![background image](http://html.mh-extra.com/html/carrier/50hcq12/50hcq12_installation-instructions-manual_2563303039.webp)
39
Table 17 —
Enthalpy Operation, with Demand Controlled Ventilation (DCV) (CO
2
Sensor) — 1 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 18 —
Dry Bulb 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 19 —
Dry Bulb 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
Below
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
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
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
Summary of Contents for 50HCQ12
Page 4: ...4 Fig 2 Unit Dimensional Drawing Size 12 Units ...
Page 5: ...5 Fig 2 Unit Dimensional Drawing Size 12 Units cont ...
Page 9: ...9 Fig 6 Roof Curb Details REV 50TM500827 ...
Page 25: ...25 Fig 42 Typical 50HCQ Control Wiring Diagram ...
Page 26: ...26 Fig 43 Typical 50HCQ Power Wiring Diagram 208 230 3 60 unit shown ...
Page 27: ...27 Fig 44 PremierLink Controller Wiring Schematic ...
Page 28: ...28 Fig 45 RTU Open Controller System Wiring Diagram ...