Carrier 48TC series, Service And Maintenance Instructions, Page: 65 / 112

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*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 Y–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 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 Y–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 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 Y–I and
Y2–I have not been satisfied.
Table 30 — Enthalpy Operation without DCV (CO
2
Sensor) — 1 Speed Fan
DEMAND
CONTROLLED
VENTILATION (DCV)
OUTSIDE AIR
GOOD TO
ECONOMIZE
Y1-I Y2-I FAN SPEED Y1-O Y2-O OCCUPIED UNOCCUPIED
NONE
No
Off Off High 0-v/Off 0-v/Off MIN POS Closed
On Off High 24-v/On 0-v/Off MIN POS Closed
On On High 24-v/On 24-v/On MIN POS Closed
Yes
Off Off High 0-v/Off 0-v/Off MIN POS Closed
On Off High 0-v/Off 0-v/Off
MIN POS to
Full-Open
Closed to
Full-Open
On On High 24-v/On 0-v/Off*
MIN POS to
Full-Open
Closed to
Full-Open
Table 31 — Enthalpy Operation with DCV (CO
2
Sensor) — 1 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 High 0-v/Off 0-v/Off
VENTMIN
Closed
On Off High 24-v/On 0-v/Off
VENTMIN
Closed
On On High 24-v/On 24-v/On
VENTMIN
Closed
Yes
Off Off High 0-v/Off 0-v/Off
VENTMIN
Closed
On Off High 0-v/Off 0-v/Off
VENTMIN to
Full-Open
Closed to
Full-Open
On On High 24-v/On 0-v/Off†
VENTMIN to
Full-Open
Closed to
Full-Open
Above CO
2
set
No
Off Off High 0-v/Off 0-v/Off
VENTMIN to
VENTMAX
Closed
On Off High 24-v/On 0-v/Off
VENTMIN L to
VENTMAX
Closed
On On High 24-v/On 24-v/On
VENTMIN H to
VENTMAX
Closed
Yes
Off Off High 0-v/Off 0-v/Off
VENTMIN L to
VENTMAX
Closed
On Off High 0-v/Off 0-v/Off
VENTMIN to
Full-Open
Closed to
Full-Open
On On High
DELAY*
24-v/On
0-v/Off†
VENTMIN to
Full-Open
Closed to
Full-Open
Table 32 — Dry Bulb 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
NONE No
Off Off Low 0-v/Off 0-v/Off MIN POS L Closed
On Off Low 24-v/On 0-v/Off MIN POS L Closed
On On High 24-v/On 24-v/On MIN POS H Closed
NONE Yes
Off Off Low 0-v/Off 0-v/Off MIN POS L Closed
On Off Low 0-v/Off 0-v/Off
MIN POS L
to Full-Open
Closed to
Full-Open
On On High
DELAY*
24-v/On
0-v/Off†
MIN POS H
to Full-Open
Closed to
Full-Open