York sunline 2000 Installation Manual

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York sunline 2000 Installation Manual Manual pdf 45 page image

362242-YIM-B-0109Johnson Controls Unitary Products 45on the LED. If the compressor is locked out, cancelany call for cooling. This will reset any compressorlock outs.NOTE: While the above step will reset any lockouts,the compressor may be held off for 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 and thecompressor is not out due to a protective switch trip,repeat trip lock out, or ASCD, the economizer termi-nals of the UCB may be improperly wired. Check for24 volts at the Y1 “OUT” terminal of the UCB. If 24volts is present, trace the wiring from Y1 “OUT” forincorrect wiring. If 24 volts is not present at the Y1“OUT” terminal, the UCB must be replaced.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.13. 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, checkfor loose wiring from the Y1 “OUT” terminal to theMate-N-Lock plug, a poor connection between theUCB and economizer Mate-N-Lock plugs, loosewiring from the Mate-N-Lock plug to the econo-mizer, back to the Mate-N-Lock plug, and from theMate-N-Lock plug to the Y1 “ECON” terminal. Ifnothing is found, the economizer actuator mayhave faulted and is failing to return the 24-volt “call”to the Y1 “ECON” terminal even though the econo-mizer is not providing free cooling. To test, discon-nect the Mate-N-Locks and jumper between theWHITE and YELLOW wires of the UCB’s Mate-N-Lock plug. If the compressor energizes, there is afault in the economizer wiring or actuator.14. The UCB can be programmed to lock out compres-sor operation during free cooling and in low ambi-ent conditions. These options are not enabled bydefault. Local distributors can test the UCB for thisprogramming.For units with factory installed economizers, theUCB is programmed to lock out compressor opera-tion when the LAS set point is reached.For units without factory installed or with fieldinstalled economizers, the UCB allows compressoroperation all the time. This programming can bechecked or changed by the local distributor.15. If none of the above correct the error, replace theUCB.

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