present, trace the wiringfrom Y1 “OUT” for incorrect wiring. If 24 volts is notpresent at the Y1 “OUT” terminal, the UCB must bereplaced.12. For units without economizers: If 24 volts is presentat the Y1 “OUT” terminal, check for 24 volts at theY1 “ECON” terminal. If 24 volts is not present,check for loose wiring from the Y1 “OUT” terminalto the Mate-N-Lock plug, the jumper in the Mate-N-Lock plug, and in the wiring from the Mate-N-Lockplug to the Y1 “ECON” terminal.For units with economizers: If 24 volts is present atthe Y1 “OUT” terminal, check for 24 volts at the Y1“ECON” terminal. If 24 volts is not present, check forloose wiring from the Y1 “OUT” terminal to the Mate-N-Lock plug, a poor connection between the UCBand economizer Mate-N-Lock plugs, loose wiringfrom the Mate-N-Lock plug to the economizer, backto the Mate-N-Lock plug, and from the Mate-N-Lockplug to the Y1 “ECON” terminal. The economizercontrol may have faulted and is not returning the 24volts to the Y1 “ECON” terminal even though theeconomizer is not providing free cooling. To test theeconomizer control, disconnect the Mate-N-Locksand jumper between the WHITE and YELLOWwires of the UCB’s Mate-N-Lock plug.13. The UCB can be programmed to lock outcompressor operation during free cooling and inlow ambient conditions. These options are notenabled by default. They can be checked by localdistributors.14. If none of the above corrected the error, test theintegrity of the UCB. Disconnect the C1 terminalwire and jumper it to the Y1 terminal. DO NOTjump the Y1 to C1 terminals. If the compressorengages, the UCB has faulted.15. If none of the above correct the error, replace theUCB.UNIT 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 are flashed on the UCB LED. Pressingand releasing the ALARMS button on the UCB cancheck the alarm history. The UCB will cycle through thelast five (5) alarms, most recent to oldest, separatingeach alarm flash code by approximately 2 seconds.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.

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