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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.
Table 1. LED operation indications
LED Status Indication Meaning
Heartbeat
GREEN SLOW FLASH NORMAL OPERATION
GREEN FAST FLASH CHECK 24V, UPDATE FIRM
WARE, OR REPLACE BOARD
UNLIT STEADY OFF NO VOLTAGE TO M2 BOARD
OR DEFECTIVE BOARD
GREEN STEADY ON DEFECTIVE BOARD (REPLACE)
OAS
(Note: LED is
not present in
the newer M2
hardware.
GREEN STEADY ON OUTSIDE AIR IS SUITABLE
GREEN FLASHING
IAQ MODE OR MECHANICAL
COOLING DURING FREE COOL
ING
PC
Connection
LOCAL
(YELLOW)
FLICKERING ON
COMMUNICATION TO PC USB
CONNECTOR
NETWORK
(GREEN)
FLICKERING ON NETWORK COMMUNICATION
S-BUS
BUS (GREEN) FLICKERING ON NETWORK TRAFFIC PRESENT
TX (YELLOW) FLICKERING ON M2 IS TRANSMITTING
BACnet
(option)
RX (GREEN) FLICKERING ON M2 IS RECEIVING
TX (YELLOW) FLICKERING ON M2 IS TRANSMITTING
LED Status Indication Meaning
LonTalk
(option)
RX (GREEN) FLICKERING ON M2 IS RECEIVING
TX (YELLOW) FLICKERING ON M2 IS TRANSMITTING
SERVICE
(RED)
FLASHING 1 SEC.
ON; 1 SEC. OFF
NODE IS NOT CONFIGURED;
APPLICATION LOADED
SERVICE
(UNLIT)
STEADY OFF
NODE IS COMPLETELY CON
FIGURED
SERVICE
(RED)
CONSTANT ON
NODE IS CONFIGURED; NO AP
PLICATION LOADED
SERVICE
(RED)
QUICK FLASHES
DURING
INITIALIZATION
MESSAGES BEING PASSED TO
M2; NORMAL OPERATION
Thermostat
Input
YELLOW INDICATES A
THERMOSTAT
DEMAND
G- BLOWER ON
W1- 1ST STAGE HEAT
W2- 2ND STAGE HEAT
Y1- 1ST STAGE COOL
Y2- 2ND STAGE COOL
OCP- OCCUPIED
Thermostat LEDs indicate only with incoming thermostat connection vis
SmartWire connector.
Slow Flash = 1 sec on; 1 sec off.
Fast Flash = 1 msec on; 1 msec off.
A “flickering” LED flashes significantly faster than a “fast flash“.
NOTE - LEDs are energized by 24 vac thermostat inputs.
Startup
Connections between RTU & M2 unit controller
The M2 unit controller connects to the rooftop unit using
SmartWire 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
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
®
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 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.
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