Carrier 48TF004-007 Horizontal Discharge Block-OffPlate, Durablade Economizer Installed in Unit

BLOCK-OFF PLATE

Fig. 19 — Horizontal Discharge Block-Off Plate

U-SHAPED

ECONOMIZER

HOLE

CONTROL

ECONOMIZER

ECONOMIZER

TOP

(NOT

BOARD

PLUG

MOTOR

SCREW

SHOWN)

WIRING

HARNESS

BAROMETRIC

RELIEF DAMPER

SHIPPING

SCREW

POSITION SETTING

BRACKET

Fig. 20 — Durablade Economizer Installed in Unit

ENTHALPY

CONTROL

REV

B .

OPEN

POSITIONMINIMUM

B

S

C

O

TR

D

S

T

3

1

P

HOOD

T1

4

2

5

P1

T ID

8

CONT

OR

CONT

Y

%

8 RUSH

A

1

IMUH

–

9

AC

UNPOWERED

SHO

C

30 60

70

90

1

AT

ACT

CTS

3

ENTHALPY

60

DAMPER

D

A

5A

TE

2

TR

10

CW

24V

RA

50

TINGS:

ST

AC

55

OUTDOOR

OPEN

B

SETPOINTS

WN

24V

3 .

HIGH

A

1

A

IN

75

CLOSED

DAMPER

mA

RUN,

TR1

CONTROL

F

VDC

1

TEMP

70 65

.

A

CCW

MIN

IN

ENTHALPY

°

1

–

3

1

.

5A

.

T

80

85

REV.

97-3672

EXAMPLE:

Given — Negative Pressure . . . . . . . . . . . . . . . . . . . . . . . 0.2 in. wg Outdoor Air . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 900 cfm

Determine — Setting = 5 in.

Fig. 22 — Outdoor-Air Thermostat/ Enthalpy Control Installation

Fig. 21 — Durablade Economizer Minimum Position Setting

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