CMS200 Product Manual, Issue 6
www.nexo.com Page 17
2.1.3 Evaporator sensor
The evaporator sensor measures the temperature of the evaporator. CMS200 controllers can use the
temperature of the evaporator to activate and terminate defrost cycles.
The evaporator sensor should be placed in the
immediate proximity of the evaporator.
Mount the sensor head inside the evaporator cooling
ns, as shown. The sensor head must be mounted
securely to prevent being dislodged due to vibration.
For coolers tted with a defrost heater, the evaporator
sensor should be placed as far away as possible from
the heating element, for example at the opposite end of
the evaporator.
If the evaporator sensor measures the localized heating
from the heating element, defrost cycles will terminate
before the whole evaporator has had the opportunity to
defrost.
Note
Do not use cable ties. The head of the sensor is fragile and can be easily damaged. Using
cable ties to secure the sensor head, or sensor cable, invalidates the warranty.
2.2 Door switch
Door switches are used to detect door openings. They are SELV (safety extra low voltage) components that
are able to create an open and closed circuit. The Elstat enhanced door switch, and activator, are over-
moulded for increased physical protection and resistance to water ingress.
Door switch cables are available with various cable lengths.
Door switches must be used with
the corresponding activator.
Door switches are usually mounted with the door switch on the cooler and the activator on the door. Both
components must be xed using counter sunk screws or bolts with the following characteristics:
` Head: countersunk, maximum diameter 5.0mm (0.24in)
Thread: maximum diameter 3.0mm (0.16in)
` The screws must be tightened to a maximum torque of 0.5Nm (0.37lb ft)
Note
If using non-Elstat door switches, ensure that they are double insulated.
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