48LC
Single Package Rooftop
Gas Heating/Electric Cooling Unit
with Puronr (R---410A) Refrigerant
Sizes: 04, 05, 06
Installation Instructions
NOTE: Read the entire instruction manual before starting
the installation
TABLE OF CONTENTS
SAFETY CONSIDERATIONS 2....................
INSTALLATION 6...............................
Jobsite Survey 6................................
Step 1 -- Plan for Unit Location 6..................
Roof Mount 6...............................
Step 2 -- Plan for Sequence of Unit Installation 7......
Curb--Mount Installation 7.....................
Pad--Mount Installation 7......................
Frame--Mount Installation 7....................
Step 3 -- Inspect Unit 7...........................
Step 4 -- Provide Unit Support 7...................
Roof Curb Mount 7..........................
Slab Mount (Horizontal Units Only) 7...........
Alternate Unit Support
(In Lieu of Curb or Slab Mount) 7..............
Step 5 -- Field Fabricate Ductwork 9................
Step 6 -- Rig and Place Unit 9.....................
Positioning on Curb 9........................
Step 7 -- Convert to Horizontal and Connect
Ductwork 11............................
Step 8 -- Install Outside Air Hood 11...............
Economizer Hood Package Removal and Setup —
Factory Option 11............................
Economizer Hood 12.........................
Step 9 -- Units with Hinged Panels Only 12..........
Step 10 -- Install Flue Hood 13....................
Step 11-- Install Gas Piping 13.....................
Factory--Option Thru--Base Connections
(Gas Connections) 14.........................
Step 12 -- Install External Condensate Trap and Line 16..
Step 13 -- Make Electrical Connections 16...........
Field Power Supply 16........................
Units with Factory--Installed Non--Fused
Disconnect or HACR 23......................
Units without Factory--Installed Non--Fused
Disconnect or HACR 24......................
All Units 24................................
Convenience Outlets 24.......................
HACR 26..................................
Factory--Option Thru--Base Connections
(Electrical Connections) 26....................
Units without Thru--Base Connections 26.........
Field Control Wiring 26.......................
Thermostat 26...............................
Unit without Thru--Base Connection Kit 27.......
Heat Anticipator Settings 27...................
Humidi--MiZer
R
Control Connections 27..........
Humidi--MiZer -- Space RH Controller 27........
EconoMi$er X (Factory Option) 29...............
ComfortLINK (Factory Option) 29...............
RTU Open Control System 31...................
Supply Air Temperature (SAT) Sensor 34.........
Outdoor Air Temperature (OAT) Sensor 35.......
EconoMi$er2 35.............................
Field Connections 35..........................
Space Temperature (SPT) Sensors 35............
Indoor Air Quality (CO
2
)Sensor 36.............
Outdoor Air Quality Sensor 37.................
Space Humidity Sensor or Humidistat 37.........
Smoke Detector/Fire Shutdown (FSD) 38.........
Connecting Discrete Inputs 38..................
Communication Wiring -- Protocols 39............
General 39.................................
Local Access 40..............................
RTU Open Troubleshooting 40.................
Outdoor Air Enthalpy Control 41.................
Differential Enthalpy Control 41................
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