E/1203/30A/29
12. Control, Monitoring and Safety Components
All equipment is set and inspected at the factory and generally does not require further adjustments
or interventions.
If, for specific reasons, it becomes necessary to perform modifications on the settings of automatic
devices this task must only be performed, subsequent to notification to the STULZ engineering
service, by specialized product expert.
STULZ air conditioner are equipped with a set of devices designed to ensure proper operation.
Intervention by any one of these automatic safety devices is a sign of a malfunction and it is
absolutely necessary to eliminate the cause of the malfunction.
WARNING!
It is prohibited to make electrical by-passes on safety equipment.
This intervention, in addition to being dangerous, also immediately invalidates guarantee
coverage for the product.
Interrupt electrical power to the unit before performing any repair or maintenance.
Work on the unit must only be done by expert, qualified and authorized personnel.
12.1 HIGH PRESSURE SAFETY SWITCH
stops compressor operation when the pressure inside the refrigeration circuit exceeds the design
values.
12.2 LOW PRESSURE SAFETY SWITCH
stops compressor operation when the pressure inside the refrigeration circuit drops below the
design values.
12.3 CONDENSATION CONTROL PRESSURE SWITCH (fan speed control )
It controls the condenser fan speed to keep the condensing temperature constant.
Changes of fan speed are obtained by changing the supply voltage depending on the condenser
temperature.
12.4 CONTACTORS
control the motors by operating with auxiliary voltage.
They refer to IEC947-4-1 standards.
12.5 TRANSFORMER
refers to EN60742 standard and transforms the supply voltage to the auxiliary control voltage.
12.6 REGULATING THERMOSTAT
The mechanical thermostat with a gas charge is positioned at the evaporator air intake and it
measures and controls the temperature to provide the start signal for the compressor. It can be
adjusted within the allowed temperature range of the technical data sheet.
12.7 HEATING ELEMENT THERMOSTAT (supplied with the reheat option, only for CVC14/20/28/41)
The mechanical thermostat with a gas charge is positioned at the evaporator air intake and it
measures and controls the temperature to provide the start signal for the heating element.
Summary of Contents for CVC 07 001yy
Page 2: ...E 1203 30A 2...
