58
2SP H/C (2 Speed Heat/Cool) Fan Operation
FAN TYPE = 2SP H/C is not used on 48GC units.
3 Speed 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 information 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 opti-
mized heating speed window. If the job site application forces
this reduction in fan speed during heat, the economizer FAN
TYPE must be set to keep the appropriate outside air intake.
On single phase 48GC 3 to 5 ton units, if reduced the heating
fan speed is lower than the high cooling speed and higher than
the low cooling speed, hence the medium speed name. The
economizer FAN TYPE needs to be set to 3SPEED (3 speed).
This indicates that the heating fan speed is between the Low
cool/vent fan speed and the High cool speed. Refer to Table 24
for economizer operation.
Table 24 — Economizer Operation - FAN TYPE = 3SPEED
*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
INPUTS OUTPUTS
DEMAND
CONTROLLED
VENTILATION
(DCV)
OUTSIDE AIR
GOOD TO
ECONOMIZE
W
(HEAT ON)
COOL
Y1-IN
COOL
Y2-IN
COOL
Y1-OUT
COOL
Y2-OUT
FAN SPEED
(reference
only)
DAMPER POSITION
OCCUPIED UNOCCUPIED
NONE
NO
ON N/A N/A OFF OFF MEDIUM MIN POS M Closed
OFF OFF OFF OFF OFF LOW MIN POS L Closed
OFF ON OFF ON OFF LOW MIN POS L Closed
OFF ONONONON HIGH MIN POS H Closed
YES
ON N/A N/A OFF OFF MEDIUM MIN POS M Closed
OFF OFF OFF OFF OFF LOW MIN POS L Closed
OFF ON OFF OFF OFF LOW
MIN POS L to
Full Open
Closed to
Full Open
OFF ONONONOFF* HIGH
MIN POS H to
Full Open
Closed to
Full Open
Below CO
2
Set
NO
ON N/A N/A OFF OFF MEDIUM VENTMIN M Closed
OFF OFF OFF OFF OFF LOW VENTMIN L Closed
OFF ON OFF ON OFF LOW VENTMIN L Closed
OFF ONONONON HIGH VENTMIN H Closed
YES
ON N/A N/A OFF OFF MEDIUM VENTMIN M Closed
OFF OFF OFF OFF OFF LOW VENTMIN L Closed
OFF ON OFF OFF OFF LOW
VENTMIN L to
Full Open
Closed to
Full Open
OFF ONONONOFF* HIGH
VENTMIN H to
Full Open
Closed to
Full Open
Above CO
2
Set
NO
ON N/A N/A OFF OFF MEDIUM
VENTMIN M to
VENTMAX M
Closed
OFF OFF OFF OFF OFF LOW
VENTMIN L to
VENTMAX L
Closed
OFF ON OFF ON OFF LOW
VENTMIN L to
VENTMAX L
Closed
OFF ONONONON HIGH
VENTMIN H to
VENTMAX H
Closed
YES
ON N/A N/A OFF OFF MEDIUM
VENTMIN M to
VENTMAX M
Closed
OFF OFF OFF OFF OFF LOW
VENTMIN L to
VENTMAX L
Closed
OFF ON OFF OFF OFF* LOW
VENTMIN L to
Full Open
Closed to
Full Open
OFF ONONONOFF* HIGH
VENTMIN H to
Full Open
Closed to
Full Open
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