17
6 - APPLICATION DATA
6.1 -
30XW-VZE /30XWHVZE Operating limits
30XW-V/30XWHV
Minimum
Maximum
Evaporator
Entering temperature at start-up
-
35,0°C
Leaving temperature during operation
3,3°C
(1)
20,0°C
Entering/leaving temperature difference at full
load
2,8 K
11,1 K
Condenser
Entering temperature at start-up
13,0°C
(2)
-
Leaving temperature during operation
19,0°C
(2)
55,0°C
Entering/leaving temperature difference at full
load
2,8 K
11,1 K
(1) For low-temperature applications, where the leaving water temperature is below
3.3°C, a frost protection solution must be used. Please refer to option 8
(2) For lower condenser temperatures a water flow control valve must be used at
the condenser (two or three-way valve). Please refer to option 152 to ensure
the correct condensing temperature.
15
20
25
30
35
40
45
50
55
60
0
5
10
15
20
Condenser leaving water temperature, °C
Evaporator leaving water temperature, °C
From approx. 60% to full load
Part load limit approx. 50%
Minimum load limit 20%
Note: Ambient temperatures: These units are dedicated for
indoor environment. The external temperature at chiller start
up should be at least 5°C. For such low ambient, option 152
is recommended. During storage and transport of the 30XW-
VZE/30XWHVZE units (including by container) the minimum
and maximum permissible temperatures are -20°C and 70°C.
6.2 -
Condenser-side installation
recommendation
To ensure unit start-up at low condenser water temperature
conditions, a specific installation may be necessary. Please refer
to the table below:
0 < t <
20min
20 < t <
40min
40 < t <
60min
t > 60min
15°C < x
13 < x < 15°C
11 < x < 13°C
8 < x < 11°C
x < 8°C
1
2
3
4
x
Condenser water temperature before start-up
t
Time required to reach a temperature of 19°C at the condenser outlet
1 “The unit can start without the use of a two- or three-way valve, but operation
will be more reliable with the control valve.”
2 “The use of a two- or three-way valve is strongly recommended.”
3 “The use of a two- or three-way valve is compulsory.”
4 The use of a two- or three-way valve is compulsory and the use of variable
speed pumps is strongly recommended.
6.3 -
Minimum chilled water flow
The minimum chilled water flow is shown in the table in chapter
7.7.
If the system flow is less than the minimum unit flow rate, the
evaporator flow can be recirculated, as shown in the diagram.
For munimum chiller flow rate
1
2
Legend
1 Evaporator
2 Recirculation
6.4 -
Maximum chilled water flow
The maximum chilled water flow is limited by the permitted
pressure drop in the evaporator. It is provided in the table in chapter
7.7.
-Select the option with one water pass less that will allow a
higher maximum water flow rate (see option 100C in the table
in chapter 6.6 “Number of passes”.
-Bypass the evaporator as shown in the diagram to obtain a
lower evaporator flow rate.
For maximum chiller flow rate
1
2
Legend
1 Evaporator
2 Bypass
6.5 -
Condenser water flow rate
The minimum and maximum condenser water flow rates are shown
in the table in chapter 7.7 “Evaporator and condenser water flow
rates”.
If the system flow is higher than the maximum unit flow rate, select
the option with one pass less that will allow a higher maximum
water flow rate. Please refer to option 102C in the table in chapter
7.6 “Number of passes”.