Pump Rotor

(Procedure if rotor is binding)

1.Remove upper shell (see page 10).

2.Remove filter end cover screws using 5/16" nut- driver.

3.Remove filter end cover and air filters.

4.Remove pump plate screws using 5/16" nut- driver.

5.Remove pump plate.

6.Remove rotor, insert, and blades.

7.Check for debris in pump. If debris is found, blow out with compressed air.

8.Install insert and rotor.

9.Check gap on rotor. Adjust to .076/.101 mm (.003"/.004") if needed (see Figure 27).

Note: Rotate rotor one

full turn to insure the gap is

.076/.101 mm (.003"/.004") at tightest position. Adjust if needed.

10.Install blades, pump plate, air filters, and filter end cover.

11.Replace fan guard and upper shell.

12.Adjust pump pressure (see page 14).

Note: If rotor is still binding, proceed as follows.

13.Perform steps 1 thru 6 above.

14.Place fine grade sandpaper (600 grit) on flat surface. Sand rotor lightly in “figure 8” motion four times (see Figure 28).

15.Reinstall insert and rotor.

16.Perform steps 10 thru 12 above.

Blade

Air

Pump Intake

Plate Filter

Filter End

Cover

Fan Guard

Insert

Rotor

Air Output

Filter

Figure 25 - Rotor Location, 30/70,000 Btu/Hr Models

Pump

Blade Plate

Air Intake

Filter

Filter End

Cover

Fan Guard

Insert

Rotor

Air

Output

Filter

Figure 26 - Rotor Location, 90/150,000 Btu/Hr Models

Gap Adjusting

Screw

 

.076/.101 mm (.003"/.004") Gap

 

Measured With Feeler Gauge

 

Sandpaper

Blade

Rotor

Gap

 

Adjusting

 

Screw

 

Figure 27 - Gap Adjusting

 

Screw Locations

Figure 28 - Sanding Rotor

17

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Page 17
Image 17
Desa BY30CE, BY150CE, BY100CE, BY70CE owner manual Pump Rotor, Rotor Location, 30/70,000 Btu/Hr Models

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