Carrier 50HJQ004-007, Installation, Start-Up And Service Instructions Manual

Page: 13 / 48

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
Example:
Given — Negative Pressure . . . . . . . . . . . . . . . . . . . . . . 0.2 in. wg
Outdoor Air . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .900 cfm
Determine — Setting = 5 in.
Fig. 15 — Durablade Economizer
Minimum Position Setting
Fig. 13 — Horizontal Discharge Block-Off Plate
Fig. 14 — Durablade Economizer Installed in Unit
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
75
55
50
85
8
0
D
AMPER
D
AMPER
CLOSED
OPEN OUTDOOR TEMP
.
°
F
REV.
97-367
2
CW
–
SETPOINTS
–
CCW
CONT
A
CTS SHO
WN IN HIGH ENTHALPY
R
U
S
H
A
T
2
4
V
A
C
3 m
A
M
IN.
A
T 1
1 VDC
CONT
A
CT RA
TINGS:
1.5A
R
UN,
3.5A
IN
OR UNPO
W
ERED ST
A
TE
1
2
3
TR
TR1
24
V
A
C
ENTHALPY
CONTR
OL
ENTHALPY
CONTROL
HOOD
Fig. 16 — Outdoor-Air Thermostat/Enthalpy
Control Installation