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30RA/30RH
Unit protection devices, operating limits and operating range
Table III: Pressure switch settings
Cut-out
High pressurestat
30 bar
WARNING:
Alteration of factory settings other than the design set-point, without
manufacturer's authorisation, may void the warranty.
In case of use other than the manufacturer configuration, Carrier
Service must be asked for permission to change the Pro-Dialog Plus
system configuration.
30RA - Operating limits
These units have been designed to operate within the following limits:
Evaporator
Water entering temp. (at start-up)
Water leaving temp. (in operation)
Water entering temp. (at shut-down)
Condenser
Air entering temperature
30RH - Operating limits
Cooling cycle
Plate heat exchanger
Water entering temp. (at start-up)
Water leaving temp. (in operation)
Water entering temp. (at shut-down)
Coil
Air entering temperature
Heating cycle
Plate heat exchanger
Water entering temp. (at start-up)
Water leaving temp. (in operation)
Water entering temp. (at shut-down)
Coil
Air entering temperature
*
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
rate, l/s
017
0,45
021
0,57
026
0,67
033
0,87
*
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
x N = Litres
(kW)
where CAP is the nominal system capacity (kW) at nominal
operating conditions of the installation.
Application
Air conditioning
Industrial process cooling
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.
GB - 12
Reset
Manual
Minimum C Maximum C
7,8
*
30
5**
13
-
55
-10
46
Minimum C Maximum C
7.8
*
30
5**
13
-
55
-10
46
Minimum C Maximum C
10
45
25
50
-
55
Minimum C Maximum C
-10
20
Maximum flow
Maximum flow
rate, l/s*
rate, l/s**
1,4
1,3
1,6
1,6
2,1
1,9
2,3
2,4
N
3.5
See note
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
50
46
42
38
34
30
26
22
18
14
10
6
2
-2
-6
-10
-14
-1 0
1 2
4 5
3
Leaving water temperature C
Operating range - 30RH units
50
46
42
38
34
30
26
22
18
14
10
6
2
-2
-6
-10
-14
-1 0
1 2
3
Leaving water temperature C
25
20
15
10
5
0
-5
-10
-15
20
25
30
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 -10 C.
Operating range with anti-freeze solution and with special
configuration of the Pro-Dialog control system.
6
8
9 10 11 12 13 14
7
4 5
6
8
9 10 11 12 13 14
7
35
55
40
45
50
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