York Sunline 2000 Installation Instruction

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York Sunline 2000 Installation Instruction Manual pdf 12 page image

COOLING SYSTEMThe unit has an air-cooled condenser and is factory-chargedwith Refrigerant-22.The compressor is hermetically sealed, internally sprung,mounted on spring isolators and inherently (internally)protected. If there is an abnormal temperature rise in thecompressor, the protector will open to shut down thecompressor.PRELIMINARY OPERATION COOLINGAfter the installation has been completed, the crankcase heaterof the compressor must be energized for at least 4 hours beforestarting the unit. After this initial warm-up, the compressorshould be given three false starts (energized just long enoughto make a few revolutions) with a 5 minute delay between eachstart before being put into full time service.NOTE: Prior to each cooling season, the crankcase heatermust be energized at least 10 hours before the systemis put into operation.COOLING SEQUENCE OF OPERATIONWhen the thermostat calls for cooling, the compressor and theoutdoor fan motor will be energized through terminal "Y1" andthe supply air blower motor will be energized through terminal"G" (if the fan switch on the subbase is set in the "AUTO"position). The supply air blower motor will run continuously ifthe fan switch is set in the "ON" position.The reversing valve is energized thru the "O" circuit when thesubbase is in the cooling mode.HEATING SEQUENCE OF OPERATIONThe following sequence of operation is based on using astandard YORK heat pump thermostat with two heating stages.FIRST STAGE HEATWhen the thermostat calls for heating, the compressor and theoutdoor fan motor will be energized through terminal "Y1" andthe supply air blower motor will be energized through terminal"G" (if the fan switch on the subbase is set in the "AUTO"position). The supply air blower motor will run continuously ifthe fan switch is set in the "ON" position.SECOND STAGE HEATIf compressor operation can not satisfy the heatingrequirements, second stage heat will energize supplementalelectric heat (if supplied) thru the "W1" circuit.DEFROST SEQUENCE OF OPERATIONThe BCH has a unique “ambient modified” time-temperaturedefrost control that automatically adjusts to changes in theoutdoor temperature. The defrost control will shorten thedefrost initiation time periods above 35°F and will extend thedefrost initiation time periods below 35°F. The control is factoryset to defrost at 110 minutes (T3), but it can be field adjustedto defrost at 80 minutes (T2) or 50 minutes (T1) in areas withhigh humidity.The curve in Figure 7 shows how defrost initiation times areautomatically compensated for changes in outdoortemperature.EXAMPLE: If the time is factory set on pin T-3 (110 minutes at35°F outdoor) and the outdoor temperature climbs to 45°F, thetime initiation cycle will decrease to every 100 minutes.If the outdoor temperature drops to 10°F where ice is less likelyto form, the 110 minute interval will extend to every 150minutes.Two requirements must be met before a defrost cycle can beinitiated.1. The defrost time cycle must be complete.2. The liquid line temperature must be less than 28°F.Defrost will terminate when the liquid line sensor reaches 55°For after 10 minutes.The defrost time cycle will restart 10 minutes after the start ofthe defrost cycle even though the liquid sensor terminateddefrost after 3 minutes.During troubleshooting, the defrost time can be reduced to 20seconds by shorting out the SW1 test pegs on the module. Thepegs are 1/2" long, 3/16" apart and are mounted on a whitebase. See Figure 8.T1 - 50 MINUTE SETTINGT2 - 80 MINUTE SETTINGT3 - 110 MINUTE SETTING(Factory Set Point)SHORTING PEGS TOOVERRIDE TIMERFOR SERVICEMOVABLE JUMPERWIRE TO CHANGEDEFROST TIMERFIG. 7 - DEFROST INITIATION TIMESFIG. 8 - AMBIENT MODIFIED TIME/TEMPERATURECONTROLT1 - 50 Minute SettingT3 - 110 Minute Setting (Factory Set Point)T2 - 80 Minute Setting200-10 0 10 20 30 40 5025015010050060OUTDOOR AMBIENT, DEG. FTIME BETWEEN DEFROST CYCLES, MINUTESOPERATION511.06-N5Y12 Unitary Products Group