Water Charge, Flow And Quality; Piping Insulation - Daikin EWWD120J-SS Installations- Betriebs Und Wartungshandbuch

•
Connecting the counter pipes
Weld the supplied counter pipes to the ends of the water
circuit and connect to the unit with the provided Victaulic
couplings.
2. Drain taps must be provided at all low points of the
system to permit complete drainage of the circuit during
maintenance or in case of shut down. The drain plug is
provided to drain the condenser. When doing this, also
remove the air plugs (refer to the outlook diagram).
3. Air vent must be provided at all high points of the system.
The vents should be located at points which are easily
accessible for servicing.
4. Shut-off valves should be provided at the unit so that
normal servicing can be accomplished without draining
the system.
5. Vibration eliminators in all water piping connected to the
chiller are recommended to avoid straining the piping and
transmitting vibration and noise.
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.
The insertion hole shall be 1/4" GAS female thread and
should be located in the mixed waterflow of the chillers.
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.
12. WATER CHARGE, 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
EWWD120J - EWLD110J
EWWH090J – EWLH080J
EWWS120J – EWLS110J
EWWD140J - EWLD130J
EWWH110J – EWLH100J
EWWS140J – EWLS130J
EWWD150J - EWLD145J
EWWH120J – EWLH110J
EWWS150J – EWLS150J
EWWD180J - EWLD165J
EWWH130J – EWLH130J
EWWS180J – EWLS170J
EWWD210J - EWLD195J
EWWH150J – EWLH140J
EWWS210J – EWLS200J
EWWD250J - EWLD235J
EWWH180J – EWLH170J
EWWS240J – EWLS240J
EWWD280J - EWLD265J
EWWH120J – EWLH190J
EWWS270J – EWLS270J
Minimum water Maximum water
flow flow
[l/min] [l/min]
168 671
195 780
221 883
255 1021
290 1158
357 1428
397 1588
The minimum water volume v [l] in the system must fulfil the
criteria below:
®
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.
The water quality must be in accordance with the specifications
listed the table below:
DAE Water quality
requirements
pH at 25°C
Electrical conductivity at
25°C
[μS/m]
Chloride Ion
[mg Cl-/l]
Sulfate Ion
2
[mg SO -/l]
4
Alkalinity
[mg CaCO /l]
3
Total hardness
[mg CaCO /l]
3
Iron
[mg Fe/l]
Ammonium ion
[mg NH4+/l]
Silica
[mg SiO2 / l]
Chlorine molecular
[mg Cl2/l]
Note:
1. Heat Pump unit
2. Cooling Only unit
The water pressure should not exceed the maximum
working pressure of 10 bar.
NOTE Provide adequate safeguards in the water circuit
to make sure that the water pressure will never
exceed the maximum allowable working
pressure.

13. 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).
D - EIMWC01008-06_02EU - 14/182
v>(Q/2)xT/(Cx∆T)
Shell & tube Heat Brazed Plate Heat
Exchanger Exchanger
6.8 ÷ 8.4 6.8~8.0
< 800 < 500
< 70 (HP
< 150
< 300 (CO
< 100 < 100
< 100 < 200
< 200 75 ÷ 150
< 1
< 1
< 50
< 5
1
);
2
)
< 0.2
< 0.5
-
< 0.5