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heat on/off switch; the heater is operated via the
thermostat.
2. Unheated units have one rheostat switch that turns the
unit on or off and provides fan speed control.
3. Heated units have: 120V – one rheostat switch per
motor, 208/240V - one rheostat switch per unit, that
turns the unit on or off and provides fan speed
control, and another switch that turns on or off the
electric heater. Units outfitted with remote rheostats do
not have a heat on/off switch.
4. The air curtain may also be automatically operated by a
combination of the rheostat switch and a remote door
switch and/or thermostat (See the wiring diagram).
B. RHEOSTAT FIELD ADJUSTMENT
1. Locate the hole in the nameplate for access to the adjust-
ing screw.
2. Insert small Phillips screwdriver in hole and gently turn
POT in proper direction to change speed.
3. A very small degree of rotation is required to change speed,
wait for speed to settle, then change a little more if needed.
4. Test full range, turn knob to high speed to check for
variation.
5. Ambient unit low speed should be about 1050 RPM,
Electric heated unit low speed should be about 1250 RPM.
See FIGURE 7.
WARNING: SETTING POT TOO HIGH MAY CAUSE MOTOR
TO STALL ON LOW SPEED.
IF SPEED IS TOO LOW ON ELECTRIC HEATED UNITS, YOU
CAN CREATE ABNORMAL POTENTIALLY HAZARDOUS
TEMPERATURES CAUSING THE HEATERS TO TRIP OUT THE
THERMAL CUTOUTS INTERMITTENTLY.
C. AIR STREAM SPLIT ADJUSTMENT
1. With the air curtain operating and the window is in its full
open position, check to see that nothing is obstructing
the air flow at the discharge nozzle vanes.
2. Find the air stream split location. Hold a handkerchief, by
its corners, approximately 12" above the counter. Gently
move the handkerchief back and forth in the window.
Make sure the air is being directed to both the inside
and the outside. The split location is indicated where the
handkerchief is vertical with minimal or no fluttering.
See FIGURE 8.
3. Adjust the discharge nozzle vanes so the split location
is approximately 3" outside the opening. This is accom-
plished by de-energizing the unit, loosening the nozzle
vane locking screws and adjusting vanes.
VII. MAINTENANCE AND CLEANING
CAUTION: ELECTRIC SHOCK HAZARD Disconnect power
whenever servicing air curtain unit. More than one discon-
nect may be required to de-energize air curtain unit.
Keep your air curtain operating at peak efficiency by cleaning
the blower wheels, motor(s) and intake grille. Buildup of dust
on the blower wheels can cause vibration, noise and excessive
wear on the motor bearings. The frequency of cleaning will
depend on the environment in which the unit is operating.
Dirty, dusty or greasy environments could require a cleaning
schedule of once every two months. If the environment is
not that dirty, the unit(s) should be scheduled for cleaning a
minimum of once every (6) months.
FIGURE 6 - Electrical Connections
FIGURE 7 - Rheostat Field Adjustment
-5-
Wiring
Compartment
Cover
½" Knockout
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