TAC 2112, Руководство пользователя, Страница: 44 / 70

TAC 2112, Manual Functional Description
7:12 (22), 0-004-7459-3 (GB) 1999-08-01, TAC AB
7.3.9 Pump control
The pump control acts to utilise the heat accumulated in the building
as efficiently as possible by allowing the circulation pump to operate
only when there is a specific heating requirement.
Pump stop
The circulation pump is stopped and the setpoint for the supply
temperature is set to
Min. supply temperature in the following cases:
•
The outdoor temperature exceeds the Outdoor temperature for
pump stop limit.
•
The calculated setpoint for the supply temperature is less than the
Supply temperature for pump stop limit.
The pump stop has a fixed switch-off delay of 5 minutes, i.e. the
pump runs for at least 5 minutes every time (does not apply for pump
exercise – see below).
Restarting the pump
The circulation pump is restarted with a fixed hysteresis of 1.5
°
C.
The pump can be restarted only after a set time, the Min. pump off
time . However, the pump can be started immediately in the event of
frost protection if so required (see below) or in operating modes other
than timed operation.
Pump exercise
The pump starts at 12:00 and runs for one minute every Monday in
order to prevent pump seizure, for example during the summer
months.
Frost protection
The pump always starts and the valve is controlled whenever the
outdoor temperature is less than +3
°
C in order to prevent freezing in
the heating installation.
Parameters
P No. Parameter Min. Max. Step Default Comments
P 72 Pump stop on/off 0 (off) 1 (on) 1 1 (on) 0=off, 1=on
P 73 Outdoor temp. for pump stop 3 °C 50 °C 1 °C 20 °C
P 74 Supply temp., pump stop 0 °C 120 °C 1 °C 20 °C
P 75 Exercise on/off 0 (off) 1 (on) 1 1 (on) 0=off, 1=on
P 76 Min. pump off time 0 h 12 h 0,5 h 2 h h=hours