Carrier 50HCQ12, Installation Instructions Manual

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Table 20 — Enthalpy Operation, No Demand Controlled Ventilation (DCV) (CO
2
Sensor) — 2 Speed Fan
*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, second stage
of mechanical cooling Y2-O can be turned on after the delay if the calls for
Y1-I and Y2-I have not been satisfied.
Table 21 — Enthalpy Operation, with Demand Controlled Ventilation (DCV) (CO
2
Sensor) — 2 Speed Fan
*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, second stage
of mechanical cooling Y2-O can be turned on after the delay if the calls for
Y1-I and Y2-I have not been satisfied.
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
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
DCV
OUTSIDE AIR
GOOD TO
ECONOMIZE?
Y1-I Y2-I FAN SPEED Y1-O Y2-O OCCUPIED UNOCCUPIED
Below Set
No
Off Off Low 0-v/Off 0-v/Off VENTMIN L Closed
On Off Low 24-v/On 0-v/Off VENTMIN L Closed
On On High 24-v/On 24-v/On VENTMIN H Closed
Yes
Off Off Low 0-v/Off 0-v/Off VENTMIN L Closed
On Off Low 0-v/Off 0-v/Off VENTMIN L to Full-Open Closed to Full-Open
On On High 24-v/On 0-v/Off
†
VENTMIN H to Full-Open Closed to Full-Open
Above Set
No
Off Off Low 0-v/Off 0-v/Off VENTMIN L to VENTMAX Closed
On Off Low 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 Low 0-v/Off 0-v/Off VENTMIN L to VENTMAX Closed
On Off Low 0-v/Off 0-v/Off VENTMIN L to Full-Open Closed to Full-Open
On On High
DELAY*
24-v/On
0-v/Off
†
VENTMIN H to Full-Open Closed to Full-Open