York SUNLINE MAGNUM DJ180 Installation Manual

Also see for SUNLINE MAGNUM DJ 180: Technical guide Technical guide Installation manual

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York SUNLINE MAGNUM DJ180 Installation Manual Manual pdf 57 page image

175231-YIM-A-0706Unitary Products Group 57present 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, 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. Theeconomizer board may have faulted and is notreturning the 24 volts to the Y1 “ECON” terminaleven though the economizer is not providing freecooling. To test the economizer board, disconnectthe Mate-N-Locks and jumper between the WHITEand YELLOW wires of the UCB’s Mate-N-Lockplug.13. 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. They can be checked by local distributors.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.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.GAS HEAT TROUBLESHOOTING GUIDENOTE: To find the Btu input, multiply the number ofcubic feet of gas consumed per hour by theBtu content of the gas in your particular locality(contact your gas company for this information- it varies widely from city to city.).On calls for heating, the draft motor operates and thefurnace lights but the supply air blower motor does notenergize after a short delay (the room thermostat fanswitch is in “AUTO” position).Troubleshooting of components may requireopening the electrical control box with thepower connected to the unit. Use extremecare when working with live circuits! Checkthe unit nameplate for the correct line voltageand set the voltmeter to the correct rangebefore making any connections with line termi-nals.When not necessary, shut off all electric powerto the unit prior to any of the following mainte-nance procedures so as to prevent personalinjury.Label all wires prior to disconnection when ser-vicing controls. Wiring errors can causeimproper and dangerous operation, whichcould cause injury to person and/or damageunit components. Verify proper operation afterservicing.The furnace may shut down on a high tem-perature condition during the procedure. Ifthis occurs, the UCB energize the supply airblower motor until the high temperature limithas reset. Caution should be used at alltimes as the supply air blower may energizeregardless of the room thermostat fan switchposition.