On initial start-up or after power failure, the pump will be enabled after a delay defined by parameter PRP-01.
The pump starts if one or more of the following conditions are true:
The calculated DHW setpoint condition includes normal, extended and legionella operation. Stopping the pump will always occur after a delay defined by parameter PRP-02.
Programming Hint
Connect a flow switch only for continuous-flow or tankless heater applications. For applications with single domestic hot water heat exchanger connected to a DHW tank, set the "CircPumpDemand" input to the value "1"
Start-up Hint
Take care that the primary pump always starts earlier than the secondary pump. The primary pump start-up delay must be shorter than the secondary pump start-up delay in order to assure that the heat is not accumulated in the heat exchanger.
The secondary pump must stop later than the primary pump.
Table 9. Parameter List
Description |
Value Range |
Default Value |
Unit |
PRP-01: primary pump start-up delay |
0...600 |
0 |
sec |
PRP-02: primary pump switch off delay |
0...1200 |
5 |
sec |