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13
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$er chooses the switchover strategy with the most en-
ergy savings, provided that the required sensors are connected
and functioning normally.
Refer to Table 4 to determine the sensors required for each
strategy.
Differential Enthalpy Switchover Strategy
— The differen-
tial enthalpy switchover strategy must be selected manually, if
required. To enable, press and hold the CONFIG button for 30
seconds, then release. The LED will flash twice to indicate the
change of configuration.
To return to single enthalpy mode, press and hold the CON-
FIG button for 30 seconds. The LED will flash once to indicate
the change of configuration.
DISCHARGE AIR THERMISTOR (DAT) — The discharge
air thermistor is factory-mounted on the supply-fan housing in
the fan section of the unit. The DAT is factory-wired to the
EconoMi$er Control Module.
CO
2
CONTROL SETUP — If a CO
2
sensor is not being
used, proceed to the next section. If a CO
2
sensor is being used,
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
2
SP (PPM) potentiometer and adjust to the
desired set point. See Fig. 16.
IMPORTANT: If a sensor stops functioning nor-
mally (becomes unreliable), the EconoMi$er
switches to the next best strategy.
SENSOR
COVER
OUTSIDE AIR SENSOR
MOUNTING
SCREW
MOUNTING SCREW
WIRING
HARNESS
SENSOR
WIRING
CONNECTIONS
Fig. 22 — Outdoor-Air Sensor Details
Fig. 21 — Outdoor-Air Sensor Location
Fig. 19 — Seal Strip Location
(Air Hood Cross-Sectional View)
NOTE: The outdoor-air hood comes with a baffle which is used on
028 units only; discard baffle for 016-024 units.
Fig. 20 — Outdoor-Air Hood Details
HOOD TOP
PANEL
HOOD SIDE
PANELS (2)
BAFFLE
(028 ONLY)
LOWER
FILTER
RETAINER
FILTER SUPPORT
BRACKET
HOOD DRAIN PAN
UPPER FILTER RETAINER
BAFFLE (028 ONLY)
LOWER FILTER
RETAINER
FILTER SUPPORT
BRACKET