sauter EQJW146F002, Руководство пользователя

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84 EQJW146F002 EN
Functions of the heating circuit
6.5 Buffer tanks stems Anl 16.x
A heating characteristic based on a gradient or four entered points can be set in PA1 for the
buffer tanks in systems Anl 16.x. A buffer tank set point for day operation and a buffer tank
set point for night operation can be set without outdoor sensors in the customer level. An ex-
ternal demand transmitted from secondary controlled heating circuits, DHW circuit or an ex-
ternal request (over a 0 to 10 V or binary signal) can override the current buffer tank set
point. The maximum demand is indicated as the buffer tank set point for SF1. If the tempera-
ture falls below the buffer tank set point at SF1, charging of the buffer tank is started.
The set point of the charging temperature is determined by the 'Minimum set point to charge
buffer tank' parameter setting in the PA1 level. The automatic adaptation ('OT' setting) caus-
es the set point of the charging temperature to always be above the current buffer tank set
point by the value entered in 'Charging temperature boost'. Every other value entered in
'Minimum set point to charge buffer tank' is used as the minum set point for the charging
temperature which first starts to be variable at higher buffer tank set points. When a return
flow temperature sensor RüF1 is used, the charging pump SLP (CO1 > F22 - 1) is first re-
leased to avoid cold charging when the temperature measured at RüF1 has reached the
same temperature measured at SF1. The 'Stop charging of the buffer tank' parameter
(PA1 > P17, default = AT) determines under which conditions the charging of the buffer tank
is stopped. The automatic adaptation ('OT' setting) causes the buffer tank charging to be
stopped when the temperature in the buffer tank reaches the value ('Buffer tank set point' +
'Hysteresis of buffer tank'. Every other value entered for 'Stop charging of the buffer tank' is
rated as a fixed switch-off temperature for the buffer tank charging. When SF2
(CO1 > F06 - 1) is configured, SF2 is always used to stop the charging of the buffer tank.
The storage tank charging pump is not switched off until the lag time (entered 'Valve transit
time Ty' for RK1 multiplied by 'Lag time of charging pump') has elapsed. The operation of
the feeder pump UP1 is either determined by the ZP time schedule or prompted over an ex-
ternal demand. For systems with downstream control circuits, either only this external de-
mand or the demand of the downstream control circuits causes the feeder pump UP1 to be
activated, depending on the CO5 > F14 setting.In systems Anl 16.3, 16.4 and 16.6, a solar
circuit is integrated, which uses sensor SF2 for control. The collector circuit pump CP is acti-
vated when the temperature at the collector sensor RüF2 is higher than that at storage tank
sensor SF2 by the value entered in 'Solar circuit pump ON'. It is deactivated when the tem-
perature difference falls below the valve entered in 'Solar circuit pump OFF', when the tem-
perature at the storage tank sensor SF2 reaches 'Max. storage tank temperature' or when the
collector temperature rises above 120 °C.