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BLOCK-OFF PLATE
ECONOMIZER
CONTROL
BOARD
ECONOMIZER
PLUG
ECONOMIZER
MOTOR
TOP
SCREW
BAROMETRIC
RELIEF DAMPER
WIRING
HARNESS
POSITION SETTING
BRACKET
U-SHAPED
HOLE
(NOT
SHOWN)
SHIPPING
SCREW
Fig. 19 — Horizontal Discharge Block-Off Plate
Fig. 20 — Durablade Economizer Installed in Unit
EXAMPLE:
Given —Negative Pressure. . . . . . . . . . . . . . . . . . . . . . . 0.2 in. wg
Outdoor Air . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 900 cfm
Determine — Setting = 5 in.
Fig. 21 — Durablade Economizer
Minimum Position Setting
MINIMUM
POSITION
OPEN
3
1
T
P
P1
T1
4
2
5
S
S
O
D
C
TR
B
REV. B
198818A
%
H
U
M
I
D
I
T
Y
90
70
60
30
10
D
C
B
A
60
65
70
75
55
50
85
80
DAMPER
DAMPER
CLOSED
OPEN
OUTDOOR TEMP
.
°
F
REV
.
97-3672
CW–SETPOINTS–CCW
CONT
A
CTS SHO
WN IN HIGH ENTHALPY
RUSH
AT 24V
AC
3 mA
MIN. A
T 1
1 VDC
CONT
ACT RA
TINGS: 1.5A
RUN, 3.5A IN
OR UNPOWERED ST
A
TE
1
2
3
TR
TR1
24V
AC
ENTHALPY CONTROL
ENTHALPY
CONTROL
HOOD
Fig. 22 — Outdoor-Air Thermostat/
Enthalpy Control Installation