Desa 20 - Manual (Page 14)

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Air Output, Air Intake,
and Lint Filters
1. Remove upper shell (see
page 10).
2. Remove filter end cover
screws using 5/16" nut-
driver.
3. Remove filter end cover.
4. Replace air output and lint
filters.
5. Wash or replace air intake
filter (see Preventative
Maintenance Schedule,
page 8).
6. Replace filter end cover.
7. Replace fan guard and
upper shell.
IMPORTANT: Do not oil
filters
Filter End
Cover
Air Output
Filter
Figure 20 - Air Output, Air Intake, and Lint Filters,
8,8/20,5 kW (30/70,000 Btu/Hr) Models
Air Intake Filter
Filter End
Cover
Air Output
Filter
Figure 21 - Air Output, Air Intake, and Lint Filters,
26,4/44 kW (90/150,000 Btu/Hr) Models
Pump Pressure
Adjustment
1. Remove pressure gauge
plug from filter end cover.
2. Install accessory pressure
gauge (part number
HA1180).
3. Start heater (see Operation,
page 7). Allow motor to
reach full speed.
4. Adjust pressure. Turn relief
valve to right to increase
pressure. Turn relief valve
to left to decrease pressure.
See specifications at right
for correct pressure for
each model.
5. Remove pressure gauge.
Replace pressure gauge
plug in filter end cover.
Fan Guard
(26,4 kW [90,000
Btu/Hr] Model
Shown)
Model Pump Pressure
8,8 kW (30,000 Btu/Hr) 17,93 kPa (2.6 PSI)
20,5 kW (70,000 Btu/Hr) 26,20 kPa (3.8 PSI)
26,4 kW (90,000 Btu/Hr) 30,34 kPa (4.4 PSI)
44 kW (150,000 Btu/Hr) 33,78 kPa (4.9 PSI)
Figure 22 - Pressure Gauge Plug Removal
Relief
Valve
(8,8/20,5 kW [30/70,000 Btu/Hr] Models Shown)
Figure 23 - Adjusting Pump Pressure
Pressure
Gauge
Lint Filter
Air Intake Filter
Fan Guard
Lint Filter
Pressure
Gauge
Plug