Installation Instructions
50LC
WeatherExpert
R
Series
Single Package Rooftop
Cooling Only
with Puronr (R---410A) Refrigerant
Size: 07
NOTE: Read the entire instruction manual before starting
the installation.
TABLE OF CONTENTS
SAFETY CONSIDERATIONS 2....................
Rated Indoor Airflow (cfm) 3.....................
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--Mounted Installation 7...................
Pad--Mounted Installation 7....................
Frame--Mounted Installation 7..................
Step 3 -- Inspect Unit 7...........................
Step 4 -- Provide Unit Support 7...................
Roof Curb Mount 7..........................
Slab Mount (Horizonta l Units Only) 7...........
Alternate Unit Support
(In Li eu of Curb or Sla b Mount) 7..............
Step 5 -- Field Fabricate Ductwork 9................
For Units with Accessory or
Optional Electric Heaters 9....................
Step 6 -- Rig and Place Unit 9.....................
Positioning on Curb 9........................
Step 7 -- Convert to Horizontal and Connect
Ductwork 10...........................
Step 8 -- Install Outside Air Hood 11...............
Economizer Hood Package Removal and Setup
—FactoryOption 11.........................
Economizer Hood 11.........................
Step 9 -- Install External Condensate Trap and Line 12.
Step 10 -- Make Electrical Connections 12...........
Field Power Supply 12........................
Units W ith Factory--Installed
Non--Fused Disconnect or HACR 19..............
Units Without Fact ory--Installed
Non--Fused Disconnect or HACR 20.............
All Units 20................................
Convenie nce Outlets 20.......................
HACR 22..................................
Factory--Option Thru--Base Connections 22......
Units Without Thru--Base Connections 22........
Field Control Wiring 22.......................
Thermostat 22...............................
Unit Without Thru--Base Connection Kit 23.......
Heat Anticipator Settings 23...................
Electric Heaters 23............................
Single Point Boxe s and Supplementary Fuses 24...
Single Point Boxe s without Fuses 24............
Low--Voltage Control Connections 24............
Humidi--MiZer
R
System Control Connections 25....
Humidi--MiZer System -- Space RH Controller 25..
RTU Open Controller (Factory--Installed Option) 25...
SystemVut Controller (Factory--Installed Option) 25..
Integrated Staging Control (ISC) Board 26...........
ISC Board — Sequence of Operation 26...........
General 26.................................
Ventilation 26...............................
Cooling 27.................................
Humid i--MiZer Sys tem (Option al) 27.............
Economizer (Optional) 27.....................
Low Ambient Cooling Operation
Down to 40_F(4_C) 28.......................
Heating 28.................................
EconoMi$e r
R
X (Factory--Installed Option) 28.......
Unit Installation 28..........................
Enthalpy Sensor Relocation 28.................
W7220 Economizer Controller 28................
User Interface 29............................
Keypad 29.................................
Menu Structure 29.............................
Connect ions and Applications 34.................
W7220 Economizer Module Wiring 34..........
Economizer Control Configurations 35............
Enthalpy Changeover Control 35...............
Enthalpy Settings 35.........................
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