Operating Your Heater; Caring For Your Heater - Williams 3144030 Owner's Manual

Operating Your Heater

The heater is controlled by means of 24 volt, wall-mounted
thermostat. When the thermostat circuit is energized, low
voltage relays are actuated which close circuits to the heating
element and blower motor. The relay actuates after thermostat
calls for "turn on" or "turn off".
Protection against overheating is provided by means of a limit
switch located near heating elements, which acts to open relay
circuits controlling the heated elements if circulating air volume
is decreased. The limit switch automatically restores operation
when temperatures reach a normal level. As an additional
safeguard, each heating element is equipped with fuse limiters
to protect against excessive and prolonged current surges. If
these protectors open the heating circuit, the heat limiter must
be replaced by your Service Technician who will determine and
correct the cause of failure.

Caring for Your Heater

Annual Upkeep Needed
Heating Element and Optional Rear Outlet
Keep clean at all times. Clean all foreign materials from rear
outlet and top of heating element. Use a soft brush or
vacuum cleaner.
For access to heating element, remove (2) screws (Figure 1
on page 6) and grasp face panel near bottom and pull up
and out.
After cleaning back of optional rear outlet and heating
element, replace face panel.
Motor and Fan
For maximum motor life of fan, the manufacturer
recommends the fan be inspected yearly, dust blown out
of the ventilating holes and a few drops of #20 non-
detergent oil added to bearing cavity (Figure 13).
To get to the motor:
1. Take out four screws holding fan shroud to side
flanges of cabinet and remove shroud (Fig ure 1
on page 6).
2. Before removing the fan blade, remember its position
by examining the blade nut and the amount of shaft
visible. Scribe or mark the motor shaft in order to
reinstall the fan blade to its original place on the shaft.
3. Using wrench provided, loosen 5/32-inch "Allen head"
set screw holding fan blade to motor shaft and
remove the fan blade.
4. To replace fan blade, reverse steps 1-3 above.
DANGER OF BODILY INJURY OR DEATH
TURN OFF ELECTRIC
DISCONNECT SWITCH, FUSE BOX OR SERVICE PANEL
BEFORE REMOVING ANY DOORS OR ACCESS OR
SERVICE PANELS FROM UNIT.
WARNING
POWER SUPPLY
Air volume may be adjusted at the operational rear grilles, if so
equipped. Do not attempt to reduce flow of air from main panel
(front) grille. To do so would cause shutdown through the high
limit control. For best heating results, do not obstruct air flow by
placing furniture in front of outlets. Make sure the free flow of
air returning to the blower is not reduced by closing doors
between heated spaces.
Appliance Area
For better circulation and more effective heating, do not place
obstructive furniture closer than 4 feet to the front of the
cabinet or 2-feet to the side of the cabinet.
SOURCE OF POSSIBLE IGNITION.
HIGH TEMPERATURE, KEEP COMBUSTIBLE
MATERIAL AWAY FROM FRONT OF HEATER.
The appliance area must be kept clear and free from
combustible material, gasoline and other flammable vapor
and liquids.
Cabinet Finish
Clean cabinet with damp rag. Never use abrasive cleaners.
Cabinets are finished in heat resistant baked enamel - DO NOT
refinish with wall paint.
FIGURE 13 – Motor Oil Hole
AT
CAUTION
15