To Fill The Water Circuit - Daikin EWAQ004BAVP Installer's Reference Manual

7 Installation
NOTICE
▪ It is the responsibility of the installer to add the correct
glycol percentage, depending on the expected ambient
temperatures.
▪ The addition of glycol applies to BOTH cooling‑only
models (EWAQ004+005BAVP) AND reversible models
(EWYQ004+005BAVP), and is independent of cooling
or heating operation.
▪ The required concentration might differ depending on
the type of glycol. ALWAYS compare the requirements
from the table above with the specifications provided by
the glycol manufacturer. If necessary, meet the
requirements set by the glycol manufacturer.
▪ The added concentration of glycol should NEVER
exceed 35%.
▪ If the liquid in the system is frozen, the pump will NOT
be able to start. Mind that if you only prevent the
system from bursting, the liquid inside might still freeze.
▪ 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.
The following types of glycol are allowed:
▪ Ethylene glycol;
▪ Propylene glycol, including the necessary inhibitors, classified as
Category III according to EN1717.
WARNING
Ethylene glycol is toxic.
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.
NOTICE
▪ If overpressure occurs, the system will release some of
the liquid through the pressure relief valve. If glycol was
added to the system, take adequate measures so as to
safely recover it.
▪ In any case, make sure that the flexible hose of the
pressure relief valve is ALWAYS free to release
pressure. Prevent water from staying and/or freezing
up inside the hose.
Installer reference guide
36
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.
Adding glycol to the water circuit reduces the maximum allowed
water volume of the system. For more information, refer to the
chapter "To check the water volume and flow rate" in the installer
reference guide.
7.7.7

To fill the water circuit

1 Connect the water supply hose to the drain and fill valve.
2 Open the drain and fill valve.
3 If an automatic air purge valve was installed, make sure it is
open.
4 Fill the circuit with water until the manometer (field supply)
indicates a pressure of ±2.0 bar.
5 Purge as much air as possible from the water circuit. For
instructions, see "9 Commissioning" on
6 Refill the circuit until the pressure is ±2.0 bar.
7 Repeat steps 5 and 6 until no more air is purged and there are
no more pressure drops.
8 Close the drain and fill valve.
9 Disconnect the water supply hose from the drain and fill valve.
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.
Packaged air-cooled water chillers and packaged air to water heat
page 66.
EWAQ+EWYQ004+005BAVP
pumps
4P492900-1 – 2017.06