30RA/30RH
Unit protection devices, operating limits and operating range
Table III: Pressure switch settings
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High pressurestat | 30 bar | Manual |
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WARNING:
Alteration of factory settings other than the design
In case of use other than the manufacturer configuration, Carrier Service must be asked for permission to change the
30RA - Operating limits
These units have been designed to operate within the following limits:
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Evaporator | Minimum° C Maximum° C | |
Water entering temp. (at | 7,8 * | 30 |
Water leaving temp. (in operation) | 5** | 13 |
Water entering temp. (at | - | 55 |
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Condenser |
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Air entering temperature | 46 |
30RH - Operating limits
Cooling cycle
Plate heat exchanger | Minimum° C Maximum° C | |
Water entering temp. (at | 7.8* | 30 |
Water leaving temp. (in operation) | 5** | 13 |
Water entering temp. (at | - | 55 |
Coil |
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Air entering temperature | 46 | |
Heating cycle |
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Plate heat exchanger | Minimum° C Maximum° C | |
Water entering temp. (at | 10 | 45 |
Water leaving temp. (in operation) | 25 | 50 |
Water entering temp. (at | - | 55 |
Coil | Minimum° C Maximum° C | |
Air entering temperature | 20 |
*Contact Carrier if an entering water temperature lower than 7.8 ° C is necessary.
**In case of operation with a leaving temperature of less than 5 ° C, it is necessary to add ethylene glycol to the water in circulation.
Minimum and maximum water flow rates in the plate heat exchangers
30 RA RH
| Minimum flow | Maximum flow | Maximum flow |
| rate, l/s | rate, l/s* | rate, l/s** |
017 | 0,45 | 1,4 | 1,3 |
021 | 0,57 | 1,6 | 1,6 |
026 | 0,67 | 2,1 | 1,9 |
033 | 0,87 | 2,3 | 2,4 |
*Maximum water flow rate with an available static pressure of 50 kPa (units with hydronicmodule)
**Maximum water flow rate at a plate heat exchanger pressure drop of 100 kPa (units without hydronic module)
Water circuit water content
Whatever the size of the system, the minimum content of the water circuit is given by the following formula:
Volume = CAP(kW) x N = Litres
where CAP is the nominal system capacity (kW) at nominal operating conditions of the installation.
Application | N |
Air conditioning | 3.5 |
Industrial process cooling | See note |
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This volume is necessary for stable operation and accurate temperature control.
It is often necessary to add a buffer water tank to the circuit in order to achieve the required volume.
NOTE:
For industrial process cooling applications, where high stability of water temperature levels must be achieved, the values above must be increased.
We recommend consulting the factory for these particular applications.
Operating range - 30RA units
°C | 50 |
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46 |
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temperature | 42 |
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38 |
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| 34 |
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| 30 |
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| 22 |
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| 18 |
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air | 14 |
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10 |
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Outdoor | 6 |
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2 |
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| 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 11 12 13 14 | |||||||
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| Leaving water temperature ° C |
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Operating range - 30RH units
| 50 |
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°C | 46 |
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42 |
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temperature | 38 |
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34 |
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| 30 |
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| 26 |
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| 22 |
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| 14 |
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air | 10 |
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6 |
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Outdoor | 2 |
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| 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 11 12 13 14 | |||||||
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| Leaving water temperature ° C |
°C | 25 |
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20 |
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temperature |
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15 |
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air | 0 |
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Outdoor |
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| 20 | 25 | 30 | 35 | 40 | 45 | 50 | 55 |
Leaving water temperature ° C
Notes:
1. The temperature rise of the water through the plate heat exchanger = 5K.
2. Both the plate exchanger and the circuit inside the hydronic module are protected against frost down to a temperature of
Operating range with
GB - 12