Manuals / Carrier / Household Appliance / Heating System

Carrier 48PG20-28 specifications Copyright 2005 Carrier Corporation

Models: 48PG20-28

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Copyright 2005 Carrier Corporation

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Book	1	4	PC 111	Catalog No. 534-80211	Printed in U.S.A.	Form 48PG-10SI	Pg 62	9-05	Replaces: New
Tab	1a	6a

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Carrier 48PG20-28 specifications Copyright 2005 Carrier Corporation

Contents

SAFETY CONSIDERATIONS Installation, Start-Upand Service InstructionsCONTENTS INSTALLATION Step 1 - Provide Unit Support Fig. 1 - Roof Curb Details SHIPPING RAILS Fig. 2 - Shipping Rail RemovalFig. 3 - Rigging Details Fig. 4 - Base Unit Dimensions Table 1 - Physical Data 48PG 1750 Fig. 6 - Alignment Hole Location Step 5 - Make Unit Duct ConnectionsFig. 5 - Alignment Hole Details Fig. 8 - Air Distribution - Concentric DuctFig. 9 - Concentric Duct Details Step 6 - Install Flue Hood and Inlet HoodFig. 11 - Combustion Fan Housing Location Fig. 10 - Flue and Inlet Hood LocationsFig. 13 - Condensate Drain Piping Details Step 9 - Make Electrical ConnectionsFig. 12 - Condensate Drain Details Fig. 14 - Field Gas PipingFig. 17 - Outdoor-AirHood Component Fig. 15 - Field Power Wiring ConnectionsFig. 16 - Field Control Thermostat Wiring Shipping LocationCOMPRESSOR 10.6 LEGEND AND NOTES FOR TABLES 4A AND 4B Fig. 18 - Outdoor-AirHood DetailsFig. 19 - Outdoor-AirHood Assembled Fig. 20 - Manual Damper DetailsFig. 22 - Bracket and Hood Positioning PRE-START-UP 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 25 - Evaporator Fan Motor Specifications Table 24 - Operation Air Quantity LimitsHD60FK651 Table 27 - Fan Rpm at Motor Pulley Settings Table 28 - EconoMi$er IV Sensor Usage Fig. 25 - Temperature Changeover Set PointsFig. 24 - Sensor Locations OAT and MAT Fig. 26 - EconoMi$er IV Wiring and LED Locations APPROXIMATE DRY BULB TEMPERATURE- F CFig. 27 - Enthalpy Changeover Set Points 13B CTO x OA + TR x RA = TM Table 29 - CO2 Sensor Standard Settings Operating SequenceFig. 30 - Subcooler Operation SERVICE What to do if you smell gasFig. 31 - Typical Gas Heating Section LubricationFig. 32 - Removing Heat Exchanger Ceramic Baffles and ClipsFig. 33 - Evaporator-FanMotor Adjustment Fig. 34 - Evaporator-FanAlignment and AdjustmentFig. 35 - Condenser-FanAdjustment Condenser-FanAdjustment FigTable 30 - Belt Tension Adjustment Table 31 - Sensor Temperature/Resistance ValuesFig. 38 - Charging Chart - 48PG24 Gas Valve AdjustmentFig. 37 - Charging Chart - 48PG20 Fig. 39 - Charging Chart - 48PG28Fig. 41 - Spark Gap Adjustment Fig. 40 - Gas ValveProtective Devices Table 32 - Altitude CompensationFig. 42 - Typical Low Voltage Control Schematic Fig. 43 - Typical Power Schematic Page Fig. 45 - Typical Component Arrangement - 48PG28 LEGEND FOR FIGLEGEND TXV - Thermostatic Expansion Valve TROUBLESHOOTINGTable 33 - Cooling Service Analysis Poor Flame Characteristics Table 34 - Gas Heating Service AnalysisPROBLEM CAUSEIGC - Integrated Gas Unit Controller Fig. 46 - IGC Control Heating and CoolingLEGEND IDM - Induced-DraftMotor EconoMi$er IV Troubleshooting Table 35 - IGC Board LED Alarm CodesMIXED-AIRINPUT - To check mixed-airinput Copyright 2005 Carrier Corporation Page I. PRE-START-UP UNIT START-UPCHECKLISTTEMPERATURES II.START-UP