Cont a cts sho w n in h igh enthalpy, Or unpo wered st a te, Tr tr1 2 4 v a c – Carrier 48TJD User Manual
Page 14: Unit top, Oat (terminals are up) outside air screen, Enthalpy control hood block-off plate
14
ECONOMIZER
CONTROL
BOARD
ECONOMIZER
PLUG
ECONOMIZER
MOTOR
TOP
SCREW
BAROMETRIC
RELIEF DAMPER
WIRING
HARNESS
POSITION SETTING
BRACKET
U-SHAPED
HOLE
(NOT
SHOWN)
SHIPPING
SCREW
UNIT
TOP
OAT
(TERMINALS ARE UP)
OUTSIDE AIR
SCREEN
MINIMUM
POSITION
OPEN
3
1
T
P
P1
T1
4
2
5
S
S
O
D
C
TR
B
RE
V
.
B
1
9
8
8
1
8
A
%
H
U
M
I
D
I
T
Y
90
70
60
30
10
D
C
B
A
60
65
70
7
5
55
50
85
80
D
AMPER
D
AMPER
CLOSED
OPEN
OUTDOOR TEMP
.
°
F
REV.
97-36
72
CW
–
SETPOINTS
–
CCW
CONT
A
CTS SHO
W
N IN H
IGH ENTHALPY
R
U
S
H
A
T
2
4
V
A
C
3 m
A
M
IN.
A
T 1
1 VDC
CONT
AC
T
R
A
TINGS:
1.5A
R
UN,
3.5A
IN
OR UNPO
WERED ST
A
TE
1
2
3
TR
TR1
2
4
V
A
C
ENTHALPY
CONTR
OL
ENTHALPY
CONTROL
HOOD
BLOCK-OFF PLATE
Fig. 21 — Durablade Economizer Installed in Unit
Fig. 23 — Outdoor-Air Thermostat/
Enthalpy Control Installation
Example:
Given — Negative Pressure. . . . . . . . . . . . . . . . . . . . . . . 0.2 in. wg
Outdoor Air . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . 900 cfm
Determine — Setting = 5 in.
Fig. 22 — Durablade Economizer
Minimum Position Setting
Fig. 20 — Horizontal Discharge Block-Off Plate