6. Determine the enthalpy changeover set point from
Fig. 27. The enthalpy changeover set point should be set
to return the outdoor-air damper to the minimum position
when enthalpy rises above the set point. The settings are
A, B, C, and D. Set the enthalpy changeover per the set-
ting in Fig. 27.
7. Replace outdoor-air opening panel using screws from
Step 2. Replace filter access panel. Ensure the filter ac-
cess panel slides along the tracks and is securely en-
gaged. See Fig. 28.
8. Fasten hood top and side plate assembly (Fig. 29) to outdoor-
air opening panel with screws provided.
9. Slide outdoor-air inlet screen into screen track on hood
side plate. While holding screen in place, fasten screen
retainer to hood using screws provided. See Fig. 30.
NOTE: Refer to Fig. 31 for PARABLADE economizer baro-
metric relief damper characteristics.
CONTROL
CURVE
CONTROL POINT
(APPROX. DEG.)
AT 50% RH
A 73 (23)
B 70 (21)
C 67 (19)
D 63 (17)
RH — Relative Humidity
Fig. 27 — Enthalpy Settings for PARABLADE
Economizer
Fig. 28 — Panel Reinstalled on Unit
Fig. 29 — Outdoor-Air Hood Installed
on Unit
Fig. 30 — Filter Installed on Outdoor-Air
Hood
17
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