Carrier 48FC M20 Series Service And Maintenance Instructions page 57

Table 14 — Economizer Module —
Left Hand Terminal Blocks
LABEL TYPE
Top Left Terminal Block
MAT 20k NTC and Mixed Air Temperature Sensor (Polarity
MAT COM Insensitive Connection)
OAT 20k NTC and Outdoor Air Temperature Sensor (Polarity
OAT COM Insensitive Connection)
S-BUS S-BUS Enthalpy Control Sensor
S-BUS (Sylk™ a Bus) (Polarity Insensitive Connection)
Bottom Left Terminal Block
Air Quality Sensor Input (e.g., CO
IAQ 2-10 2-10 vdc
sensor)
IAQ COM COM Air Quality Sensor Common
IAQ 24V 24 vac Air Quality Sensor 24 vac Source
ACT 2-10 2-10 vdc Damper Actuator Output (2-10 vdc)
ACT COM COM Damper Actuator Output Common
ACT 24-v 24 vac Damper Actuator 24 vac Source
NOTE(S):
a. Third-party trademarks and logos are the property of their respective owners.
Table 15 — Economizer Module —
Right Hand Terminal Blocks
LABEL TYPE
Top Right Terminal Blocks
AUX2 I
24 vac IN The first terminal is not used.
Shut Down (SD) or HEAT (W)
Conventional only
OCC
24 vac IN and
Heat Pump Changeover (O-B) in Heat
Pump mode.
E-GND
E-GND Occupied/Unoccupied Input
EXH1
24 vac OUT Exhaust Fan 1 Output
Programmable:
Exhaust fan 2 output
or
AUX1 O
24 vac OUT
ERV
or
System alarm output
Bottom Right Terminal Blocks
Y2 in - Cooling Stage 2 Input from space
Y2-I 24 vac IN
thermostat
24 vac OUT Y2 out - Cooling Stage 2 Output to stage
Y2-O
2 mechanical cooling
Y1 in - Cooling Stage 2 Input from space
Y1-I 24 vac IN
thermostat
Y1 out - Cooling Stage 2 Output to stage
Y1-O 24 vac OUT
2 mechanical cooling
C COM 24 vac Common
R 24 vac 24 vac Power (hot)
S-BUS SENSOR WIRING
The labels on the sensors and controller are color coded for ease of
installation. Orange labeled sensors can only be wired to orange
terminals on the controller. Brown labeled sensors can only be
wired to S-bus (brown) terminals. Use Fig. 76 and Table 16 to lo-
cate the wiring terminals for each S-Bus sensor.
Use Fig. 76 and Table 16 to locate the wiring terminals for each
enthalpy control sensor.
DESCRIPTION
2
DESCRIPTION
S-Bus
Terminals
(1 and 2)
Fig. 76 — S-Bus Sensor DIP Switches
Table 16 — HH57AC081 Sensor Wiring Terminations
TERMINAL
NUMBER LABEL
1 S-BUS
2 S-BUS
Use Fig. 76 and Table 17 to set the DIP switches for the desired
use of the sensor.
Table 17 — HH57AC081 Sensor DIP Switch
DIP SWITCH POSITIONS FOR SWITCHES 1, 2, AND 3
USE
1
DA OFF
RA ON
OA OFF
NOTE: When a S-Bus sensor is connected to an existing network,
it will take 60 minutes for the network to recognize and auto-con-
figure itself to use the new sensor.
During the 60 minute setup period, no alarms for sensor failures
(except SAT) will be issued and no economizing function will be
available.
CO SENSOR WIRING
2
When using a CO sensor, the black and brown common wires are
2
internally connected and only one is connected to "IAQ COM" on
the W7220. Use the power from the W7220 to power the CO
sensor OR make sure the ground for the power supplies are com-
mon. See Fig. 77 for CO
57
DIP
Switch
Label
DIP
Switches
(3)
S-Bus
2 Pin Side
Connector
TYPE DESCRIPTION
S-BUS
Communications
S-BUS
(Enthalpy Control
Sensor Bus)
S-BUS
Communications
S-BUS
(Enthalpy Control
Sensor Bus)
2
ON
OFF
OFF
sensor wiring.
2
3
OFF
OFF
OFF
2