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This flow rate variation is realised, observing the minimum and
maximum admissible unit flow rates as well as the minimum and
maximum pump supply frequency values.
The delta T value maintained can in certain cases be different
from the set point value:
•
If the set point value is too high (achieved for a lower flow
rate than the minimum value or a lower frequency than the
minimum value), the system settles at the minimum flow
rate or minimum frequency and this results in a lower delta
T value than the set point.
•
If the set point value is too low (achieved for a higher flow
rate that the maximum value or a higher frequency than the
maximum value), the system settles at the maximum flow
rate or maximum frequency and this results in a higher delta
T value than the set point.
See with Carrier Service to implement the procedures described
below.
13.4.1 -
Procedure for cleaning the hydraulic circuit
Refer to the procedure for cleaning the hydraulic circuit from
chapter 13.3.1
13.4.2 -
Procedure for controlling the Delta T° setpoint
Once the circuit is cleaned, stop the forced start of the pump and
proceed to the configuration of the unit for the required control
mode.
Modify the control parameters:
-
Set water flow control to ‘temperature differential’
-
Set the value of the required differential temperature.
By default, the unit is factory configured at the minimum speed
(frequency: 50 Hz).
13.5 -
Plate heat exchanger pressure drop (including internal piping) - units without hydraulic module
30RQS/RQSY 039-078
Pressure
drop,
kPa
Water flow rate, l/s
0
10
20
30
40
50
60
70
80
90
100
110
120
130
140
150
0,0 0,5 1,0 1,5 2,0 2,5 3,0 3,5 4,0 4,5 5,0 5,5 6,0
1
2
3
4
5
6
30RQS/RQSY 080-160
Pressure
drop,
kPa
Water flow rate, l/s
0
10
20
30
40
50
60
70
80
90
100
110
120
130
140
150
160
170
180
0
1
2
3
4
5
6
7
8
9
10
11
12
1
2
3
4
5
6
Legend
Legend
1.
30RQS/30RQSY 039
4.
30RQS/30RQSY 060
1.
30RQS/30RQSY 080
4.
30RQS/30RQSY 120
2.
30RQS/30RQSY 045
5.
30RQS/30RQSY 070
2.
30RQS/30RQSY 090
5.
30RQS/30RQSY 140
3. 30RQS/30RQSY 050
6.
30RQS/30RQSY 078
3. 30RQS/30RQSY 100
6.
30RQS/30RQSY 160
13.6 -
Pump pressure/flow rate curve - units with hydronic module (fixed-speed or variable-speed
pump, 50 Hz)
Low-pressure pumps
Pressure
head,
kPa
Water flow rate, l/s
50
70
90
110
130
150
170
190
210
230
250
0
1
2
3
4
5
6
7
8
9
10
11
12
1
2
3
High-pressure pumps
Pressure
head,
kPa
Water flow rate, l/s
50
70
90
110
130
150
170
190
210
230
250
0
1
2
3
4
5
6
7
8
9
10
11
12
1
2
Legend
Legend
1.
30RQS/30RQSY 039-090
1.
30RQS/30RQSY 039-100
2.
30RQS/30RQSY 100-120
2.
30RQS/30RQSY 120-160
3. 30RQS/30RQSY 140-160
13 - NOMINAL SYSTEM WATER FLOW CONTROL