York MMC 25S24U15 User's Manual
Contents
1. continuity and resistance between terminals using an accurate ohmmeter Compressor seized Replace compressor cessive heat load Check for excessive fresh air intake and or inadequate insulation of conditioned space If excessive load is permanent a larger capacity or second unit may be necessary Shortage of refrigerant Locate and repair leak evacuate and re charge Dirty condenser Clean condenser Compressor inefficient Check suction pressure and other possible source of trouble before replacing the compressor Defective room thermostat If room temperature is satisfactory and unit continues to operate set the thermostat to lower or warmer setting If compressor won t start replace thermostat 8 Overcharge of refrigerant Purge evacuate and re charge with correct amount of refrigerant Air or non condensable in the system Purge evacuate and re charge Dirty condenser Clean fins and blow out with compressed air Refrigerant shortage Locate leak repair evacuate and re charge Compressor suction or discharge valves inefficient Replace compressor Excessive load on the evaporator Check for excessive fresh air intake andor inadequate insulation of conditioned space Compressor inefficient If excessive load is permanent a larger capacity or second unit may be necessary Check suction pressure and other possible source of trouble before replacing the compressor Refrigerant shortage Loc2. 040 Ise Lan Compressor Refrigerant Power Supply M Max Outdoor Temperature 4 Power Consumtion Noise Level 2 5m Indoor dB A Gm Piping Diameter Suction Weights ID OD Cooling Capacity is based on 27 C DB 19 C WB Indoor Air Temp 35 C Outdoor Air Temp Piping length 7 5m For multiple indoor units indoor noise reters to all units in the same room u D e i 4 x 380 34 37 39 34 37 39 34 37 39 5 E S D 3 o m ES E e 4x 3 8 3x1 4 4x1 4 799 850 ma 181 287 181 287 e 3 Dimensions Overall dimensions Outdoor units MMC 21and 25 21 and 25 Unit installation entails unit mounting refrigerant piping connections condensate water drainage connections on heat pump units unit wiring connections Outdoor unit clearances A minimium of clearance is necessary around the units to ensure proper air circulation and easy access for maintenance and service operations MMC21and MMC25 200 400 100 Outdoor unit placement Make piping runs as short as possible and avoid all unnecessary changes in direction or elevation To prevent heat loss the two lines must be insulated separately Fix piping with pipe clamps and check that any eventual pipe vibrations cannot be transmitted to the building structure Use refrigeration quality piping only with an operating pressure AA rat
3. MULTISPLIT ing uni Condens SI YPCSSc OWN PUE STNEZSTZ JWA SPPOIN SUIDISAS ATUO guo ENUEJA SUBUSJUIE A ODC uopejpujsug 035T70078 000 List of Contents 1 Safety 2 Technical Specifications 3 DIMENSIONS 4 ASA NAN ON hole 5 Refrigerant Circuit Connections 6 Service and Maintenance 7 Wiring Diagram ii 8 Trouble shooting Guide Parts List Contact York Decommissioning Dismantling and Disposal lt dsSatet CS Installation and maintenance of this air conditioning system should only be carried out by trained and qualified personnel Regular maintenace operations such as cleaning the coils and air filters must be performed to keep the units in proper operating condition CAUTION Before undertaking any work on the unit make sure that the power supplly has been disconnected ELECTRICAL CONNECTIONS All electrical wiring and connections must comply with local standards Power supply cord used must not be lighter than Polychloroprene sheated cord 245 IEC 57 or HOSRN F Disconnecting device must have a contact separation of at least 3 mm GENERAL PRECAUTIONS Check that the power supply available agrees with nameplate voltage Use adequate line protection The unit must be grounded 2 Technical Specifications kd 4 x MHCO9N Models Outdoor unit vm aom maso e ann Lass Los 20 zmo oue bal 2
4. agram POWER SUPPLY 220 240 V 1Ph 50Hz OK SIPS Anz ON Hos Gor Ki 9 a aa a MMC21 S23 U15 MMC25 S24 U15 8 Trouble shooting Guide Probiem Compressor does not run B Compressor short cycles Compressor tries to start but only hum L Compressor runs continuously E Head pressure too high F Head pressure too low F Head pressure too low IG Suction pressure too high K Suction pressure too low 1 2 3 4 5 6 T 2 3 4 1 2 3 4 2 3 4 5 N 10 N Wi 1 2 Probable cause and remedy Control fuse blown Replace fuse If new fuse blows immediately look for electrical grounding in system Defective lockout relay Before condemning the relay turn control switch to OFF and then back to the selected setting This de energises lockout relay If the fault condition has been corrected the compressor will start If compressor fails to start check continuity through relay Replace relay if necessary Pressure control defective Replace control if defective or out of calibration The encaps ulated type of control cannot be re calibrated in the field Open contacts on low pressure switch Suction pressure below cut out setting Locate and repair refrigerant leak Evacuate 4 re charge system Open contacts on High pressure switch Discharge pressure above cut out setting Refer to section E Tripped cr defective condenser fan overload In
