[8]
Probe “P2” is inserted into the finned section of the
evaporator coil, near the top of the unit cooler
assembly. This probe monitors the temperature of
the evaporator coil during the defrost cycle. The
control is factory programmed to engage the defrost
cycle in 4 hour intervals. The defrost cycle is set to
run for 16 minutes, unless the temperature at “P2”
reaches 50 degrees F prior to the end of the 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” 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 5 minute
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 programmed maximums for a
period exceeding 15 minutes. The alarm will continue to
display until the cabinet temperature drops below
maximum levels.
“
LA
” – Minimum temperature alarm: The cabinet air
temperature has dropped below the programmed
minimum. 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 the
electronic control programming and instructions,
please contact: Leer Merchandiser Customer
Service Department. Phone: 800-766-5337. Contact
information is available on our web-site at
http://www.leerinc.com/ice-
merchandisers/merchandiser-sales-distributors/
The defrost circuit is equipped with a defrost
termination switch. This switch is attached to one of
the evaporator coil tubes (located inside the unit
cooler assembly). This switch senses temperature
and will cycle power off to the defrost heat element
should the temperature at the surface of the switch
reach 70 degrees F. This switch only terminates
power to the heat element and will not end the
timed defrost cycle. Once the Vending Machine has
returned to run mode, the termination switch will
re-set when the temperature at its’ surface reaches
35 degrees F.
Maintenance
General:
The recommended preventive maintenance intervals
will often vary depending upon the environment in
which the Vending Machine operates. A preventive
maintenance plan should be developed to aid in
determining realistic cleaning intervals.
Cleaning Condenser Coils:
It is recommended to inspect and clean the
condenser coil and fan blades every 3 month.
There are a variety of methods available for
cleaning the condenser coils. Keep in mind that the
debris is being drawn into the coil by the condenser
fan and the debris should be removed in the
opposite direction.
The simplest and preferred method would
involve the use of a vacuum cleaner to suck the
debris out of the coil from the outside surface.
Another method is using compressed air to blow
dust from the coil. The debris should be blown
out from the inside surface of the coil.
Note: Maintenance and repair of the electrical and
refrigeration systems should only be performed by
trained and qualified personnel.
The defrost termination switch functions as a
possible fire protection device. Do not remove or
by-pass the termination switch from the defrost
circuit.
WARNING!
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