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PRODUCT IDENTIFICATION
Hot Air Outlet
(Front)
Upper Shell
Lower Shell
On/Off
Switch
Figure 1 - 150,000 Btu/Hr Model
UNPACKING
1. Remove all packing items applied to heater for shipment. Keep
plastic cover cap (attached to inlet connector) 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.
4.
Hose not included. User must supply hose or flexible connector.
THEORY OF OPERATION
The gas supply attaches to the heater by a
The Fuel System:
minimum 3/4 inch i.d. hose or flexible connector. User must supply
hose or flexible connector. The length should be no more than 10
feet long. The natural gas moves through the solenoid valve and the
internal regulator and out the nozzle.
The motor turns the fan. The fan pushes air into and
The Air System:
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:
down if the flame goes out.
103887-01C
Handle
Power Cord
Thermostat Knob
Inlet Connector
This system causes the heater to shut
For more information, visit www.desatech.com
For more information, visit www.desatech.com
Combustion
Chamber
Clean
Heated
Air Out
(Front)
Fan
Guard
Figure 2 - Cross Section Operational View
NATURAL GAS SUPPLY
The user must furnish the natural gas supply and the connections to
the heater.
Regulate the natural gas supply down from a minimum 5 inches
water column to a maximum of 1/2 psi. The natural gas supply
capacity should be able to supply a minimum of 150 cubic feet of gas
at pressure for each heater connected to the system.
Consult your natural gas supplier for proper sizing of the natural gas
supply lines.
Follow all local ordinances and codes. In the absence of local
ordinances and codes, refer to the National Fuel Gas Code Hand-
book, NFPA54/ANSI Z223.1 and the Natural gas Installation Code,
CAN/CGA B149.1.
VENTILATION
WARNING: Follow the minimum fresh, outside air
ventilation requirements. If proper fresh, outside air
ventilation is not provided, carbon monoxide poison-
ing can occur. Provide proper fresh, outside air ven-
tilation before running heater.
Provide a fresh air opening of at least three square feet for each
100,000 Btu/Hr rating. Provide extra fresh air if more heaters are
being used.
PRODUCT IDENTIFICATION
UNPACKING
THEORY OF OPERATION
NATURAL GAS SUPPLY
VENTILATION
Ignitor
Nozzle
DSI
Internal
Solenoid Valve
Regulator
Air For Combustion
And Heating
3 3
Fan
Motor
Cool Air
In (Back)
Power
On/Off
Cord
Switch
Fuel
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