Contents
CONTENTS
Installation Instructions
SAFETY CONSIDERATIONS
INSTALLATION Step 1 Ð Provide Unit Support
Fig. 1 Ð Roof Curb and Horizontal Adapter Details
ACCESSORY
CURB
DESCRIPTION
Fig. 2 Ð Horizontal Supply/Return Curb
Dimension A
and Horizontal Adapter Details
Instructions continued on page
Table 1 Ð Physical Data
Fig. 4 Ð Base Unit Dimensions, 48HJ015,017
Fig. 5 Ð Base Unit Dimensions, 48HJ025
48HJ017 and 025 Shown
Fig. 6 Ð Air Distribution Ð Through-the-Bottom
Fig. 7 Ð Concentric Duct Air Distribution
48HJ017 and 025 Shown
Fig. 11 Ð Condensate Drain Details
Fig. 10 Ð Combustion Fan Housing Location
Fig. 12 Ð Condensate Drain Piping Details
Fig. 13 Ð Field Gas Piping
Fig. 14 Ð Field Power Wiring Connections
Step 8 Ð Make Electrical Connections
Table 2 Ð Electrical Data
Fig. 15 Ð Field Control Thermostat Wiring
Step 9 Ð Make Outdoor-AirInlet Adjustments
Fig. 16 Ð 25% Outdoor-AirSection Details
Fig. 19 Ð Economizer Motor Control
Fig. 17 Ð Economizer Damper Assembly Ð End View
Module Location
Fig. 20 Ð Outdoor-AirHood Component Location
START-UP
AIRFLOW
AIRFLOW
Table 4 Ð Fan Performance Data, 48HJ017 Units
Power Exhaust
Fig. 24 Ð Fan Performance Using Accessory
Table 5 Ð Fan Performance Data, 48HJ025 Units
Table 6 Ð Air Quantity Limits
Base Unit Operation
48HJE015, 48HJE017, and 48HJD025 Shown
Fig. 25 Ð Typical Gas Heating Section
Fig. 26 Ð Typical Heating Section With
Main Burners Removed
Fig. 29 Ð 48HJ015 Evaporator-Fan Motor Adjustment
Fig. 28 Ð Evaporator-FanAlignment and Adjustment
Evaporator Fan, 48HJ015 Units
Evaporator Fan, 48HJ017,025 Units
Condenser-FanAdjustment
Belt Tension Adjustment Ð To adjust belt tension
Motor Section Fig. 31 Ð Condenser Fan Adjustment
48HJ015,017 Fig. 32 Ð Condenser-FanAdjustment
Fig. 33 Ð Cooling Charging Chart, 48HJ015
Table 8 Ð Economizer Checkout Procedures
Table 9 Ð High and Low Outdoor-AirTemperature
Gas Valve Adjustment
Pilot Adjustment
Fig. 34 Ð Cooling Charging Chart, 48HJ017
Fig. 35 Ð Cooling Charging Chart, 48HJ025
Protective Devices
Fig. 38 Ð Typical Wiring Schematic 48HJ025 Shown
Page
Page
LEGEND FOR FIG. 38 and
Page
Page
PACKAGED SERVICE TRAINING
Page
ELECTRICAL
START-UPCHECKLIST
TEMPERATURES
PRESSURES
