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61 AF
Operating limits
These units have been designed to operate within the following limits:
61AF
Plate heat Exchanger
Entering water temperature at start-up
Leaving water temperature during operation
Entering/leaving water temperature difference
Coil
Entering air temperature*
* Outside temperature: For transport and storage of the 61AF units the
minimum and maximum allowable temperatures are - 20°C and +50°C.
It is recommended that these temperatures are used for transport by
container
Note: Do not exceed the maximum operating temperature.
Minimum and maximum water flow rates in the
plate heat exchangers
Plate heat exchanger water flow rate
61AF
014-7
014-9
019-9
* Maximum flow rate at a water temperature diff erence of 3 K in the
plate heat exchanger.
Note: For a domestic hot water application (leaving water temperature
= 65°C), the water temperature difference must be at least 8 K.
Minimum water loop volume
The heat pump is used in a domestic hot water application and must
heat an intermediate loop that supplies domestic hot water via a heat
exchanger. The primary loop is charged with softened water. Regular
checks must be carried out on the water system to detect possible scale
formation. The heat pump in this type of application must never supply
domestic hot water directly. The minimum water loop volume, in litres,
is given by the following formula:
Volume (l) = CAP (kW) x N, where CAP is the nominal heating capacity
at nominal operating conditions. N=5. This volume is required to obtain
temperature stability and precision. To achieve this volume, it may be
necessary to add a storage tank to the circuit.
Operating range
GB - 12
Minimum
Maximum
°C
8
°C
30
K
3
°C
-20
Flow rate, [l/s]
Minimum
Maximum*
0,2
1,1
0,2
1,1
0,3
1,6
70
70
70
70
70
70
70
70
70
70
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70
70
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70
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70
70
70
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70
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70
70
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70
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70
70
70
65
65
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65
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65
65
65
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65
65
65
65
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65
65
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65
65
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65
65
65
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65
65
65
65
65
65
65
65
65
60
60
60
60
60
60
60
60
60
60
60
60
60
60
60
60
60
60
60
60
60
60
60
60
60
60
60
60
60
60
60
60
60
60
60
60
60
60
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60
60
60
60
60
60
60
60
60
60
60
60
60
60
60
60
60
60
60
60
60
60
55
55
55
55
55
55
55
55
55
55
55
55
55
55
55
55
55
55
55
55
55
55
55
55
55
55
55
55
55
55
55
55
55
55
55
55
55
55
55
55
55
55
55
55
55
55
55
55
55
55
55
55
55
55
50
50
50
50
50
50
50
50
50
50
50
50
50
50
50
50
50
50
50
50
50
50
50
50
50
50
50
50
50
50
50
50
50
50
50
50
50
50
50
50
50
50
50
50
50
50
50
50
50
50
45
45
45
45
45
45
45
45
45
45
45
45
45
45
45
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45
45
45
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45
45
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45
45
45
45
45
45
45
45
45
45
45
45
45
45
45
45
45
45
45
40
40
40
40
40
40
40
40
40
40
40
40
40
40
40
40
40
40
40
40
40
40
40
40
40
40
40
40
40
40
40
40
40
40
40
40
40
35
35
35
35
35
35
35
35
35
35
35
35
35
35
35
35
35
35
35
35
35
35
35
35
35
35
35
35
35
35
35
30
30
30
30
30
30
30
30
30
30
30
30
30
30
30
30
30
30
30
30
30
30
30
30
30
25
25
25
25
25
25
25
25
25
25
25
25
25
25
25
25
25
25
20
20
20
20
20
20
20
20
20
20
20
20
-25
-25
-25
-25
-25
-25
-25
-25
-25
-25
-20
-20
-20
-20
-20
-20
-20
-20
-20
-20
-15
-15
-15
-15
-15
-15
-15
-15
-15
-15
-10
-10
-10
-10
-10
-10
-10
-10
-10
-10
-5
-5
-5
-5
-5
-5
-5
-5
-5
-5
This tank should be equipped with baffles to allow mixing of the fluid
(water or brine). Please refer to the examples below.
57
65
10
40
It is often necessary to add a buffer water tank to the circuit in order to
achieve the required volume.
Expansion tank volume
Units with hydronic module do not incorporate an expansion tank.
This must be included in the water loop.
The table below gives the Expansion tank volume that must be
provided, based on the water loop volume, the fluid used and its
concentration.
Expansion Tank Volume required
pure water
10% ethylene glicol
20% ethylene glicol
30% ethylene glicol
40% ethylene glicol
61AF 014- 019
0
0
0
0
0
0
0
0
0
0
5
5
5
5
5
5
5
5
5
5
10
10
10
10
10
10
10
10
10
10
15
15
15
15
15
15
15
15
15
15
20
20
20
20
20
20
20
20
20
20
25
25
25
25
25
25
25
25
25
25
Outdoor Air Temperature [°C]
Bad
Good
Bad
Good
% of water loop volume
30
30
30
30
30
30
30
30
30
30
35
35
35
35
35
35
35
35
35
35
40
40
40
40
40
40
40
40
40
40
45
45
45
45
45
45
45
45
45
45
3
3
3,5
3,8
4,2
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