Troubleshooting Pcb - Bryant SM03-4 Service Manual

SIZE FEMALE SIZE MALE
M2
T3
T2
SEC1
0.250 X 0.032
SEC2
HUM1
HUM2
AUX1
AUX2
M1
0.187 X 0.032 T1
RED
TABLE 4—CONNECTIONS ON SINGLE BARRIER STRIP MOUNTED, CROSS SLOTTED, CAPTIVE BINDING HEAD (FK4B)
SCREW
TERMINAL
W2 Connection for W2 signal from thermostat
W3 Connection for W3 signal from outdoor thermostat
E Connection for E signal from thermostat
Y/Y2 Connection for Y signal from thermostat
G Connection for G signal from thermostat
O Connection for O signal from thermostat
This connection is a field termination for use in connecting L lines of thermostat and outdoor unit together. There is no
L
connection of this terminal with control circuity.
Y1 Connection for low-speed compressor operation
R Connection for R signal to thermostat (24 vac)
C Connection for C terminal to thermostat (24 vac common)
TYPE
CONNECTION
Heater
Connection
ICM2 Motor
3. A 30 sec on/90 sec off delay profile used when it is
desirable to allow system coils time to heat up/cool down
prior to airflow. This profile will minimize cold blow in
heat pump operation and could enhance system efficiency.
4. ENH, enhanced selection provides a 30 sec on/180 sec off
delay at half airflow, adding comfort and efficiency.
V. TROUBLESHOOTING PCB
Use Fig. 17 and 18 and Tables 3, 4, and 5 as guides in
troubleshooting PCB unless otherwise noted.
TABLE 3—MALE/FEMALE QUICK-CONNECT TERMINALS (FK4B)
Motor line voltage connection (230 vac 60 Hz)
Transformer line voltage connection (230 vac 60 Hz)
Transformer tap storage terminal for 208-vac lead
Secondary connection from transformer (24 vac)
This connection is common to chassis ground through eyelet marked GROUND SCREW REQUIRED.
Secondary connection from transformer (24 vac)
Low voltage ground for humidifier option (24 vdc)
Low voltage output for humidifier option (24 vdc)
Low voltage ground for auxiliary option (24 vdc)
Low voltage output for auxiliary option (24 vdc)
Common connection to blower motor
Common connection for transformer
Common to R screw terminal and SEC2
TABLE 5—CONNECTIONS AND CONNECTOR (FK4B)
TYPE
PIN NO.
CONNECTOR
Pin 1
Pin 2
Pin 3
Pin 4
Pin 5
Pin 6
12-Pin
Pin 7
Pin 8
Pin 9
Pin 10
Pin 11
Pin 12
Pin 1
Pin 2
Pin 3
7-Pin Header Pin 4
Pin 5
Pin 6
Pin 7
DESCRIPTION
DESCRIPTION
Common to E screw terminal
Common to W2 screw terminal
Common to C screw terminal, SEC1 terminal, and chassis ground
Common to C screw terminal, SEC1 terminal, and chassis ground
No connection
Common to W3 screw terminal
Common to M2 and T3 quick-connects, 230 vac input
No connection
Common to M1 and T1 quick-connects, 230 vac input
No connection
No connection
No connection
Diode OR output of E or W3 or W2 thermostat signals
Thermostat G signal
Common to C, SEC1, and chassis ground
Common to C, SEC1, and chassis ground
Common to R and SEC2 (via 5-amp fuse)
Thermostat Y/Y2 signal
Thermostat Y1 signal
A. If Fan Will Not Turn On From Thermostat:
IF THERE IS NO HIGH VOLTAGE TO PCB:
1. Check connection of 12-pin plug from heaters to receptacle
on Easy Select board. This supplies power to PCB. Be sure
plug is connected properly.
2. Check sequencer number 1 and plug wiring. Yellow wire
should be connected to pin number 9 of plug and to limit
switch. Black wire should be connected to pin number 7 of
plug and to sequencer number 1.
—24—
DESCRIPTION