Owner's Manual

Dayton Operating Instructions and Parts Manual
4
Dayton Natural Gas
Construction Heater
®
3VH21
Installation
Review and
understand the
warnings in the Safety Information
Section. They are needed to safely
operate this heater. Follow all local
codes when using this heater.
Test all gas piping
and connections
for leaks after installation or servicing.
Never use an open flame to check for a
leak. Apply a mixture of liquid soap
and water to all joints. Bubbles
forming show a leak. Correct all leaks
at once.
1. Provide natural gas supply system.
2. Install plumbing from natural gas
supply system to heater. Provide
minimum 4 PSI gas pressure to heater.
If gas supply pressure is over 4 PSI, use
high pressure regulator (provided).
3. Connect gas supply to heater using
minimum 3/8" i.d. hose. Maximum
hose length is 10 feet.
4. Connect hose or plumbing to 1/2" SAE
flare fitting at the valve inlet. Tighten
all fittings with a wrench.
5. Open natural gas supply valve slowly.
Check all connections for leaks. Never
use an open flame to check for a leak.
Ventilation
Provide at least a
7.5-square-foot
opening of fresh, outside air while
running heater. If proper fresh, outside
air ventilation is not provided, carbon
monoxide poisoning can occur. Provide
proper fresh, outside air ventilation
before running heater.
FRESH OUTSIDE AIR OPENING REQUIREMENTS
Heater Size Square feet opening
250,000 Btu/Hr 7.5
Apply mixture of liquid soap and water
to gas joints. Bubbles forming show a
leak that must be corrected. Correct all
leaks at once.
6. Close natural gas supply valve.
INSTALLING HIGH PRESSURE REGULA-
TOR
If the inlet supply pressure is above 4 psi,
you must use the high pressure regulator
(supplied). Follow the instructions below
to install regulator.
1. Install pipe or flexible connector (not
supplied) from gas supply to high
pressure regulator. Pipe or flexible
connector must be a minimum of 3/8"
i.d. with a maximum lenth of 10 feet.
Attach pipe or flexible connector to
inlet of regulator. The female threads
of the regulator are 1/2 npt. Note: The
natural gas supply must deliver 250
CFH of natural gas at 4 psi pressure for
each heater connected to the system.
2. Mount regulator to heater base below
piezo ignitor button (see Figure 3). Use
1/4-20 screws from hardware bag to
attach regulator to heater. Mount
regulator so the outlet with male
connector points toward the heater inlet.
3. Attach the 1/2" copper fuel tube
(supplied) to male connector on
regulator. Attach other end of fuel
tube to heater inlet. Firmly tighten fuel
tube flare nuts onto each fitting.
4. Open natural gas supply valve slowly.
Check all connections for leaks. Never
use an open flame to check for a leak.
Apply mixture of liquid soap and water
to gas joints. Bubbles forming show a
leak that must be corrected. Correct all
leaks at once.
5. Close natural gas supply valve.
6. Follow steps under To Start Heater in
the OPERATION section (page 5) of this
manual.
Figure 3 - Installing Regulator
Regulator
Copper Fuel Tube
Screws