Desa RM60 owner manual Nozzle Assembly, Pump Rotor

60,000 Btu/Hr H.S.I. Series

PORTABLE FORCED AIR HEATER

SERVICE

PROCEDURES

Continued

NOZZLE ASSEMBLY

1.	Remove upper shell (see page 6).
2.	Remove fan (see page 6).
3.	Remove fuel and air line hoses from

		Nozzle Face
Combustion		Nozzle Seal
Chamber	Nozzle/Adapter
	Assembly
		Nozzle
		Nozzle Adapter

	nozzle assembly (see Figure 11).
4.	Turn nozzle assembly 1/4 turn to left
	and pull toward motor to remove (see
	Figure 12).
5.	Place plastic hex-body into vise and
	lightly tighten.
6.	Carefully remove nozzle from the
	nozzle adapter using 5/8" socket
	wrench (see Figure 13).
7.	Blow compressed air through face of
	nozzle. This will free any dirt in
	nozzle area.
8.	Inspect nozzle seal for damage.
9.	Replace nozzle into nozzle adapter un-
	til nozzle seats. Tighten 1/3 turn more
	using 5/8" socket wrench (40-45 inch-
	pounds).
10.	Attach nozzle assembly to burner strap.
11.	Attach and route fuel and airline hoses
	to nozzle assembly as shown (see Fig-
	ure 11). Route photo cell wires as
	shown in Figure 11.
12.	Replace fan (see page 6).
13.	Replace fan guard and upper shell.

Combustion

Chamber

Burner

Strap

Nozzle/

Adapter

Assembly

Air Line Hose	Photocell
	Wires
	Fuel Line Hose

Figure 11 - Removing Air and Fuel Line Hoses

Figure 12 - Removing Nozzle/Adapter Assembly

PUMP ROTOR

(Procedure if Rotor is Binding)

1.Remove upper shell (see page 6).

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 .003"/.004" if needed (see Figure 15).

Note: Rotate rotor one full turn to in- sure the gap is .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 Pump Pres- sure Adjustment, page 6).

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

13.Perform steps 1 through 6 above.

14.Place fine grade sandpaper (600 grit) on flat surface. Sand rotor lightly in “figure 8” motion four times (see Figure 16).

15.Reinstall insert and rotor.

16.Perform steps 10 through 12 above.

Air Line Fitting

Fuel Line Fitting

Figure 13 - Nozzle and Nozzle Adapter

Blade

Pump Plate

Air Intake Filter

Filter End

Cover

Insert

Rotor

Air Output

Filter

Fan Guard

Figure 14 - Rotor Location

Blade Gap Adjusting Screw

.003"/.004"

Gap

Measured

With

Feeler

Gauge

Rotor

Gap Adjusting Screw

Figure 15 - Gap Adjusting Screw Locations

Sandpaper

Figure 16 - Sanding Rotor

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