Carrier WeatherMaker 48FC04-07 Installation Instructions Manual page 39

2SP H/C (2 Speed Heat/Cool) Fan Operation (single phase
units only)
The W7220 controller does not actually control the fan
speed or the heat output of the unit, and only uses this infor-
mation to help determine the damper position. On single
phase units, the unit control board (UCB) will reduce the fan
speed during heating when the configured fan speed is set
outside the optimized heating speed window. If the job site
application forces this reduction in fan speed during heat, the
DEMAND
OUTSIDE AIR
CONTROLLED
GOOD TO
VENTILATION
ECONOMIZE
(DCV)
NO
NONE
YES
NO
Below CO Set
2
YES
NO
Above CO Set
2
YES
*With stage 3 delay (STG3 DLY) in Advanced setup, COOL Y2-OUT will be turned ON after the delay time specified.
N/A = Not applicable
Table 16 — Economizer Operation - FAN TYPE = 2SP H/C
INPUTS
W COOL
(HEAT ON) Y1-IN
ON N/A
OFF OFF
OFF ON
OFF ON
ON N/A
OFF OFF
OFF ON
OFF ON
ON N/A
OFF OFF
OFF ON
OFF ON
ON N/A
OFF OFF
OFF ON
OFF ON
ON N/A
OFF OFF
OFF ON
OFF ON
ON N/A
OFF OFF
OFF ON
OFF ON
economizer FAN TYPE must be set to keep the appropriate
outside air intake.
On single phase 48FC 3 to 5 ton units, if reduced the heat-
ing fan speed is lower than the cooling speed and the econo-
mizer FAN TYPE needs to be set to 2SP H/C (2 speed Heat/
Cool). This indicates that the heating and vent mode fan
speed is less than then cooling mode fan speed in the unit.
Refer to Table 16 for economizer operation.
3 Speed Fan Operation
FAN TYPE = 3SPEED is not used on 48FC units.
FAN SPEED
COOL COOL COOL
Y2-IN Y1-OUT Y2-OUT
N/A OFF OFF
OFF OFF OFF
OFF ON OFF
ON ON ON
N/A OFF OFF
OFF OFF OFF
OFF OFF OFF
ON ON OFF*
N/A OFF OFF
OFF OFF OFF
OFF ON OFF
ON ON ON
N/A OFF OFF
OFF OFF OFF
OFF OFF OFF
ON ON OFF*
N/A OFF OFF
OFF OFF OFF
OFF ON OFF
ON ON ON
N/A OFF OFF
OFF OFF OFF
OFF OFF OFF*
ON ON OFF*
39
OUTPUTS
DAMPER POSITION
(reference
OCCUPIED
only)
LOW MIN POS L
LOW MIN POS L
HIGH MIN POS H
HIGH MIN POS H
LOW MIN POS L
LOW MIN POS L
MIN POS H to
HIGH
Full Open
MIN POS H to
HIGH
Full Open
LOW VENTMIN L
LOW VENTMIN L
HIGH VENTMIN H
HIGH VENTMIN H
LOW VENTMIN L
LOW VENTMIN L
VENTMIN H to
HIGH
Full Open
VENTMIN H to
HIGH
Full Open
VENTMIN L to
LOW
VENTMAX L
VENTMIN L to
LOW
VENTMAX L
VENTMIN H to
HIGH
VENTMAX H
VENTMAX H to
HIGH
VENTMAX H
VENTMIN L to
LOW
VENTMAX L
VENTMIN L to
LOW
VENTMAX L
VENTMIN H to
HIGH
Full Open
VENTMIN H to
HIGH
Full Open
UNOCCUPIED
Closed
Closed
Closed
Closed
Closed
Closed
Closed to
Full Open
Closed to
Full Open
Closed
Closed
Closed
Closed
Closed
Closed
Closed to
Full Open
Closed to
Full Open
Closed
Closed
Closed
Closed
Closed
Closed
Closed to
Full Open
Closed to
Full Open