Manuals / Carrier / Household Appliance / Heating System

Carrier 48PG20-28 specifications Roof Curb Details

Models: 48PG20-28

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Fig. 1 — Roof Curb Details

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Fig. 1 — Roof Curb Details

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Carrier 48PG20-28 specifications Roof Curb Details

Contents

Installation, Start-Upand Service Instructions CONTENTSSAFETY CONSIDERATIONS INSTALLATION Step 1 - Provide Unit Support Fig. 1 - Roof Curb Details Fig. 2 - Shipping Rail Removal Fig. 3 - Rigging DetailsSHIPPING RAILS Fig. 4 - Base Unit Dimensions Table 1 - Physical Data 48PG 1750 Fig. 8 - Air Distribution - Concentric Duct Step 5 - Make Unit Duct ConnectionsFig. 5 - Alignment Hole Details Fig. 6 - Alignment Hole LocationFig. 10 - Flue and Inlet Hood Locations Step 6 - Install Flue Hood and Inlet HoodFig. 11 - Combustion Fan Housing Location Fig. 9 - Concentric Duct DetailsFig. 14 - Field Gas Piping Step 9 - Make Electrical ConnectionsFig. 12 - Condensate Drain Details Fig. 13 - Condensate Drain Piping DetailsShipping Location Fig. 15 - Field Power Wiring ConnectionsFig. 16 - Field Control Thermostat Wiring Fig. 17 - Outdoor-AirHood ComponentCOMPRESSOR 10.6 Fig. 18 - Outdoor-AirHood Details LEGEND AND NOTES FOR TABLES 4A AND 4BFig. 20 - Manual Damper Details Fig. 19 - Outdoor-AirHood AssembledFig. 22 - Bracket and Hood Positioning START-UP PRE-START-UP3.Connect pressure gage to manifold pressure tap AIRFLOW AIRFLOW AIRFLOW AIRFLOW Page AIRFLOW AIRFLOW Page AIRFLOW AIRFLOW Page AIRFLOW Page Page AIRFLOW AIRFLOW GENERAL NOTES FOR FAN PERFORMANCE DATA TABLES Table 24 - Operation Air Quantity Limits Table 25 - Evaporator Fan Motor SpecificationsHD60FK651 Table 27 - Fan Rpm at Motor Pulley Settings Fig. 25 - Temperature Changeover Set Points Fig. 24 - Sensor Locations OAT and MATTable 28 - EconoMi$er IV Sensor Usage Fig. 26 - EconoMi$er IV Wiring 13B C APPROXIMATE DRY BULB TEMPERATURE- F CFig. 27 - Enthalpy Changeover Set Points and LED LocationsTO x OA + TR x RA = TM Operating Sequence Table 29 - CO2 Sensor Standard SettingsFig. 30 - Subcooler Operation What to do if you smell gas SERVICEBaffles and Clips LubricationFig. 32 - Removing Heat Exchanger Ceramic Fig. 31 - Typical Gas Heating SectionFig. 34 - Evaporator-FanAlignment and Adjustment Fig. 33 - Evaporator-FanMotor AdjustmentTable 31 - Sensor Temperature/Resistance Values Condenser-FanAdjustment FigTable 30 - Belt Tension Adjustment Fig. 35 - Condenser-FanAdjustmentFig. 39 - Charging Chart - 48PG28 Gas Valve AdjustmentFig. 37 - Charging Chart - 48PG20 Fig. 38 - Charging Chart - 48PG24Fig. 40 - Gas Valve Fig. 41 - Spark Gap AdjustmentTable 32 - Altitude Compensation Protective DevicesFig. 42 - Typical Low Voltage Control Schematic Fig. 43 - Typical Power Schematic Page LEGEND FOR FIG Fig. 45 - Typical Component Arrangement - 48PG28TROUBLESHOOTING Table 33 - Cooling Service AnalysisLEGEND TXV - Thermostatic Expansion Valve CAUSE Table 34 - Gas Heating Service AnalysisPROBLEM Poor Flame CharacteristicsFig. 46 - IGC Control Heating and Cooling LEGEND IDM - Induced-DraftMotorIGC - Integrated Gas Unit Controller Table 35 - IGC Board LED Alarm Codes EconoMi$er IV TroubleshootingMIXED-AIRINPUT - To check mixed-airinput Copyright 2005 Carrier Corporation Page II.START-UP UNIT START-UPCHECKLISTTEMPERATURES I. PRE-START-UP