Desa R35D Service Manual page 12

Hot Surface Ignition Models Service Manual
3 Check for Proper Pump Pressure
Install HA1180 Pressure Gauge or equivalent to rear of
air filter housing. Start heater and adjust air pressure to
specified pressure. Turn adjustment screw clockwise
to increase pressure and counterclockwise
crease pump pressure. The screwdriver must be removed
from the slot after any adjustment before taking a read-
ing on the gauge. (See Heater Performance Specifica-
tion on page 6 for specified pressures).
Note: Pressure gauge must be scaled in 1/4 pound in-
crements for accurate measurement.
For replacement parts contact:
4 Check for Restricted Fuel Flow
35,000 to 165,000 Btu Models Remove air and fuel lines
from nozzle adapter. Remove nozzle adapter/nozzle from
bracket.
to de-
200,000 Btu Model Remove ignitor (do not strike or bend
element) from bracket. Place in a safe location. Remove
air and fuel lines from nozzle adapter. Remove two
bracket screws and remove bracket, nozzle adapter, and
nozzle assembly from combustion chamber.
Using a 5/8" socket wrench, carefully remove the nozzle
from nozzle adapter. (Be extremely careful not to scratch
or score the face of the nozzle).
A. Seal Leak
Inspect nozzle seal or o-ring for damage. Replace if nec-
essary.
Combustion
Chamber
Nozzle Face
Nozzle
Nozzle Face
Nozzle
Nozzle
Adapter
Bracket
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12
Nozzle
Seal
Nozzle
Adapter
Air Line
Fitting
35,000 - 165,000 Btu Models
Nozzle
Seal
Air Line
Fitting
Fuel Line Fitting
200,000 Btu Models
Nozzle/
Adapter
Assembly
Fuel Line
Fitting
Nozzle
Adapter