Application Data; Operating Limits For 30Xw Units; Minimum Chilled Water Flow; Maximum Chilled Water Flow - Carrier AQUAFORCE 30XW Series Installation, Operation And Maintenance Instructions
Water-cooled screw chillers, water-sourced screw heat pumps
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Also See for AQUAFORCE 30XW Series:
- Installation, operation and maintenance instructions (36 pages) ,
- Operation instructions manual (39 pages) ,
- User manual (56 pages)
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6 - APPLICATION DATA
6.1 - Operating limits for 30XW units
30XW--/30XW-P
Evaporator
Entering temperature at start-up
Leaving temperature during operation
Entering/leaving temperature difference at full load
Condenser
Entering temperature at start-up
Leaving temperature during operation
Entering/leaving temperature difference at full load
(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 6.
(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.
(3) 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).
55
50
45
40
35
30
25
20
15
0
5
Evaporator leaving water temperature, °C
From approx. 45% to full load
Part load limit approx. 35%
Minimum load limit approx.15%
For more precise details refer to the unit selection program.
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.
6.5 - Standard and optional number of water passes
■ Standard-efficiency units 30XW--
Size
254
304
Evaporator
Standard
2
2
Option 100C
1
1
Condenser
Standard
2
2
Option 102C
1
1
Minimum Maximum
-
35,0°C
3,3°C
(1)
20,0°C
2,8 K
11,1 K
13,0°C
(2)
19,0°C
50,0°C
(2)
2,8 K
11,1 K
10
15
20
354
402
452
552
602
2
2
2
2
2
1
1
1
1
1
2
2
2
2
2
1
1
1
1
1
For minimum chilled water flow rate
-
(3)
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
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.
652
702
802
852 1002 1052 1154 1252 1352 1452 1552 1652 1702
2
2
2
2
2
1
1
1
1
1
2
2
2
2
2
1
1
1
1
1
1
1
2
1
2
2
2
2
2
2
1
1
1
1
1
2
2
2
2
2
1
1
1
1
1
2
2
2
1
1
1
2
2
2
1
1
1
23
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