68
12.7 Control functions
Dependent on the required functions of the appliance and connected sensors and components, several operation
modes for Central Heating (CH) and Domestic Hot Water (DHW) can be selected.
12.7.1 R
OOM THERMOSTAT ONLY
;
CH
MODE
0
(D
EFAULT SETTING
)
For this mode the CH mode should be set to 0 and no outdoor sensor is needed.
If the room thermostat closes, the boiler and system pumps are switched ON. When the supply temperature drops
CH_Hysterese_Down below the CH_Setpoint (settable via the menu) the boiler is switched ON. The power for the
boiler is PID regulated between T_Supply and the CH_Setpoint using the PID parameters for Central Heating.
If the supply temperature reaches a temperature CH_Hysterese_Up above the CH_Setpoint the boiler is switched
OFF. However, if CH_Se CH_Hysterese_Up is greater than maximum setpoint the boiler switches OFF at
the maximum setpoint.
If the room thermostat opens the boiler is switched OFF (if this was not already happening) and the boiler and
system pumps run ON for CH_Post_Pump_Time.
Anti-cycling time
(This function is also applicable to all other CH modes) When the boiler is switched OFF because the supply
temperature reaches CH_Se CH_Hysterese_Up, the control will wait a period of time (Anti_Cycle_Period
→180 sec. settable) before it is allowed to be switched ON again.
This function is to prevent short cycling ON and OFF of the boiler. However, when during the anti-cycle wait time
the differential between setpoint and supply temperature gets greater than Anti_Cycle_T_Diff, anti-cycle will be
aborted, and the boiler is allowed to start.
Maximum CH power
(This function is also applicable to all other CH modes)
The maximum boiler power during CH operation can be limited with parameter P_CH_Max.
Minimum CH power
(This function is also applicable to all other CH and DHW modes)
The minimum boiler power during operation can be limited with parameter P_CH_Min.
Adjustable Set Point Heating Parameters
Specific Parameters
Level
Default
Value
Range
CH_Mode
2: Installer
1
Mode 0-5
CH Setpoint
Sets the required supply temperature.
2: Installer
85 ºC
(185 ºF)
20…..90 ºC
(68…..194 ºF)
CH_Post_Pump_Time
2: Installer
120 sec.
10…..900 sec
Anti_Cycle_Period
2: Installer
180 sec
10…..900 sec
Anti_Cycle_T_Diff
Aborts anti-cycle time when setpoint –
actual supply temp >
Anti_Cycle_T_Diff.
2: Installer
16 ºC (29 ºF) 0…..20 ºC (0…..36 ºF)
P_CH_Max
Maximum boiler power for CH operation
2: Installer
100 %
1…..100 %
P_CH_Min
Minimum boiler power for CH operation
2: Installer
1 %
1…..50 %
Summary of Contents for S-CBX 105
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Page 40: ...40 9 10 Flue Terminal Positioning ...
Page 42: ...42 9 11 1 FIGURE 12 LINE G ...
Page 55: ...55 11 5 Ladder Logic Diagram ...
Page 56: ...56 11 6 Electrical schematics ...
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