70,000 Btu/Hr H.S.I. Series

PORTABLE FORCED AIR HEATERS

SERVICE

PROCEDURES

Continued

PUMP ROTOR

(Procedure if Rotor is Binding)

1.Remove upper shell (see page 7).

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 17). 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 page 7). 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 Fig- ure 18).

15.Reinstall insert and rotor.

16.Perform steps 10 through 12 above.

Blade

Pump Plate

Air Intake Filter

Filter End

Cover

Insert

Rotor

Air Output

Filter

TOR

PFA/P 056

Fan Guard

Figure 16 - Rotor Location

Gap Adjusting Screw

Blade

.003"/.004" Gap Measured With Feeler Gauge

Rotor

Gap Adjusting Screw

Figure 17 - Gap Adjusting Screw Locations

Sandpaper

Figure 18 - Sanding Rotor

REPLACEMENT PARTS

Note: Use only original replacement parts. This will protect your warranty coverage for parts replaced under warranty.

PARTS UNDER WARRANTY

Contact authorized dealers of this product. If they can’t supply original replacement part(s), call DESA International’s Techni- cal Service Dept. at 1-800-323-5190.

When calling DESA International, have ready:

•your name

•your address

•model number of your heater

•how heater was malfunctioning

•purchase date

Usually, we will ask you to return the defec- tive part to the factory.

PARTS NOT UNDER

WARRANTY

Contact authorized dealers of this product. If they can’t supply original replacement part(s), call DESA International’s Parts Department at 1-800-972-7879 for referral information. Parts Centrals are listed in the Authorized Service Center booklet supplied with heater.

When calling DESA International, have ready:

•model number of your heater

•the replacement part number

TECHNICAL

SERVICE

You may have further questions about op- eration or troubleshooting. If so, contact DESA International’s Technical Service Dept. at 1-800-323-5190.

You can also visit DESA International’s technical services web site at www.desatech.com.

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Desa B70D, R70D Replacement Parts, Technical Service, Pump Rotor, Parts Under Warranty, Parts not Under Warranty
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R70D, B70D specifications

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