Carrier 48PG20-28 specifications Outdoor-Air Hood Assembled

Fig. 19 — Outdoor-Air Hood Assembled

LOCKING SCREW

MOVEABLE DAMPER

AIR FILTER POSITION MOVEABLE DAMPER

Fig. 20 — Manual Damper Details

Step 11 — Position Optional Power Exhaust or Barometric Relief Damper Hood — The optional power exhaust or barometric relief dampers are shipped assembled and tilted back into the unit for shipping. Brackets and extra screws are shipped in shrink wrap around the dampers.

1.Remove 9 screws holding each damper assembly in place. See Fig. 21. Each damper assembly is secured with 3 screws on each side and 3 screws along the bottom. Save screws.

Be careful when tilting blower assembly. Hoods and blow- ers are heavy and can cause injury if dropped.

2.Pivot the damper assembly outward until top edge of the damper assembly rests against the inside wall of unit.

3.Secure each damper assembly to unit with 6 screws across top (3 screws provided) and bottom (3 screws from Step 1) of damper.

4.With screws saved from Step 1, install brackets on each side of damper assembly. See Fig. 22.

5.Remove tape from damper blades.

Step 12 — Non-Fused Disconnect — The handle for the factory-installed non-fused disconnect is shipped inside the unit to prevent the handle from damage during shipping. Follow these steps to complete installation of the handle.

BE SURE POWER IS SHUT OFF TO THE UNIT FROM THE BUILDING POWER SUPPLY. Electrical shock could cause personal injury.

1.Open the control box access door.

2.Remove the small cover plate located on the unit corner post near the control section.

3.Remove the inner control box cover. The handle and shaft are located in a plastic bag at the bottom of the control box.

4.Insert the square shaft into the disconnect with the pins vertical. On the 100-amp disconnect, the shaft is keyed into the disconnect and can only be installed one way (with the pins vertical).

5.Insert the handle through the corner post and onto the shaft with the handle positioned so that “OFF” is on top.

6.Rotate the handle to the “ON” position to lock the pins into the handle.

7.From the inside of the corner post, attach the handle mounting screws to the handle. Slide the shaft fully into the handle and tighten the set screw(s) on the disconnect to lock the shaft. Tighten the screws that attach the handle to the corner post.

8.Rotate the handle back to the “OFF” position.

9.Replace all panels and doors. Power can now be turned back on to the unit.

Step 13 — Install All Accessories — After all of the factory-installed options have been adjusted, install all field-installed accessories. Refer to the accessory installation instructions included with each accessory. Consult the Carrier Price Pages for accessory package numbers for particular applications.

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