5
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Operation
Instructions
1. Heater must be properly installed
before operation.
2. After heater is completely assembled,
rotate thermostat knob counter -
clockwise until control stops. This
is the minimum heat setting.
3. Turn power supply to heater “ON”
at main service panel.
4. Heater should not operate. If it
operates disconnect power and
recheck wiring.
5. Rotate thermostat clockwise until
it stops (maximum heat setting).
6. Heater should turn on after a brief
delay (see “Automatic Fan Delay”).
If heater and fan do not come on,
disconnect power and check wiring.
NOTE:
The first time you operate the
unit, it may smoke slightly. This is due
to the residual cleaning agents used
to clean the element when the heater
is manufactured. This is normal and
does not indicate a problem with the
unit. This condition will stop after the
heater has been in operation for a
few minutes.
7. Allow heater to continue to operate
until room temperature reaches
desired comfort level. Then rotate
thermostat knob counterclockwise
slowly until thermostat clicks off.
(Note that the fan delay will keep the
fan running until the elements cool.)
Heater will cycle on and off to
maintain room temperature.
8. It may be necessary to readjust
thermostat until exact comfort level
is attained. Rotation in the clockwise
direction will increase the amount
of time the heater will produce heat.
Rotation in the counterclockwise
direction will reduce the amount
of time the heater is on.
AUTOMATIC FAN DELAY
The heaters have an automatic fan
delay. When the thermostat calls for
heat, fan action is delayed momentarily
until the heating element warms. This
prevents the circulation of cold air.
When the heater raises the temperature
of the room to the thermostat set point,
the heating element is turned off but
the fan will continue to run until the
heating element cools down. This
prevents exposing the unit to residual
heat, provides a higher comfort level
and prolonged element life.
THERMAL SAFETY LIMIT
The heaters are equipped with a thermal
cutout which will automatically shut off
the heater in the event of overheating.
The heater will turn on when the
abnormal temperature returns to
normal. Should the unit overheat
and cause the thermal limit to cycle, a
red alarm light will illuminate to alert
the user that the heater is off and the
cause of the overheating should be
determined and corrective action
should be taken before further
operation.
NOTE:
If the unit is installed in an area
where the temperature is below 50°F,
the fan may cycle on and off until the
temperature in the room rises above
50°F, this is normal and does not
indicate a problem with the unit. As
soon as the heater warms the air in
the room above 50°F, the unit will
operate normally.
ADJUSTING AIRFLOW DIRECTION
1. Turning the Unit – If the unit has
been installed with a single lag bolt,
as shown in Figure 4a, simply turn
the entire unit as needed to adjust
airflow.
2. Tilting the unit – Loosen the bracket
screws, tilt the heater to the desired
position, and retighten the bracket
screws (see Figure 5).
NOTE:
To tilt the heater it must be
mounted in bottom keyhole slots of
mounting brackets to maintain
adequate clearance and prevent
possible overheating.
Models 3UG73E and 3UG74E
Dayton Operating Instructions and Parts Manual
Figure 10
Figure 11
Heating
Element
Fan and Motor
Protective
Grill