Temperature Limits And Forced Starts And Stops; Hot Water; Basic Settings - Danfoss DHP-R 7Ua User Manual

The room temperature feedback function can be complemented with a time
based adjustment of the room temperature set point. In the week schedule
Calendar room temp desired time periods when a different temperature set
point is desired can be entered. How much the set point is to be adjusted is
entered in the setting Calendar offset.
The setting Curve offset provides a mean to manually shift the whole set point
curve for the primary supply temperature, affecting the set point equally for all
outdoor temperatures.
2�1�6 Temperature limits and forced starts and stops
The primary supply set point curve, together with room feedback and manual
adjustment, can result in virtually any value for the primary supply set point. In
order to ensure that the primary supply temperature stays within reasonable
limits there are settings for how high and low the set point may be. These set-
ting are Max system temp and Min system temp.
The integral changes relatively slowly. After a system restart, for example after
a power failure, it may take a while for heat production to start, as the integral
starts at zero. In order to speed up the heating after a restart it is possible to
activate forced start conditions. If the primary supply temperature falls more
than Lim force hp start degrees below the set point, the integral is forced to
the starting value for the first heat pump, unless that limit has already been
passed. If the controller error falls below Lim force eh start, the integral is set to
the start auxiliary heater limit.
Forced stops works in a similar way when the primary supply temperature gets
significantly higher than the set point. The auxiliary heater is stopped when
the controller error is two degrees below Lim force hp start. The heat pumps
are stopped exactly at the Lim force hp start limit.
The forced starts and stops are inactivated if these settings are set to zero.
2�2 Hot water
2�2�1 Basic settings
Every pump has a setting that decides whether it can be used to make hot
water or not. Heat pumps that can produce hot water have a switchover valve
that switches from heat production to hot water production.
The factory setting is that hot water production is stopped when the opera-
ting pressure switch is triggered. This setting can be changed so that it instead
stops when a temperature limit is reached.
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