Lennox Core Unit Controller - CORE Unit Controller Overview; Lennox CORE Service App Requirements; CORE Unit Controller Additional Features; Configurable Sequences of Operation

3
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efciency,andprotectyourinvestments.The
CORE Unit Controller is a microprocessor-based controller
thatprovidesexiblecontrolofallunitfunctions.
Lennox
®
CORE Service App Connectivity
• Setup menu insures proper installation and simplied
setup of the rooftop unit
• Detailed data readout updates sensor values in real time
and allows trending
• Unit self-test veries 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 6.0 (Marshmallow) or higher.
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eld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rmwareupdates
NOTE: Unit Internet Connection required for rmware
update only and not for BACnet IP.
• Prolesetupcopieskeysettingsbetweenunitswiththe
sameconguration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. Congurable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)
• 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
• Congurable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
®
+ Operation (Variable Capacity Hot-Gas
Reheat)
• Enhanced Dehumidication (Latent Demand Control
without reheat)
1.4. Component Protection / Unit
Safeguards
• Compressor Time-Off Delay
• Adjustable Blower On/Off Delay
• 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