Connections And Applications; W7220 Economizer Module Wiring - Carrier WeatherExpert 50LC Installation Instructions Manual

Connections and Applications

W7220 Economizer Module Wiring —
Use Fig. 45 and Tables 6 and 7 to locate the wiring
terminals for the Economizer module.
Left Terminal
Block Label
Table 6 – Economizer Module - -
Left Hand Terminal Blocks
Label Type
Top Left Terminal Block
MAT 20k NTC Supply Air Temperature Sensor
MAT and (polarity insensitive connection)
COM
OAT 20k NTC Outdoor Air Temperature Sensor
OAT and (polarity insensitive connection)
COM
S--- BUS S--- Bus Enthalpy Control Sensor
S--- BUS (Sylk Bus) (polarity insensitive connection)
Bottom Left Terminal Block
IAQ 2--- 10 2--- 10 Vdc Air Quality Sensor Input
(e.g. CO
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
W7220 Controller
NOTE: The bottom 4 Pin actuator header is not used
Fig. 45 - - W7220 Economizer Module Terminal Connection Labels
Description
sensor)
2
Right Terminal
Block Label
Table 7 – Economizer Module - -
Right Hand Terminal Blocks
Label Type
Top Right Terminal Block
N/A n/a
AUX2--- I 24 Vac IN
OCC 24 Vac IN
E--- GND E--- GND
EXH1 24 Vac OUT Exhaust Fan 1 Output
AUX1--- O 24 Vac OUT Programmable:
Bottom Right Terminal Block
Y2--- I 24 Vac IN
Y2--- O 24 Vac OUT Y2 out --- Cooling Stage 2 Output to
Y1--- I 24 Vac IN
Y1--- O 24 Vac OUT Y1 out --- Cooling Stage 2 Output to
C COM
R 24 Vac
Refer to Fig. 46 and 47 for sensor and controls connections.
34
Description
The first terminal is not used
Input from Thermostat W1 indicating
base unit is in Heat mode, damper
controls to High Fan Speed
setpoints
Occupied / Unoccupied Input
Earth Ground --- System Required
Exhaust fan 2 output
or
ERV
or
System Alarm output
Y2 in --- Cooling Stage 2 Input from
space thermostat
stage 2 mechanical cooling
Y1 in --- Cooling Stage 2 Input from
space thermostat
stage 2 mechanical cooling
24 Vac Common
24 Vac Power (Hot)
C14156