Siemens RVA63.242 User Manual page 93

Pump operation
Operating modes of
heating circuit
Operating mode of
d.h.w. heating
Note
Siemens Building Technologies
Landis & Staefa Division
4.31.2 D.h.w. circulating pump
The pump connected serves as the d.h.w. circulating pump.
The pump's time schedule for operation can be selected either according to the "D.h.w.
program" or according to "Time switch program 2".
The setting for this function must be made on line 122. Also refer to "switching program
selection circulating pump" in Index.
4.31.3 Electric immersion heater for d.h.w.
The connected electric immersion heater is used to heat the d.h.w. during the summer
months (automatic summer / winter changeover).
When both heating circuits change to summer operation (THG1 and THG2), automatic
changeover to d.h.w. heating will then take place, provided d.h.w. heating has been
switched on with the operating mode button.
Since the function depends on automatic summer / winter
changeover, changeover to d.h.w. heating with the electric
immersion heater takes place only in heating circuit operating mode
"Automatic operation" and in "Stand-by".
In heating circuit operating mode "Continuous operation", the boiler
continues to deliver the amount of heat required. Hence, this
operating mode may not be selected for the summer if the d.h.w.
shall be heated with the electric immersion heater.
Switching on / off with the d.h.w. operating mode button remains
fully active. Hence, for the d.h.w. to be heated during that period of
time, the operating mode button for d.h.w. must be pressed.
To ensure a smooth transition of d.h.w. heating when changing to summer operation,
the boiler charges the d.h.w. storage tank until 24.00 hrs on the day of change to avoid
potential interruptions caused by utility locking periods.
Basic Documentation RVA63.242, RVA53.242
Description of heating engineer settings
93/218
CE1P2373E
26.03.2001