Desa BTU/HR - Manual (Page 10)

www.desatech.com 113282-01C 10
SERVICE PROCEDURES
Continued
Figure 15 - Air Output, Air Intake, and Lint
Filters, 110/115/155/165/200 Models Only
Air Intake Filter
Filter End
Cover
Lint Filter
Air Output Filter
6. Replace filter end cover.
7. Replace fan guard and upper shell.
IMPORTANT:
Do not oil filters.
PUMP PRESSURE ADJUSTMENT
1. Remove pressure gauge plug from filter end
cover (see Figure 16).
2. Install accessory pressure gauge (part num-
ber HA1180).
3. Start heater (see Operation, page 5). 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 correct
pressure for each model (see Figure 17).
5. Remove pressure gauge. Replace pressure
gauge plug in filter end cover.
Figure 16 - Pressure Gauge Plug
Removal (40/55/60/70 Models Shown)
Pressure
Gauge
Plug
Pressure
Gauge
Figure 17 - Adjusting Pump Pressure
(40/50/55/60/70 Models Shown)
Relief
Valve
Pump
Model Pressure
40 3.0 PSI
50 3.4 PSI
55 3.4 PSI
60 3.4 PSI
70 4.7 PSI
110 5.1 PSI
115 5.1 PSI
155 5.2 PSI
165 5.6 PSI
200 6.2 PSI
FUEL FILTER
1. Remove side cover screws using 5/16" nut-
driver.
2. Remove side cover.
3. Pull upper fuel line off fuel filter neck (see
Figure 18 or 19).
4. Carefully pry bushing, fuel filter, and lower
fuel line (110/115/155/165/200 Models only)
out of fuel tank (see Figure 19).
5. Wash fuel filter with clean fuel and replace in tank.
6. Attach upper fuel line to fuel filter neck.
7. Replace side cover.
Figure 18 - Fuel Filter Removal,
40/50/55/60/70 Models
Fuel Filter and
Bushing
Side Cover
Upper Fuel Line
Fuel Filter, Bushing,
and Lower Fuel Line
Upper Fuel Line
Side
Cover
Figure 19 - Fuel Filter Removal,
110/115/155/165/200 Models