103887-01F
3
3
For more information, visit www.desatech.com
For more information, visit www.desatech.com
PRODUCT IDENTIFICATION
UNPACKING
THEORY OF OPERATION
NATURAL GAS SUPPLY
VENTILATION
PRODUCT IDENTIFICATION
Figure 1 - 150,000 Btu/Hr Model
Hot Air Outlet
(Front)
Handle
Fan
Guard
Upper Shell
On/Off
Switch
Power Cord
Inlet Connector
Lower Shell
Thermostat Knob
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 Fuel System:
The gas supply attaches to the heater by a
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 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.
Air For Combustion
And Heating
Fuel
Combustion
Chamber
DSI
Ignitor
Figure 2 - Cross Section Operational View
Clean
Heated
Air Out
(Front)
Cool Air
In (Back)
Fan
Motor
On/Off
Switch
Solenoid Valve
Nozzle
Internal
Regulator
Power
Cord
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.
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.
VENTILATION
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.
