Carrier 50FC A04 Series, Service And Maintenance Instructions, Page: 6 / 112

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NOTE: Values in the Field Accessories section are VDC adders.
Fig. 8 — Example of Fan Speed Set Up Labels for Electro-Mechanical Controls
Units with SystemVu™ controls
On units equipped with the factory-installed SystemVu con-
troller the Fan Speed settings are accessed through the System-
Vu interface.
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. 9),
calculate the RPM 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 RPM to base unit RPM 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. Press any key on the SystemVu interface to activate the
display backlight and then press the MENU key.
5. Using the UP and DOWN arrow keys highlight SET-
TINGS and then press ENTER.
6. Use the DOWN arrow key highlight the UNIT CONFIG-
URATIONS menu then press ENTER.
7. Highlight UNIT CONFIGURATIONS then press ENTER.
8. Highlight INDOOR FAN and then press ENTER.
9. Refer to the job specifications to set the following, deter-
mining the values per the RPM Calculator label (see
Fig. 9). Use the UP and DOWN arrow keys and the BACK
key to set the values. Press ENTER after setting each
value to continue to the next selection.
• IDF VENT SPD
• IDF HEAT SPD
• IDF LOW COOL SPD
• IDF HIGH SPD
• IDF FREE COOL SPD
For further details see the FC/GC Series Single Package Roof-
top Units with SystemVu Controller Controls, Start-up,
Operation and Troubleshooting manual.
Factory Setting:
7.8 V
DC
Field Setting:
V
DC
Switch Range:
A
B
C
B
A
C
Field Accessories:
ESP in. wg
V
DC
Calculator
CFM
0.2
5.4
5.8
6.1
6.5
6.8
7.2
7.6
7.9
8.3
1500
1625
1750
1875
2000
2125
2250
2375
2500
0.1
0.4
6.2
6.5
6.8
7.1
7.4
7.7
8.0
8.4
8.7
0.1
0.6
6.9
7.1
7.4
7.7
7.9
8.2
8.5
8.8
0.1
0.8
7.5
7.7
8.0
8.2
8.5
8.7
9.0
0.1
1.0
8.1
8.3
8.5
8.7
9.0
0.1
1.2
8.6
8.8
9.0
9.2
0.1
1.4
9.1
9.3
9.5
0.1
1.6 1.8 2.0
9.6
0.1
Economizer
1 Stage E Heat
2 Stage E Heat
UNIT MODEL
NUMBER
4.1 - 7.5
6.9 - 8.7
7.7 - 10.0
0.2
0.3 0.2
0.3 0.2
0.3 0.2
0.3 0.2
0.3 0.2
0.3 0.2
0.3 0.2
0.3
9.8
9.9
9.7
9.9
9.5
9.7
10.0
9.2
9.5
9.8
9.3
9.6
9.2
Record field setting here
*
* Overlap in A, B, C switch range
designed for maximum field
adjustment potential. For example
7.2 can be set at either A or B.