Breaking capacity for each thermostat
- 15 A (2.5 A) at 250 V
- 10 A (2.5 A) at 400 V
•Only qualified personnel may carry out work on the thermostat.
•When replacing an old thermostat with a new model, remember to carry out the wiring
modifications and run an operating test.
VENTILATION UNITS
1. Fresh air only operation
If the temperature at the chamber outlet is lower than 25°C, the combustion chamber ventilation unit is 90% closed.
If the temperature at the chamber outlet is greater than 25°C, the combustion chamber ventilation unit is open.
The ventilation unit can be controlled by an On/Off servomotor without a zero return (zero return by phase inversion). This
servomotor may be controlled by the thermostat's 1st stage (to fine-tune the air outlet temperature setting, the servomotor may
be the modulating type controlled by a modulating regulator with a supply air sensor).
The servomotor will have a mechanical stop to allow the opening and closing percentages to be set (travel limit).
2. Adjusting the bypass flap
To obtain the ideal temperature at the combustion chamber outlet and reduce the risk of condensation, please set the
combustion chamber bypass according to the exhaust temperature (min. 160°C in the worst-case scenario).
Note: the settings are given for information only; they must be fine-tuned during operation at a low return temperature. A larger
bypass opening improves operation.
GENERATOR
For safety and maintenance reasons, please observe the clearances given below.
Access side
La distance between the GGS generator and the wall must be at least 900 mm (the desired distance is the depth of the GGS
generator).
Opposite side
The distance between the GGS and the wall must be determined on the basis of how the burnt gas duct is installed (see section
relating to its installation).
The unit must be installed in accordance with current regulations and standards in a well-ventilated area.
The unit must not be installed in an area with a risk of fire (fine flammable dust) or explosion, or in an area
containing aggressive products such as trichloroethylene, perchlorate, etc.
The fresh air flow required to supply combustion is at least 2 m3/h per kW of heat flow.
GAS PIPE AND ELECTRICAL ROUTING
Inside the GGS generator
•Observe the correct clearance for the smoke box access panel.
•Allow room to access the minimum gas pressure switch (adjustment).
SELECTING THE BUFFER CAPACITY
The volume of the buffer tank + the volume of the pipework (expansion valve at the consumption point) must be based on the
maximum flow of the installation, at least: BP (16 to 21 mbar) 2 litres per Nm3
MP (0.06 to 4 bar) 1 litre per Nm3
NOTE: the buffer capacity does not compensate for undersized pipework.
Required buffer capacity in litres based on the max. flow in Nm3/h
Gas flow rate Nm
/h 6 10 16 25 40 65 100 160 250 400 650 1000
Buffer volume LP pressure 12 20 32 50 80 130 200 320 500 800 1300 2000
Buffer volume MP pressure 6 10 16 25 40 65 100 160 250 400 650 1000
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