Type Of D.h.w. Demand - Siemens RVA63.280 Basic Documentation

Benefit
Description
Note
Setting
Effect
Important
Difference
Note
Important when using a
d.h.w. control thermostat
Siemens Building Technologies
Landis & Staefa Division
2.40

Type of d.h.w. demand

Use of different d.h.w. heating modes.
Use of d.h.w. storage tanks with control thermostats.
Defines the type of d.h.w. control (via d.h.w. sensor or control thermostat).
Setting of this function has an impact on the automatic generation of the type of plant
(also refer to "plant types" in index.
Setting range
0 / 1
By making this setting, the controller takes into account the signal fed to it by the d.h.w.
sensor conected to terminal B3.
Entry:
0 Sensor: The temperature measured with the sensor is used for the control of the
d.h.w. temperature
1 Control thermostat: The switching status of the control thermostat connected to
terminal B3 is used for the control of the d.h.w. temperature
The contacts of the control thermostat must be suited for extra low voltage (gold-
plated)!
• When using a d.h.w. temperature sensor:
The controller calculates the switching points with the respective switching differential
as a function of the d.h.w. temperature setpoint entered.
Sensor / line with a short-circuit
Measuring signal present
Sensor / line with a short-circuit
• When using a d.h.w. control thermostat:
The controller takes into consideration the switching statuses of the control
thermostat.
Contact closed
Contact open
Contact resistance too high
When using a d.h.w. control thermostat, reduced operation is not possible. This means
that when reduced operation according to the d.h.w. program (line 121) is active, d.h.w.
heating with the thermostat will be locked.
• The nominal d.h.w. temperature setpoint must be equal to or higher than the
setpoint adjusted on the control thermostat (thermostat is calibrated at the switch-off
point).
• The boost of the flow temperature setpoint of d.h.w. must be a minimum of 10 °C
(has an impact on the charging time).
• In that case, frost protection for d.h.w. is not ensured
Basic Dokumentation RVA63.280, RVA53.280
Unit
Increment
= fault status signal
= d.h.w. according to setpoint
= no d.h.w.
= d.h.w. heating ON
= d.h.w. heating OFF
= fault status signal from thermostat
Factory setting
0
105/184
CE1P2374E
19.04.2001