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Version B - For Reduction G016.J
®
Dayton Operating Instructions and Parts Manual
5
Model 3VG78
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.
4. Open natural gas supply valve slowly.
5. Check all connections for leaks.
Operation
Review and
understand the
warnings in the Safety Information
section, pages 2 and 3. 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 into front or rear of heater.
3. Plug power cord of heater into a three-
prong, grounded extension cord.
Extension cord must be at least six feet
long. Extension cord must be UL listed.
EXTENSION CORD WIRE SIZE
REQUIREMENTS
Up to 50 feet long, use 18 AWG rated
cord.
51 to 100 feet long, use 16 AWG rated
cord.
101 to 200 feet long, use 14 AWG rated
cord.
4. Plug extension cord into a 120 Volt/60
Hertz, three-hole, grounded outlet.
5. Open natural gas supply valve slowly.
Storage
Disconnect heater
from natural gas
supply.
1. Place plastic cover caps over brass
fittings on inlet connector.
2. Store in dry, clean, and safe place. Do
not store hose inside heater combus-
tion chamber.
3. When taking heater out of storage,
always check inside of heater. Insects
and small animals may place foreign
objects in heater. Keep inside of heater
free from combustible and foreign
objects.
Maintenance
Never attempt to
service heater
while it is plugged in, connected to
natural gas supply, operating, or hot.
Severe burns and electrical shock can
occur.
1. Keep heater clean. Clean heater
annually or as needed to remove dust
and debris. If heater is dirty or dusty,
clean heater with a damp cloth.
2. Inspect heater before each use. Check
connections for leaks. Apply mixture of
liquid soap and water to connections.
Bubbles forming show a leak. Correct
all leaks at once.
3. Have heater inspected yearly by a
qualified service person.
4. Keep inside of heater free from
combustible and foreign objects.
6. Turn thermostat control knob fully
counterclockwise to the "COOLER"
position. Turn ON/OFF switch to the ON
position. Turn thermostat control knob
slowly clockwise until electric motor and
fan begin to run. Heater will start in
approximately 3 seconds. Adjust
thermostat control knob to WARMER or
COOLER setting as needed.
NOTE: If heater does not start after 3
seconds, the ignition control will automati-
cally attempt to start heater one time. If
heater fails to start on this attempt, the
safety control will "lock out" and no further
automatic restarts will be attempted. This
could occur if air remains in fuel line. If
heater fails to start on this attempt, turn ON/
OFF switch to OFF position. Wait ten seconds
for safety control to reset, then turn ON/OFF
switch back to ON position and try to start
heater again.
7. Thermostat Operation Only: During
normal thermostat operation, heater
will cycle off when air temperature
rises to thermostat setting. When air
temperature drops sufficiently below
thermostat setting, the electric motor
and fan will begin to run. After 15 to
60 seconds, heater burner should
automatically ignite and provide heat
to maintain temperature setting.
TO STOP HEATER
1. Tightly close natural gas supply valve.
2. Wait a few seconds. Heater will burn
gas left in supply hoses.
3. Turn on/off switch to the OFF position.
4. Unplug heater.
Installation (Continued)
6. Close natural gas supply.