25
10.3 - Water heat exchanger water flow rate
30RQS/
RQSY
flow rate, l/s
Minimum
Maximum*
Maximum dual pump**
low pressure*** High pressure***
039
0.9
3.0
2.9
3.4
045
0.9
3.4
3.2
3.8
050
0.9
4.2
3.7
4.4
060
0.9
5.0
4.1
5.0
070
1.0
5.0
4.1
5.0
078
1.2
5.5
4.4
5.2
080
1.2
6.8
5.1
6.2
090
1.3
6.8
5.1
6.2
100
1.5
7.7
6.3
6.5
120
1.7
8.5
6.5
8.0
140
2.0
10.6
7.9
8.7
160
2.3
11.2
8.2
8.9
* 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
N
air conditioning
2.5*
Industrial process cooling
(See note)
* 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.
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.
30RQS/RQSY
039-078
080-160
Static pressure
bar
1
2
3
1
2
3
pure water
litres 600
400
200
1680
1120
560
10% ethylene glycol
l
450
300
150
1260
840
420
20% ethylene glycol
l
330
220
110
930
620
310
30% ethylene glycol
l
270
180
90
750
500
250
40% ethylene glycol
l
225
150
75
630
420
210
If the total system volume is higher than the values given
above, the installer must add another expansion tank,
suitable for the additional volume.
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
(BC) = 400 - 399 = 1
(CA) = 400 - 394 = 6
The maximum deviation from the average is 6 V. The
greatest percentage deviation is: 100 x 6/400 = 1.5%
This is less than the permissible 2% and is therefore
acceptable.
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.
Bad
Good
Bad
Good
Motor
Summary of Contents for 30RQ 039 Series
Page 49: ......
