Carrier WeatherExpert 48LC Series Service And Maintenance Instructions page 37

Table 15 — Economizer Module - Left Hand Terminal
LABEL TYPE
Top Left Terminal Block
MAT
20k NTC Mixed Air Temperature Sensor (Polarity
MAT
and COM Insensitive Connection)
OAT
20k NTC Outdoor Air Temperature Sensor (Polarity
OAT
and COM Insensitive Connection)
S-BUS
S-BUS Enthalpy Control Sensor
S-BUS
(Sylk* 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 24v
24 vac Damper Actuator 24 vac Source
*Sylk is a trademark of Honeywell International Inc.
Table 16 — 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
Y2-O
2 mechanical cooling
Y1 in - Cooling Stage 2 Input from space
Y1-I
24 vac IN
thermostat
24 vac OUT Y1 out - Cooling Stage 2 Output to stage
Y1-O
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. 49 and Table 17 to lo-
cate the wiring terminals for each S-Bus sensor.
Use Fig. 48 and Table 17 to locate the wiring terminals for each
enthalpy control sensor.
Blocks
DESCRIPTION
DESCRIPTION
Output to stage
2
Fig. 49 — S-Bus Sensor DIP Switches
Table 17 — HH57AC081 Sensor Wiring Terminations
TERMINAL
NUMBER
1
2
Use Fig. 49 and Table 18 to set the DIP switches for the desired
use of the sensor.
Table 18 — HH57AC081 Sensor DIP Switch
DIP SWITCH POSITIONS FOR SWITCHES 1, 2, AND 3
USE
DA
RA
OA
NOTE: When an S-Bus sensor is connected to an existing net-
work, it will take 60 minutes for the network to recognize and
auto-configure 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
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. 50 for CO
37
DIP
SWITCH
LABEL
DIP
SWITCHES
(3)
S-BUS S-BUS
TERMINALS 2 PIN SIDE
(1 AND 2) CONNECTOR
TYPE
LABEL
S-BUS S-BUS
S-BUS S-BUS
1 2
OFF ON
ON OFF
OFF OFF
sensor the black and brown common wires are
2
sensor wiring.
2
DESCRIPTION
S-BUS
Communications
(Enthalpy Control
Sensor Bus)
S-BUS
Communications
(Enthalpy Control
Sensor Bus)
3
OFF
OFF
OFF
2