5 Installation
Installation and operation manual
11
EWAQ016~064CAW + EWYQ016~064CAW
Packaged air-cooled water chiller
4P489435-1B – 2017.10
Glycol
Refer to field setting [8‑04] in "6.2.9 Field settings on the remote
controller"on page16.
INFORMATION
The concentrations mentioned in the table below will
prevent the piping from bursting, but will not prevent the
liquid in the piping from freezing.
Depending on the expected lowest outdoor temperature, make sure
the water system is filled with a weight concentration of glycol as
mentioned in the following table.
Minimum outdoor
temperature
Ethylene glycol Propylene glycol
–5°C 10% 15%
–10°C 15% 20%
–15°C 20% 35%
WARNING
Ethylene glycol is toxic.
NOTICE
The above mentioned concentrations are applicable only
when the unit is at a standstill.
CAUTION
▪ In case of over-pressure when using glycol, be sure to
connect the safety valve to a drain pan in order to
recover the glycol. Connecting a drain pipe is not
required if no glycol is used. The discharged water is
then drained via the bottom of the unit.
▪ Using more than 40% glycol will damage the unit.
WARNING
Due to presence of glycol, corrosion of the system is
possible. Uninhibited glycol will turn acidic under the
influence of oxygen. This process is accelerated by the
presence of copper and high temperatures. The acidic
uninhibited glycol attacks metal surfaces and forms
galvanic corrosion cells that cause severe damage to the
system. Therefore it is important that:
▪ the water treatment is correctly executed by a qualified
water specialist,
▪ a glycol with corrosion inhibitors is selected to
counteract acids formed by the oxidation of glycols,
▪ no automotive glycol is used because their corrosion
inhibitors have a limited lifetime and contain silicates
which can foul or plug the system,
▪ galvanized pipes are NOT used in glycol systems since
the presence may lead to the precipitation of certain
components in the glycol's corrosion inhibitor.
NOTICE
Glycol absorbs water from its environment. Therefore do
NOT add glycol that has been exposed to air. Leaving the
cap off the glycol container causes the concentration of
water to increase. The glycol concentration is then lower
than assumed. As a result, the hydraulic components
might freeze up after all. Take preventive actions to ensure
a minimal exposure of the glycol to air.
See also "7.3Final check"on page22.
5.3.4 To insulate the water piping
The complete water circuit, inclusive all piping, must be insulated to
prevent condensation during cooling operation and reduction of the
heating and cooling capacity as well as prevention of freezing of the
outside water piping during winter time. The thickness of the
insulation materials must be at least 13mm with λ=0.039W/mK in
order to prevent freezing of the outside water piping at ambient
temperature of –15°C.
If the temperature is higher than 30°C and the humidity is higher
than RH80%, the thickness of the insulation materials should be at
least 20 mm to prevent condensation on the surface of the
insulation.
5.4 Connecting the electrical wiring
5.4.1 Field wiring: Overview
Field wiring consists of power supply (always including earth) and
indoor-outdoor communication (= transmission) wiring.
▪ Most field wiring on the unit is to be made on the terminal blocks
inside the electrical component boxes. To gain access to the
terminal blocks, remove the electrical component box service
panel. See "5.1Opening the units"on page8.
▪ Cable tie mountings are provided at the wiring entries of the
electrical component box.
The wiring diagram is delivered with the unit, located at the inside of
the switch box cover.
5.4.2 To route and fix the power supply
PS Power supply
HV High voltage
LV Low voltage
5.4.3 To install the main switch handle
Open panel 1 and mount the main switch handle parts. The handle
of the main switch is mounted on panel 1.
EWAQ+EWYQ016~032
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