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Siemens Building Technologies Basic Dokumentation RVA63.280, RVA53.280 CE1P2374E
Landis & Staefa Division 19.04.2001
1.6 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 (line 107)
• 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 flow temperature, contact H (line 171)
The outputs will be switched to the following states:
Output Terminals Status
Burner stages 1 and 2 K4, K5 ON
Heating circuit pump Q2, Q6 ON
D.h.w. charging pump
D.h.w. diverting valve
Q3
Y3
ON
OFF
Mixing valve outputs Y1 / Y2, Y5 / Y6 OFF (de-energized)
The following functions are no longer active in manual operation:
maximum limitation of boiler temperature:
2374Z12
Benefit
Description
Boiler temperature
Room temperature
Setting
Note
Effect
Note
Display
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