Carter-Hoffmann VCNH2W3S - Manual (Page 7)

7
CONTROLLER PROGRAMMING INSTRUCTIONS
The controller (part number 18616-0333) has been factory pre-set for a holding temperature of 175°F
(80°C) and an alarm set point of 140
°F (60°C). In most cases, these set points will not need to be
changed. However, if changes are necessary, the controller is programmable.
Lockout Feature: The cabinet has a lockout feature for controller programming. The lockout feature
must be disabled in order to enable programming of the Temperature or Alarm set points. Press ei-
ther the TEMPERATURE or ALARM button and release; then press the UP or DOWN arrows in the
following sequence within 5 seconds: UP, UP, DOWN, UP, DOWN, UP. The programming function
will now be enabled. Use the current programming process, shown below, to set the parameters for
TEMPERATURE or ALARM set points shown below. When a button has not been pressed for 5 sec-
onds, the controller will exit the programming function and return to the controller lockout process.
To View or Change Temperature Scale: The cabinet is programmable for a temperature scale in
degrees Fahrenheit and Centigrade (Celsius). Turn power OFF. Hold down both arrow buttons. While
holding both arrows, turn power back ON. Display will show current scale (C or F). To change the
scale, push the up or down arrow. Turn power OFF to save your changes.
To View or Change the Temperature Set Point: Turn power ON. To view the temperature set
point, press and hold the temperature set button and press the up or down arrow button until the de-
sired air temperature is displayed. The display will advance in 1
° increments.
To View or Change Alarm Set Point: Turn power ON. To view the alarm set point, press and hold
the alarm reset button and press the up or down arrow button until the desired alarm temperature is
displayed. The display will advance in 1
° increments.
Changing the Temperature Range: The temperature range that this cabinet is designed within
should be programmed for 210
°F (93°C) Maximum and 140°F (60°C) Minimum. The cabinet operat-
ing temperature can be programmed to operate within these two set points.
1. Turn power OFF.
2. Press and hold the UP and DOWN arrow buttons. While holding the buttons, turn cabinet power
back ON. The display will read: Ser F and then F will display (if temperature scale is set to F).
3. To change to range, press and release the TEMPERATURE button. The display will read: rLo
and then the current low temperature range set point.
4. To change the temperature, press the UP or DOWN arrows until the desired temperature is dis-
played. The low setting should be set to 140 °F.
5. Press the TEMPERATURE button again. The display will read Rhi and then the current high tem-
perature range set point.
6. To change the temperature, press the UP or DOWN arrow buttons until the desired temperature
is displayed. The high setting should be set to 210 °F.
7. To save the changes into the controller memory, turn the cabinet power OFF.