Owner's Manual

Version B - For Reduction G016.J
®
3
Model 3VH21
Dayton Operating Instructions and Parts Manual
Theory of Operation
THE FUEL SYSTEM: The gas supply
attaches to the heater by a minimum 3/8
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 regulator (if used) and through the
control valve, then out the nozzle.
THE IGNITION SYSTEM: The piezo ignitor
lights the burner fuel supply.
THE AUTOMATIC CONTROL SYSTEM:
The automatic control valve shuts off the
heater if the flame goes out.
Specifications
Output Fuel Size Weight
Model Rating Btu/Hr Fuel Consumption L x W x H (Inches) (pounds)
3VH21 250,000 Natural 250 cubic ft/hr 16 x 16 x 46 33 (Heater)
Gas Only 40 (Shipping)
Maximum Supply Maximum Supply to Minimum Supply Manifold
Pressure to Regulator Heater without Regulator Pressure to Heater Pressure
200 PSI 4 PSI 4 PSI 3.5 PSI
Product Identification
Figure 2 - Product Identification
Top
Emitter
Piezo Ignitor Button
Regulator/Fuel
Tube Assembly
Installed
Base
Base Shell
Main Burner
Valve Handle
Valve Inlet
Automatic
Control Valve
Button
Main Burner
Tube
Nozzle
Ignitor Electrode
Thermocouple
Shell
Natural Gas Supply
The user must furnish the natural gas
supply and the connections to the heater.
Regulate the natural gas supply down to a
minimum 4 PSI. If over 4 PSI is supplied,
then use the supplied regulator on the
heater. The natural gas supply capacity
should be able to supply a minimum of
250 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
Handbook, NFPA54/ANSI Z223.1 and the
Natural gas Installation Code, CAN/CGA
B149.2.Less gas is vaporized at lower
temperatures. Two or more 100-pound
tanks or one larger tank may be needed in
colder weather. Your local natural gas
dealer will help you select the proper
supply system.
Pilot Burner