22
Since 1965
MicroMetl
W7220 ECONOMIZER MODULE WIRING
Use tables 12 and 13 to locate the wiring terminals for the
economizer module.
Table 12 - Economizer Module -
Left Hand Terminal Blocks
Table 13 - Economizer Module -
Right Hand Terminal Blocks
Time-out and Screen Saver
When no buttons have been pressed for 10 minutes, the LCD
displays a screen saver, which cycles through the Status items.
Each Status item displays in turn and cycles to the next item after
5 seconds.
Label Type Description
Top Left Terminal Block
MAT
MAT
20k NTC
and COM
Mixed Air Temperature Sensor
(Polarity insensitive connections)
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 Block
n/a The rst terminal is not used
AUX2 I 24 Vac IN Shut Down (SD) or Heat (W)
Conventional only
and
Heat Pump Changeover (O/B) in
Heat Pump mode.
OCC 24 Vac IN Occupied / Unoccupied Input
E - GND E─GND Earth Ground - System Required
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 Block
Y2─1 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)
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