25
*Sylk is a trademark of Honeywell International Inc.
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. 43 and
Table 11 to locate the wiring terminals for each S-Bus and en-
thalpy control sensor.
Fig. 43 — S-Bus Sensor DIP Switches
Use Fig. 43 and Table 12 to set the DIP switches for the desired
use of the sensor.
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 fail-
ures (except SAT) will be issued and no economizing function
will be available.
CO
2
Sensor Wiring
When using a CO
2
sensor, the black and brown common wires
are internally connected and only one is connected to “IAQ
COM” on the W7220. Use the power from the W7220 to pow-
er the CO
2
sensor OR make sure the ground for the power sup-
plies are common. See Fig. 44 for CO
2
sensor wiring.
Table 9 — Economizer Module
(Left Hand Terminal Blocks)
LABEL TYPE DESCRIPTION
Top Left Terminal Block
MAT
MAT
20k NTC
and COM
Mixed Air Temperature Sensor (Polarity
Insensitive Connection)
OAT
OAT
20k NTC
and COM
Outdoor Air Temperature Sensor (Polarity
Insensitive Connection)
S-BUS
S-BUS
S-BUS
(Sylk* Bus)
Enthalpy Control Sensor
(Polarity Insensitive Connection)
Bottom Left Terminal Block
IAQ 2-10 2-10 vdc
Air Quality Sensor Input (e.g. CO
2
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
Table 10 — Economizer Module
(Right Hand Terminal Blocks)
LABEL TYPE DESCRIPTION
Top Right Terminal Blocks
AUX2 I 24 vac IN The first terminal is not used.
OCC 24 vac IN
Shut Down (SD) or HEAT (W)
Conventional only
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
AUX1 O 24 vac OUT
Programmable:
Exhaust fan 2 output
or
ERV
or
System alarm output
Bottom Right Terminal Blocks
Y2-I 24 vac IN
Y2 in - Cooling Stage 2 Input from space
thermostat
Y2-O 24 vac OUT
Y2 out - Cooling Stage 2 Output to stage
2 mechanical cooling
Y1-I 24 vac IN
Y1 in - Cooling Stage 2 Input from space
thermostat
Y1-O 24 vac OUT
Y1 out - Cooling Stage 2 Output to stage
2 mechanical cooling
C COM 24 vac Common
R 24 vac 24 vac Power (hot)
Table 11 — HH57AC081 Sensor Wiring Terminations
TERMINAL
TYPE DESCRIPTION
NUMBER LABEL
1 S-BUS S-BUS
S-BUS
Communications
(Enthalpy Control
Sensor Bus)
2 S-BUS S-BUS
S-BUS
Communications
(Enthalpy Control
Sensor Bus)
Table 12 — HH57AC081 Sensor DIP Switch
USE
DIP SWITCH POSITIONS FOR SWITCHES 1, 2, AND 3
123
DA OFF ON OFF
RA ON OFF OFF
OA OFF OFF OFF
DIP
SWITCH
LABEL
DIP
SWITCHES
(3)
S-BUS
2 PIN SIDE
CONNECTOR
S-BUS
TERMINALS
(1 AND 2)
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