3
OM-RR REACH-INS
OPERATION
CAUTION: DO NOT THROW ITEMS INTO THE STORAGE AREA. FAILURE TO
HEED THESE RECOMMENDATIONS COULD RESULT IN DAMAGE TO THE
INTERIOR OF THE CABINET.
REFRIGERATED CYCLE
Refrigerators
During the refrigeration cycle, the evaporator fans will run continuously even when
one or more doors are open. The door switch will activate the lights when opened.
1. Every 6 hours, the refrigeration system will turn off to allow the evaporator coil to
defrost. The controller now displays defrost symbol. When the coil temperature
reaches 41°F or after 20 minutes of defrost, the unit will turn on again.
2. Anti-condensation heaters on door frames work in conjunction with the
compressor.
3. The factory setting for the temperature range is 34°F to 38°F.
Freezers
During the refrigeration cycle, the controller supplies power to the condensing unit
and evaporator fan motors. The evaporator fans will run at any time when the
evaporator coil temperature is below 54°F. They will also keep running when door
is open but cycle off during a defrost period. The door switch will activate the lights
when opened.
1. Every 6 hours, the refrigeration system will turn off and electric heater will
turn on to defrost the evaporator coil. The controller now displays the defrost
symbol. When the coil temperature reaches 45°F or after 20 minutes of
defrost, the unit will turn on again.
2. Anti-condensation heaters on door frames work in conjunction with the
compressor.
3. The factory setting for temperature range is -7 to -3°F.
SOLID-STATE THERMOSTAT DESCRIPTIONS
Front Panel Commands
SET:
To display target set point; in programming mode it selects a
parameter or confirm an operation.
(DEF):
To start a manual defrost.
(UP):
To view the last alarm occurrence; in programming mode it browses
the parameter codes or increases the display value.
(DOWN):
To view the last alarm occurrence; in programming mode it browses
the parameter codes or decreases the display value.
+
:
To lock and unlock the keyboard.
SET +
:
To enter in programming mode.
SET +
:
To return to the room temperature display.
:
To switch the instrument off.
LED
MODE
DEFINITION
ON
Compressor enabled
FLASHING
Anti-short cycle delay enabled (AC parameter)
ON
Defrost in progress
FLASHING
Dripping in progress
ON
Fans output enabled
FLASHING
Fans delay after defrost
ON
Measurement unit
FLASHING
Programming mode
ON
Measurement unit
FLASHING
Programming mode
Main Functions
1. HOW TO SEE THE SET POINT
a. Push and immediately release the SET key: the display will show the set
point value.
b. Push and immediately release the SET key or wait for 5 seconds to display
the sensor value again.
2. HOW TO CHANGE THE SET POINT
a. Hold the SET key for more than 2 seconds to change the set point value.
b. The value of the set point will be displayed and the LED starts blinking.
c. To change the set value, push the
or
key within 10s.
d. To set new point value, push the SET key again or wait 10s.
3. HOW TO START A MANUAL DEFROST
a. Hold the key for more than 2 seconds and a manual defrost will start
4. HOW TO LOCK THE KEYBOARD
a. Hold the
and
keys together for more than 3s.
b. The “POF” message will be displayed and the keyboard will be locked. At
this point, it will be possible only to see the set point or the MAX or Min
temperature stored.
c. If a key is pressed more than 3s the ”POF” message will be displayed.
5. HOW TO UNLOCK THE KEYBOARD
a. Hold the
and
keys together for more than 3s until the “POF”
message is displayed.
Alarm Signals
1. HOW TO SEE THE ALARM AND RESET THE RECORDED ALARM
a. Push the
or
key to display the alarm signals.
b. When the signal is displayed, hold the
SET
key until the “rst” message is
displayed, and push the
SET
key again. The “rst” message starts blinking
and the normal temperature will be displayed.
MESSAGE
CAUSE
OUTPUTS
“P1”
Room probe failure
Compressor output according to par
“Con” and “COF”
“P2”
Evaporator probe failure
Defrost end is timed
“HA”
Maximum temperature alarm
Outputs unchanged
“LA”
Minimum temperature alarm
Outputs unchanged
“dA”
Door open
Compressor and fans restart
“EA”
External alarm
Output unchanged
“CA”
Serious external alarm (i1F=bAL)
All outputs OFF
“CA”
Pressure switch alarm (i1F=PAL)
All outputs OFF
