National High-Back Seat

See Fig. and see Fig. for seat controls.

If equipped, the BackCycler feature cyclically inflates and deflates air bladders in the low-back area of the seat. When used regularly during long periods of sitting, the BackCycler potentially relieves back strain.

National Seat Controls (Left-Side)

Seat Heat

If equipped, the heater switch turns on heating pads in the seat and low-back areas. See Fig..

A thermostat in the seat cushion monitors the temperature. When it detects the area has reached 114° F, both the low-back and seat heating pads will cycle off. When the thermostat detects the seat area has dropped to 81° F, both the low-back and seat heating pads will cycle on. Cycling is highly variable as heat is captured and the seat is insulated in various ways by different bodies.

Seat Height Adjustment

Pull up on the red valve switch to increase air pressure and raise the seat. Push down on the switch to lower the seat.

Leg and Back Air Support

Air cushions on either side of the seat and back can be inflated to provide support. See Fig. for cushion locations. Pull up on a valve switch to inflate an area; push down on a valve switch to deflate.

Three-Zone Air Lumbar Support

To adjust any of the three lumbar zones, pull up on a valve switch to inflate and push down to deflate. The further back the valve switch, the higher the lumbar zone it controls. See Fig. for the locations of the three low-back air cushions.

BackCycler Feature

If equipped, the Backcycler will inflate and deflate the lumbar area sections of the seat in 40 second cycles. To operate, deflate all three lumbar support areas then press the BackCycler switch to the ON position. Let the BackCycler go through two or three cycles before turning it off and reinflating the lumbar support air cushions to the desired comfort level.

Seat-Back Recline Adjustment

Rotate the triangular knob at the back of the seat rearward to increase the seat-back recline and forward to bring it back to vertical. The seat back can recline up to 23°.

Fore-and-Aft Seat Slide

The lever beneath the front of the seat cushion controls the fore-and aft position of seat. While sitting in the seat, move the lever to the left, then move the seat forward or back. When the seat is in the desired position, release the track slide lever to lock it into position. The seat can move seven inches (17.8 cm).

Seat Cushion Extension

With your weight off the seat, lift the bottom cushion adjustment handle and pull it forward or push it back to move the seat into the desired location.

National Seat Controls (Right-Side)

Rear Cushion Tilt

With your weight off the seat, rotate the knob clockwise to raise the rear of the seat cushion to the desired height. There are three rear cushion height positions.

Suspension Base Isolator

Rotate the knob counterclockwise to enable the isolation feature. Rotate the knob clockwise to decrease the level of isolation. To turn the isolator off, turn the knob clockwise until completely tightened.

Front Cushion Tilt

With your weight off the seat, rotate the knob clockwise to raise the front of the seat cushion to the desired height. There are three front cushion height positions.

Armrest Adjustment

Rotate an arm to the full up position then rotate it fully down. Then slowly raise the arm as you listen for clicks. Each click represents one of seven armrest positions. Stop when the armrest is high enough to support your forearm in a horizontal position. Each armrest can be adjusted independently.