Bryant 558F User Manual download pdf (Page 15)

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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.

Refer to Table 4 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 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.

E. CO

Control Setup

The CO

sensor monitors carbon dioxide levels. This infor-

mation is used to modify the position of the outdoor-air

dampers to admit more or less air.

1. Determine the value at which the minimum position

of the dampers will 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 desired set point. See Fig. 17.

HOOD TOP

PANEL

HOOD SIDE

PANELS (2)

BAFFLE

(300

ONLY)

LOWER

FILTER

RETAINER

FILTER SUPPORT

BRACKET

HOOD DRAIN PAN

UPPER FILTER RETAINER

BAFFLE (300 ONLY)

LOWER FILTER

RETAINER

FILTER SUPPORT

BRACKET

Fig. 20 — Seal Strip Location

(Air Hood Cross-Sectional View)

NOTE:

The outdoor-air hood comes with a baffle which is used on

size 300 units only; discard baffle for 180-240 units.

Fig. 21 — Outdoor-Air Hood Details

SENSOR

COVER

OUTSIDE AIR SENSOR

MOUNTING

SCREW

MOUNTING SCREW

WIRING

HARNESS

SENSOR

WIRING

CONNECTIONS

Fig. 23 — Outdoor-Air Sensor Details

Fig. 22 — Outdoor-Air Sensor Location

1 2 ... 10 11 12 13 14 15 16 17 18 19 20 ... 39 40

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