18
6.2 - Minimum chilled water flow
The minimum chilled water flow is shown in the table in
chapter 6.6.
If the system flow is less than the minimum unit flow rate,
the evaporator flow can be recirculated, as shown in the
diagram.
For minimum chilled water flow rate
Legend
1. Evaporator
2. Recirculation
6.3 - 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 6.6.
•
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 6.5).
•
Bypass the evaporator as shown in the diagram to
obtain a lower evaporator flow rate.
For maximum chilled water flow rate
Legend
1. Evaporator
2. Bypass
Evaporator leaving water temperature, °C
Condenser
lea
ving
w
ater
temper
atur
e,
°C
6.4 - Condenser water flow rate
The minimum and maximum condenser water flow rates
are shown in the table in chapter 6.6.
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 6.5.
15
20
25
30
35
40
45
50
55
0
5
10
15
20
From approx. 45% to full load
Part load limit approx. 35%
Minimum load limit approx.15%
5.7 - 24 and 230 V power reserve for the user
Control circuit reserve:
After all required options have been connected, the TC
transformer includes a power reserve that can be used for
the field control wiring:
•
Unit without option 084*
2 A (24 V a.c.) or 48 VA
•
Unit with option 084*
1.3 A (24 V a.c.) or 30 VA
* 084 or 084R or 084D
As an option, a the 230 V, 50 Hz circuit allows the supply of
a battery charger for a portable computer at 1 A maximum
at 230 V. The connection is via a CEE7/7 type socket (2
poles with earth) located under the control box and
accessible from outside.
6 - APPLICATION DATA
6.1 - Operating limits for 30XW units
30XW--/30XW-P
Minimum
Maximum
Evaporator
Entering temperature at start-up
-
35.0°C
Leaving temperature during operation
3.3°C*
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**
-
Leaving temperature during operation
19.0°C**
50.0°C***
Entering/leaving temperature difference at full load
2.8 K
11.1 K
* 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 5
and option 6.
** 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.
*** Please refer to option 150 for applications with a high condenser leaving
temperature (up to 63°C).
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
units (including by container) the minimum and maximum permissible temperatures
are -20°C and 72°C (and 65°C for option 200).
For more precise details refer to the unit selection program.
1
2
1
2
1
