Lennox Core Unit Controller - Connections, Inputs / Outputs, Jumpers, And Leds Locations - Lennox Core Unit Controller Setup Manual

CORE Unit Controller (A55)
J384
J383
J382
J381
4-Character Seven
Segment LED
J380
J379
Duct Sensor
J378
Sensor
IAQ
Figure 1.
• LED Indicators
NOTE:
CORE™ Control System features vary with the
type of rooftop unit in which the control is installed.
1.6. Lennox CORE Unit Controller -
Connections, Inputs / Outputs,
Jumpers, and LEDs Locations
THERMOSTAT COMMON ISOLATION - TSTAT_COM
Jumper
Thermostat (TSTAT) sensor commons are located on
connector P298 and may be isolated if they are powered
remotely. Remove jumper.
This jumper is located to the left of P297 connector. This
jumper would be removed only in unique situations where
the device supplying the thermostat signals to the CORE
Unit Controller has its own power source and does not share
a common reference voltage with the CORE unit controller.
Otherwise the jumper would remain installed across both
pins, as shipped from the factory.
A. HUMIDISTAT COMMON ISOLATION -: HMD_COM
Jumper
The humidity (HUM) sensor commons are located on
connector P298 and may be isolated if they are powered
remotely. Remove jumper. This jumper is located to the right
of P299 connector. This jumper would be removed only in
unique situations where the device supplying the thermostat/
humidistat signals to the CORE Unit Controller has its own
power source and does not share a common reference
voltage with the CORE Unit Controller. Otherwise the jumper
J385
J386 J387
White Push
Button
TX
Black Push
Button
J298
J297
Sensor
Sensor
IAQ Inputs
HUM TMP A12 C R
A11
R + C
Room
Spare
and RH Thermostat
Analog
Service Relays
Sensors
Inputs
Service Relays
Lennox CORE Unit Controller Interfaces and LEDs Locations
Wireless Control (W4)
J388 J389 J390
24VAC
Gnd
24VAC
J299
Humidistat
Smoke
24VAC
P5
Digital
S-BUS
Inputs
Factory Test
would remain installed across both pins, as shipped from the
factory.
b. W4 CONTROL - USb FLASH DRIVE INTERFACE
USAGE
The W4 Control uses a USB type A interface. This USB port is
used for verifying service, downloading reports, transferring
unit profiles and performing firmware updates.
On-site data collection requires use of either a USB flash
drive or download and shared from the CORE Service App.
Data written to the drive includes date, time, serial number,
catalog number, basic data, error code buffer, and unit
configuration.
C. S-bUS (SMARTWIRE™) (J304)
This is the L-connection interface. This is a R485 network
connection with other devices (NCP, comfort sensors, other
RTU, etc.).
D. MODbUS CONNECTION (J413)
This is a TIA-485 serial line over MODBUS (messaging
structure) communication. This connection
multiple components.
E. CORE UNIT CONTROLLER LED INDICATORS
NOTE: See "g. Local Interface - four character seven
segment LED - Status Codes" on page 5 for
further information.
4
J391 J392 J393
J394
Gnd
LONTalk
Module
S-BUS SmartWire™
System J304
J395
J358
P2 Expansion
Card Connection
(C4)
MODBUS
J413
is used for