7
Operating Mode Display:
• Snowflake “ON” – compressor enabled in run
cycle; control displays current cabinet temperature.
• Snowflake “Flashing” – output display or anti short
cycle delay enabled to protect the compressor from
trying to start too frequently.
• Melting Snowflake “ON” – defrost in progress,
control displays the letters “dE” or “dF”
• To view the control’s programmed “Set Point”
(cut-out temperature): press and release the “Set
Key.”
• To initiate a manual, defrost cycle: press and hold
the “Manual Defrost Key” for more than 2 seconds.
Note: Manual Defrost will not initiate unless the unit is at
standard operating temperatures.
Electronic Control Startup:
Turn the switch, if equipped, into the ON position. After a
2-minute delay, the compressor and the condenser fan
should start. The evaporator fans and the interior light (if
equipped) will operate immediately when power is applied.
The condensing unit will continue to run until the air
temperature in the cabinet reaches +16°F (-9°C).
Note: The 2-minute delay will occur any time the unit is
turned off/loses power.
Note: If a defrost is required upon startup the controller will
enter defrost mode after the 2-minute delay. Normal
operation will resume upon defrost termination and a short
drip time.
Electronic Auto-Defrost Control Operation:
The electronic auto-defrost control is also located on top of
the merchandiser. The electronic control combines the
functions of both the mechanical thermostat and defrost
timer into a single control. The control also offers the
consumer the capability to monitor the operational status of
the vending machine via the icon and digital temperature
display (located on the face of the control). The control has
been programmed by Leer to operate the machine within the
design parameters of the refrigeration system. The set-point
(cut-out) for these controls has been set to 16°F (-9°C) with
a differential of 8°F (4°C). Should the user desire to alter the
set-point, the new set-points should not vary by more than
+/- 4°F (2.2°C) from the original factory setting. Do not
alter any of the programming parameters in the controls
without first consulting with Leer.
The electronic auto-defrost control contains two probe
wires. Both probe wires are routed through the cabinet’s
suction line hole and into the evaporator assembly, which is
mounted to the interior ceiling of the cabinet. The Red Air
Sensing Probe (“P1”) routes through the unit cooler and has
its sensing bulb secured to the outer, left-hand wall of the
unit cooler. Probe “P1” monitors the air temperature in the
merchandiser at that location. The Black Probe “P2” is
inserted into the finned section of the evaporator coil, near
the top of the evaporator assembly. This probe monitors the
temperature of the evaporator coil during the defrost cycle.
The control is factory programmed to engage in a defrost
cycle at 4-hour intervals. The defrost cycle is timed to last
for a total of 24 minutes unless the temperature at “P2”
reaches 60°F (15.5°C) prior to the end of the timed cycle.
Should that occur, the temperature at “P2” will override and
end the defrost cycle. During the defrost cycle, the control
will display the letters “dE” or “dF” along with the melting
snowflake icon.
Possible Displayed Alarm Codes:
“P1” – Air Probe failure: The control will override the “P1”
functions and cycle the compressor at timed intervals, until
the probe fault can be corrected.
“P2” – Evaporator Probe failure: The control will override
the “P2” function and operate with a timed defrost cycle,
until the probe fault can be corrected.
“HA” – Maximum Temperature Alarm: The cabinet air
temperature has exceeded the programmed temperature for a
period exceeding 15 minutes. The alarm will continue to
display until the cabinet temperature drops below the
maximum level.
“LA” – Minimum Temperature Alarm: The cabinet air
temperature has dropped below the programmed minimum
for a period exceeding 15 minutes. This alarm will continue
to display until the cabinet temperature rises above the
minimum level.
Note: Should a “P1” or “P2” alarm occur, check the probe
wire connections to the control prior to replacing the probe
wire.
For more detailed information regarding Electronic Control
programming and instructions, please contact:
Leer, Inc. Merchandiser Division Customer Service.
800-766-5337 https://www.leerinc.com
Loading Ice:
The merchandiser should be pre-chilled to operating
temperatures prior to loading with ice. Pre-chilling will aid
the merchandiser in reaching storage temperature at a faster
rate once loaded and reduce the risk of melting product. Do
not over fill the merchandiser with ice!
Routine calibration is recommended monthly before
reloading Ice. Follow steps from page 5 under “Calibrate
Scale.”
Auto-Defrost: Avoid stacking ice above the top edge of the
air ducts that are installed on the walls of the cabinet
interior. Blocking off these air ducts may restrict the even
distribution of air throughout the cabinet which may result
in warm spots developing within the cabinet. Do not stack
ice high enough to block off the evaporator fans in the
evaporator assembly. The evaporator fans are intended to
pull warm air entering the cabinet into the evaporator
assembly and then push that warm air across the surface of
the evaporator coil. This process removes the heat prior to
distributing the air into the cabinet.
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