Standard And Optional Number Of Water Passes; Evaporator And Condenser Water Flow Rates; Variable Flow Evaporator; System Minimum Water Volume - Carrier 30XW Installation, Operation And Maintenance Instructions
Water-cooled screw chillers
water-sourced screw heat pumps
nominal cooling capacity: 273-1756 kw
nominal heating capacity: 317-1989 kw
50 hz
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Also See for 30XW:
- Operation instructions manual (39 pages) ,
- User manual (56 pages) ,
- Installation, operation and maintenance instructions (52 pages)
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6.5 - Standard and optional number of water passes
Standard-efficiency units 30XW--
Size
254
304
354
Evaporator
Standard
2
2
2
Option 100C
1
1
1
Condenser
Standard
2
2
2
Option 102C
1
1
1
High-efficiency units 30XW-P
Size
Evaporator
Standard
Option 100C
Condenser
Standard
Option 102C
6.6 - Evaporator and condenser water flow rates
These below values are given for standard units. For options 100C and 102C, please refer to the unit selection program.
Standard-efficiency units 30XW--
Size
Evaporator water flow rate, l/s
Minimum
Maximum
Condenser water flow rate, l/s
Minimum
Maximum
High-efficiency units 30XW-P
Size
Evaporator water flow rate, l/s
Minimum
Maximum
Condenser water flow rate, l/s
Minimum
Maximum
Notes
- Minimum evaporator flow rate based on a water velocity of 0,5 m/s.
- Minimum condenser flow rate based on a water velocity of 0,3 m/s.
- Maximum flow rate based on a pressure drop of 120 kPa (units with two evaporator passes and two condenser passes).
6.7 - Variable flow evaporator
Variable evaporator flow can be used. The controlled flow
rate must be higher than the minimum flow given in the
table of permissible flow rates and must not vary by more
than 10% per minute.
If the flow rate changes more rapidly, the system should
contain a minimum of 6.5 litres of water per kW instead of
3.25 l/kW.
It is possible to use a dedicated terminal to connect the
pump drive (0/10V signal) .
Please refer to 30XB/30XA/XAS/XW/XWZE Touch Pilot
control manual.
6.8 - System minimum water volume
Whichever the system, the water loop minimum volume is
given by the formula: Volume = Cap (kW) x N litres
Application
Normal air conditioning
Process type cooling
402
452
552
602
2
2
2
2
1
1
1
1
2
2
2
2
1
1
1
1
512
562
712
2
2
2
1
1
1
2
2
2
1
1
1
254
304
354
402
452
6
6
6
7
7
39
39
39
39
43
4
4
4
4
4
29
29
29
29
47
512
562
712
10
10
13
57
57
76
6
6
8
55
55
74
N
3.25
6.5
652
702
802
852
1002
2
2
2
2
2
1
1
1
1
1
2
2
2
2
2
1
1
1
1
1
812
862
1012
2
2
2
1
1
1
2
2
2
1
1
1
552
602
652
702
802
7
7
9
9
9
43
43
57
57
57
4
4
6
6
6
47
47
55
55
55
812
862
1012
13
13
18
76
76
84
8
8
12
74
74
119
Where Cap is the nominal system cooling capacity (kW) at
the nominal operating conditions of the installation.
This volume is necessary for stable operation.
It is often necessary to add a buffer water tank to the circuit
in order to achieve the required volume. The tank must
itself be internally baffled in order to ensure proper mixing
of the liquid (water or brine). Refer to the examples below.
1052
1154
1252
1352
2
2
2
2
1
1
1
1
2
2
2
2
1
1
1
1
1162
1314
1464
2
2
2
1
1
1
2
2
2
1
1
1
852
1002 1052 1154 1252 1352 1452 1552 1652 1702
9
13
13
15
18
61
67
67
78
84
8
8
8
9
12
82
82
82
109
119
1162
1314
1464
18
22
22
84
116
116
12
18
18
119
130
130
Connection to a buffer tank
Bad
Bad
1452
1552
1652
1702
2
2
2
2
1
1
1
1
2
2
2
2
1
1
1
1
1612
1762
2
2
1
1
2
2
1
1
18
18
18
22
22
84
84
84
116
116
12
12
12
14
14
119
119
119
134
134
1612
1762
28
28
121
121
22
22
149
149
Good
Good
19
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