AHI Carrier Catalog | Page 220

Operating limits

30WG
WATER-COOLED / CONDENSERLESS LIQUID CHILLERS 30WG / 30WGA 020-090
COOLING
30WG Min Max
Evaporator Entering water temperature at start-up
° C
7.5 *
27
Leaving water temperature during
° C
5 **
20
operation
Entering / leaving water temperature
K
2.5
7
difference
Condenser Entering water temperature at start-up
° C
15 ***
55 ****
Leaving water temperature during
° C
20
60
operation
Entering / leaving water temperature difference
K
2.5
18
*
For entering water temperatures below 7.5 ° C at start-up , contact Carrier .
**
If the leaving water temperature is below 5 ° C , a frost protection solution must
be used . Please refer to option 6 for evaporator leaving water low-temperature
applications (< 5 ° C ).
***
For applications with a condenser entering temperature below 15 ° C the use of a
three-way valve is recommended . This three-way valve can be controlled by the 0-10
V analogue output of the Pro-Dialog + control .
**** For a water flow rate that corresponds to a maximum water-side temperature
difference of 5 K .
30WG + drycooler Min Max
Evaporator Entering water temperature at start-up
° C
7.5 *
27
Leaving water temperature during
° C
5 **
20
operation
Entering / leaving water temperature
K
2.5
7
difference
Condenser without hydronic kit Entering air temperature at start-up + during operation
° C
10-15 ***
40-45 ****
Condenser with option 270V ( kit with variable-speed pump )
Entering air temperature at start-up + during operation
° C
-10 †
40-45 ****
*
For entering water temperatures below 7.5 ° C at start-up , contact Carrier .
**
If the leaving water temperature is below 5 ° C , a frost protection solution must be used .
Please refer to option 6 for evaporator leaving water low-temperature applications (< 5 ° C ).
***
The minimum entering air temperature is based on the drycooler selection .
**** The maximum entering air temperature is based on the drycooler selection .
†
For applications with a low condenser entering air temperature the use of a three-way
valve is recommended . This thre-way valve can be controlled by the 0-10 V analogue
output of the Pro-Dialog + control .
30WGA
30WG + option 6 Min Max
Evaporator Entering water temperature at start-up
° C
-9.5*
27
Leaving water temperature during
° C
-12*
20
operation
Entering / leaving water temperature
K
2.5
3
difference
Condenser Entering water temperature at start-up
° C
15 **
55 ***
Leaving water temperature during
° C
20
60
operation
Entering / leaving water temperature difference
K
2.5
18
Note : Do not exceed the maximum operating temperature .
*
A frost protection solution must be used .
**
For applications with a condenser entering temperature below 15 ° C the use of a
three-way valve is recommended . This three-way valve can be controlled by the 0-10
V analogue output of the Pro-Dialog + control .
***
For a water flow rate that corresponds to a maximum water-side temperature
difference of 5 K .

Operating ranges

30WG
30WGA Min Max
Evaporator Entering water temperature at start-up
° C
7.5 *
27
Leaving water temperature during
° C
5 **
20
operation
Entering / leaving water temperature
K
2,5
7
difference
Air entering temperature ( at start-up and during operation )*** Air entering temperature ( fixed-speed fan )
° C
0 ***
35 to 48 ‡
Air entering temperature ( variable-speed
° C
-10 to -20 †
35 to 48 ‡
fan )
* For entering water temperatures below 7.5 ° C at start-up , contact Carrier .
** 30WGA unit can operate down to 0 ° C if the configuration of the fluid type used is modified . If the leaving water temperature is below 5 ° C , a frost protection solution must be used .
*** The minimum temperature range is based on the condenser selected . If the condenser only has a few fan stages , the use of variable-speed fans is recommended from 10 ° C . † The minimum temperature range is based on the condenser selected . ‡ The maximum temperature range is based on the condenser selected .
30WGA
Condenser leaving water temperature , ° C
65
60
55
50
45
40
Option 6
Standard
35
30
25
20
15
-14 -12 -10 -8 -6 -4 -2
0
2
4
6
8 10 12 14 16 18 20
Evaporator leaving water temperature , ° C
Condensing temperatre , ° C
65 60 55 50 45 40 35 30 25 20
Medium temperature application
Standard
-2 0 2 4 6 8 10 12 14 16 18 20
Evaporator leaving water temperature , ° C
30WG standard unit 30WG unit with option 6 ( brine ) Option 6 : Very low-temperature glycol solution
30WGA standard unit 30WGA unit for medium temperature application (% glycol < 25 %)
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