Fig. 20 — Horizontal Discharge 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)
Fig. 21 — Varislide™ Economizer Installed in Unit
EXAMPLE:
Given — Negative Pressure ..................0.2in.wg
Outdoor Air ........................900cfm
Determine — Setting=5in.
Fig. 22 — Varislide 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
CONTACTS SHOWN IN HIGH ENTHALPY
RUSH AT 24VAC
3 mA MIN. AT 11 VDC
CONTACT RATINGS: 1.5A RUN, 3.5A IN
OR UNPOWERED STATE
1
2
3
TR
TR1
24VAC
ENTHALPY
CONTROL
Fig. 23 — Outdoor-Air Thermostat/Enthalpy
Control Installation
15
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