Operating Instructions - Berner CHD10 Series Installation & Maintenance Instructions Manual

VII. OPERATING INSTRUCTIONS
A. GENERAL OPERATION
Air curtain operation may be divided into four areas: control
package, fan activation, fan speed selection, and heat
activation. Depending on the type of controls ordered one
or more of the following may be applicable. The air curtain
must be properly installed before it is used.
1. Control packages control the air curtain's sequence of
operation. Unit modes/control packages are built into
the unit and may not be changed in the field.
Refer to your wiring diagram for specifics about activation
connections and sequence of operation.
a. Basic Control Package – The unit is activated by
a door or selector switch. Either switch may be line
voltage or low voltage (24V).
b. Deluxe Control Package – The unit is activated
by a door or selector switch, but has a factory installed
time delay allowing the unit to keep running for a
period of time after the door closes.
c. Comfort Plus Control Package – Available only on
heated units, the unit is activated by a door or
selector switch AND a thermostat to provide
supplemental heating. NOTE: Not available with 575V
motors.
2. Unheated air curtains will have the fans activated by a
door or selector switch or sensor. The unit may be single
speed and require no fan speed selector (On/Off ), or may
have three fan speeds which require either a unit or
remote mounted switch (Off, High, Med, Low).
3. Heated air curtains will have fans activated by a door or
selector switch or sensor, but may also be activated by
the thermostat in Comfort Plus Mode. The unit has
three fan speeds which can be set by either a unit or
remote mounted switch (Low, Med, High, Off, Low heat,
Med Heat, High Heat).
4. Heat activation is controlled by either a unit or remote
mounted thermostat, and a unit or remote mounted
switch.
B. AIR STREAM ADJUSTMENT
1. With the air curtain operating and the door in its full open
position, check to see that nothing is obstructing the
airflow at the discharge nozzle vanes.
2. Find the air stream split location. Hold a handkerchief
by its corners, approximately 12" above the floor. Gently
move the handkerchief back and forth in the doorway.
Make sure the air is being directed to both the inside
and the outside. See Figure 10. The split location is
indicated where the handkerchief is vertical with minimal
or no fluttering.
3. The split location should be approximately 3" outside the
doorway. If necessary adjust the discharge nozzle vanes
by de-energizing the unit, loosening the nozzle vane
locking screws and adjusting vanes.
EXTERIOR INTERIOR
8
AIR AIR
EXTERIOR
12"
FIGURE 10
INTERIOR