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Dayton Operating Instructions and Parts Manual
6
Dayton Propane and Natural Gas
Construction Heaters
®
3VH18A and 3VH19A
Operation
Review and
understand the
warnings in the General Safety Infor-
mation section. They are needed to
safely operate this heater. Follow all
local codes when using this heater.
TO START HEATER
1. Follow all installation, ventilation, and
safety information.
2. Locate heater on stable and level
surface. Make sure strong drafts do
not blow on heater.
3. Make sure unit is turned off by lightly
depressing and turning control knob
fully clockwise to OFF.
4. Open gas supply valve on gas supply
slowly.
NOTE: If not opened slowly, excess-flow
check valve on propane tank may stop gas
flow. If this happens, you may hear a click
inside the regulator assembly. This is the
check valve closing. To reset the excess
flow check valve, close propane supply
valve and open it again slowly.
5. Slightly depress and turn control knob
counterclockwise to the low position
(See Figure 6 or 7).
Figure 6 - Control Knob and Piezo Ignitor
Button Locations for Propane Model
3VH18A
Running heater
below specified
input rating may cause flashback.
During flashback, the burner flame is
mostly yellow. The flame will burn
inside the burner tube, causing a
roaring noise. If flashback occurs, turn
heater off. After burner tube cools,
restart the heater.
6. With the control knob pushed all the
way in, press and release the piezo
ignitor button. Keep pressing ignitor
button until the burner lights. Hold
control knob down for a maximum of
15 seconds while attempting ignition.
If heater does not ignite, release
control knob and wait 3 minutes
before attempting reignition.
NOTE: Keep hands and face away from
outlet (around top of shell) of heater while
attempting to start heater.
7. After ignition, hold control knob down
for approximately 30 seconds. This
activates the automatic control system.
8. When burner remains lit, set heater at
the desired heat level by slightly
depressing the control knob and
turning counterclockwise to the
Medium or High settings (See Figure 6
or 7).
9. If burner goes out, turn off gas.
Slightly depress and turn control knob
fully clockwise to OFF. For propane
model, check for adequate fuel supply.
Restart heater beginning at Step #1.
Off
Position
Start
/Low
Position
HIGH
MEDIUM
OFF
START/
LOW
MEDIUM
START/
LOW
HIGH
OFF
H
I
G
H
M
E
D
I
U
M
Piezo
Ignitor
Button
Control
Knob
Continue Turning Knob
Counterclockwise to
MED and HI
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 that must be
corrected. Correct all leaks at once.
Installation (Continued)
Figure 7 - Control Knob and Piezo Ignitor
Button Locations for Natural Gas Model
3VH19A
4. Open natural gas supply valve slowly.
5. Check all connections for leaks.
H
IG
H
STA
R
Off
Position
Start
/Low
Position
HIGH
MEDIUM
OFF
START/
LOW
MEDIUM
START/
LOW
HIGH
OFF
Piezo
Ignitor
Button
Control
Knob
6. Close natural gas supply valve.