York MHC-MHH Installation Manual
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12HIGH WALL Vertical Discharge Condensing Unit(H*DA, H*DB, H*RA)The indoor unit and interconnecting wiring voltage is220 volts. Where the outdoor unit requires a differentoperating voltage such as 24 volts one of the followingsolutions can be applied.1. The coil of the relay switching the compressor andreversing valves should be changed to a 220V coil.2. A transformer should be installed to supply 24 voltsand a relay installed with a 220 volt coil to switch the24 volts required by the outdoor units. The transformershould be energised at all times and not switched bythe start signal from the indoor unit. Switching thetransformer directly will cause electronic noise whichmay cause malfunction of the electronics. WiringL N 1 2For further detail on wiring of these units, see the diagrams pastedinside each unit.Cautions• Never modify the unit by removing any of the safetyguards or by bypassing any of the safety interlockswithces.• Connect the connecting cable correctly and connectthe connecting cable to terminal as identified with theirrespective marks.• Do not scratch the conductive core & inner insulator ofpower supply cables and do not deform or smash onthe surface of cables. Electrical ConnectionsAll electrical wiring and connections must comply withlocal codes and standards. Power supply cord andinterconnection cord used must not be lighter thanPolychloroprene sheated cord (245 IEC 57 or H05RN-F).Disconnecting device must have a contact separationof at least 3 mm.MHC 07-25 -Cooling Only21 31NL 2N 43 4MHC 07-25 -Heat Pump21 31NL 2N 43 4For correct installation, a proper ground connection must bemade for unit.Wiring sizesOr as required to meet national and local codes.Notes• Terminals N and 1 (see diagrams above) correspondto power supply to the indoor unit coming from theoutdoor unit.• Compressor power supply is established by teminal 2.• Power supply to the 4-way valve is established byterminal 3.• For further details on wiring of these units, see thediagrams pasted inside each unit.IndoorUnitOutdoorUnitIndoorUnitOutdoorUnitPower 220-240V/1Ph/50HzSupply 208-230V/1Ph/60HzUnit size 7 9 12 18 25Power supply mm 2 3x2.5 3x4Interconnection Cooling mm 2 3x2.5 + Ground(Indoor/Outdoor) Heating mm 2 4x2.5 + GroundFuse (slow-Blow) A 10 16 20IndoorUnitCooling Only Units24 V FROM OUTDOOR UNITPower Supply Power 220-240V/1Ph/50HzSupply 208-230V/1Ph/60Hz |
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