Carrier 30WG 080 - Minimum Water Volume; Maximum Water Loop Volume (Evaporator and Condenser Side); Expansion Tank

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5.10.3 - Standard 30WG/30WGA
30WG
30WGA
Evaporator water ow rate, l/s
Minimum* Minimum** Maximum*** Maximum****
Low
pressure
High
pressure
Low
pressure
High
pressure
020 1.0 0.9 0.5 3.1 3.6 3.8
025 1.0 1.0 0.5 3.3 3.8 4.1
030 1.0 1.0 0.5 3.3 3.8 4.1
035 1.1 1.1 0.6 3.6 4.2 4.7
040 1.1 1.1 0.6 3.8 4.4 5
045 1.2 1.1 0.8 4.0 4.6 5.4
050 1.6 1.4 0.8 5.4 7.8 9.2
060 1.5 1.6 1.0 6.1 8.0 9.9
070 1.6 1.5 1.1 6.2 8.1 10.3
080 1.6 1.5 1.3 6.3 8.3 10.9
090 2.0 1.6 1.5 7.8 8.7 12.5
* Units with hydronic module
Flow rate for a maximum permitted temperature difference at the minimum
leaving water temperature
** Units without hydronic module
Flow rate for a maximum permitted temperature difference at the minimum
leaving water temperature
*** Units with hydronic module
 Maximumowrateforanavailablepressureof20kPa(unitwithlow-pressure
hydronic module) or 50 kPa (unit with high-pressure hydronic module)
**** Units without hydronic module
 Maximumowrateforapressuredropof100kPaintheplateheatexchanger.
30WG Condenser water ow rate, l/s
Minimum* Maximum** Maximum***
Low pressure Low pressure High pressure
020 0.3 3.1 3.5 3.8
025 0.3 3.3 3.8 4.1
030 0.3 3.3 3.8 4.1
035 0.4 3.5 4.1 4.7
040 0.4 3.7 4.3 5.0
045 0.4 3.9 4.5 5.4
050 0.4 4.8 6.8 7.0
060 0.5 5.5 7.0 7.5
070 0.5 5.6 7.2 7.8
080 0.6 5.8 7.4 8.2
090 0.6 7.2 7.9 9.3
* Units with or without hydronic module
 Minimumowrateforawatertemperaturedifferenceof18K-
 Note:Operationpermitteduptoavalueof20K.
** Units with hydronic module
 Maximumowrateforanavailablepressureof20kPa(unitwithlow-pressure
hydronic module) or 50 kPa (unit with high-pressure hydronic module)
*** Units without hydronic module
 Maximumowrateforapressuredropof100kPaintheplateheatexchanger
5.10.4 - 30WG with option 6
30WG Minimum evaporator glycol solution ow rate - option 6*, l/s
Minimum** Minimum***
Low pressure High pressure
020 1.4 1.3 0.5
025 1.5 1.3 0.5
030 1.5 1.3 0.5
035 1.6 1.5 0.6
040 1.7 1.5 0.6
045 1.8 1.5 0.8
050 2.5 2.2 0.8
060 2.2 2.3 1.0
070 2.2 2.4 1.1
080 2.3 2.4 1.3
090 2.5 2.5 1.5
* Option 6: Glycol solution production, very low temperature
** Units with hydronic module
 Minimum ow rate for a maximum permitted temperature difference at the
minimum leaving water temperature
*** Units without hydronic module
 Minimum ow rate for a maximum permitted temperature difference at the
minimum leaving water temperature
5.11 - Minimum water volume
Whichever the system, the water loop minimum capacity is
given by the formula: Capacity = Cap (kW) x N Liters
Cap is the nominal system cooling capacity (kW) at the
nominal system operating conditions. This volume is neces-sary
for stable operation and accurate temperature control.
Application N
61WG/30WG/30WGA 2.5
ATTENTION: Minimum water volume required between
the unit and possible customer-supplied valves to the outside
of the unit.
Industrial process applications
Certain industrial processes may require high leaving water
stability. In these cases the values above must be increased.
It may be 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.
Bad
Bad
Good
Good
5.12 - Maximum water loop volume (evaporator and
condenser side)
Units with hydronic module incorporate an expansion tank
sized for the maximum water loop volume. The table below
gives the maximum water loop volume (in litres) for pure
water or ethylene glycol with various concentrations.
61WG/30WG/30WGA 020-045 060-090
Static pressure kPa 100 200 300 100 200 300
bar 1 2 3 1 2 3
Pure water l 220 450 75 340 225 115
10% ethylene glycol l 165 110 53 255 170 85
20% ethylene glycol l 100 70 35 150 100 50
35%ethyleneglycol l 85 55 30 130 85 45
5.13 - Expansion tank
The expansion tank is supplied with a pressure of 1 bar
relative (±20%). The maximum operating pressure for the
tank is 3 bar.