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Flow control
Line Nr
Programming line
3720
Switching integral
3723
Locking time
Switching integral
The temperature-time integral is a continuous
summation of the temperature diff erential over time.
In this case, the decisive criterion is the diff erence by
which the temperature lies above or below the common
fl ow temperature setpoint.
The temperature-time integral gives consideration
not only to the period of time, but also to the extent of
over-/undershoot. This means that when the crossing
is signifi cant, the supplementary source is released
earlier, or locked earlier, than with minor crossings.
TVx
Actual value of flow temperature
TVw
Flow temperature setpoint
+ Int
Surplus integral
- Int
Deficit integral
t1
Overrun time (not completed)
t2
Overrun time (fully completed)
QX2 Release
output
QX2
QX3 Control
QX3
QX2
QX3
Locking time
The locking time enables the heat pump to reach a
stable operating state before the supplementary source
is allowed to switch on. The supplementary source
is released only when the locking time has elapsed.
The locking time starts as soon as a valid fl ow temperature
setpoint is available. Calculation of the release integral
starts only when the locking time has elapsed.
No consideration is given to the locking time, if the heat
pump malfunctions or is locked, or if the supplementary
source must end DHW charging.
Setting "---" can be used to deactivate the function.
TVxSch Actual value of common flow temperature
TVwSch Setpoint of common flow temperature
A Request
QX2 Release
output
QX2
T Locking
time
QX2
▼ Supplementary source
A supplementary producer can be operated in addition
to the main producer (heat pump).
Release of the supplementary producer depends on a
number of parameters a detailed description of which is
given on the following pages.
• Release is eff ected via release relay QX2.
• 2-position control is eff ected via control relay QX3.
• Ux can be used to transmit the supplementary source
a DC 0...10 V signal for the required temperature/
output setpoint.
Line Nr
Programming line
3692
With DHW charging
Defi nes the release of the supplementary source for
DHW charging:
• Locked
The supplementary source will not be released.
• Substitute
The supplementary source is released only if the main source
cannot be put into operation (e.g. in the event of fault).
• Complement
The supplementary producer is released if the output of
the main producer is not suffi cient.
• Instantly
The supplementary source will always be released.
Line Nr
Programming line
3700
Release below outside temperature
3701
Release under outside temperature
Operation of the supplementary source is released only
when the composite outside temperature lies above or
below the set temperature limit.
This enables the supplementary source to lock in a
selected outside temperature range to ensure bivalent
operation of supplementary source and heat pump.
To ensure continuous release of the supplementary
source, setting "---" must be selected on the respective
operating lines.
If both release values are enabled, the outside
temperature must satisfy both criteria, thus ensuring
release of the supplementary source.
Overtemperature protection
Line Nr
Programming line
3705
Overrun time
Overrun time of release for the external source: If the
integral indicates another heat defi cit before the overrun
time has elapsed, the release remains activated.
If the set overrun time elapses before the common fl ow
temperature drops below the common fl ow temperature
setpoint, the release is deactivated also.
Waterstage / Maintenance Manual / 2105 - EN
