48HC

Single Package Rooftop

Gas Heating/Electric Cooling Unit

with Puronr(R---410A) Refrigerant

Sizes: 17, 20, 24, 28

Installation Instructions
NOTE: Readthe entire instructionmanual before starting
the installation

TABLE OF CONTENTS

SAFETY CONSIDERATIONS 2....................
INSTALLATION 9...............................
Jobsite Survey 9................................
Step1 -- Plan for Unit Location 9..................
Roof Mount 9...............................
Step 2 --Plan for Sequence of Unit Installation 10.....
Curb--MountInstallation 10....................
Pad--MountInstallation 10.....................
Frame--MountInstallation 10...................
Step3 -- Inspect Unit 10..........................
Step 4 --Provide Unit Support 10..................
Roof Curb Mount 10.........................
Slab Mount (Horizontal Units Only) 10..........
Alternate Unit Support
(In Lieu of Curb or Slab Mount) 10.............
Step5 -- Field Fabricate Ductwork 14...............
Step6 -- Rig and Place Unit 14....................
Positioning on Curb 15.......................
Step 7 --Horizontal Duct Connection 15............
Step 8 --Install Outside Air Hood — FactoryOption 15..
Step 9 --Install Flue Hood and Combustion Air Hood 16..
Step 10 --Install Gas Piping 16....................
Gas Supply Line 16..........................
Factory--OptionThru--Base Connections 18.......
Step 11 --Install External Condensate Trap and Line 19..
Step 12 --Make Electrical Connections 19...........
Field Power Supply 19........................
Units without Factory--InstalledDisconnect 20....
Unitswith Factory--Installed Disconnect 20.......
All Units 20................................
Convenience Outlets 20.......................
Factory--OptionThru--Base Connections 22......
Units without Thru--BaseConnections 22.........
Field ControlWiring 22.......................
Thermostat 22...............................
Unit without Thru--BaseConversion Kit 22.......
Heat AnticipatorSettings 23...................
Transformer Connection
for 208--vPower Supply 23.....................
Humidi--MiZerRControl Connections 24..........
Humidi--MiZer --Space RH Controller 24........
PremierLinkt(FactoryOption) 26...............
Supply Air Temperature (SAT)Sensor 29.........
Outdoor Air Temperature (OAT)Sensor 29.......
EconoMi$er2 29.............................
Field Connections 29..........................
Space Sensors 31............................
Connect Thermostat 31.......................
Configure the Unit for Thermostat Mode 31......
Economizer Controls 32........................
Indoor Air Quality (CO2)Sensor 32.............
Outdoor Air Quality Sensor 32.................
Space Relative HumiditySensor or
HumidistatConnections 33....................
Smoke Detector/Fire Shutdown (FSD) 34.........
Filter StatusSwitch 34........................
Supply Fan Status Switch 34...................
Remote OccupiedSwitch 34...................
Power Exhaust (output) 34.....................
CCN Communication Bus 35..................
RTUOpen Control System 36...................
Supply Air Temperature (SAT)Sensor 39.........
Outdoor Air Temperature (OAT)Sensor 39.......
EconoMi$er2 39.............................