Constant Heat; Constant Cooling; Cooling; Cooling Tank And Integral Control - Danfoss DHP-R 7Ua User Manual

settings for seasonal stop to stop the circulation pump and shunt controller.
When this functionality is selected, there are no individual stop limits for the
shunt group.
2�4�3 Constant heat
Constant heat is used to maintain a constant temperature, independent of the
outdoor temperature. In all other respects, the functionality is equivalent to
that of the outdoor compensated curve.
2�4�4 Constant cooling
Constant cooling is used to control a cooling circuit at a constant temperature.
This function is similar to that for constant heat, but is designated for cooling.
This means that the circulation pump and controller are stopped when the
outdoor temperature falls below a configurable stop limit.
2�5 Cooling
With a cooling system the cold side of the heat pumps are used to generate
comfort cooling, or cooling for other purposes. To control a cooling system the
module HPC-CM is used.
2�5�1 Cooling tank and integral control
A cooling tank is used to store chill water. The temperature in the tank is me-
asured and compared to a set point. The difference is integrated, and just as for
heat production the cooling integral is used to control how the tank is cooled.
When the temperature in the cooling tank gets too high the integral becomes
more positive. When the cooling integral passes the limit Start passive cool.
the system begins cooling the tank using passive cooling. This means that the
brine is circulated through the cooling tank and the bore hole without any
heat pump being started. The energy from the cooling tank is transported to
the bore hole.
A prerequisite for passive cooling to work is that the brine temperature is lower
Danfoss – 15