5
Units with Electro-mechanical controls
The Fan Speed set up controls are located on the lower sec-
tion of the Unit Control Board (UCB). See Fig. 7 for location.
1. Check the job specifications for the CFM (cubic feet per
minute) and ESP (external static pressure) required.
2. Using the chart on the Fan Speed Set Up labels (see
Fig. 8), calculate the Vdc from the CFM and ESP for the
base unit.
3. If installing any accessories listed at the bottom of the Set
Up Label, add accessory Vdc to base unit Vdc in upper
portion of label. For electric heaters use only one adder.
(ex. 2 stage heater uses only 2 stage adder, not 1 stage plus
2 stage).
NOTE: The Fan Speed Set Up labels are located on the High Volt-
age cover in the Control Box.
4. Connect a multimeter to the Vdc terminals on the UCB.
5. Set the Range Switch to either A, B, or C per the Switch
Range table.
6. Using a straight blade screwdriver turn the Vdc control
dial to fine tune the Vdc reading.
7. Record the reading in the Field Setting field.
Low Speed Fan Adjustment
2-Pin DIP Switch
The Low Speed 2-Pin DIP switch is located near the center of
the UCB. See Fig. 7.
When replacing UCB, the board will be shipped as default
without a low speed selected. To select correct FC low fan
speed for 3 to 5 ton 50FC units set both dip switches to "OFF"
(0). For 6 ton 50FC units set both dip switches "ON". (1). See
Table 1. The dip switch positions can also be found on the
unit's control label diagram.
Table 1 — LOW SPEED 2-Pin DIP Switch Settings
Fig. 7 — UCB Fan Speed Controls
UNIT SIZE
(TONS)
LOW SPEED
% OF USER SET
FAN SPEED
DIP1 DIP2
3, 4, 5
0
0
100%
6
1
1
66%
FAN SPEED SET UP CONTROLS
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...