Rev. B 08-2017
20
V/~/Hz
230/1/50
V/~/Hz
24/1/ 50
V/~/Hz
230/1/50
V/~/Hz
230/1/50
MTEC.4680.GB-B-1 Operation and maintenance manual GH serie English
GH
Dehumidifiers for radiant cooling system
3.10 Safety devices
3.11 Electric data
3.10.1 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.
3.10.2 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.
3.10.3 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 situa-
tion the compressor 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.
3.10.4 Defrost
The frost on the coil, obstructs the air flow, reduces the available exchange area and consequently the unit performances and can seriously
damage the system. 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), switches the compressor off, while the fan remains in operation. At the end of the defrost cycle, it is
waited for the dripping time to allow the complete cleaning of the coil, this process is carried out in cyclical mode.
Electric data
Power supply
Control circuit
Auxiliary circuit
Fans power supply
4. INSTALLATION
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 regu-
lations.
The installation and maintenance of the unit must comply with the local regulations in force at the time of the installa-
tion.
Avoid contact and do not insert any objects into moving parts.
4.1 General safety guidelines and and use of symbols
