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48PG20-28 specifications Typical Low Voltage Control Schematic
Models:
48PG20-28
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Troubleshooting
Poor Flame Characteristics
Dimension
EconoMi$er IV Wiring
Condenser-FanAdjustment Fig
Checklist
Service
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Fig. 42 — Typical Low Voltage Control Schematic
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Contents
SAFETY CONSIDERATIONS
Installation, Start-Upand Service Instructions
CONTENTS
INSTALLATION Step 1 - Provide Unit Support
Fig. 1 - Roof Curb Details
SHIPPING RAILS
Fig. 2 - Shipping Rail Removal
Fig. 3 - Rigging Details
Fig. 4 - Base Unit Dimensions
Table 1 - Physical Data
48PG
1750
Fig. 5 - Alignment Hole Details
Step 5 - Make Unit Duct Connections
Fig. 6 - Alignment Hole Location
Fig. 8 - Air Distribution - Concentric Duct
Fig. 11 - Combustion Fan Housing Location
Step 6 - Install Flue Hood and Inlet Hood
Fig. 9 - Concentric Duct Details
Fig. 10 - Flue and Inlet Hood Locations
Fig. 12 - Condensate Drain Details
Step 9 - Make Electrical Connections
Fig. 13 - Condensate Drain Piping Details
Fig. 14 - Field Gas Piping
Fig. 16 - Field Control Thermostat Wiring
Fig. 15 - Field Power Wiring Connections
Fig. 17 - Outdoor-AirHood Component
Shipping Location
COMPRESSOR
10.6
Fig. 18 - Outdoor-AirHood Details
LEGEND AND NOTES FOR TABLES 4A AND 4B
Fig. 20 - Manual Damper Details
Fig. 19 - Outdoor-AirHood Assembled
Fig. 22 - Bracket and Hood Positioning
START-UP
PRE-START-UP
3.Connect pressure gage to manifold pressure tap
AIRFLOW
AIRFLOW
AIRFLOW
AIRFLOW
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AIRFLOW
AIRFLOW
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AIRFLOW
AIRFLOW
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AIRFLOW
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Page
AIRFLOW
AIRFLOW
GENERAL NOTES FOR FAN PERFORMANCE DATA TABLES
Table 24 - Operation Air Quantity Limits
Table 25 - Evaporator Fan Motor Specifications
HD60FK651
Table 27 - Fan Rpm at Motor Pulley Settings
Table 28 - EconoMi$er IV Sensor Usage
Fig. 24 - Sensor Locations OAT and MAT
Fig. 25 - Temperature Changeover Set Points
Fig. 26 - EconoMi$er IV Wiring
and LED Locations
Fig. 27 - Enthalpy Changeover Set Points
13B C
D C B A
TO x OA + TR x RA = TM
Operating Sequence
Table 29 - CO2 Sensor Standard Settings
Fig. 30 - Subcooler Operation
What to do if you smell gas
SERVICE
Fig. 32 - Removing Heat Exchanger Ceramic
Lubrication
Fig. 31 - Typical Gas Heating Section
Baffles and Clips
Fig. 34 - Evaporator-FanAlignment and Adjustment
Fig. 33 - Evaporator-FanMotor Adjustment
Table 30 - Belt Tension Adjustment
Condenser-FanAdjustment Fig
Fig. 35 - Condenser-FanAdjustment
Table 31 - Sensor Temperature/Resistance Values
Fig. 37 - Charging Chart - 48PG20
Gas Valve Adjustment
Fig. 38 - Charging Chart - 48PG24
Fig. 39 - Charging Chart - 48PG28
Fig. 40 - Gas Valve
Fig. 41 - Spark Gap Adjustment
Table 32 - Altitude Compensation
Protective Devices
Fig. 42 - Typical Low Voltage Control Schematic
Fig. 43 - Typical Power Schematic
Page
LEGEND FOR FIG
Fig. 45 - Typical Component Arrangement - 48PG28
LEGEND TXV - Thermostatic Expansion Valve
TROUBLESHOOTING
Table 33 - Cooling Service Analysis
PROBLEM
Table 34 - Gas Heating Service Analysis
Poor Flame Characteristics
CAUSE
IGC - Integrated Gas Unit Controller
Fig. 46 - IGC Control Heating and Cooling
LEGEND IDM - Induced-DraftMotor
Table 35 - IGC Board LED Alarm Codes
EconoMi$er IV Troubleshooting
MIXED-AIRINPUT - To check mixed-airinput
Copyright 2005 Carrier Corporation
Page
I. PRE-START-UP
UNIT START-UPCHECKLIST
II.START-UP
ELECTRICAL
