Danfoss DHP-AQ, Руководство по установке

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If the pressure transmitter (7) registers too low pressure in the refrigerant circuit, the heat pump's normal opera-
tion is blocked, an alarm indicator on the heat pump's control panel flashes and a warning text appears in the
display of the control panel. The blocked heat pump is reset by setting the operating mode to OFF and then back
to the previously selected mode. The pressure transmitter is also used to monitor temperature and pressure at
compressor start. Deviations are handled in the same way as low pressure.
Compressor (8)
The compressor is equipped with a thermal over current relay to protect the compressor against over current.
If the over current relay (see figure below) is activated, the heat pump's normal operation is blocked, an alarm
indicator on the control unit's control panel flashes and a warning text appears in the display of the control panel.
The blocked heat pump is reset by setting the operating mode to OFF and then back to the previously selected
mode.
The compressor is also equipped with an internal protector that stops the compressor if it risks becoming overhea-
ted. The internal protector cannot be reset manually, the compressor must cool before it can be restarted. No
alarm connected to this protector.
The discharge pipe sensor (10) stops the compressor at too high pressurised gas temperature. This is indicated in
the display by a square. The stop is ceased when the temperature becomes normal.
Fan (9)
The fan motor is equipped with motor protection. If this is activated, the heat pump's normal operation is blocked,
an alarm indicator on the control unit's control panel flashes and a warning text appears in the display of the con-
trol panel.
Alarms can be caused by objects sticking in the fan or the fan having frozen solid. Rectify the cause of the alarm
and reset the heat pump by setting the operating mode to OFF and then back to the previously selected mode.
Speed (rpm) controlled circulation pump
The circulation pump has an internal overload protector, which is reset automatically after cooling.
The overload protector also activates the alarm for the circulation pump and blocks the heat pump's normal oper-
ation. Indication occurs by the alarm indicator flashing on the control unit's control panel and a warning text
appears in the display of the control panel. The circulation pump will attempt to start for 45 seconds every 5
minutes to try to acknowledge the alarm automatically. If the function is not normal after 5 start attempts the heat
pump is constantly blocked and must be reset by setting the operating mode to OFF and then back to the previ-
ously selected mode.
Alarm mode
If an alarm that affects the heat pump's normal operation is activated this will be indicated in the control panel's
display window. In order to further attract attention, the heat pump will not produce hot water.
The heat pump will initially try to meet the heat demand using the compressor. If this is not possible, the built-in
electric heating element engages.
Immersion heater
The auxiliary heater consists of an electric heating element mounted on the heating system supply line. It has an
overheat protector that switches off the electric heating element if it is at risk of becoming overheated. The over-
heat protector's control panel is located in the control unit (see the image below).
If the overheat protector is activated an alarm indicator flashes on the heat pump's control panel and a warning
text appears.
The overheat protector is reset by pushing the reset button, which is on the overheat protector.
Electrical system
22 – Installation instructions VMGFD102