5. ate leak repair evacuate and re charge Partial or complete restriction in refrigerant system Check for excessively cold or frosted area in liquid line check tx valve operation and power element CUSTOMER INSTALLATION UNITARY equipment Simplified Diagram a YORK YORK INTERNATIONAL DE COMMISSIONING DISMANTLING amp DISPOSAL This product contains refrigerant under pressure rotating parts and electrical connections which may be a danger and cause injury All work must only be carried out by competent persons using suitable protective clothing and safety precautions O A A Read the Manual Risk of electric shock Unit is remotely controlled and may start without warning Isolate all sources of electrical supply to the unit including any control system supplies switched by the unit Ensure that all points of electrical and gas isolation are secured in the OFF position The supply cables and gas pipework may then be disconnected and removed For points of connection refer to unit installation instructions Remove all refrigerant from each system of the unit into a suitable container using a oe ied or ea unt This ed seet ny then be re used if appropriate or returned to the manufacturer for disposal 2 ould gi phe appropriate drain the refrigerant oil from each system into a suitable container and dispose of according to local laws and regulations governing disposal of oily wastes Packaged unit can generally be removed in
6. correctly set overload Set to specification Motor windings not to spec replace motor Intermittent contact in electrical circuit Repair or replace defective electrical control Overcharge of refrigerant or non condensable gas in the system air High discharge pressure Purge the entire system Evacuate and re charge Cycling on L P control Lack of refrigerant Locate amp repair leak Purge evacuate amp re charge Voltage fluctuation Voltage must be within 10 of unit name plate rating Motor compressor cutting out on overload Increased current draw due to tight compressor Replace compressor Incorrectly set overload Set overload to specified setting as per wiring diagram Defective compressor Condemn and replace compressor only as a last resort and after all other possible sources of trouble are eliminated ncorrectly wired Check wiring against diagram Low line voltage Check voltage at the unit while compressor is trying to start Voltage must be within 10 of the unit name plate rating Compressor windings resistance not to spceification Check continuity and resistance betweem terminals using an accurate ohmmeter Compressor seized Replace compressor Incorrectiy wired Check wiring against diagram Low line voltage Check voltage at the unit while compressor is trying to start Voltage must be within 10 of the unit name plate rating Compressor wingings resistance not to spceification Check
7. e required Media should be replaced annually for most ducted models 2 Check refrigerant circuit for correct refrigerant charge 3 Checkthe condenser coil for any obstructions or excessive dirt and if necessary hose the coil from the inside of the cabinet taking care not to damage the aluminium fins This is NOT a warrantable process It is the owners responsibility ANNUAL MAINTENANCE 1 Repeat the monthly schedule 2 Connect service gauges and record the operating pressures and mode 3 Test the superheat setting by placing a thermocouple at the suction outlet and subtract that temperature from the suction temperature at the compressor A reading of 4 C to 6 C is acceptable 4 Check cabinet for any missing paint from chips or abrasions and treat accordingly Check blower wheel s for dirt build up tightness on shaft Check condensate drain tray for clean water flow Clean tray if necessary Check all cabinet panels for correct fitting and alignment 7 Clean cabinet as required Check thermostat operation and set point Polish cabinet at intervals the same as you would a motor car paint finish Measure and record the amperage of each motor against nameplate details Record voltages between phases and phases to earth and neutral Replace filter media where required If belt drive evaporator fans adijust vee belt 7 Wiring Diagram Wire Sizes and Fuses Wiring Di
8. ing of at least 30 bars Never use ordinary lt lt plumbing gt gt quality piping you MUSTuse special de oxidised dehydrated refrigerant quality copper piping m oor Sa aT EXER HCOON 4xMHCOSN UntSze ce ics Bees 2 Refrigerant piping connections FLARE connections To avoid alteration of unit capacities check that piping lengths and changes in elevation are kept to a strict minimum Before connecting the refrigerant lines follow the procedures below if pre charged connection lines are not supplied Select copper pipe diameters according to the size of unit to be installed Install the refrigeration lines checking that no foreign boodies get inside the piping Install the flare connectors and flare the ends of the pipes Evacuate the piping This operation which should last atleast 15 minutes or even longer if there are large piping lengths and changes in elevation should be followed by a leak test To this effect when the piping has been evacuated close the pressure gauge tap note the value on the gauge then wait for 15 minutes lf the needle moves there is a leak in the system Make the necessary adjustments or repairs and repeat this procedure until the needle no longer moves Open the service valves and top up the refrigerant charge if necessary High pressure MONTHLY MAINTENANCE 1 Air filters require cleaning every 4 weeks or earlier In some areas weekly filter cleans may b
9. one piece after disconnection as above Any fixing down bolts should be removed and then unit lifted from position using the points provided and equipment of adequate lifting capacity Reference MUST be made to the unit installation instructions for unit weight and correct methods of lifting Note that any residual or spilt refrigerant oil should be mopped up and disposed of as described above After removal from position the unit parts may be disposed of according to local laws and regulations a YORK YORK INTERNATIONAL TE MUS908 010
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