Carrier 30XW - Standard and Optional Number of Water Passes; Evaporator and Condenser Water Flow Rates; Variable Flow Evaporator; System Minimum Water Volume

19

Variable evaporator ow can be used. The controlled ow
rate must be higher than the minimum ow given in the
table of permissible ow rates and must not vary by more
than 10% per minute.
If the ow rate changes more rapidly, the system should
contain a minimum of 6.5 litres of water per kW instead of
3.25 l/kW.
It is possible to use a dedicated terminal to connect the
pump drive (0/10V signal) .
Please refer to 30XB/30XA/XAS/XW/XWZE Touch Pilot
control manual.

Whichever the system, the water loop minimum volume is
given by the formula: Volume = Cap (kW) x N litres
 
Normal air conditioning 3.25
Process type cooling 6.5
Where Cap is the nominal system cooling capacity (kW) at
the 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 bafed in order to ensure proper mixing
of the liquid (water or brine). Refer to the examples below.



 254 304 354 402 452 552 602 652 702 802 852 1002 1052 1154 1252 1352 1452 1552 1652 1702

Standard 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2
Option 100C 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1

Standard 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2
Option 102C 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1

 512 562 712 812 862 1012 1162 1314 1464 1612 1762

Standard 2 2 2 2 2 2 2 2 2 2 2
Option 100C 1 1 1 1 1 1 1 1 1 1 1

Standard 2 2 2 2 2 2 2 2 2 2 2
Option 102C 1 1 1 1 1 1 1 1 1 1 1

These below values are given for standard units. For options 100C and 102C, please refer to the unit selection program.

 254 304 354 402 452 552 602 652 702 802 852 1002 1052 1154 1252 1352 1452 1552 1652 1702

Minimum 6 6 6 7 7 7 7 9 9 9 9 13 13 15 18 18 18 18 22 22
Maximum 39 39 39 39 43 43 43 57 57 57 61 67 67 78 84 84 84 84 116 116

Minimum 4 4 4 4 4 4 4 6 6 6 8 8 8 9 12 12 12 12 14 14
Maximum 29 29 29 29 47 47 47 55 55 55 82 82 82 109 119 119 119 119 134 134

 512 562 712 812 862 1012 1162 1314 1464 1612 1762

Minimum 10 10 13 13 13 18 18 22 22 28 28
Maximum 57 57 76 76 76 84 84 116 116 121 121

Minimum 6 6 8 8 8 12 12 18 18 22 22
Maximum 55 55 74 74 74 119 119 130 130 149 149

-Minimumevaporatorowratebasedonawatervelocityof0,5m/s.
-Minimumcondenserowratebasedonawatervelocityof0,3m/s.
-Maximumowratebasedonapressuredropof120kPa(unitswithtwoevaporatorpassesandtwocondenserpasses).
Bad
Bad
Good
Good