Capacity-Dependent Sequence; Sequence Lock; Lag Delay - Samson TROVIS 5474 Mounting And Operating Instructions

Function
Releasing sequence
Parameters
Lockout time
Temperature t for releasing sequence
A

5.2.3 Capacity-dependent sequence

The lead boiler is activated when the flow temperature falls below the flow temperature set point
by the Hysteresis . In the event of a demand for increased capacity, the lead boiler switches to
the second stage. The second boiler is also activated if 90 % of its maximum load is not sufficient
over the time period of t = 2 x Lockout time to increase the flow temperature to the required flow
temperature set point and the set point hysteresis is not reached within the tolerance time.
The lag boiler is switched off when one of the following conditions is fulfilled:
4
The current load of both boilers is less than 90 %.
4
The actual temperature is greater than the set point and hysteresis added together as well as
its tendency shows that the temperature will not fall below this total within the tolerance time.
Function
Releasing sequence
Parameter
Lockout time

5.2.4 Sequence lock

The binary input BE11 is used to lock the sequence. The input of the outdoor temperature is de-
termined by the binary input. The outdoor sensor is not required.
Function
Outdoor sensor

5.2.5 Lag delay

The Lag delay parameter helps minimize losses during start-up in the event of short-term de-
mands. The second boiler is first switched on when required after the time in Lag delay has
elapsed. The time countdown is shown in the InF5 level.
WE Configuration
ON Co5 -> Fb07 = ON
WE Parameter level / Range of values
2 min PA5 / 0 to 99 min
12 °C PA5 / –40 to 50 °C
WE Configuration
ON Co5 -> Fb07 = OFF
WE Parameter level / Range of values
2 min PA5 / 0 to 99 min
WE Configuration
ON Co5 -> Fb00 = OFF, select: FoAUS
Boiler functions
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EB 5474 EN