Bryant Preferred 549K 04-06 Service And Maintenance Instructions page 34

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 0 .2
RETURN DUCT STATIC PRESSURE DROP (in. wg)
ECONOMI$ER IV
Fig. 60 — Return Air Temperature or Enthalpy Sensor
Mounting Location
Horizontal Economizers
3-5 Ton
6 Ton
0.15 0.2 0.25 0.3
Horizontal Economizers
3-5 Ton
6 Ton
0 .3 0 .4
Fig. 59 — Outdoor-Air Damper Leakage
ECONOMI$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)
EXH
N1
N
2V 10V
EXH
P1
P
Min
Pos
T1
Open
T
DCV
Max
2V 10V
AQ1
DCV
AQ
DCV
SO+
2V 10V
SO
Free
SR+
Cool
B C
SR
D
A
Fig. 61 — EconoMi$er IV W7212 Control
34
Vertical Economizers
3-5 Ton
6 Ton
0.2 0.25 0.3
Vertical Economizers
3-5 Ton
6 Ton
0 .3 0 .4
TR
Set
24 24 Vac
Vac
HOT
+
1
3
Set
EF
TR1
COM
_
2
5
4
EF1