York SUNLINE 2000 H4CE120 Installation Manual

Contents

York SUNLINE 2000 H4CE120 Installation Manual Manual pdf 12 page image

UNIT OPERATION - 090 & 120 MBHWhen the external control calls for cooling at terminal Y1:1. The system controller (SC) is energized. The system con-troller starts the compressor and enables the condenserfan(s) by energizing contactor 1M.Condenser fan motor #1 is energized with the compressoron the 10 ton model while fan #2 is enabled with compres-sor operation. Fan motor #2 operation is controlled throughthe Ambient Temperature Switch (ATS) which will de-energize the motor when the ambient temperature falls be-low 70°F.2. Safety Lockout: The system controller (SC) has a lockoutcircuit to prevent compressor short-cycling on a safety con-trol with automatic reset. If the high or low refrigerant pres-sure switches (HP or LP) open, the SC will enter lockoutmode.SC provides a 90 second bypass of the low pressure switchLP to prevent nuisance lockouts during unit start-up.A malfunction light (24V, 2 A max. resistive load) can be en-ergized through SC, by connecting the light between termi-nals X and B on TB1. Terminal X will energize when SClocks out.NOTE: To reset the unit after a lockout:A. Turn the system switch on the thermostat to the “OFF”position and back to the “COOL” position.ORB. Increase the set point of the room thermostat above thetemperature in the conditioned space and return it to itsoriginal setting.If the unit continues to be shut down by one of its safetycontrols, service should be called to determine the cause ofthe problem. Repeated resetting of the lockout circuit maydamage the unit.035-15406-002-A-050412 Unitary Products GroupCRANKCASE HEATERThe crankcase heaters must be energized at least 8 hours beforestarting the compressor. To energize the crankcase heaters, themain disconnect switch must be closed. During this 8 hour peri-od, the system switch on the room thermostat must be “OFF” toprevent the compressor from starting.CAUTION: DO NOT ATTEMPT TO START THE COMPRES-SOR WITHOUT AT LEAST 8 HOURS OF CRANK-CASE HEAT OR COMPRESSOR DAMAGE WILLOCCUR.Make sure that the bottom of the compressor is warm to the touchto prove crankcase heater operation.PRE-START CHECKBefore starting the unit, complete the following check list:1. Have sufficient clearances been provided?2. Has all foreign matter been removed from the interior of theunit (tools, construction or shipping materials, etc.)?3. Have the condenser fans been rotated manually to check forfree rotation?4. Are all wiring connections tight?5. Does the available power supply agree with the nameplatedata on the unit?6. Is the control circuit transformer set for the proper voltage?7. Have the fuses, disconnect switch and power wire been sizedproperly?8. Are all compressor hold-down nuts properly secured?9. Are any refrigerant lines touching each other or any sheetmetal surface? Rubbing due to vibration could cause a refrig-erant leak.10. Are there any visible signs of a refrigerant leak, such as oilresidue?11. Is any electrical wire laying against a hot refrigerant line?INITIAL START-UP1. Supply power to the unit through the disconnect switch atleast 8 hours prior to starting the compressor.2. Move the system switch on the thermostat to the AUTO orCOOL position.3. Reduce the setting of the room thermostat to energize thecompressor.4. Check the operation of the evaporator unit per the manufac-turer's recommendations.5. With an ammeter, check the compressor amps against theunit data plate.6. Check for refrigerant leaks.7. Check for any abnormal noises and/or vibrations, and makethe necessary adjustments to correct (e.g. fan blade(s)touching shroud, refrigerant lines hitting on sheet metal, etc.)8. After the unit has been operating for several minutes, shut offthe main power supply at the disconnect switch and inspectall factory wiring connections and bolted surfaces for tight-ness.OPERATIONSTART-UP