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Operation and Maintenance
ThermoCooler HP
DSTCH.191101.01.EN
Continuous product development may give rise to specification changes without notice.
Cooling mode
The compressor carries out the work required to run the cooling process. The
evaporator is located in the supply air for the unit. The heat from the outdoor air
is taken up in this coil, thereby cooling the supply air.
The energy supplied to the cooling system from the evaporator and the com-
pressor leaves the unit via the condenser in the extract air.
It is important to ensure that the air volumes are above the specified minimum
flow on both the outdoor air and extract air side. The process cannot work if
these air volumes are not available.
Heating mode
The heating pump function takes the heat content of the extract air and reuses
it, supplying the same heat to the air handling unit’s supply air.
The extract air is the heat pump’s energy source. When the extract air meets the
extract air coil, it is cooled since the coil functions as an evaporator. From the
evaporator, the refrigerant moves to the compressor, where it is compressed.
The refrigerant then moves to the supply air coil, where the energy from the
extract air and the compressor is released. The energy remaining in the extract
air downstream of the heat pump is then recovered in the rotor.
These two recovery systems give a very high degree of efficiency.
Since the rotor requires less energy to run than the compressor system, this will
be in the first instance. The compressor will only start when the rotor’s energy
recovery is insufficient to heat the supply air.
Compressor
The reversible heat pump is equipped with a speed-controlled PM scroll
compressor.
Depending on its size, the reversible heat pump may be equipped with another
fixed compressor that is step-linked to the speed-controlled compressor.
In the event of an increased power requirement, the frequency inverter will
increase the speed of the compressor.
If the reversible heat pump is equipped with two compressors, the fixed com-
pressor will engage in when the speed-controlled compressor has reached its
maximum speed. The speed-controlled compressor returns to its minimum
speed and can then adjust back up to maximum speed. This achieves infinitely
adjustable cooling power.
The function is reversed where less cooling is needed.
