45/218
Siemens Building Technologies Basic Documentation RVA63.242, RVA53.242 CE1P2373E
Landis & Staefa Division Description of end-user settings 26.03.2001
3.5 Manual operation
Manual heating operation in case the control system fails.
Manual operation is an operating mode in which all required plant components must be
manually adjusted and monitored. The controller's control functions have no more
impact on the relays.
The required boiler temperature setpoint must be manually adjusted on the boiler's
control thermostat. The boiler temperature is displayed on setting line 56.
The temperature of the heating circuits can be adjusted with the mixing valve, which
must also be set to manual operation. The room temperature is still displayed on setting
line 33.
Activation: Manual operation is activated by pressing this button. It is accessible
only when the cover of the controller is open
Deactivation: • By pressing one of the operating mode buttons
• By pressing again the manual operation button
When deactivating the function, the controller will automatically return to the operating
mode previously selected.
As soon as manual operation is activated, the following values are used for the heat
demand:
For space heating:
Maximum limitation of flow temperature setpoint (lines 107 and 108).
For the d.h.w.:
Nominal setpoint of d.h.w. temperature (line 26) + setpoint boost of d.h.w. flow
temperature (line 126).
For the minimum flow temperature setpoint and heat demand DC 0…10 V:
Minimum setpoint of the flow temperature, contact H (line 171).
The outputs will be switched to the following states:
Output Terminals State
Burner stages 1 and 2 K4, K5 ON
Heating circuit pump Q2 ON
D.h.w. charging pump
D.h.w. diverting valve
Q3
Y3
ON
OFF
Mixing valve outputs Y1 / Y2 OFF (de-energized)
1)
Multi-functional output K6 / K7 2 = ON
2)
1)
With maintained return temperature with the mixing valve, Y1 will be controlled for a period of time that
equals 5 times the set valve running time. Then, Y1 is de-energized.
2)
Except with the settings of the multifunctional outputs solar, alarm output and modulating burner (only K7).
In these cases, K6/K7 are OFF.
The following functions are no longer active in manual operation:
maximum limitation of the boiler temperature:
Maintained return temperature with mixing valve
To Next Page
Loading...
