12
6 - APPLICATION DATA
6.1 - Unit operating range
Evaporator
Minimum °C
Maximum °C
Water entering temp. (at start-up)
7.8 *
30
Water leaving temp. (in operation)
5 **
10
Water entering temp. (at shut down)
-
50
Condenser
Entering air temp.
-10***
46***
Do not exceed the maximum operating temperature.
*
For a system requiring operation below 7,8°C, contact Carrier SA.
**
For a system requiring operation below 5°C, anti-freeze must be added to the
unit.
*** Maximum outside temperature: For transport and storage of the 30RY units
the minimum and maximum allowable temperatures are –20°C and +55°C. It
is recommended that these temperatures are used for transport by container.
6.2 - Evaporator water flow rates
30RY
Evaporator water flow
Min. flow rate
Max. flow rate*
Max. flow rate**
Single pump
Dual pump
l/s
l/s
l/s
l/s
017
0.58
1.7
0
1.7
021
0.70
1.8
0
1.9
026
0.81
1.9
0
2.2
033
1.10
2.0
0
3.0
040
1.20
3.5
4.4
3.7
050
1.19
4.0
5.2
4.6
060
1.46
4.4
6.0
5.8
070
1.66
4.6
6.4
6.4
080
1.92
5.5
6.8
7.3
*
Maximum flow rate at an available pressure of 50 kPa (unit with hydronic
module).
**
Maximum flow rate at a pressure drop of 100 kPa in the plate heat exchanger
(unit without hydronic module).
6.3 - Minimum water flow rate
If the installation flow rate is below the minimum flow rate,
recirculation of the evaporator water flow may take place,
leading to the risk of excessive fouling.
6.4 - Maximum evaporator water flow rate
This is limited by the permitted evaporator pressure drop.
Also, a minimum evaporator
∆
T of 2.8 K must be guaranteed,
which corresponds to a water flow rate of 0.9 l/s per kW.
6.5 - Water loop volume
6.5.1 - Minimum water loop volume
The minimum water loop volume, in litres, is given by the
following formula:
Volume = CAP (kW) x N* = litres, where CAP is the nominal
cooling capacity at nominal operating conditions.
Application
N*
Air conditioning
30RY 017-040
3.5
30RY 050-240
2.5
Industrial process cooling
30RY 017-080
(See note)
NOTE: For industrial process cooling applications, where
high stability of the water temperature levels must be
achieved, the values above must be increased.
0
6
7
8
9
10
˚C
-10
0
44
45
46
˚C
44.5
1
2
3
4
5
This volume is required to obtain temperature stability and
precision.
To achieve this volume, it may be necessary to add a storage
tank to the circuit. This tank should be equipped with baffles to
allow mixing of the fluid (water or brine). Please refer to the
examples below.
6.5.2 - Maximum water loop volume
Units with hydronic module incorporate an expansion tank that
limits the water loop volume. The table below gives the
maximum loop volume for pure water or ethylene glycol with
various concentrations.
30RY 017-033
30RY 040-080
(in litres)
(in litres)
Pure water
400
600
Ethylene glycol 10%
300
450
Ethylene glycol 20%
250
400
Ethylene glycol 35%
200
300
EG: Ethylene glycol
6.6 - 30RY unit operating range at full and part load
Notes
1
Evaporator
D
T = 5 K
2
The evaporator and the hydronic circuit pump are frost protected down
to -20°C.
Operating range with required anti-freeze solution and special Pro-Dialog
control configuration
Entering air temperature
Evaporator water leaving temperature
Bad
Good
Bad
Good