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Step 14 — Fan Speed Set Up
UNITS WITH ELECTRO-MECHANICAL CONTROLS
The Fan Speed set up controls are located on the lower section of
the Unit Control Board (UCB). See Fig. 56 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. 57),
calculate the Vdc from the CFM and ESP for the base unit
plus any field accessories (as listed on the label).
NOTE: The Fan Speed Set Up labels are located on the High Volt-
age cover in the Control Box.
3.
Connect a multimeter to the Vdc terminals on the UCB.
4.
Set the Range Switch to either A, B, or C per the Switch
Range table.
5.
Using a straight blade screwdriver turn the Vdc control dial to
fine tune the Vdc reading.
6.
Record the reading in the Field Setting field.
Fig. 56 — UCB Fan Speed Controls
46
FAN SPEED SET UP CONTROLS
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