20
JOHNSON® CONTROL - MR3CCUHV
Manual
Defrost
Button
Enter
Button
Fan
Status
LED
Defrost
Status
LED
Compressor
Status
LED
Up
Button
Down
Button
To Lock and Unlock The Unit for Programming
Press the Enter, Up, and
Down buttons in sequence
and hold them all down until
“- - -” is displayed. Hold for
about 10 seconds until the
current temperature is dis-
played. This toggles the key-
pad between locked and
unlocked.
To change the set point
1. Hold the Enter button
down for 3 seconds.
The display will change
to show the set point.
Release the Enter
button.
2. Press the Up or Down
button until you reach
the new set point.
3. Press the Enter button
to save the new set-
point.
Note:
If the Enter button is not pressed after select-
ing the new set point, the new set point is not saved,
and the control will revert to the original set point.
To Begin a Manual Defrost Cycle
Hold the Defrost button
down for 3 seconds.
To Begin a Deep Freeze Cycle
Press the Enter and Up but-
tons in sequence and hold
both for 5 seconds. The
compressor status LED will
light.
To Program Values Other Than The Setpoint
A parameter settings reference page is included in Table 3
of this bulletin. Filling out the parameter settings before
programming may be helpful.
1.
H
old the Enter button down
for about 10 seconds. The
display will change to HY.
2. Press the Up or Down button
until the desired parameter is
displayed.
3. Press the Enter button. The
parameter’s current value is
displayed.
4. Press the Up or Down button
until the desired value is
shown.
5. Press the Enter button to
save the new value. After
10 seconds of inactivity, the
display will return to its
normal function.
Note: If the Enter button is not pressed after selecting the
new value, the new value is not saved, and the control will
revert to using the previous value.
To Run the Self-Test Procedure
Press the Up and Down buttons
in sequence, and hold for 5
seconds.
IMPORTANT:
Disconnect loads before beginning
Self-test procedure. Cycle power to resume normal
operation.
