SANDENVENDO AMERICA INC
1213686J ECN 57413
8
OPERATION
Display and Keypad
Timer Setting and Operation
Note: to help prevent keypad damage, push keypad buttons only with finger or thumb; do not use
fingernail, utensil, tool, pen, or other object.
Circulation fans may be turned on or off by the switch at the top rear of the HFD (HFD 7 and HFDC).
Normal Operation
Pressing the
I/O
button turns the HFD on or off. When controller is off, all lamps, heaters, displays
and indicators are off. Front on/off button (HFDC only): press and hold for 5 seconds to turn the
HFDC on or off.
Timers
Holding down the
TIME
button, then pressing a
Timer
button, turns off the timer. When a timer is off,
pressing the
Timer
button once sets the countdown timer to the value preprogrammed into the
controller.
Pressing the
Timer
button again within three seconds (while the indicator next to the button is
blinking) sets the timer to 30 minutes.
Each successive press (within three seconds) adds 30 minutes to the time, up to 4 hours.
At 4 hours, the next button press cycles the timer back to 30 minutes again.
Once the timer is activated, the
LED
next to the shelf timer button stops blinking and stays on.
The display then reverts to HFD internal air temperature.
While a timer is on, pressing a timer button displays the remaining time for 4 seconds, then shelf
actual temperature (not the setpoint) for 4 seconds, and then the display reverts to the internal
ambient temperature display.
At 15 minutes remaining time, the
LED
turns yellow.
When no time remains, the
LED
turns red, plus an audible alarm sounds. Shelf heaters stay on.
Pressing the timer button next to the blinking red
LED
clears the alarm and restarts the timer.
Converting Temperature from °F to °C (or °C to °F)
With controller power off, hold down the
TIME
button, then press and hold the
I/O
button until the
display comes on. The display shows the firmware revision (example 4.11).
Press and release the
TIME
button to change from °F to °C (or °C to °F).
Push the
I/O
button to turn on the HFD and lock in this setting.
Ambient Temperature Display
I/O
button
USB port
Timer
adjustment: Use buttons to adjust
shelf temperature and timers down or up
Upper left shelf
(except HFDM)
Middle left shelf
(except HFDM)
Upper right shelf
Middle right shelf
Lower right shelf
TIME
button
Lower left shelf
LED
s for timers and adjustment
