Circulation Pump Command

This macro generates the circulation pump command at the output "CircPumpCmd".

For a complete pump operation with alarming and exercise, you must add one of the pump or twin pump macros.

If the parameter SEP-03 = 1, the circulation pump will run automatically during occupied periods, extended operation or if the “CircPumpDemand” requests a water circulation.  

If SEP-03 = 0, you can start the circulation pump using the input "CircPumpDemand" in one of the following ways:

When the input “CircPumpDemand” detects a DHW demand, it starts a circulation pump command. Even if the demand persists only for a short time, the circulation pump will continue to run for the time of an adjustable delay defined by the parameter SEP-02. This function helps to save water and electric energy.

Example:

Assume that you have circulation pipes and you want to avoid waste of heat and electric energy. In this case, you open the hot water tap for a brief period. The circulation pump starts. Now you wait for a minute and open the tap again. The water in the whole circulation pipe is now at the right temperature and you do not waste cold water.

The circulation pump runs during overheat protection (“OverheatProt” = 1) and if “MaxThermostat”= 1, depending on the parameter SEP-04.

The circulation pump does not run or stops, if the "HolidaySwitch" is in the holiday position.

But the circulation pump will always run always during legionella protection even if it occurs during un-occupied periods or holidays.

IMPORTANT!

For buildings, where the Drinking Water Guidelines apply, it is not allowed to stop the circulation pump for more than 8 hours during a day. In this case we recommend connecting a binary input point which is assigned to a time schedule, to the input "CircPumpDemand".

For all configurations the circulation pump will be switched off after the switch off delay defined by parameter SEP-02.

Table 8.   Parameter List

Description

Range

Default

Units

PRP-01: start-up delay primary/ secondary pump

0...600

120

sec

SEP-02: circulation pump switch off delay

0…3600

900

sec

SEP-03: run circulation pump during occupied periods and extended operation

0 /1

1

-

SEP-04: circulation pump during overheat protection

0; 1 = disable

2 = enabled if “MaxThermostat” = 1

3 = enabled if “OverheatProt” = 1

4 = enabled if “MaxThermostat” = 1 or if “OverheatProt” = 1

0/ 1

1

-