Daikin EWAQ016CAW - Connecting the Water Piping; Precautions When Connecting the Water Piping; To Fill the Water Circuit; To Protect the Water Circuit against Freezing

5 Installation
Installation and operation manual
10
EWAQ016~064CAW + EWYQ016~064CAW
Packaged air-cooled water chiller
4P489435-1B – 2017.10
NOTICE
▪ Prepare a water drainage channel around the
foundation to drain waste water from around the unit.
During heating operation and when the outdoor
temperatures are negative, the drained water from the
outdoor unit will freeze up. If the water drainage is not
taken care of, the area around the unit might be very
slippery.
▪ When installed in a corrosive environment, use a nut
with plastic washer (a) to protect the nut tightening part
from rust.
a
5.3 Connecting the water piping
5.3.1 Precautions when connecting the water
piping
INFORMATION
Also read the precautions and requirements in the
following chapters:
▪ General safety precautions
▪ Preparation
To connect the water piping
Water connections must be made in accordance with all applicable
legislations and the outlook drawing delivered with the unit,
respecting the water inlet and outlet.
NOTICE
Do NOT use excessive force when connecting the piping.
Deformation of the piping can cause malfunctioning of the
unit.
If dirt gets in the water circuit, problems may occur. Therefore,
always take into account the following when connecting the water
circuit:
▪ Use clean pipes only.
▪ Hold the pipe end downwards when removing burrs.
▪ Cover the pipe end when inserting it through a wall so that no dust
and dirt enter.
▪ Use a good thread sealant for the sealing of the connections. The
sealing must be able to withstand the pressures and temperatures
of the system; it must also be resistant to the used glycol in the
water.
▪ When using non-brass metallic piping, make sure to insulate both
materials from each other to prevent galvanic corrosion.
▪ Make sure to provide a proper drain for the pressure relief valve.
▪ Because brass is a soft material, use appropriate tooling for
connecting the water circuit. Inappropriate tooling will cause
damage to the pipes.
▪ 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).
5.3.2 To fill the water circuit
1 Connect the water supply to the drain and fill valve.
2 Make sure the automatic air purge valve is open (at least 2
turns).
3 Fill with water until the pressure gauge indicates a pressure of
approximately 2.0 bar. Remove air in the circuit as much as
possible using the air purge valves (refer to field setting[E‑04]
in "6.2.9Field settings on the remote controller"on page16).
NOTICE
▪ Air in the water circuit can cause malfunctioning. During
filling, it may not be possible to remove all the air from
the circuit. Remaining air will be removed through the
automatic air purge valves during the initial operating
hours of the system. Additional filling with water
afterwards may be required.
▪ To purge the system, use the special function as
described in "7Commissioning"on page21.
NOTICE
The water pressure indicated on the manometer will vary
depending on the water temperature (higher pressure at
higher water temperature).
However, at all times water pressure shall remain above
1bar to avoid air entering the circuit.
NOTICE
Make sure water quality complies with EU directive
98/83EC.
INFORMATION
The unit may dispose of some excessive water through the
pressure relief valve.
NOTICE
In case of a power supply failure or pump failure, and NO
glycol was added to the system, drain the system. When
water is at standstill inside the system, the system is very
likely to freeze and get damaged.
5.3.3 To protect the water circuit against
freezing
Frost can damage the system. For this reason, if negative ambient
temperatures are expected, make sure the water circuit is sufficiently
protected against freezing.
Heater tape (optional)
A heater tape is wound around the piping to protect vital parts of the
hydraulic system inside the unit.
This heater tape will only protect internal parts of the unit. It can not
protect field installed parts outside the unit.
Field heater tapes must be provided by the installer.
NOTICE
In case of a power failure or if the power supply is
disconnected during winter, the optional heater tape
cannot protect the unit from freezing. If a power failure can
happen at times the unit is unattended, if the power supply
is disconnected during winter, or if you did not select this
option, it is recommended to add glycol to the water
system.