Carrier 48TF004-007 - Manual (Page 13)

13
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
1 98818A % 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
D AMPER
D AMPER CLOSED
OPEN OUTDOOR TEMP
.
° F
REV. 97-3672
CW–SETPOINTS–CCW
CONT
A
CTS SHO
WN IN HIGH ENTHALPY
R USH
A T 24V
AC
3 mA
MIN.
A T 1
1 VDC
CONT
A
CT RA
TINGS:
1.5A
R
UN,
3.5A
IN
OR UNPO
WERED ST
A
TE
1
2
3
TR
TR1
24V
AC
ENTHALPY
CONTR
OL
ENTHALPY
CONTROL
HOOD
Fig. 22 — Outdoor-Air Thermostat/
Enthalpy Control Installation