Danfoss DHP-R 7Ua User Manual page 22

3�6�1 Heat pump
Operational mode
This setting decides what the heat pump can do. Standby means that the heat
pump is turned off and Auto that it is controlled by the master controller. Heat
only and Tap water only are settings that allow the master to control the heat
pump, but only to make heat or tap water.
Hot water production
This setting tells the control system whether this heat pump can be used to
make hot water or not.
Compressor delay
When the heat pump starts, the compressor is started some seconds after the
brine pump. This setting decides how long the delay should be.
min start interval
In order to prevent the heat pump from starting and stopping too often, this
setting decides the minimum time between two starts.
Control press delay
If the control pressostat is active for longer than this setting specifies, an alarm
is generated and the heat pump is stopped.
Cp while heating
This setting activates and inactivates the control pressostat alarm when the
heat pump is producing heat.
Hot water stop cond�
This setting decides whether the heat pump should stop making hot water
when the hot water temperature limit is reached, or whether it should conti-
nue as long as possible until the control pressostat triggers.
return temp limit
Alarm limit for high temperature on heat pump return. When the alarm is trig-
gered, the heat pump is stopped until the temperature drops. This alarm is
disabled when the heat pump is making hot water.
maxrettemp hw delay
The return temperature alarm is also blocked for a while when it has stopped
making hot water. This setting decides for how long.
Tempdiff Brine
This is an alarm limit that triggers an alarm when the difference between the
brine inlet and outlet temperatures becomes greater than the limit. A large
difference makes the heat pump less efficient and is an indicator of low brine
flow, which may be caused by a clogged filter.
Pressure/flow guard
This setting tells the control system whether the brine flow is monitored using
a flow guard or a pressure guard.
22 – Danfoss