Table of Contents
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SERVICE MANUAL
NS23AM
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.
WARNING
Improper installation, adjustment, alteration, service or
maintenance can cause property damage, personal injury
or loss of life. Installation and service must be performed
by a licensed professional HVAC installer or equivalent,
service agency, or the gas supplier.
WARNING
To prevent serious injury or death:
Lock-out/tag-out before performing maintenance.
If system power is required (e.g., smoke detector
maintenance), disable power to blower, remove fan
belt where applicable, and ensure all controllers
and thermostats are set to the "OFF" position before
performing maintenance.
Always keep hands, hair, clothing, jewelry, tools, etc.
away from moving parts.
Table of Contents
Typical Unit Parts Arrangement ...................................6
General Information .....................................................9
Operating Gauge Set and Service Valves ...................9
Installation .................................................................10
New or Replacement Line Set ...................................12
Electrical - Circuit Sizing and Wire Routing ...............23
Outdoor Unitary Control.............................................27
Unit Operation ...........................................................28
Servicing Units Delivered Void of Charge..................31
Start-Up .....................................................................31
System Operation and Service ..................................32
Unit Selection Code for Outdoor Control ...................47
.........................................................51
System Overview.......................................................52
Maintenance ..............................................................52
Unit Wiring Diagram ..................................................54
Unit Sequence of Operation ......................................55
Component Testing ....................................................58
System Refrigerant ....................................................91
Charge Mode Jumper ................................................91
expanded ratings, visit www.AHRIdirectory.org. Coils
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31-5000746 Rev. 0
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