Carrier WeatherExpert 50LC14, Installation Instructions Manual, Page: 52 / 84

52
Fig. 69 — W7220 Wiring Terminals
Table 8 — Economizer Module - Left Hand Terminal
Blocks
* Sylk is a trademark of Honeywell International Inc.
Table 9 — Economizer Module - Right Hand Terminal
Blocks
W7220 Controller
Left Terminal
Block Label
Right Terminal
Block Label
NOTE: The bottom 4 Pin actuator header is not used
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
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)