Desa 5 (70, 44 kW (150, 8 (30, 4 (90, 20, 26, 000 Btu/Hr) owner manual Pump Rotor

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

Blade

Air

Pump Intake

Plate Filter

Filter End

Cover

Fan Guard (26,4

kW [90,000 Btu/

Hr] Model Shown)

Insert

Rotor

Air Output

Filter

Figure 31 - Rotor Location, 8,8/20,5 kW (30/70,000 Btu/Hr) Models

	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 .003"/.004"
	(.076/.101 mm) if needed
	(see Figure 33).

Note: Rotate rotor one full turn to insure the gap is

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

Blade

Insert

Rotor

Air

Output

Filter

Pump

Plate

Air

Intake

Filter

Filter End

Cover

Fan Guard

(26,4 kW [90,000 Btu/ Hr] Model Shown)

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 34).

15.Reinstall insert and rotor.

16.Perform steps 10 thru 12 above.

18

Figure 32 - Rotor Location, 26,4/44 kW (90/150,000 Btu/Hr) Models

Gap Adjusting

Screw

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

Feeler Gauge

Sandpaper

Blade Rotor

Gap

Adjusting

Screw

Figure 33 - Gap Adjusting
Screw Locations	Figure 34 - Sanding Rotor

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