York SUNLINE 2000 D1EE 048 Installation Instruction

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York SUNLINE 2000 D1EE 048 Installation Instruction Manual pdf 12 page image

The heaters are wired for a single point power supply. Powersupply need only be brought into the single point terminal blockand thermostat wiring to the low voltage terminal strip locatedin the upper portion of the unit control box.Fuses are supplied, where required, by the factory. Some KWsizes require fuses and others do not. Refer to the accessoryinstruction for electrical data.COOLING SYSTEMThe cooling section is a complete factory package utilizing anair-cooled condenser. The system is factory-charged withRefrigerant-22. The compressor is hermetically sealed andinternally sprung.The compressors have inherent (internal) protection. If there isan abnormal temperature rise in the compressor, the protectorwill open to shut down the compressor.PRELIMINARY OPERATION COOLINGAfter the installation has been completed, the crankcaseheater of the compressor must be energized for at least 4 hoursbefore starting the unit. After this initial warm-up, thecompressor should be given three false starts (energized justlong enough to make a few revolutions) with a 5 minute delaybetween each start 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 OPERATIONSingle-Stage Cooling:When the thermostat calls for “cooling”, “R” is closed to “G” and“Y1" (wiring schematic) which completes the low voltagecontrol circuit, immediately energizing the compressors,condenser fan motor and blower motor simultaneously.Two-Stage Cooling:A two-stage cooling thermostat may be used if the unit has aneconomizer. First-stage cooling is provided by the economizerif the outdoor air enthalpy is acceptable, and second-stagecooling is provided by the compressor. Jumper wire J1 must beremoved. Refer to unit wiring diagram.After the thermostat is satisfied and opens, the blower willcontinue to run for a short time. All other components will stop.SAFETY CONTROLSThe refrigerant system is equipped with the following safetycontrols:1. A Suction Line Freezestat to protect against low evaporatortemperatures due to a low air flow or a low return air tem-perature.2. A High Pressure Cutout Switch to protect against excessivedischarge pressures due to a blocked condenser coil or acondenser motor failure.3. A Low Pressure/Loss of ChargeSwitch to protect against loss of refrigerant charge.If either of the above safety controls opens, the refrigerantsystem will be locked out. The lock out of the system can bereset by opening the 24V circuit either at the room thermostator at the unit disconnect.HEATING SEQUENCE OF OPERATIONThe following sequence of operation is based on using astandard single-stage or two-stage heating thermostat.WITH POWER TO UNIT AND THERMOSTAT IN THEHEATING MODESingle-Stage Heating:a. If the fan switch is in the “ON” position, the evaporatorblower motor relay (BR) will be energized through terminalG to provide continuous blower operation. If the fan switchis in the “AUTO” position, the blower will operate only whenthere is a call for heating by the thermostat.b. Upon a call for heat by the thermostat, the first stage of heatwill be energized. Sequencer 1S (or contactor 2M) is al-ways the first and last to complete its timing cycle and con-trols power to the evaporator blower motor.c. The thermostat will cycle the electric heat to satisfy theheating requirements of the conditioned space.Two-Stage Heating:a. If the fan switch is in the “ON” position, the evaporatorblower motor relay (BR) will be energized through terminalG to provide continuous blower operation. If the fan switchis in the “AUTO” position, the blower will operate only whenthere is a call for heating by the thermostat.b. Upon a call for first-stage heat by the thermostat, the firststage of heat will be energized.If the thermostat calls for the second stage of heat, thesecond stage of heat will be energized.As before, sequencer 1S (or contactor 2M) maintainscontrol of the evaporator blower.c. The thermostat will cycle the electric heat to satisfy theheating requirements of the conditioned space.CONTINUOUS BLOWER - Continuous blower operation ispossible by closing the R to G circuit on the thermostat.035-12046-003-A-020412 Unitary Products GroupOPERATIONNOMINALHEATERSIZEKWVOLTAGESETTING, AMPSTH1 TH25710152030240-1-600.160.350.350.350.350.35---0.190.380.385710152030240-3-600.350.350.350.350.350.35---0.190.380.38710152030480-3-600.350.350.350.370.37---0.290.2910152030600-3-600.350.350.370.37--0.290.29TABLE 10 - HEAT ANTICIPATOR SETTING