Core Unit Controller Overview; Device Minimum System Requirements; Additional Features; Configurable Sequences Of Operation - Lennox Core Unit Controller Setup Manual

1. CORE Unit Controller Overview

For all available CORE Control System documentation, go
to the Lennox Commercial website.
www.lennoxcommercial.com
The Lennox Core Unit Controller is a multi-processor-
based controller. Standard with all Model L™ rooftop units,
integrates key technologies that lower installation costs,
drive system efficiency, and protect your investments. The
CORE Unit Controller is a microprocessor-based controller
that provides flexible control of all unit functions.
Lennox CORE Service App Connectivity
®
• Setup menu insures proper installation and simplified
setup of the rooftop unit
• Detailed data readout updates sensor values in real time
and allows trending
• Unit self-test verifies individual critical component and
system performance
• Economizer test function ensures economizer is
operating correctly
1.1. Lennox CORE Service App - Android
®
or iOS Device Minimum System
Requirements
• Android hardware requires 2GB RAM and 2GHz Core
processor. Tablets are supported.
• Minimum Android
Recommend Android 10 and Apple products require IOS
version 11 or higher.
1.2.

Additional Features

• Built-In 7-segment display (four character positions) the
unit status and active alarms for easy troubleshooting
• Buttons for test and clearing delays
• SmartWire™ System with keyed and removable screw
terminals ensure correct field wiring
• Built-in BACnet IP and MS/TP allow open integration to
building management systems
• Two-port Ethernet Switch enables daisy chaining for
BACnet IP and automatic firmware updates
NOTE:
Unit Internet Connection required for firmware
update only and not for BACnet IP.
• Profile setup copies key settings between units with the
same configuration to reduce setup time
• USB port allows a technician to download and transfer
unit information to help verify service was performed
• USB software updates on the CORE™ Unit Controller
enhance functionality without the need to change
components
1.3. Configurable Sequences of
Operation
• Single-Zone VAV (Discharge Control) Cooling (With
room sensor or 24V DDC)
• Three Cooling Stages (With compatible thermostat or
DDC / additional relay)
6.0 (Marshmallow) or
• Four Heating Stages using a room sensor (up to two
with thermostat / DDC Controls)
• Four stages in VAV/Discharge Air Control with thermostat
input to W1
• Multi-Zone VAV (Discharge Control) Heating and Cooling
• Economizer Control Options (See Economizer / Exhaust
Air / Outdoor Air sections)
• Exhaust Fan Control Modes for fresh air damper position
• Configurable morning warm-up and morning cool-down
• Night Setback Mode
• Fresh Air Tempering for improved space temperature
control during ventilation'
• Demand Control Ventilation
• Low Ambient Controls for operation down to 0°F
• Humiditrol
®
Reheat)
• Enhanced Dehumidification (Latent Demand Control
without reheat)
1.4. Component Protection / Unit
Safeguards
• Compressor Time-Off Delay
• Adjustable Blower On/Off Delay
higher.
• Return Air Temperature Limit Control
• Safety Switch Input allows Controller to respond to a
external safety switch trip
• Service Relay Output
• Thermostat Bounce Delay
• Smoke Alarm Mode has four choices (unit off, positive
pressure, negative pressure, purge)
• "Strike Three" Protection
• Gas Valve Time Delay Between First and Second Stage
• Minimum Compressor Run Time
1.5.

Control Methods / Interfaces

• DDC and 24V Thermostat
• BACnet (MS/TP) and IP
• LONTalk (Factory & Field Option)
• Lennox S-BUS
• Compatibility with Lennox Wireless Zone Sensors
• Zone Temperature Sensor input
• Dehumidistat & Humidity Sensor inputs
• Indoor Air Quality Inputs (2)
• One IAQ input is report only.
• Built-in Control Parameter Defaults
• Permanent Diagnostic Code Storage
• Field Adjustable Control Parameters (Over 200 settings)
• Dirty Filter Switch Input
3
+ Operation (Variable Capacity Hot-Gas