6720892984 (2019/02) US
SSB
32 | Main control
Relevant variables
Specific Parameters
Level
(Default) Value
Settable
°C
°F
°C
°F
DHW_Mode
2: Installer
0
0, 1, 2, 3, 5, 6, 7, 8
DHW_Store_Setpoint
Sets the desired DHW temperature.
[°C/°F] 1: User
57
135
40..71
104..160
DHW_Store_Hyst_Down
Hysterese to detect store demand. Condition: T_Store below DHW_Store_
Setpoint less DHW_Store_Hyst_Down.
[°C/°F] 3. Factory
5
9
0..20
0..36
DHW_Store_Hyst_Up
Hysterese to end store demand. Condition: T_Store above DHW_Store_
Se DHW_Store_Hyst_Up.
[°C/°F] 3. Factory
5
9
0..20
0..36
DHW_Store_Supply_Extra
Increases the supply temperature to the store until DHW_Store_Se
DHW_Store_Supply_Extra.
[°C/°F] 2: Installer
15
27
0..30
0..54
DHW_Priority
[-]
2
0
¨
Time
1
¨
Off
2
¨
On
3
¨
Parallel
DHW_Supp_Hyst_Down
Hysterese to start burner for DHW. Condition: T_Supply below DHW_
Supply_Setpoint less DHW_Supp_Hyst_Down.
[°C/°F] 3. Factory
5
9
0..20
0..36
DHW_Supp_Hyst_Up
Hysterese to stop burner for DHW. Condition: T_Supply above DHW_
Supply_Setpoint plus DHW_Supp_Hyst_Up.
[°C/°F] 3. Factory
5
9
0..20
0..36
DHW_Store_Hold_Warm
If T_Store drops below DHW_Store_Setpoint the store warm hold function
becomes active.
[°C/°F] 3. Factory
5
9
0..10
0..18
Status variables
Level
Value/Range
°C
°F
DHW control state
Central heating controller state
0
¨
Idle
1
¨
Request
2
¨
Demand
3
¨
Post circulation
4
¨
Off
5 .2 .2 .3 DHW mode 2 – Storage with thermostat
In this Mode DHW is prepared by warming up a indirect tank. Either a DHW pump or 3-way valve can used to switch to DHW mode. The temperature of
the DHW in the indirect tank is regulated by a thermostat (instead of a sensor), which should provide only an open/closed signal to the control.
When the thermostat closes the control detects a demand for the tank and starts the DHW pump.
If the supply temperature
T_Supply
drops below
DHW_Store_Setpoint
+
DHW_Store_Supply_Extra
–
DHW_Supp_Hyst_Down
the burner
starts.
When the burner is ON the power is PID-controlled based on
T_Supply
toward
DHW_Store_Setpoint
+
DHW_Store_Supply_Extra
.
The burner is stopped when the supply temperature rises above
DHW_Store_Setpoint
+
DHW_Store_Supply_Extra
+
DHW_Supp_Hyst_Up
.
The demand for the DHW is ended when the store thermostat opens. The pump continues
DHW_Post_Pump_Period
after the DHW demand
stopped.
DHW priority
See paragraph “5.2.2.2 DHW mode 1 – Storage with sensor” pag. 31
Содержание SSB1000 SA
Страница 82: ...6720892984 2019 02 US SSB ...
Страница 83: ...SSB 6720892984 2019 02 US ...