Circulating Pump; Hx Pumps; Overview - Siemens RVS41.813 User Manual

Circulating pump

Circulating pump release
Circulating pump cycling
Circulation setpoint

Overview

Siemens Switzerland Ltd
HVAC Products
Line no. Operating line
1660 Circulating pump release
Time program 3 / HCP
DHW release
Time program 4 / DHW
1661 Circulating pump cycling
1663 Circulation setpoint
When using setting "Release DHW", the circulating pump runs when DHW heating is
released.
When the function is activated, the circulating pump is switched on for a fixed time of 10
minutes within the release time and then switched off again for 20 minutes.
The circulating pump is defined via the relevant setting of a relay output 1 - 4 (5891 -
5894).
The circulation pump Q4 switches on as soon as the set value is breach if sensor B39
is located in the DHW distribution pipe. The pump then operates fixed for 10 minutes or
more until the setpoint is once again achieved. A set difference of 8 K always exists
between the setpoint for the DHW storage tank and the setpoint for sensor B39 (Par
1663). This ensures that the circulation setpoint can be achieved again and keeps the
circulation pump from running continuously.
Example 1: - DHW setpoint: 55°C (nominal setpoint)
- Circulation setpoint: 45°C
The circulation pump switches on when the sensor actual value drops
below 45°C and runs for at least 10 min
Example 2: - DHW setpoint: 50°C
- Circulation setpoint: 45°C
Circulation pump switches on if the sensor actual value drops below 42°C
(50°C - 8K) and operates for at least 10 min
6.9

Hx pumps

Prerequisite for using the Hx pumps is an appropriately defined Hx
input (5950, 5960 or 6046). The input must be defined as heat
request, heat request 10 V, release swimming pool, refrigeration
Q15/18/19
request, or refrigeration request 10 V.
The Hx pumps (Q15 / Q18 / Q19) are put into operation when there
is a heat or refrigeration request at the respective input, or when
excess heat draw is called for.
The pumps are to be connected to the appropriately defined
multifunctional relay outputs Qx.. (6030 - 6032).
User manual RVS61.843, RVS41.813
6 The settings in detail
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CE1U2355en_02
28. September 2009