4
I
CUBE™ Adaptive Defrost Module
6. Connect the thermistor probe to the evaporator coil.
There are two options for probe placement.
Note:
Ensure the copper tube surface area designated
for thermistor probe placement is clean. Use Emery
cloth or Evaporator cleaner to clear the surface. A
dirty surface could create an insulation barrier which
may cause inaccurate temperature readings.
–
Insert the probe between the cooling fins, as shown
in FIG. 8. Ensure that the probe makes good contact
with one of the evaporator tubes. Then, using needle
nose pliers, carefully bend the cooling fins together
to hold the probe firmly in place.
–
Use the provided clip, or if the clip is the incorrect
size, use another means to fasten the thermistor
probe to one of the circuit tubes e.g., hose clamp,
insulation tape, zip tie, as shown in FIG. 9. Clip the
probe onto one of the lower coils in either the
10 o'clock or 2 o'clock position, making sure that
the probe makes good contact with the evaporator
tube.
Recommended Thermistor Probe Position
The probe should be positioned and fastened wherever
frost accumulates most quickly. This is generally 1" to 2"
(2.5 cm to 5 cm) from either end, at the bottom quarter
and at the discharge side of the evaporator coil. If there
is uncertainty about where frost typically accumulates
the fastest, put the system into a manual defrost (see
"Optional: Manual Defrost" on page 6) and monitor
the last area of the evaporator where frost is present
prior to a completely frost-free coil.
Make sure the probe is not fastened in close proximity
to the electric defrost heating element.
7. Route the thermistor probe wires away from the
evaporator fans and cooling fins, avoiding pinches
and strain. Route the wire through existing or new line
voltage conduits. Secure the wires as appropriate for
your installation.
8. Use the provided wire connectors to connect the
thermistor probe wire to the routed 18–14 AWG field-
supplied wire.
9. Use electrical tape to protect all connections against
moisture.
10. If additional thermistor probes are needed repeat all
steps in this section. For large evaporators, additional
thermistor probes may be added to a coil on each
(opposite) side.
11. For multiple-evaporator installations, see "Optional:
Multiple Evaporators" on page 6.
Probe
Cooling Fins
FIG. 8
Insert Thermistor Probe between Evaporator Cooling Fins
Evaporator Coil
Clip
FIG. 9
Connect Thermistor Probe to Evaporator Coil
