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10.3 - Water heat exchanger water flow rate
Flow rate, l/s
30RQS/
Minimum
Maximum*
RQSY
0.9
3.0
039
0.9
3.4
045
0.9
4.2
050
0.9
5.0
060
070
1.0
5.0
078
1.2
5.5
080
1.2
6.8
1.3
6.8
090
1.5
7.7
100
1.7
8.5
120
2.0
10.6
140
2.3
11.2
160
*
Maximum flow rate at a pressure drop of 100 kPa in the plate heat exchanger
(unit without hydronic module).
** Maximum flow rate at an available pressure of 20 kPa (unit with low-pressure
hydronic module) or 50 kPa (high-pressure module).
*** Maximum flow rate with single pump is 2 to 4% higher, depending on the size
10.4 - Minimum water flow rate
If the installation flow rate is below the minimum flow rate,
there is a risk of excessive fouling.
10.5 - Maximum water heat exchanger water flow rate
This is limited by the permitted water heat exchanger
pressure drop. Also, a minimum water heat exchanger ∆T of
2.8 K must be guaranteed, which corresponds to a water flow
rate of 0.09 l/s per kW.
10.6 - Water loop volume
10.6.1 - Minimum water loop volume
The minimum water loop volume, in litres, is given by the
following formula:
Volume (l) = CAP (kW) x N, where CAP is the nominal
cooling capacity at nominal operating conditions.
Application
Air conditioning
Industrial process cooling
*
For sizes 039 to 120, N can be increased up to 4 depending on the size of the
hot-water loop to prevent a water temperature drop during the defrost cycle.
NOTE: For industrial process cooling applications, where high stability of the water
temperature levels must be achieved, the values above must be increased.
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.
For the Buffer Tank Module option, the tank volume must
be taken into account: 250 litres.
Bad
Bad
30
Maximum dual pump**
Low pressure***
High pressure***
2.9
3.4
3.2
3.8
3.7
4.4
4.1
5.0
4.1
5.0
4.4
5.2
5.1
6.2
5.1
6.2
6.3
6.5
6.5
8.0
7.9
8.7
8.2
8.9
N
2.5*
(See note)
Good
Good
10.6.2 - 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.
039-078 without buffer
30RQS/RQSY
tank
Static pressure
bar
1
Pure water
litres 597
10% ethylene glycol l
471
20% ethylene glycol l
389
30% ethylene glycol l
348
40% ethylene glycol l
289
039-078 with buffer
30RQS/RQSY
tank
Static pressure
bar
1
Pure water
litres 896
10% ethylene glycol l
706
20% ethylene glycol l
584
30% ethylene glycol l
522
40% ethylene glycol l
434
If the total system volume is higher than the values given
above, the installer must add another expansion tank, suitable
for the additional volume.
Note : Take into account the buffer tank volume (250 litres)
11 - ELECTRICAL CONNECTION
11.1 - Control box
Please refer to the certified dimensional drawings, supplied
with the unit.
11.2 - Power supply
The power supply must conform to the specification on the
heat pump nameplate. The supply voltage must be within the
range specified in the electrical data table. For connec-tions
refer to the wiring diagrams and the certified dimen-sional
drawings.
WARNING: Operation of the heat pump with an improper
supply voltage or excessive phase imbalance constitutes
abuse which will invalidate the Carrier warranty. If the
phase imbalance exceeds 2% for voltage, or 10% for current,
contact your local electricity supply at once and ensure that
the heat pump is not switched on until correc-tive measures
have been taken.
11.3 - Voltage phase imbalance (%)
100 x max. deviation from average voltage
Average voltage
Example:
On a 400 V - 3 ph - 50 Hz supply, the individual phase voltages
were measured to be:
AB = 406 V; BC = 399 V; AC = 394 V
Average voltage = (406 + 399 + 394)/3 = 1199/3
= 399.7 say 400 V
Calculate the maximum deviation from the 400 V average:
(AB) = 406 - 400 = 6
080-160 without buffer
tank
2
3
1
2
398
199
1741
1161
915
314
157
1373
259
130
1135
757
232
116
1014
676
193
96
843
562
080-160 with buffer
tank
2
3
1
2
597
299
1741
1161
915
471
235
1373
389
195
1135
757
348
174
1014
676
289
843
145
562
3
580
458
378
338
281
3
580
458
378
338
281
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