Ingersoll-Rand EBC180-300, Installation, Operation And Maintenance Manual

Page: 28 / 40

Start Up
28 RT-SVX50F-EN
Table 9. Dry bulb operation no DCV (CO
2
sensor) - 2 speed fan
DCV
OA Good to
economize? Y1-I Y2-I FAN SPD 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
(a)
0-v/Off
(b)
MIN POS H to Full- Open Closed to Full-Open
(a) 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.
(b) With stage 3 delay (STG3 DLY) in Advanced setup menu can turn on 2nd stage of mechanical cooling Y2 -O after the delay if the call for Y1-I and Y2-I
have not been satisfied.
Table 10. Dry bulb operation with DCV (CO
2
sensor) - 2 speed fan
DCV
OA Good to
economize? Y1-I Y2-I FAN SPD 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
(a)
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
(b)
0-v/Off
(a)
VENTMIN H to Full-
Open
Closed to Full-Open
(a) With stage 3 delay (STG3 DLY) in Advanced setup menu can turn on 2nd stage of mechanical cooling Y2 -O after the delay if the call for Y1-I and Y2-I
have not been satisfied.
(b) 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.