Standard And Optional Number Of Water Passes; Evaporator And Condenser Water Flow Rates; Variable Flow Evaporator; System Minimum Water Volume - Carrier AquaForce PUREtec 30XW-VZE 451 Installation, Operation And Maintenance Instructions
Water-cooled and heat pump variable speed liquid chillers greenspeed with r1234ze(e) or optionally with r515b refrigerant
Table of Contents
Advertisement
6 - APPLICATION DATA
6.6 - Standard and optional number of water
passes
30XW-
451 501 601 651 851 1001 1101 1201 1301
VZE/30XWHVZE
Evaporator
Standard
2
2
Option 100C
1
1
Condenser
Standard
2
2
Option 102C
1
1
6.7 - Evaporator and condenser water flow
rates
These below values are given for standard units. For options 100C
and 102C, please refer to the unit selection program.
30XW-
451
501
601
V/30XWHV
Evaporator water flow rate, l/s
Minimum
6
6
8
Maximum
54
54
76
Condenser water flow rate, l/s
Minimum
6
6
8
Maximum
52
52
74
Notes
- Minimum evaporator flow rate based on a water velocity
of 0,3 m/s.
- Minimum condenser flow rate based on a water velocity
of 0,3 m/s.
6.8 - Variable flow evaporator
Variable evaporator flow can be used. The pump drive can be
managed by unit control (0/10V output on terminal 90+ / 90-). The
controlled flow rate must be higher than the minimum flow given
in the table of permissible flow rates and must not vary by more
than 10% per minute.
If the flow rate changes more rapidly, the system should contain
a minimum of 6.5 liters of water per kW instead of 3.25 l/kW.
18
2
2
2
2
2
2
1
1
1
1
1
1
2
2
2
2
2
2
1
1
1
1
1
1
651
851 1001 1101 1201 1301
8
15
15
15
15
76
170
170
170
170
8
15
15
15
15
74
170
170
170
170
6.9 - System minimum water volume
Whichever the system, the water loop minimum volume is given
by the formula:
Volume = Cap (kW) x N litres
Application
2
1
Normal air conditioning
Process type cooling
2
Where Cap is the nominal system cooling capacity (kW) at the
1
nominal operating conditions of the installation.
This volume is necessary for stable operation. It is often necessary
to add a buffer water tank to the circuit in order to achieve the
required volume. The tank must itself be internally baffled in order
to ensure proper mixing of the liquid (water or brine). Refer to the
examples below.
Conection to buffer tank
15
170
15
170
Bad
Good
Bad
Good
N
3,25
6,5
Advertisement
Table of Contents
