035-17311-000 REV A (1200))
Unitary Products Group 19
.
SET POINT ADJUSTMENT
1. The enthalpy set point for the dampers may now be set
by selecting the desired setpoint. Adjust as follows:
• For a single enthalpy carefully turn the set point adjust-
ing screw to the “A”, “B”, “C” or “D” setting corresponding
to the lettered curve.
• For a dual enthalpy carefully turn the set point adjusting
screw fully clockwise past the “D” setting.
2. To check that the damper blades move smoothly without
binding carefully turn the minimum position adjusting
screw fully clockwise and then energize and de-energize
terminals “R to “G”. With terminals “R” to “G” energized,
turn the minimum position screw counterclockwise until
the desired minimum position has been attained.
FIGURE 19 : ENTHALPY SET POINT CHART
Extreme care must be exercised in turning both
the setpoint and minimum position adjusting
screws to prevent twisting them off.
TABLE 14: ACCESSORY STATIC RESISTANCE
1
Description
External Static Pressure Drop - Resistance, IWG
CFM
2250 3000 4000 5000 6000
Economizer
0.03 0.03 0.04 0.07 0.09
1.
Deduct these resistance values from the available
external static pressure shown in the respective Blower
Performance Table.
To Next Page
Loading...
