Carrier 48TC series, Service And Maintenance Instructions, Page: 66 / 112

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*With 2SP FAN DELAY (Advanced Setup Menu) when in the economizing mode there is a delay for the high speed fan to try to satisfy the call for sec-
ond stage cooling by turning on the fan to high and opening the OA damper 100% before the first stage mechanical cooling is enabled.
†With stage 3 delay (STG3 DLY) in Advanced setup menu can turn on second stage of mechanical cooling Y2–O after the delay if the call for Y1–I and
Y2–I have not been satisfied.
*With 2SP FAN DELAY (Advanced Setup Menu) when in the economizing mode there is a delay for the high speed fan to try to satisfy the call for second
stage cooling by turning on the fan to high and opening the OA damper 100% before the first stage mechanical cooling is enabled.
†With stage 3 delay (STG3 DLY) in Advanced setup menu can turn on second stage of mechanical cooling Y2–O after the delay if the call for Y1–I and
Y2–I have not been satisfied.
Table 33 — Dry Bulb Operation with DCV (CO
2
Sensor) — 2 Speed Fan
DEMAND
CONTROLLED
VENTILATION (DCV)
OUTSIDE AIR
GOOD TO
ECONOMIZE
Y1-I Y2-I
FAN
SPEED
Y1-O Y2-O OCCUPIED UNOCCUPIED
Below CO
2
Set
No
OFF OFF LOW 0v/Off 0v/Off VENTMIN Closed
ON OFF LOW 24v/On 0v/Off VENTMIN Closed
ON ON HIGH 24v/On 24v/On VENTMIN Closed
Yes
OFF OFF LOW 0v/Off 0v/Off VENTMIN Closed
ON OFF LOW 0v/Off 0v/Off
VENTMIN to
Full-Open
Closed to Full-Open
ON ON HIGH 24v/On 0v/Off
VENTMIN to
Full-Open
Closed to Full-Open
Above CO
2
Set
No
OFF OFF LOW 0v/Off 0v/Off
VENTMIN to
VENTMAX
Closed
ON OFF LOW 24v/On 0v/Off
VENTMIN to
VENTMAX
Closed
ON ON HIGH 24v/On 24v/On
VENTMIN to
VENTMAX
Closed
Yes
OFF OFF LOW 0v/Off 0v/Off
VENTMIN to
VENTMAX
Closed
ON OFF LOW 0v/Off 0v/Off
VENTMIN to
Full-Open
Closed to Full-Open
ON ON HIGH
DELAY*
24v/On
0v/Off†
VENTMIN to
Full-Open
Closed to Full-Open
Table 34 — Enthalpy Operation without DCV (CO
2
Sensor) — 2 Speed Fan
DEMAND
CONTROLLED
VENTILATION (DCV)
OUTSIDE AIR
GOOD TO
ECONOMIZE
Y1-I Y2-I
FAN
SPEED
Y1-O Y2-O OCCUPIED UNOCCUPIED
NO CO
2
SENSOR
NO
OFF OFF LOW 0v/Off 0v/Off MIN POS Closed
ON OFF LOW 24v/On 0v/Off MIN POS Closed
ON ON HIGH 24v/On 24v/On MIN POS Closed
YES
OFF OFF LOW 0v/Off 0v/Off MIN POS Closed
ON OFF LOW 0v/Off 0v/Off MIN POS to Full Open Closed to Full-Open
ON ON HIGH
DELAY*
24v/On
0v/Off† MIN POS to Full Open Closed to Full-Open