18
Boiler working stages, temperatures
3.3. TEMPERATURES
- Boiler temperature
- set the boiler temperature
(setting range: 75°C - 90°C)
- Boiler difference
- set the boiler difference
(setting range: 5°C - 20°C)
- DHW temperature
- set the DHW temperature
(setting range: 20°C - 85°C)
- DHW difference
- set the DHW difference
(setting range: 3°C - 40°C)
- set the flue gas temperature for boiler shutdown
- Flue gas temperature OFF
(setting range: 70°C - 160°C)
factory setting: 25 kW:
°C; 35 kW:
°C, 45 kW:
°C
105
100
100
- this condition is met if option is enabled and when measured flue gas temperature in D-2 stages is lower
than set flue gas temperature constantly for 900 sec
- Flue gas temperature GLW
-
OFF
- set the flue gas temperature for boiler shutdown when GLOW mode is
enabled (setting range: 80°C - 180°C)
factory setting: 25 kW:
°C; 35 kW:
°C, 45 kW:
°C
140
105
105
- this condition is met if option is enabled and when measured flue gas temperature in D-2 stages is lower
than set flue gas temperature constantly for 900 sec
IMPORTAN NOTE:
FACTORY SETTINGS (FLUE GAS TEMP. OFF AND FLUE GAS TEMP. GLW-OFF) ARE ONLY AS REFERENCE,
ACTUAL SETTING MUST BE ADJUSTED BY USER ACCORDING TOTHE FUEL USED AND BOILER FLUE
GAS PASSAGES CONDITION (HOW CLEAN/DIRTY BOILER IS)
3.2.3. BOILER COOLING CONDITION
Condition for
BOILER COOLING
activation:
- if boiler temperature reaches 92°C, pump P1 is started and 3-way mixing valve is open to 100% (regardless of the
demand) to cool down the boiler.
3.2.2 PUMP P2 CONDITION
Conditions for
PUMP P2
(DWH):
- pump P2 is working when accumulation tank temperature (upper sensor) is for 5°C higher than DHW temperature.
3.2.1. PUMP P1 CONDITION
Conditions for
PUMP P1
for return flow protection with
3-way mixing valve, actuator and return flow sensor:
- boiler is working
(flue gas fan is working): P1 works when boiler temperature is above 65°C.
- boiler is not working
(flue gas fan is not working): P1 works when boiler temperature is for 3°C higher than
temperature in the accumulation tank (upper sensor).
Conditions for
PUMP P1
for return flow protection with
3-way thermostatic valve (60°C), with or without return flow
sensor:
- boiler is working
(flue gas fan is working): P1 works when boiler temperature is above 65°C.
- boiler is not working
(flue gas fan is not working): P1 works when boiler temperature above 65°C and boiler
temperature is for 3°C higher than temperature in the accumulation tank (upper sensor).
3.2. VARIOUS BOILER CONDITIONS
Technical instructions REGULATION
BioTec-C