581J
SINGLE PACKAGE ROOFTOP
GAS HEATING/ELECTRIC COOLING UNIT
SIZES 07, 08, 09, 11, 12 WITH PURON
R
(R−410A) REFRIGERANT
Installation Instructions
NOTE: Read the entire instruction manual before starting
the installation
TABLE OF CONTENTS
SAFETY CONSIDERATIONS 2....................
Rated Indoor Airflow (cfm) 3.....................
INSTALLATION 8...............................
Jobsite Survey 8................................
Step 1 − Plan for Unit Location 8..................
Roof Mount 9...............................
Step 2 − Plan for Sequence of Unit Installation 9......
Curb−Mounted Installation 9...................
Pad−Mounted Installation 9....................
Frame−Mounted Installation 9..................
Step 3 − Inspect Unit 9...........................
Step 4 − Provide Unit Support 9...................
Roof Curb Mount 9..........................
Slab Mount (Horizontal Units Only) 11..........
Alternate Unit Support
(In Lieu of Curb or Slab Mount) 11.............
Step 5 − Field Fabricate Ductwork 11...............
Step 6 − Rig and Place Unit 11....................
Positioning on Curb 12.......................
Step 7 − Convert to Horizontal & Connect Ductwork 12.
Step 8 − Install Outside Air Hood 13...............
Economizer and Two Position Damper Hood
Package Removal and Setup — Factory Option 13..
Economizer Hood and Two−Position Hood 13.....
Step 9 − Install Flue Hood 14.....................
Step 10 − Install Gas Piping 14....................
Factory−Option Thru−Base Connections
(Gas Connections) 15.........................
Step 11 − Install External Condensate Trap and Line 17..
Step 12 − Make Electrical Connections 17...........
Field Power Supply 17........................
Units with Factory−Installed
Non−Fused Disconnect 18.....................
Units without Factory−Installed
Non−Fused Disconnect 19.....................
All Units 19................................
Convenience Outlets 19.......................
Factory−Option Thru−Base Connections
(Electrical Connections) 21....................
Units without Thru−Base Connections 21.........
Field Control Wiring 21.......................
Thermostat 21...............................
Unit without Thru−Base Connection Kit 21.......
Heat Anticipator Settings 22...................
Low Ambient Control (Factory Option) 22...........
Variable Frequency Drive (VFD) 2−Speed Indoor Fan
Motor System (Factory Option) 22..................
EconoMi$er X − Ultra Low Leak Economizer
(Factory Option) 22.............................
Perfect Humidityt System Control Connections 22..
Perfect Humidity System − Space RH Controller 22..
RTU Open Controller System 24.................
Supply Air Temperature (SAT) Sensor 27.........
Outdoor Air Temperature (OAT) Sensor 27.......
EconoMi$er2 28.............................
Field Connections 28..........................
Space Temperature (SPT) Sensors 28............
Indoor Air Quality (CO
2
) Sensor 29.............
Outdoor Air Quality Sensor 29.................
Space Humidity Sensor or Humidistat 30.........
Smoke Detector/Fire Shutdown (FSD) 31.........
Connecting Discrete Inputs 31..................
Communication Wiring − Protocols 32............
General 32.................................
Local Access 33..............................
RTU Open Controller Troubleshooting 33........
Outdoor Air Enthalpy Control 34.................
Differential Enthalpy Control 34................
Return Air Enthalpy Sensor 34.................
Smoke Detectors 35...........................
Step 13 − Adjust Factory−Installed Options 41........
Step 14 − Install Accessories 41...................
START−UP CHECKLIST 43.......................
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