Rotex Controller Series, Продуктовая документация

Страница: 96 / 192

EbV Product documentation THETA NORM/UNIT
8-12
8.1.12 Primary pump (PP)
The primary pump is the functional equivalent of a CHP, with the following exceptions:
• DHW demand does not go to PP (charging pump only for heating circuits)
• The extended run time is the same as for CHP (same parameters)
• The PP must be connected to the standard unit with address 10 so that all heating circuit demands (even
for multiple controllers) are detected.
• If connected to a subsequent controller, only demands by heating circuits of the corresponding controller
are effective (see CHP).
• The PP operates in parallel mode in every DHW mode (no priority switch-off).
• The PP is only switched off if there is no demand by heating circuits.
8.1.13 Boiler circuit pump
NOTE: Function active only if the function "Boiler circuit pump" was assigned in the
"Hydraulic" menu to one of the outputs "Direct circuit pump", "Variable output 1" or
"Variable output 2".
Function: This function is used primarily in multiple boiler plants with thermohydraulic
distributors and serves as a waterside barrier for heat generators which are not in
operation. The variable output controls a boiler circuit pump with spring non-return
valve or an engine driven butterfly valve. The function is activated directly when there
is a demand for the heat generator. The heat generator is only enabled after the set
pre-run time. After the heat generator is turned off, the variable output is still active
for the period of the set extended run time.
BCP2: Two boiler circuit pumps can be connected to plants with two single boilers or a
double boiler. The second output controls the boiler circuit pump of the sequential
boiler.
BCP pre-run time: The setting of a pre-run time is only relevant if a shut-off device (e.g. motorized valve)
is used at a variable output instead of a boiler circuit pump.
By setting the pre-run time, the run time of the used shut-off device (motorized valve)
is considered. The switch-on delay of the heat generator will ensure proper
circulation inside the heat generator when the burner is switched on.
Actuators with a reversible motor must be operated by means of a slave relay with
double throw contact (separated control phases L
open
/L
closed
).
Operation:
Note on operation Key / parameter tree Parameter
Activation PP (type 26)
HYDRAULIC PARAMETER 06
or
PARAMETER 07