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3.9 Safety devices
3.9.1 High pressure switch
The high pressure switch stops the unit when the condensing pressure is higher than the set value. The restart is manual (you need to press the button on
the pressure switch) and it can be carried out only when the pressure is under the value indicated by the differential set.
3.9.2 Defrost thermostat
It's a device which signals to the electronic control, the necessity to make the defrost cycle. Once the defrost cycle is activated, the defrost thermostat
determines also its conclusion.
3.9.3 Safety thermostat
It's a device which signals to the electronic control that the limits have been exceeded (pre-post coil inlet water temperature). In this situation the compres-
sor is disabled while the fan keeps on working. When the standard conditions are reset, the compressor starts its working again. This function is active
only in winter.
3.9.4 Defrost
The frost on the coil, obstructs the air flow, reduces the available exchange area, consequently the unit performances and can seriously damage the sy-
stem. All the units are supplied, standard, with a control which defrost automatically the heat exchanger if necessary. This control provides a temperature
probe (defrost thermostat) on the unit evaporator. When the defrost cycle is required, the microprocessor control (according to set parameters) starts
working (the yellow led turns on) according to these modalities:
- air defrost: the compressor is switched off while the fan keeps on working.
For both modalities, at the end of the defrost cycle, there is the dripping time.
For the model GH50-50W, the defrost is cyclical (the microprocessor makes the defrost cyle every 30 minutes), for the GH100-200, both air cooled and
water cooled, the defrost cycle is made in relation to the defrost panel.
3.10 Electric data
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4. INSTALLATION
4.1 General safety guidelines and and use of symbols
Before undertaking any task the operator must be fully trained in the operation of the machines to be used and their controls.
They must also have read and be fully conversant with all operating instructions.
All maintenance must be performed by TRAINED personnel and be in accordance with all national and local regulations.
The installation and maintenance of the unit must comply with the local regulations in force at the time of the installation.
Avoid contact and do not insert any objects into moving parts.
Electric data
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230/1/50
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