Daikin EWAQ016CAW, Installation And Operation Manual

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4 Preparation
Installation and operation manual
6
EWAQ016~ EWYQ016~064CAW
Packaged air-cooled water chiller
4P489435-1B – 2017.10
CAUTION
Appliance NOT accessible to the general public, install it in
a secured area, protected from easy access.
This unit is suitable for installation in a commercial and
light industrial environment.
4.2 Preparing water piping
4.2.1 Water circuit requirements
NOTICE
In case of plastic pipes, make sure they are fully oxygen
diffusion tight according to DIN 4726. The diffusion of
oxygen into the piping can lead to excessive corrosion.
▪ Connecting piping – Legislation. Make all piping connections in
accordance with the applicable legislation and the instructions in
the "Installation" chapter, respecting the water inlet and outlet.
▪ Connecting piping – Force. Do NOT use excessive force when
connecting the piping. Deformation of the piping can cause
malfunctioning of the unit.
▪ Connecting piping – Tools. Only use appropriate tooling to
handle brass, which is a soft material. If NOT, pipes will get
damaged.
▪ Connecting piping – Air, moisture, dust. If air, moisture or dust
gets into the circuit, problems may occur. To prevent this:
▪ Only use clean pipes
▪ Hold the pipe end downwards when removing burrs.
▪ Cover the pipe end when inserting it through a wall, to prevent
dust and/or particles entering the pipe.
▪ Use a decent thread sealant to seal connections.
NOTICE
If glycol is present in the system, make sure the thread
sealant used is resistant to glycol.
▪ Closed circuit. Use the outdoor unit ONLY in a closed water
system. Using the system in an open water system will lead to
excessive corrosion.
▪ Water flow. You can find the minimum required water flow in the
following table. In all cases, this flow needs to be guaranteed.
When the flow is lower, operation will stop and error
will be
displayed.
Capacity class Minimum required flow rate
016+021+025 23 l/min
032 36 l/min
040+050 46 l/min
064 72 l/min
▪ Field supply components – Water pressure and temperature.
Check that all components in the field piping can withstand the
water pressure and water temperature.
▪ Drainage – Low points. Provide drain taps at all low points of the
system in order to allow complete drainage of the water circuit.
▪ Non-brass metallic piping. When using non-brass metallic
piping, insulate the brass and non-brass properly so that they do
NOT make contact with each other. This to prevent galvanic
corrosion.
▪ Shut-off valves. Two shut-off valves are delivered with the unit.
Install them as shown in the following figure.
a
b
a
c
d
b
a Adapter piece (on the inlet only in case of EWAQ
+EWYQ040~064)
b Shut-off valve
c Bend
d Filter
NOTICE
Before mounting the bend, attach the filter to it.
NOTICE
If the bend is not used during installation, replace it with an
extension (5 cm long for a 1¼" filter, and 6 cm long for a
2" filter) to ensure proper cleaning operation of the filter.
NOTICE
Be sure to install the filter properly. Failure to install or
incorrect installation will damage the plate heat exchanger
permanently.
▪ Drain taps. Drain taps must be provided at all low points of the
system to permit complete drainage of the circuit. A drain valve is
provided inside the unit.
▪ Air vents. Provide air vents at all high points of the system, which
must also be easily accessible for servicing. An automatic air
purge valve is provided inside the unit. Check that this air purge
valve is NOT tightened too much, so that automatic release of air
from the water circuit is possible. Refer to field setting [E‑04] in
"6.2.9 Field settings on the remote controller" on page 16 .
WARNING
▪ For correct operation of the system, a regulating valve
must be installed in the water system. The regulating
valve is to be used to regulate the water flow in the
system (field supply).
▪ Selecting a flow outside the curves can cause
malfunction or damage to the unit. Also refer to the
Technical specifications.
▪ The maximum water piping temperature is 50°C according to
safety device setting.
▪ Always use materials which are compatible with the water used in
the system and with the materials used in the unit. (The unit piping
fittings are made of brass, the plate heat exchangers are made of
stainless steel 316 plates brazed together with copper and the
optional pump housing is made of cast iron.)
▪ Select the piping diameter in relation to the required water flow
and available external static pressure (ESP) of the pump. See the
following table for the recommended water piping diameter.
Capacity class Water piping diameter
016~032 1-1/4"