Carrier 48GC04 Service And Maintenance Instructions page 43

HORIZONTAL ECONOMIZER BAROMETRIC RELIEF FLOW
2500
2000
1500
1000
500
0
0 0.05 0.1
RETURN DUCT STATIC PRESSURE (in. wg)
HORIZONTAL ECONOMIZER RETURN AIR PRESSURE DROP
6000
5000
4000
3000
2000
1000
0
0 0 .1
RETURN DUCT STATIC PRESSURE DROP (in. wg)
ECONOMI$ER IV
Fig. 71 — Return Air Temperature or Enthalpy Sensor
Mounting Location
Horizontal Economizers
3-5 Ton
0.15 0.2 0.25 0.3
Horizontal Economizers
3-5 Ton
0 .2 0 .3 0 .4
Fig. 70 — Outdoor-Air Damper Leakage
ECONOMI$ER IV
CONTROLLER
GROMMET
RETURN AIR
SENSOR
RETURN DUCT
(FIELD-PROVIDED)
VERTICAL ECONOMIZER BAROMETRIC RELIEF FLOW
2500
2000
1500
1000
500
0
0 0.05 0.1 0.15
RETURN DUCT STATIC PRESSURE (in. wg)
VERTICAL ECONOMIZER RETURN AIR PRESSURE DROP
6000
5000
4000
3000
2000
1000
0
0 0 .1 0 .2
RETURN DUCT STATIC PRESSURE DROP (in. wg)
N1
N
2V 10V
EXH
P1
P
T1
Open
T
DCV
2V 10V
AQ1
DCV
AQ
DCV
SO+
2V 10V
SO
Free
SR+
Cool
B
SR
A
Fig. 72 — EconoMi$er IV W7212 Control
43
Vertical Economizers
3-5 Ton
0.2 0.25 0.3
Vertical Economizers
3-5 Ton
0 .3 0 .4
TR
EXH
Set
24
Vac
HOT
Min
Pos
+
1
Max
3
Set
EF
C
D
TR1
24 Vac
COM
_
2
5
4
EF1