Filter
Top Products
23
JOHNSON CONTROL - MR3CCUHV
R
888 Porter Rd. Muskegon, MI 49441 Phone: 231.798.8888 Fax: 231.798.4960 www.structuralconcepts.com
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 setpoint
1. Hold the Enter button
down for 3 seconds.
The display will change
to show the setpoint.
Release the Enter but-
ton.
2. Press the Up or Down
button until you reach
the new setpoint.
3. Press the Enter button
to save the new set-
point.
Note: If the Enter button is not pressed after select-
ing the new setpoint, the new setpoint is not saved,
and the control will revert to the original setpoint.
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 set-
tings before programming may be helpful.
1. Hold 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 in-
activity, the display will
return to its normal func-
tion.
Note: If the Enter button is not pressed after select-
ing 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 but-
tons in sequence, and
hold for 5 seconds.
IMPORTANT: Disconnect loads before beginning
Self-test procedure. Cycle power to resume normal
operation.