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Building Technologies
Boiler Sequence Controller RMK770
CE1P3132en
HVAC Products
9 Precontrol
23.04.2009
TOeff
TRtLim
TrtLim
Limit value of return temperature limitation
Toeff
Composite (effectively acting) outside temperature
Curvepoint 1 Maximum limit value of the return temperature, effective at low outside temperatures
Curvepoint 2 Minimum limit value of the return temperature, effective at high outside temperatures
Setting Effect
Return temperature curvepoint 1 =
Return temperature curvepoint 2
Constant return temperature limitation.
The outside temperature is irrelevant
Outside temperature curvepoint 1 =
Outside temperature curvepoint 2
Limit value of the return temperature
changes abruptly at the curvepoints
Return temperature curvepoint 1 = ----
Constant return temperature limitation
using curvepoint 2 as the maximum
setpoint of the return temperature. The
outside temperature is irrelevant
Return temperature curvepoint 2 = ----
Constant return temperature limitation
using curvepoint 1 as the maximum
setpoint of the return temperature. The
outside temperature is irrelevant
Return temperature curvepoint 1 and
return temperature curvepoint 2 = ----
Return temperature limitation is deacti-
vated in heating mode
This limitation takes effect when the primary controller needs to provide heat for DHW.
Maximum limitation in heating mode is deactivated.
Maximum limitation during DHW heating is constant, that is, independent of the outside
temperature.
Limitation can be overridden by maximum limitation during DHW heating when the
legionella function is active. For more detailed information, see below.
Again, this limitation is activated only when a valid value is set. If the value is invalid
(entry of “----“), there is no limitation.
This limitation takes effect when the legionella function of a DHW circuit connected to
the primary controller is active. In that case, the maximum limitations during heating
mode and DHW heating are deactivated.
Maximum limitation during DHW heating with the legionella function activated is constant,
that is, independent of the outside temperature. Again, this limitation is activated only
when a valid value is set. If the value is invalid (entry of “----“), there is no limitation.
9.8.4
Pulse limitation
The primary controller can accept pulses for limiting the output of heat or the volumetric
flow. Prerequisite for pulse limitation is a primary controller plant with mixing valve.
The pulses are delivered via the meter inputs of function block “Meters”. For more
detailed information about function block “Meters”, refer to chapter 11 “Data acquisition“
After having configured one or several meter inputs, pulse limitation can be set up.
Special cases:
Maximum limitation
during DHW heating
Maximum limitation
during DHW heating
when legionella
function is active
Meter inputs
