13
Installation, operation and maintenance instructions - VMGFE102
9.3 - Water heat exchanger water fl ow rate
AR05
Flow rate, l/s
Minimum
Maximum*
Maximum dual pump**
Low pressure***
High pressure***
039
0.9
3.0
2.9
3.4
045
0.9
3.4
3.2
3.8
050
0.9
4.2
3.7
4.4
060
0.9
5.0
4.1
5.0
070
1.0
5.0
4.1
5.0
078
1.2
5.5
4.4
5.2
080
1.2
6.8
5.1
6.2
090
1.3
6.8
5.1
6.2
100
1.5
7.7
6.3
6.5
120
1.7
8.5
6.5
8.0
140
2.0
10.6
7.9
8.7
160
2.3
11.2
8.2
8.9
* Maximum
fl ow rate at a pressure drop of 100 kPa in the plate heat exchanger (unit
without hydronic module).
** Maximum
fl ow rate at an available pressure of 20 kPa (unit with low-pressure
hydronic module) or 50 kPa (high-pressure module).
*** Maximum
fl ow rate with single pump is 2 to 4% higher, depending on the size
9.4 - Minimum water fl ow rate
If the installation fl ow rate is below the minimum fl ow rate,
there is a risk of excessive fouling.
9.5 - Maximum water heat exchanger water fl ow rate
This is limited by the permitted water heat exchanger
pressure drop. Also, a minimum water heat exchanger ∆T of 2.8
K must be guaranteed, which corresponds to a water fl ow rate
of 0.09 l/s per kW.
9.6 - Water loop volume
9.6.1 - Minimum water loop volume
The minimum water loop volume, in litres, is given by the
following formula:
Volume (l) = CAP (kW) x N, where CAP is the nominal cooling
capacity at nominal operating conditions.
Application
N
Air conditioning
AR05 039 to 160
2.5
Industrial process cooling
AR05 039 to 160
(See note)
NOTE: For industrial process cooling applications, where high
stability of the water temperature levels must be achieved,
the values above must be increased.
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. This tank should be equipped with
baffl
es to allow mixing of the fl uid (water or brine). Please
refer to the examples below.
9.2 - Operating range, standard units - heating mode
Condenser
Minimum
Maximum
Entering water temperature at start-up
°C
8
45
Leaving water temperature during operation
°C
25
55
Entering/leaving water temperature diff erence
K
3
10
Evaporator
Minimum
Maximum
Air temperature
°C
-15
40
Note:
Do not exceed the maximum operating temperature.
NOTE: This operating range applies up top 130 Pa static
pressure without suction air duct for sizes 060, 070 and 078
and 140-160, and up to 240 Pa for all other sizes.
AR05 - heating mode
9 APPLICATION DATA
9.1 - Operating range, standard units - cooling mode
Evaporator
Minimum
Maximum
Entering water temperature at start-up
°C
7.5*
30
Leaving water temperature during operation
°C
5**
20
Entering/leaving water temperature diff erence
K
3
10
Condenser
Minimum
Maximum
Entering air temperature AR05***
°C
-10
48
Note:
Do not exceed the maximum operating temperature.
*
For entering water temperatures below 7.5°C at start-up, contact Danfoss.
**
For low-temperature applications, where the leaving water temperature is below
5°C, a frost protection solution must be used. For low evaporator leaving water
temperatures (< 5°C) please refer to option 6.
*** Maximum outside temperature: Please refer to option 42 for low-temperature
applications (< -10°C). For transport and storage of the AR05 units the minimum
and maximum allowable temperatures are -20°C and +48°C. It is recommended that
these temperatures are used for transport by container.
AR05 - cooling mode
-20
-10
0
10
20
30
40
50
0
5
10
15
20
25
30RQS
30RQSY
Evaporator leaving water temperature, °C
Ent
e
ring air t
emperatur
e
, °C
Bad
Good
Bad
Good
20
25
30
35
40
45
50
55
60
-20
-10
0
10
20
30
40
50
Entering air temperature, °C
L
e
a
ving wat
er t
emperatur
e
, °C
Full load
Part load
Full load
Part load
