Desa AT Series - Manual (Page 3)

103018-01G
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SAFETY INFORMATION
PRODUCT IDENTIFICATION
UNPACKING
THEORY OF OPERATION
SAFETY INFORMATION
Continued
PRODUCT IDENTIFICATION
Figure 1 - 375,000 Btu/Hr Models
REAR VIEW
Thermostat Knob
Power
Cord
Inlet Connector
On/Off Switch
Handle
Outer Shell
Hose/Regulator
Assembly
Hot Air Outlet (Front)
Fan
Guard
UNPACKING
1. Remove all packing items applied to heater for shipment. Keep
plastic cover caps (attached to inlet connector and hose/regu-
lator assembly) for storage.
2. Remove all items from carton.
3. Check all items for shipping damage. If heater is damaged,
promptly inform dealer where you bought heater.
• Never attach duct work to front or rear of heater.
• Use only original replacement parts. This heater must use de-
sign-specific parts. Do not substitute or use generic parts. Im-
proper replacement parts could cause serious or fatal injuries.
• Do not adjust regulator below 7 psig or above 20 psig.
Air For Combustion Air For Heating
THEORY OF OPERATION
The Fuel System: The hose/regulator assembly attaches to the
propane gas supply. The propane gas moves through the solenoid
valve and out the nozzle.
The Air System: The motor turns the fan. The fan pushes air into and
around the combustion chamber. This air is heated and provides a
stream of clean, hot air.
The Ignition System: The direct spark ignitor (DSI) sends voltage
to the ignitor. The ignitor ignites the fuel and air mixture.
The Safety Control System: This system causes the heater to shut
down if the flame goes out. The motor will continue to run, but no
heat is produced.
Cool Air
In (Back)
Motor
Nozzle
Power
Cord
Hose/
Regulator
Assembly
Solenoid
Valve
Ignitor
Combustion
Chamber
DSI
Figure 2 - Cross Section Operational View
Fan
Clean
Heated
Air Out
(Front)