Armstrong Air 4SCU 16 LS Series User Manual

507607-03 Issue 1827 Page 1 of 23
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INSTALLATION INSTRUCTIONS
4SCU 16 LS SERIES
Split System Air Conditioner
(P) 507607-03
*P507607-03*
Manufactured By
Allied Air Enterprises LLC
A Lennox International, Inc. Company
215 Metropolitan Drive
West Columbia, SC 29170
This manual must be left with the homeowner for future reference.
This is a safety alert symbol and should never be ignored. When you see this symbol on labels or in
manuals, be alert to the potential for personal injury or death.
The equipment covered in this manual is to be installed
by trained and experienced service and installation
technicians. Improper installation, modication, service,
or use can cause electrical shock, re, explosion, or
other conditions which may cause personal injury,
death, or property damage. Use appropriate safety gear
including safety glasses and gloves when installing this
equipment.
WARNING
Risk of electrical shock. Disconnect all remote power
supplies before installing or servicing any portion of the
system. Failure to disconnect power supplies can result
in property damage, personal injury, or death.
WARNING
Installation and servicing of air conditioning equipment
can be hazardous due to internal refrigerant pressure
and live electrical components. Only trained and
qualied service personnel should install or service
this equipment. Installation and service performed by
unqualied persons can result in property damage,
personal injury, or death.
WARNING
Sharp metal edges can cause injury. When installing
the unit, use care to avoid sharp edges.
WARNING
Table of Contents
Installation ...................................................................2
Electrical Wiring ...........................................................3
Start-Up .....................................................................11
Operation ...................................................................14
Seven-Segment Alert and System Status Codes ......14
Maintenance ..............................................................20
Homeowner Information ............................................21

Armstrong Air 4SCU 16 LS Series Specifications

General

Brand	Armstrong Air
Model	4SCU 16 LS Series
Category	Air Conditioner
Language	English

Summary

Installation Procedures

General Installation and Inspection

Read instructions, follow codes, inspect shipment.

Unit Placement and Mounting

Guidance on location, slab mounting, and roof mounting.

Electrical Wiring and Controls

Requirements for field wiring, grounding, and thermostat connections.

Refrigerant Line Set Installation

Procedures for line set isolation, brazing, and piping.

Flushing Existing Line Set and Indoor Coil

Steps to flush existing lines and coils before installing new unit.

Leak Testing and Evacuation

Procedures for leak detection and system evacuation.

Start-Up and Charging Procedures

Pre-Start Checks and Voltage Verification

Rotate fan, inspect wiring, check voltage before starting.

Refrigerant Charging Methods

Detailed procedures for weighing, subcooling, and approach methods.

System Operation and Status

Basic Operation and Special Functions

Unit cycling, crankcase heater, emergency heat, time delay.

Seven-Segment Alert and System Status Codes

Understanding seven-segment display codes and system alerts.

Error Code Recall and Configuration

Accessing error history, recall modes, and configuring unit settings.

Maintenance and Homeowner Information

Routine Maintenance Checks

Pre-season checks, cleaning coils, filters, and checking components.

Homeowner Care and Filter Management

Filter maintenance, outdoor coil cleaning, and system care.

Start-Up and Performance Checklist