Bryant 581B installation instructions Degree Rotation, Ð Horizontal Discharge Block-OffPlate

ECONOMIZER

CONTROL

BOARD

BAROMETRIC

RELIEF

DAMPER

ECONOMIZER

PLUG

ECONOMIZER

MOTOR

Fig. 19 Ð Horizontal Varislide™ Economizer Installation

(90 Degree Rotation)

BLOCK-OFF PLATE

Fig. 20 Ð Horizontal Discharge Block-Off Plate

WIRING

HARNESS

Fig. 21 Ð Typical Varislide Economizer and Wiring Harness

EXAMPLE:

Given:

Negative Pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.2 in. wg Outdoor Air . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 900 cfm

Determine Ð Settin g Ð 5 in.

Fig. 22 Ð Varislide Economizer Minimum Position Setting

8.Remove tape from outdoor-air thermostat (OAT). Fas- ten OAT to inside of hood using screws and speed clips provided. See Fig. 23. Make sure OAT terminals are positioned up.

9.Replace outdoor-air opening panel using screws from Step 2. Replace ®lter access panel. Ensure the ®lter access panel slides along the tracks and is securely engaged.

10.Fasten hood top and side plate assembly (Fig. 17) to outdoor-air opening panel with screws provided.

11.Place knob supplied with economizer on OAT. See Fig. 23. Set for 3° F below indoor room thermostat set- ting. If accessory enthalpy control (EC) is used in place of OAT, see instructions shipped with EC for installa- tion and adjustment. See Fig. 23.

12.Connect OAT per Fig. 24.

13.Slide outdoor-air inlet screen into screen track on hood side plate. While holding screen in place, fasten screen retainer to hood using screws provided.

NOTE: Refer to Fig. 25 for economizer barometric relief damper characteristics.

H. Optional PARABLADE Economizer

The optional PARABLADE economizer hood assembly is pack- aged and shipped in the ®lter section. Damper blades and control boards are installed at the factory and the econo- mizer is shipped in the vertical discharge position.

NOTE: Horizontal discharge block-off plate is shipped with the air hood package. The PARABLADE economizer can only be used for vertical discharge applications. Discard this plate.

Assembly

1.Determine if ventilation air is required in building. If so, determine the minimum amount to be supplied by each unit and record quantity of ventilation air needed for use in Step 6.

2.Remove ®lter access panel by raising panel and swing- ing panel outward. Panel is now disengaged from track and can be removed. No tools are required to remove ®lter access panel. Remove outdoor-air opening panel.

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