Startup - Lennox LGH 036 Installation Instructions Manual

M2 unit controller LED indicators
Some indicators on the circuit board are visible with the cover in place; others are not. The indicators and their meanings are
described in table 1.
LED Status Indication
GREEN SLOW FLASH
Heartbeat
GREEN FAST FLASH
UNLIT STEADY OFF
GREEN STEADY ON
OAS
GREEN STEADY ON
(Note: LED is
not present in
the newer M2 GREEN FLASHING
hardware.
PC LOCAL
FLICKERING ON
(YELLOW)
Connection
NETWORK
FLICKERING ON
(GREEN)
S-BUS BUS (GREEN) FLICKERING ON
TX (YELLOW) FLICKERING ON
RX (GREEN) FLICKERING ON
BACnet
(option)
TX (YELLOW) FLICKERING ON

Startup

Connections between RTU & M2 unit controller
The M2 unit controller connects to the rooftop unit using
SmartWiret connectors. Each connector is "keyed" so that
no connector can be installed in the wrong location. Be sure
all connectors are in place and completely inserted (see
figure 1).
Sensor Common Isolation
Thermostat (TSTAT) and humidity (HUM) sensor commons
may be isolated if they are powered remotely. Slide switch to
OPEN to isolate (see figure 1).
USB interface usage
The USB port is used for verifying service, downloading
reports, transferring unit profiles and performing firmware
updates. Onsite data collection requires use of a USB flash
drive. Data written to the drive includes date, time, serial
number, catalog number, basic data, error code buffer, and
unit configuration.
PC interface
The PC interface is used with unit controller software to
change programming. The M2 interface uses a USB A to B
male cable. You may also use a 9 pin/RS485 connection to
the phone jack or S-BUS connector. A list of service
connection kits is on Page 26.
SmartWire™ Field Wiring Connections
The SmartWire™ connectors, P297, P298 and P299, allow
Table 1. LED operation indications
Meaning LED
LonTalk
NORMAL OPERATION
(option)
CHECK 24V, UPDATE FIRM­
WARE, OR REPLACE BOARD
NO VOLTAGE TO M2 BOARD
OR DEFECTIVE BOARD
DEFECTIVE BOARD (REPLACE)
OUTSIDE AIR IS SUITABLE
IAQ MODE OR MECHANICAL
COOLING DURING FREE COOL­
ING
Thermostat
Input
COMMUNICATION TO PC USB
CONNECTOR
NETWORK COMMUNICATION
Thermostat LEDs indicate only with incoming thermostat connection vis
SmartWire connector.
NETWORK TRAFFIC PRESENT
Slow Flash = 1 sec on; 1 sec off.
M2 IS TRANSMITTING
Fast Flash = 1 msec on; 1 msec off.
M2 IS RECEIVING
A "flickering" LED flashes significantly faster than a "fast flash".
M2 IS TRANSMITTING
NOTE - LEDs are energized by 24 vac thermostat inputs.
for easy field wiring connection points.
2-amp fuse or wire jumper
The 24VAC supply outputs, (R), on these connectors are
routed through the 2-amp fuse, F1, on earlier boards or a
wire jumper on later boards.
TSTAT COM switch (earlier boards) OR
TSTAT COM wire jumpers (later boards)
TSTAT COM is located to the left of P297. This switch would
be set to the LEFT or the wire jumpers would be cut only in
unique situations where the device supplying the thermostat
signals to the Prodigy
and does not share a common reference voltage with the
Prodigy controller. Otherwise the switch needs to be set to
the default, closed position, to the RIGHT and the wire
jumper would remain intact, as shipped from the factory.
HMD COM switch (earlier boards) OR
HMD COM wire jumpers (later boards)
HMD COM is located to the left of P299. This switch would
be set to the RIGHT or the wire jumpers would be cut only in
unique situations where the device supplying the thermostat
signals to the Prodigy controller has its own power source
and does not share a common reference voltage with the
Prodigy controller. Otherwise the switch needs to be set to
the default, closed position, to the LEFT and the wire jumper
would remain intact, as shipped from the factory.
Page 4
Status Indication Meaning
RX (GREEN) FLICKERING ON M2 IS RECEIVING
TX (YELLOW) FLICKERING ON M2 IS TRANSMITTING
SERVICE FLASHING 1 SEC. NODE IS NOT CONFIGURED;
(RED) ON; 1 SEC. OFF APPLICATION LOADED
SERVICE NODE IS COMPLETELY CON­
STEADY OFF
(UNLIT) FIGURED
SERVICE NODE IS CONFIGURED; NO AP­
CONSTANT ON
(RED) PLICATION LOADED
QUICK FLASHES
SERVICE MESSAGES BEING PASSED TO
DURING
(RED) M2; NORMAL OPERATION
INITIALIZATION
YELLOW INDICATES A G-
THERMOSTAT W1-
DEMAND W2-
Y1-
Y2-
OCP- OCCUPIED
®
controller has its own power source
BLOWER ON
1ST STAGE HEAT
2ND STAGE HEAT
1ST STAGE COOL
2ND STAGE COOL