Danfoss DHP-AQ, Руководство по установке

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4.2.2 Indoor unit
1
DHP-AQ Mini
1
2
4
3
5
DHP-AQ Maxi
1
2
3
4
DHP-AQ Midi
Position Description
1 Control module (transparent in image)
2 Immersion heater
3 Reversing valve
4 Circulation pump
5 Water heater
4.2.3 Speed controlled fan
The fan is operated by a permanent solenoid motor with great efficiency. The fan starts at a nominal speed, which
differs depending on the size of output. The fan speed is adjusted up or down as required which is determined by
the temperatures in the refrigerant circuit.
4.2.4 Electronic expansion valve
When the refrigerant passes the expansion valve the pressure and temperature of the refrigerant are reduced. In
this way the energy in the outdoor air is available to the refrigerant circuit. By regulating the opening degree of
the expansion valve one can optimise the flow in the refrigerant circuit in different operating conditions. Control
of the electronic expansion valve is based on the measurements of temperatures and pressures in the refrigerant
circuit and outside air.
4.2.5 Auxiliary heat
An auxiliary heater is included in DHP-AQ Midi and DHP-AQ Maxi and consists of an immersion heater, which is
located on the supply line ahead of the reversing valve. An immersion heater is available for DHP-AQ Mini as an
accessory. Also see System solution, Page 24, pos 114.
Immersion heaters in the DHP-AQ series intended for 400V supply voltage have three heating elements and can be
controlled in five power stages. Products for 230V have two heating elements and are controlled in three power
stages.
The parameter MAX STEP determines the number of power stages the immersion heater can be controlled to. The
two stages 4 and 5 cannot be engaged when the compressor is in operation as opposed to 4 and +5
where it is possible.
With an internal immersion heater which is controlled by several power stages an external auxiliary heater, for
example an electric boiler, can be controlled using the potential free output 101.8 – 101.16.
If an immersion heater of a different type is used that requires a start signal in DHP-AQ Mini (placed before the hot
water reversing valve) the auxiliary heater is controlled from the potential free output 101.8 – 101.16. The parame-
ter MAX STEP is set to ”P”.
16 – Installation instructions VMGFD102