Honeywell DHC, Service Manual

Page: 176 / 262

Hydraulic Components SDC / DHC
176 EN2H-0221GE51 R0812
a Calculation by the
controller based on the
outside temperature
b 21°C parameter 45 without
room sensor
c
Pre-heat time at 0°C
7.3.4.5 Room setpoint ramp
OFF, 0.5 ... 60 K/h
This function is only active in conjunction with an "RC" (room
controller) function. The set value acts as a filter between the
setpoint jump (change of the room setpoint temperature setting)
and the room setpoint at the controller output. The ramp functions
as an artificial down time on the control path and slows
heating/cooling. Configuration of the actual control path is
dependent on this.
In historic buildings (churches, galleries), it is important that
heating up and cooling down are damped via a room setpoint
value ramp so that masonry and artwork are not damaged.
The function starts with the switching times switch-on/switch-off
point and the control mode change.
This function helps prevent jumps in temperature. For this reason:
• The ramp is recalculated starting from the actual room
temperature after a power failure. A setpoint jump does not
occur.
• If a new setpoint jump (setpoint increased, lowering initiated)
occurs before the room setpoint temperature is reached, the
new ramp is recalculated starting with the current actual room
temperature.
• An activated ramp takes affect in all control modes.
7.3.4.6 Heating limit function
This parameter supplements the summer switch-off function. It
deactivates the respective heating circuit as soon as the
computed flow temperature setpoint approaches the current room
temperature setpoint.
The heating limit parameter can be activated separately for each
heating circuit.
Switch-off: Flow setpoint < (current room se heating limit
setting)
Setting range
Function
Application
NOTE
Function