50
2 Speed Fan Operation
NOTE: 2 Speed Fan operation applies to 50FC-*07 models only.
The W7220 controller has the capability to work with a system
using a 2 speed supply fan. The W7220 does not control the
supply directly but uses the following input status to determine
the speed of the supply fan and controls the OA damper to the
required position, see Table 15.
Table 15 — Fan Speed
The W (heating mode) is not controlled by the W7220 but it re-
quires the status to know where to position the OA damper for
minimum position for the fan speed.
The 2 speed fan delay is available when the system is pro-
grammed for 2 speed fan (in the System Setup menu item). The
2 speed fan delay is defaulted to 5 minutes and can be changed
in the Advanced Setup menu item. When the unit has a call for
Y1 In and in the free cooling mode and there is a call for Y2 In,
the 2-speed fan delay starts and the OA damper will modulate
100% open, the supply fan should be set to high speed by the
unit controller.
After the delay one of two actions will happen:
• The Y2 In call will be satisfied with the damper 100%
open and fan on high speed and the call will turn off
OR
• If the call for additional cooling in the space has not been
satisfied then the first stage of mechanical cooling will be
enabled through Y1 Out or Y2 Out.
Refer to Table 16 for economizer operation.
Table 16 — Economizer Operation - FAN TYPE = 2SPEED
*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
STATE
FAN SPEED
OCC
Low
Y1
Low
Y2
High
W
High
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
HIGH
MIN POS H
Closed
OFF
OFF
OFF
OFF
OFF
LOW
MIN POS L
Closed
OFF
ON
OFF
ON
OFF
LOW
MIN POS L
Closed
OFF
ON
ON
ON
ON
HIGH
MIN POS H
Closed
YES
ON
N/A
N/A
OFF
OFF
HIGH
MIN POS H
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
ON
ON
ON
OFF*
HIGH
MIN POS H to
Full Open
Closed to
Full Open
Below CO2 Set
NO
ON
N/A
N/A
OFF
OFF
HIGH
VENTMIN H
Closed
OFF
OFF
OFF
OFF
OFF
LOW
VENTMIN L
Closed
OFF
ON
OFF
ON
OFF
LOW
VENTMIN L
Closed
OFF
ON
ON
ON
ON
HIGH
VENTMIN H
Closed
YES
ON
N/A
N/A
OFF
OFF
HIGH
VENTMIN H
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
ON
ON
ON
OFF*
HIGH
VENTMIN H to
Full Open
Closed to
Full Open
Above CO2 Set
NO
ON
N/A
N/A
OFF
OFF
HIGH
VENTMIN H to
VENTMAX H
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
ON
ON
ON
ON
HIGH
VENTMAX H to
VENTMAX H
Closed
YES
ON
N/A
N/A
OFF
OFF
HIGH
VENTMIN H to
VENTMAX H
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
ON
ON
ON
OFF*
HIGH
VENTMIN H to
Full Open
Closed to
Full Open
Summary of Contents for 50FC A04 Series
Page 96: ...96 APPENDIX D WIRING DIAGRAMS Fig J 50FC 04 06 208 230 1 60 Unit with RTU Open Controller...
Page 97: ...97 APPENDIX D WIRING DIAGRAMS Fig K 50FC 04 06 208 230 3 60 Unit with RTU Open Controller...
Page 98: ...98 APPENDIX D WIRING DIAGRAMS Fig L 50FC 04 06 460 575 3 60 Unit with RTU Open Controller...
Page 99: ...99 APPENDIX D WIRING DIAGRAMS Fig M 50FC 07 208 230 Unit with RTU Open Controller...
Page 100: ...100 APPENDIX D WIRING DIAGRAMS Fig N 50FC 07 460 575 Unit with RTU Open Controller...
Page 101: ...101 APPENDIX D WIRING DIAGRAMS Fig O 50FC 04 06 Power Wiring Diagram 208 230 1 60...
Page 102: ...102 APPENDIX D WIRING DIAGRAMS Fig P 50FC 04 07 Power Wiring Diagram 208 230 3 60...
Page 103: ...103 APPENDIX D WIRING DIAGRAMS Fig Q 50FC 04 07 Power Wiring Diagram 460 575 3 60...
Page 104: ...104 APPENDIX D WIRING DIAGRAMS Fig R 50FC 04 06 SystemVu Control Wiring Diagram All Voltages...
Page 105: ...105 APPENDIX D WIRING DIAGRAMS Fig S 50FC 07 SystemVu Control Wiring Diagram All Voltages...
Page 106: ...106 APPENDIX D WIRING DIAGRAMS Fig T 50FC 04 06 SystemVu Power Wiring Diagram 208 230 1 60...
Page 107: ...107 APPENDIX D WIRING DIAGRAMS Fig U 50FC 04 07 SystemVu Power Wiring Diagram 208 230 3 60...
Page 108: ...108 APPENDIX D WIRING DIAGRAMS Fig V 50FC 04 07 SystemVu Power Wiring Diagram 460 575 3 60...