Plate Heat Exchanger Pressure Drop (Including Internal Piping) - Units Without Hydraulic Module; Pump Pressure/Flow Rate Curve - Units With Hydronic Module (Fixed-Speed Or Variable-Speed Pump, 50 Hz) - Carrier AquaSnap Touch Pilot Junior Series Installation, Operation And Maintenance Instructions
Reversible air-to-water heat pumps
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13 - NOMINAL SYSTEM WATER FLOW CONTROL
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.
13.5 - Plate heat exchanger pressure drop (including internal piping) - units without hydraulic module
30RQS/RQSY 039-078
150
140
130
120
110
100
90
80
70
60
50
40
30
20
10
0
0,0
0,5
1,0
1,5
2,0
Water flow rate, l/s
Legend
1.
30RQS/30RQSY 039
2.
30RQS/30RQSY 045
3.
30RQS/30RQSY 050
13.6 - Pump pressure/flow rate curve - units with hydronic module (fixed-speed or variable-speed
pump, 50 Hz)
Low-pressure pumps
250
230
210
190
170
150
130
110
90
70
50
0
1
2
3
4
Water flow rate, l/s
Legend
1.
30RQS/30RQSY 039-090
2.
30RQS/30RQSY 100-120
3.
30RQS/30RQSY 140-160
40
5
4
2
3
6
1
2,5
3,0
3,5
4,0
4,5
5,0
4.
30RQS/30RQSY 060
5.
30RQS/30RQSY 070
6.
30RQS/30RQSY 078
1
2
3
5
6
7
8
9
10
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).
180
170
160
150
140
130
120
110
100
90
80
70
60
50
40
30
20
10
0
0
1
2
5,5
6,0
Legend
1.
30RQS/30RQSY 080
2.
30RQS/30RQSY 090
3.
30RQS/30RQSY 100
250
230
210
190
170
150
130
110
90
70
50
11
12
0
1
2
Legend
1.
30RQS/30RQSY 039-100
2.
30RQS/30RQSY 120-160
30RQS/RQSY 080-160
3
2
1
3
4
5
6
7
8
Water flow rate, l/s
4.
30RQS/30RQSY 120
5.
30RQS/30RQSY 140
6.
30RQS/30RQSY 160
High-pressure pumps
1
3
4
5
6
7
8
Water flow rate, l/s
6
5
4
9
10
11
12
2
9
10
11
12
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