Carrier 50TJ016-028 Installation, Start-Up And Service Instructions Manual page 13

BAFFLE (028 ONLY)
HOOD TOP
PANEL
NOTE: The outdoor-air hood comes with a baffle which is used on
size 028 units only; discard baffle for size 016 and 024 units.
Fig. 20 — Outdoor-Air Hood Details
COMMISSIONING — The EconoMi$er saves energy when
it uses outdoor air to provide free cooling instead of mechani-
cal air conditioning. The EconoMi$er switchover strategy de-
termines if the outdoor air is suitable for free cooling. The
EconoMi$er chooses the switchover strategy with the most en-
ergy savings, provided that the required sensors are connected
and functioning normally.
IMPORTANT: If a sensor stops functioning normally
(becomes unreliable), the EconoMi$er switches to the
next best strategy.
Refer to Table 5 to determine the sensors required for each
strategy.
Differential Enthalpy Switchover Strategy — The differen-
tial enthalpy switchover strategy must be selected manually, if
required. To enable, press and hold the CONFIG button for
30 seconds, then release. The LED will flash twice to indicate
the change of configuration.
To return to single enthalpy mode, press and hold the CON-
FIG button for 30 seconds. The LED will flash once to indicate
the change of configuration.
DISCHARGE AIR THERMISTOR (DAT) — The discharge
air thermistor is factory-mounted on the supply-fan housing in
LOWER FILTER
RETAINER
FILTER SUPPORT
BRACKET
HOOD SIDE
PANELS (2)
BAFFLE
(028 ONLY)
LOWER
FILTER
RETAINER
FILTER SUPPORT
BRACKET
HOOD DRAIN PAN
UPPER FILTER RETAINER
SENSOR
COVER
Fig. 21 — Outdoor-Air Sensor Location
Fig. 22 — Outdoor-Air Sensor Details
the fan section of the unit. The DAT is factory-wired to the
EconoMi$er Control Module.
CO CONTROL SETUP — If a CO
2
used, proceed to the next section. If a CO
perform the following:
1. Determine the value at which you want the minimum
position of the dampers to begin opening to allow a
greater amount of outdoor air to enter. The range is
800 to 1,400 ppm.
2. Locate the CO SP (PPM) potentiometer and adjust to the
2
desired set point. See Fig. 16.
MECHANICAL COOLING LOCKOUT — Determine the
outdoor-air temperature at which you want the mechanical
cooling (compressors) to be disabled. Locate the mechanical
cooling lockout (MECH CLG LOCKOUT) potentiometer. To
disable this feature, turn the potentiometer counterclockwise
(CCW) to the OFF position. Otherwise, set the value between
10 and 60 F. Mechanical cooling will not operate when the out-
door air temperature is below this value. See Fig. 16.
13
OUTSIDE AIR SENSOR
MOUNTING SCREW
SENSOR
WIRING
CONNECTIONS
MOUNTING
SCREW
WIRING
HARNESS
sensor is not being
2
sensor is being used,
2