AM, EM, AQ, BA, ASW - IOM
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Ing.Ji
ř
í Jiránek
liquid line
vapour line
heat pump box
insulation down inside the cabinet
Performance and completion of heat insulation
3 Earth Exchanger for Direct Evaporating– AQxxD
The same instructions as in the previous chapter apply for completion of the earth exchanger
and piping positioning.
3.1 Principle of Operation
The heat is drawn from the earth through the Cu piping with plastic coating. The coolant (r407c)
circulates directly in the earth exchanger. For this reason it is necessary to adhere to the
number of circles of the earth exchanger and the length of piping to make sure the oil returns to
the compressor. These heat pumps have relatively high amount of coolant and thus it is
necessary to make sure the room is of sufficient volume.
3.2 Collector Piping
Deoxidized, plugged Cu piping with PE or PVC coating and certification for cooling equipment
must be used for installation. The piping must be certified per EN12735-1.
Usually piping of 12mm DIA, 65m long, or 14mm DIA, 75m long are available.
Never use
piping designed for water.
The following table lists numbers of earth collector loops.
piping Cu12x65m
piping Cu14x75m
Typ T
Č
heat.capacity
[kW] E0W35
land area
[m
2
]
loops
length[m]
loops
length[m]
AQ9Z1D
3,2
130
2
130
-
-
AQ26ZD
10,1
350
8
520
6
450
AQ30ZD
11,4
400
8
520
6
450
AQ37ZD
14,1
500
10
650
8
600
AQ45ZD
17,2
600
12
780
10
750
AQ50ZD
18,5
600
12
780
10
750
AQ60ZD
22,8
800
-
-
12
900
3.2.1 Distributor and Collector
Depending on the type of the heat pump and piping used, a proper distributor and coolant
collector must be ordered as equipment. It is not allowed to use components of other suppliers.
The distributor is specially designed for correct operation. Sets for 4, 6, 8, 10, and 12 circuits are
available. The distributor must be installed vertically with straight liquid pipe at least 50cm long.