Bryant 548F User Manual download pdf (Page 14)

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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 7.

2. Remove filter access panel by raising panel and

swinging panel outward. Panel is now disengaged

from track and can be removed. No tools are required

to remove filter access panel. Remove outdoor-air

opening panel. Save panels and screws. See Fig. 10.

Remove optional outdoor-air hood package from filter

section.

3. Assemble outdoor-air hood top and side plates as

shown in Fig. 11. Install seal strips on hoop top and

sides. Put aside screen retainer and retainer screw

for later assembly. Do not attach hood to unit at this

time.

4. Economizer comes factory-installed in unit and

secured with screws. See Fig. 12.

NOTE: Be sure rear economizer flange is engaged under tabs

in vertical return-air opening. See Fig. 24.

5. To convert to horizontal discharge application:

a. Rotate the economizer 90 degrees until the econo-

mizer motor faces the outdoor section (see Fig. 13).

b. Remove shipping screw and tape and then rotate

the barometric relief damper hinge 90 degrees.

Barometric relief damper should open vertically to

operate properly.

c. Install horizontal discharge block-off plate over the

opening on the access panel. (Block-off plate MUST

be installed before installing hood assembly.)

6. Remove existing 12-pin blue and yellow wire jumper

plug and store. Insert 12-pin economizer plug into

economizer harness. See Fig. 12.

7. If ventilation air is not required, proceed to Step 8. If

ventilation air is required, determine the minimum

position setting for required airflow. See Fig. 14.

Adjust minimum position setting by adjusting the

screws on the position setting bracket. Slide bracket

until the top screw is in the position determined by

Fig. 14. Tighten screws. See Fig. 15.

8. Remove tape from outdoor-air thermostat (OAT). Fas-

ten OAT to inside of hood using screws and speed

clips provided. See Fig. 16. Make sure OAT terminals

are positioned up.

9. Replace outdoor-air opening panel using screws from

Step 2. Replace filter access panel. Ensure the filter

access panel slides along the tracks and is securely

engaged.

10. Fasten hood top and side plate assembly (Fig. 11) to

outdoor-air opening panel with screws provided.

11. Place knob supplied with economizer on OAT. See

Fig. 16. Set for 3° F below indoor room thermostat

setting. If accessory enthalpy control (EC) is used in

place of OAT, see instructions shipped with EC for

installation and adjustment. See Fig. 16.

12. Connect OAT per Fig. 17.

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. 18 for economizer barometric relief

damper characteristics.

Fig. 10 — Typical Access Panel Locations

Fig. 11 — Outdoor-Air Hood Details

Fig. 12 — Durablade Economizer Installed in Unit

ECONOMIZER

CONTROL

BOARD

ECONOMIZER

PLUG

ECONOMIZER

MOTOR

TOP

SCREW

BAROMETRIC

RELIEF DAMPER

WIRING

HARNESS

POSITION SETTING

BRACKET

U-SHAPED

HOLE

(NOT

SHOWN)

SHIPPING

SCREW

1 2 ... 9 10 11 12 13 14 15 16 17 18 19 ... 47 48

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Bryant 548F User Manual Page 14

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