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6. For units in double circuit configuration with common leaving water control (ELWT), be sure to foresee an
insertion hole for the additional water temperature sensor. Sensor and sensor holder are optional parts.
7.
The insertion hole shall be 1/4” GAS female thread and should be located in the mixed waterflow of the chillers.
8. Make sure that the sensor tip is in the waterflow and that you have a length of straight pipe (L) of at least 10x the
pipe diameter (A) before the sensor.
Choose the position of insertion in a way that the cable length of the sensor (10 m) is long enough.
5.5.2
Piping insulation
The complete water circuit, inclusive all piping, must be insulated to prevent condensation and reduction of the cooling
capacity.
Protect the water piping against water freezing during winter period (e.g., by using a glycol solution or heater tape).
5.6
Water flow and quality
To assure proper operation of the unit, the water flow through the evaporator must be within the operation range as
specified in the table below and a minimum water volume is required in the system.
Model
Minimum water flow
[l/min]
Maximum water flow
[l/min]
EWWD120J - EWLD110J
EWWH090J
– EWLH080J
EWWS120J
– EWLS110J
168
671
EWWD140J - EWLD130J
EWWH110J
– EWLH100J
EWWS140J
– EWLS130J
195
780
EWWD150J - EWLD145J
EWWH120J
– EWLH110J
EWWS150J
– EWLS150J
221
883
EWWD180J - EWLD165J
EWWH130J
– EWLH130J
EWWS180J
– EWLS170J
255
1021
EWWD210J - EWLD195J
EWWH150J
– EWLH140J
EWWS210J
– EWLS200J
290
1158
EWWD250J - EWLD235J
EWWH180J
– EWLH170J
EWWS240J
– EWLS240J
357
1428
EWWD280J - EWLD265J
EWWH120J
– EWLH190J
EWWS270J
– EWLS270J
397
1588
The minimum water volume v [l] in the system must fulfil the criteria below:
𝑉 > (
𝑄
2
) × (
𝑇
𝐶 × ∆𝑇
)
Q
highest cooling capacity of the unit in lowest capacity step within the range of application (kW)
t
antirecycling timer of unit (AREC)/2(s) = 300 s
C
specific heat capacity of the fluidum (kJ/kg°C)=4,186 kJ/kg°C for water
∆T temperature difference between starting and stopping of the compressor:
∆T=a+2b+c
(for designation of a, b, and c, refer to the operation manual)
NOTE:
For units in a double circuit configuration, the minimum required water volume in the system must equal the biggest
required minimum volume of every individual chiller in the system.
