Horizontal Discharge Block-Off Plate; Durablade Economizer Installed In Unit; Durablade Economizer Minimum Position Setting; Outdoor-Air Thermostat/Enthalpy Control Installation - Carrier 48TJD Installation, Start-Up And Service Instructions Manual

Fig. 20 — Horizontal Discharge Block-Off Plate
U-SHAPED ECONOMIZER
CONTROL ECONOMIZER
HOLE
(NOT BOARD PLUG
SHOWN)
WIRING
HARNESS
Fig. 21 — Durablade Economizer Installed in Unit
Example:
Given — Negative Pressure. . . . . . . . . . . . . . . . . . . . . . . 0.2 in. wg
Outdoor Air . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . 900 cfm
Determine — Setting = 5 in.
Fig. 22 — Durablade Economizer
Minimum Position Setting
BLOCK-OFF PLATE
ECONOMIZER TOP
MOTOR SCREW
BAROMETRIC
RELIEF DAMPER
SHIPPING
SCREW
POSITION SETTING
BRACKET
TOP
OUTSIDE AIR
SCREEN
ENTHALPY
CONTROL
HOOD
Fig. 23 — Outdoor-Air Thermostat/
Enthalpy Control Installation
14
OAT
(TERMINALS ARE UP)
UNIT