Technical data
Danfoss DHP-S
! A building heat pump in power
outputs from 20 to 42 kW.
! Filled with R407C (60¡C)
Main parts.......................................... 2
Control and safety devices................ 3
Dimensions and connections.............4
Technical data....................................5
VFGFA102
Main parts
1 Compressor
• Scroll compressor
2 Circulation pumps
• Condenser circulation
• Brine circulation
3
3 Heat exchanger
• Condenser
• Evaporator
• De-superheater
1
2
VFGFA102
Dimensions and connections
1 Coolant out (from HP)
2 Heat return (return line)
3 Return line hot-gas exchanger
4 Supply line hot-gas exchanger
5 Heat supply (supply line)
6 Coolant in (to HP)
7 Lead-in for communication cable
8 Lead-in for incoming power supply and sensors
VFGFA102
Control and safety devices
To ensure a correct function of the heat pump there are a
number of control and safety devices.
The figure below shows the heat pump’s three liquid circuits
with respective safety function.
Compressor
The compressor is equipped with a thermal overload relay
which
protects the compressor from over current.
Thermal overload relay
Figure 2: The thermal overload relay on the electrical panel.
1.
2.
3.
4.
5.
6.
7.
8.
If the thermal overload relay is tripped the alarm indicator on
the front panel is flashing and an alarm text is displayed.
The thermal overload relay must cool down and it is
automatically reset. The alarm is acknowledged by setting
the operational mode to OFF and then back to previous mode
(AUTO/HEATPUMP/ADD. HEAT/HOT WATER).
The compressor is also equipped with an internal protection
which stops the compressor’s operation if it risks being
overheated. The internal protection cannot be reset
manually, the compressor must cool down before it can start
operation.
Brine circut
Evaporator
Compressor
Hot gas exchanger
Condensor
Expansion valve
Refrigerant circut
Heat transfer circuit
Heat transfer circuit
If the pressure in this circuit exceeds the opening pressure of
the safety valve , the valve opens to release the overflow and
then shuts again. The safety valve overflow pipe must have
an open connection to the drain and visibly flow into this in a
frost-free environment.
Refrigerant circuit
The refrigerant circuit’s high pressure side is equipped with a
high pressure switch and one operational pressure switches .
The connected operational pressure switch stops the
compressor when the switching point is reached, that is,
when sufficient amount of heat is produced.
If the operational pressure switch should fail and the pressure
continue to rise, the compressor is stopped by the high
pressure switch when its switching point is reached. The
operation of theheat pump is blocked.
When the problem with the abnormally high pressure is
solved, the pressure switch is automatically reset.
If the high pressure switch is tripped the alarm indicator on
thefront panel is flashing and an alarm text is
displayed.Restart the heat pump by first setting the
operational mode to OFF and then back to previous mode
(AUTO/HEATPUMP/ADD.HEAT/HOT WATER).
The low pressure switch stops the compressor if the pressure
is too low on the low pressure side. The operation of the heat
pump is blocked. When the problem with the abnormally low
pressure is solved, the pressure switch is automatically reset.
If the low pressure switch is tripped the alarm indicator on
the front panel is flashing and an alarm text is displayed.
Restart the heat pump by first setting the operational mode
to OFF and then back to previous mode
(AUTO/HEATPUMP/ADD.HEAT/HOT WATER).
Brine circuit
If the pressure in this circuit exceeds the opening pressure of
the safety valve, the valve opens to release the overflow and
then shuts again. The safety valve overflow pipe must have
an open connection to the drain and visibly flow into this in a
VFGFA102
Circulation pumps
A circulation pump has an internal overload protection. It is
reset automatically when the pump has cooled down.
However, a pump in a 20 to 42kW heat pump has an internal
overload relay that trips the motor protection alarm. The
indication and reset are the same as for the compressor.
Specifications
Please see the technical data tables at the end of this manual
fordetailed specifications.
Technical data
DHP-S
20
26
8.8
11.8
R407C
T brine °C
20
5
-5
-10
5
20
VFGFA102
35
15.7
T water °C
55
60
60
20
20
30
42
19.9