20
9.
HYDRAULIC SCHEMES
9.1
SCHEME 1
Pic. 15
Scheme with 4 way steering valve controlling central heating circuit
2
,
where: 1 – boiler, 2 –
burner, 3 – controller, 4 – boiler temperature sensor, CT4, 5 – fumes temperature sensor, 6 – servomotor of
4 way valve, 7 – mixer cycle pump, 8 – mixer cycle temperature sensor, 9 – silo of hot water, 10 – hot
water pump, 11 – hot water sensor, 12 – weather temperature sensor CT4-P, 13 – room panel ecoSTER200
or standard room thermostat, 14 – return temperature sensor.
To improve water circulation in gravity cycle it is necessary to use large nominal profiles
DN of a pipe and 4 way valve, not to use large amount of knees and profile narrowings.
Use other rules referring to gravity installations. If return sensor is installed closely, it is
necessary to isolate it thermically from surroundings and improve thermal contact with
pipe. Preset silo temperature must be set so high to ensure thermal power for mixer cycle
when at the same time heating water returning to the silo.
RECOMMENDED SETTINGS:
Parameter
Setting
MENU
Preset boiler temperature
75-80
C
menu
boiler settings
Min. preset boiler temperature
65
C
menu
service settings
boiler settings
Increase preset boiler temperature
5-20
C
menu
service settings
CH and HUW settings
Mixer handling 1
CH activated
menu
service settings
mixer 1 settings
Max. Preset mixer temperature 1
70
menu
service settings
mixer 1 settings
Mixer heating curve 1
0.8 – 1.4
menu
mixer 1 setting
Mixer Weather control 1
activated
menu
mixer 1 setting
Selection of mixer thermostat 1
ecoSTER T1
menu
service settings
mixer 1 settings
2
Shown hydraulic scheme does not replace the project of central heating and serves only as a sample!