15
With CTFS and CTN models, available DHW litres per minute depend on boiler heat output and water mains supply temperature, according to the
following formula:
l = DHW litres per min. = --------
where K is:
- 336 for CTN 24 model
- 405 for CTN 28 model
- 348 for CTFS 24 model
- 426 for CTFS 28 model
- 453 for CTFS 32 model
ΔT = hot water temperature – cold water temperature
For instance, with model CTFS 24, if the cold water is at 8°C and you want hot water at 38°C for a shower, the value of ΔT is:
ΔT = 38°C - 8°C = 30°C
and the number of DHW litres per minute available at 38°C is:
348
l = ------ = 11.6 [litres per minute] (water mixed at cock)
30
"/5*'3&&;&GVODUJPO
This boiler is fitted with an anti-freeze protection system, which works when the following functions are activated: “OFF/SUMMER/WINTER/CH ONLY”.
5IFBOUJGSFF[FGVODUJPOPOMZQSPUFDUTUIFCPJMFSOPUUIFXIPMFIFBUJOHTZTUFN
The central heating system can be effectively protected against icing by using specific anti-freeze products that are suitable for multi-metal
systems.
%POPUVTFBOUJGSFF[FQSPEVDUTGPSDBSFOHJOFTBOEDIFDLUIFFòFDUJWFOFTTPGUIFQSPEVDUVTFEPWFSUJNF
In case burner cannot be ignited due to the lack of gas, the anti-freeze functions are anyway enabled through the circulation pumps.
'MPXBOUJGSFF[FGVODUJPO
When the heating water temperature sensor detects a water temperature of 5°C, the boiler switches on and stays on at its minimum heat output
until the temperature reaches 30°C or 15 minutes have elapsed.
The pump continues to operate even if the boiler shuts down.
1MBUF%)8BOUJGSFF[FGVODUJPO
On the CTFS / CTN models, the anti-freeze function also protects the DHW plant.
When the DHW temperature sensor detects a temperature of 5°C, the boiler switches on and stays on at its minimum heat output until the tem-
perature reaches 10°C or 15 minutes have elapsed (the deviating valve is in the DHW position).
During the DHW anti-freeze operation the temperature detected by the flow probe is constantly checked, and in case it reaches 60°C the burner is
switched off. The burner is switched on again if the operation request in anti-freeze mode is still present and the flow temperature is below 60°C.
The pump continues to operate even if the boiler shuts down.
#PJMFSBOUJGSFF[FGVODUJPO
In RTN / RTFS models featuring an external water cylinder (optional) for the production of DHW with a NTC type temperature sensor (10 kQ @
ß=3435; refer to water cylinder technical specifications) the anti-freeze function also protects the water cylinder. When water cylinder temperature
sensor detects a water temperature of 5°C, the boiler switches on and stays on at its minimum heating output until the temperature of the water
cylinder water reaches 10°C or 15 minutes have elapsed. The pump continues to operate even if the boiler shuts down.
During the boiler antifreeze operation the temperature detected by the flow probe is constantly checked, and in case it reaches 60°C the burner is
switched off. The burner is switched on again if the operation request in anti-freeze mode is still present and the flow temperature is below 60°C.
K
ΔT
Summary of Contents for FORMENTERA CTFS 32
Page 60: ...60 C D E fig 40 ...
Page 67: ...67 ...
