Carrier 48MA/50ME016-040 Installation, Start-up And Service Instructions Manual

Contents

Carrier 48MA/50ME016-040 Installation, Start-up And Service Instructions Manual Manual pdf 1 page image

Installation, Start-Upand Service InstructionsCONTENTSPageSAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . 2INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-34General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2Unit Clearances . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2Roof Curb . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2Roof Openings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2Rigging Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5Unit Positioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5Removing Shipping Shields . . . . . . . . . . . . . . . . . . 5Field-Fabricated Ductwork . . . . . . . . . . . . . . . . . . . . 5Condensate Drains . . . . . . . . . . . . . . . . . . . . . . . . . . . 9Gas Piping (48MA) . . . . . . . . . . . . . . . . . . . . . . . . . . . 9Optional Glycol Connections (50ME) . . . . . . . . . 10Field Power Supply Wiring . . . . . . . . . . . . . . . . . . 10• UNIT COMMON FEED MINIMUM CIRCUIT AMPSField Control Wiring . . . . . . . . . . . . . . . . . . . . . . . . . 14• ZONE THERMOSTATS• ZONE MODULE CONNECTIONS• ACCESSORY REMOTE CONTROL PANELReheat Humidity Control . . . . . . . . . . . . . . . . . . . . 34Optional Economizer . . . . . . . . . . . . . . . . . . . . . . . . 34Optional Exhaust Damper . . . . . . . . . . . . . . . . . . . 34START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34-39Evaporator Fan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34Compressor Rail Shipping Bolts . . . . . . . . . . . . . 34Refrigerant Valves . . . . . . . . . . . . . . . . . . . . . . . . . . 34Zone Module Gas Valves (48MA) . . . . . . . . . . . . . 34Gas Heat Lighting Procedure (48MA) . . . . . . . . . 35• TO SHUT OFF GAS HEATIntermittant Pilots (48MA) . . . . . . . . . . . . . . . . . . . 35• ADJUSTMENT• PRESSURE ADJUSTMENT (NATURAL GAS)Main Burner Adjustment (48MA) . . . . . . . . . . . . . 36• ORIFICE ALIGNMENT• PRIMARY AIR ADJUSTMENTOutdoor-Air Thermostat Adjustment(50ME With Electric Heat) . . . . . . . . . . . . . . . . . . 36• UNITS WITH 2-ELEMENT HEATERS• UNITS WITH 3-ELEMENT HEATERSOptional Glycol Heating Coils . . . . . . . . . . . . . . . . 38Zone Airflow Adjustment . . . . . . . . . . . . . . . . . . . . 38Sequence of Operation . . . . . . . . . . . . . . . . . . . . . 38• COOLING• HEATING (48MA)• HEATING (50ME WITH ELECTRIC HEAT)• HEATING (50ME WITH GLYCOL HEATING COILS)• OUTDOOR-AIR DAMPERSERVICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39-43Cabinet Panels and Grilles . . . . . . . . . . . . . . . . . . 39• SIDE PANELS• TOP PANELS• HEATER ACCESS PANELSCleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39• EVAPORATOR COILS (ZONE COOLING COILS)AND GLYCOL HEATING COILS• CONDENSER AND OUTDOOR-AIR COOLINGCOILS• CONDENSATE DRAINS• INDOOR-AIR FILTERS• OUTDOOR-AIR INLET SCREENS• GAS HEATING SECTION• COMBUSTION AIR FANAirflow Switches . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39• INDOOR AIRFLOW SWITCH (AFS1)• COMBUSTION AIRFLOW SWITCH (AFS2)Service Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39Time GuardT Control Circuit . . . . . . . . . . . . . . . . . 39Capacity Control Pressure Switches (CCP)(2-Compressor Units Only) . . . . . . . . . . . . . . . . 39Compressor Oil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39• TO ADD OR REMOVE OILCompressor Capacity Control Unloader(s) . . . . 40• CONTROL SET POINT• PRESSURE DIFFERENTIALCrankcase Heater(s) . . . . . . . . . . . . . . . . . . . . . . . . . 40Refrigerant Charge . . . . . . . . . . . . . . . . . . . . . . . . . . 40• NO CHARGE• LOW CHARGEHead Pressure Control . . . . . . . . . . . . . . . . . . . . . . 40• MOTORMASTERt HEAD PRESSURE CONTROLDEVICE• FAN CYCLING PRESSURESTATCondenser Fans . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41• ADJUSTMENT• FAN MOTOR REMOVAL• LUBRICATIONEvaporator Fans and Motor . . . . . . . . . . . . . . . . . . 41• MOTOR REMOVAL• FAN SHAFT BEARING REMOVAL• FAN SPEED ADJUSTMENT• PULLEY REMOVAL• PULLEY ALIGNMENT• BELT TENSION ADJUSTMENT• LUBRICATIONForced-Draft Blower (48MA) . . . . . . . . . . . . . . . . . 42• LUBRICATION• AIR SHUTTER ADJUSTMENTZone Module Transformers . . . . . . . . . . . . . . . . . . 42Optional Economizer . . . . . . . . . . . . . . . . . . . . . . . . 42• THERMOSTAT SETTINGS• DAMPER POSITION• OPERATIONOptional Exhaust Damper . . . . . . . . . . . . . . . . . . . 42Replacement Parts . . . . . . . . . . . . . . . . . . . . . . . . . . 42START-UP CHECKLIST . . . . . . . . . . . . . . . . . . . . . CL-148MA/50ME016-040Combination Multizone Heating/Cooling UnitsGas, Electric, or Glycol HeatManufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.Book 1 1Tab 1c 1dPC 111 Catalog No. 564-840 Printed in U.S.A. Form 48MA/50ME-3SI Pg 1 4-96 Replaces: 48MA/50ME-1SI