SENSOR | OUTSIDE AIR SENSOR |
COVER |
|
Fig. 19 — Seal Strip Location
(Air Hood Cross-Sectional View)
BAFFLE (180 AND 240 ONLY)
LOWER FILTER
RETAINER
FILTER SUPPORT
BRACKET
HOOD SIDE
PANELS (2)
HOOD TOP PANEL
BAFFLE
(180 AND
240 ONLY)
LOWER
FILTER
RETAINER
FILTER SUPPORT
BRACKET
HOOD DRAIN PAN
UPPER FILTER RETAINER
NOTE: The
Fig. 20 — Outdoor-Air Hood Details
C. Commissioning
The EconoMi$er saves energy when it uses outdoor air to provide free cooling instead of mechanical air conditioning. The EconoMi$er switchover strategy determines if the out- door air is suitable for free cooling. The EconoMi$er chooses the switchover strategy with the most energy savings, pro- vided that the required sensors are connected and function- ing normally.
IMPORTANT: If a sensor stops functioning normally (becomes unreliable), the EconoMi$er switches to the next best strategy.
Fig. 21 — Outdoor-Air Sensor Location
MOUNTING SCREW
SENSOR
WIRING
CONNECTIONS
MOUNTING
SCREW
WIRING
HARNESS
Fig. 22 — Outdoor-Air Sensor Details
Refer to Table 5 to determine the sensors required for each strategy.
Differential Enthalpy Switchover Strategy
The differential 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 indi- cate the change of configuration.
D. Discharge Air Thermistor (DAT)
The discharge air thermistor is
E. CO2 Control Setup
If a CO2 sensor is not being used, proceed to the next section. If a CO2 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 CO2 SP (PPM) potentiometer and adjust to the desired set point. See Fig. 16.
