Bard Q-TEC Q24H1 Installation Instructions Manual

Bard Q-TEC Q24H1 Installation Instructions Manual Manual pdf 20 page image

Manual 2100-519CPage 20 of 42LOW VOLTAGE CONNECTIONSThese units use a grounded 24 volt AC low voltagecircuit.The “R” terminal is the hot terminal and the “C”terminal is grounded.“G” terminal or pins 6 and 1 of P2 are the fan inputs.Both must be energized for proper fan operation. Thisis done automatically in the factory installed climatecontrol options. If the climate control option isabandoned and connections are made directly to P2 bothpins 6 and 1 of P2 must be energized for properoperation.“Y” terminal or pin 7 of P2 is the compressor input.“B” terminal or pin 8 of P2 is the reversing valve input.The reversing valve must be energized for heatingmode.“R” terminal or pin 10 of P2 is 24 VAC hot.“C” terminal or pin 11 of P2 is 24 VAC grounded.“L” terminal or pin 12 of P2 is compressor lockoutoutput. This terminal is activated on a high or lowpressure trip by the electronic heat pump control. Thisis a 24 VAC output.“W2” terminal or pin 9 of P2 is second stage heat (ifequipped). If the unit is equipped with an optional hotwater coil plenum box or electric heat these will beenergized by this terminal.“O1” terminal of pin 5 of P2 is the ventilation input.This terminal energizes any factory installed ventilationoption.“E” terminal or pin 3 of P2 is the emergency heat input.This terminal energizes the emergency heat relay.ROFSNOITCENNOCEGATLOVWOLLORTNOCCDDylnOnaF GezigrenEedoMgnilooC G,YezigrenEgnitaeHpmuPtaeH B,G,YezigrenEgnitaeHegatSdn2)deyolpmefi(2W,GezigrenEnoitalitneV 1O,GezigrenEtaeHycnegremE E,2W,BezigrenEGENERALThis unit is equipped with a variable speed ECM motor.The motor is designed to maintain rated airflow up tothe maximum static allowed. It is important that theblower motor plugs are not plugged in or unpluggedwhile the power is on. Failure to remove power priorto unplugging or plugging in the motor could result inmotor failure.CAUTIONDo not plug in or unplug blower motorconnectors while the power is on. Failure to doso may result in motor failure.NOTE: For total and proper control using DDC, a totalof 6 controlled outputs are required (5 if noventilation system is installed). For propersystem operation under Emergency Heatconditions. Where the compressor needs to bedeactivated, the B-W2-E outputs need to beenergized. Removing the Y (compressor) signalalone turns the compressor off, but does notactivate the additional circuitry embedded inthe heat pump for proper and completeoperation.