Charging Water; Piping Insulation - Daikin EDLQ036BA6VJU1 Installation Manual

Depending on the expected lowest outdoor temperature, make sure
the water system is filled with a weight concentration of glycol as
mentioned in the table below.
Minimum outdoor temperature
23°F (–5°C)
14°F (–10°C)
5°F (–15°C)
–10°F (–20°C)
WARNING
ETHYLENE GLYCOL IS TOXIC
(a)
The concentrations mentioned in the table above will not
prevent the medium from freezing, but prevent the
hydraulics from bursting.
Caution: "Us e of glycol"
Caution: Use of glycol
■
Use of glycol for installations with a domestic hot
water tank:
- Only propylene glycol having a toxicity rating or
class of 1, as listed in "Clinical Toxicology of
Commercial Products, 5th edition" may be used.
- An approved pressure relief valve of 30 psi
(2.0 bar) must be installed at the inlet of the
domestic hot water tank heat exchanger.
The maximum allowed water volume is then reduced
according to the figure "Maximum allowed water
volume" on page 15.
Refer to the installation manual of the domestic hot
water tank for more information.
■ 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.
Corrosion of the system due to presence of glycol
Uninhibited glycol will turn acidic under the influence of
oxygen. This process is accelerated by presence of copper
and at higher temperatures. The acidic uninhibited glycol
attacks metal surfaces and forms galvanic corrosion cells
that cause severe damage to the system.
It is therefore of extreme importance:
■ that the water treatment is correctly executed by a
qualified water specialist;
■ that a glycol with corrosion inhibitors is selected to
counteract acids formed by the oxidation of glycols;
■ that in case of an installation with a domestic hot
water tank, only the use of propylene glycol is
allowed. In other installations the use of ethylene
glycol is permitted as well;
■ that no automotive glycol is used because their
corrosion inhibitors have a limited lifetime and contain
silicates which can foul or plug the system;
■ that galvanized piping is not used in glycol systems
since its presence may lead to the precipitation of
certain components in the glycol's corrosion inhibitor;
■ that it has to be made sure the glycol is compatible
with the used materials in the system.
Be aware of the hygroscopic property of glycol: it
NOTE
absorbs moisture from its environment.
Leaving the cap off the glycol container causes the
concentration of water to increase. The glycol
concentration is then lower than assumed. And in
consequence, freezing can happen after all.
Preventive actions must be taken to ensure minimal
exposure of the glycol to air.
Also refer to "Checks before initial start-up" on page 24.
Installation manual
16

Charging water

Connect the water supply to a drain and fill valve (see "Main
1
components" on page 12).
Glycol
(a)
10%
Make sure the automatic air purge valve is open (at least 2
2
turns).
15%
20%
Fill with water until the manometer indicates a pressure of
3
approximately 29 psi (2.0 bar). Remove air in the circuit as much
25%
as possible using the air purge valves. Air present in the water
circuit might cause malfunctioning of the backup heater.
Check that the backup heater vessel is filled with water by
4
opening the pressure relief valve. Water must flow out of the
valve.
NOTE

Piping insulation

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 sealing
materials
= 0.275 Btu-inch/hr sq ft
freezing on the outside water piping.
If the temperature is higher than 86°F (30°C) and the humidity is
higher than RH 80%, then the thickness of the sealing materials
should be at least 3/4 inch (20 mm) in order to avoid condensation on
the surface of the sealing.
During filling, it might not be possible to remove all
■
air in the system. Remaining air will be removed
through the automatic air purge valves during first
operating hours of the system. Additional filling
with water afterwards might be required.
■
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 should
remain above 43.5 psi (0.3 bar) to avoid air
entering the circuit.
■ The unit might dispose some excessive water
through the pressure relief valve.
■
Water quality must be according to "Safe Drinking
water Act (42 U.S.C. 300f)".
must be at least 1/2 inch
.°F (0.039 W/mK) in order to prevent
2
EDLQ036~054BA6VJU1 + EBLQ036~054BA6VJU1
Unit for air to water heat pump system
(13 mm) with
4PW56182-1