Charging Water; Piping Insulation; Field Wiring - Rotex RDLQ011AA6V3 Mode D'emploi

Protecting the water circuit against freezing
Frost can damage the unit. For this reason, in colder climates the
water circuit can be protected by means of adding glycol to the water.
However, this unit is by default already foreseen with a freeze-up
protection function. Refer to paragraph "[4-04] Freeze-up protection
function" on page 23.
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 Ethylene glycol
–5°C
–10°C
–15°C
–25°C
WARNING
(a)
Use of ethylene glycol is not allowed for installations
with a domestic hot water tank.
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.
NOTE Be aware of the hygroscopic property of glycol: it
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 20.
R(D/B)LQ011~016AA6V3+W1
Unit for air to water heat pump system
4PW53149-1
(a)
Propylene glycol
10% 15%
25% 25%
35% 35%
45% 45%

Charging water

1 Connect the water supply to a drain and fill valve (see "Main
components" on page 8).
2 Make sure the automatic air purge valve is open (at least 2
turns).
3 Fill with water until the manometer indicates a pressure of
approximately 2.0 bar. Remove air in the circuit as much as
possible using the air purge valves. Air present in the water
circuit might cause malfunctioning of the backup heater.
4 Check that the backup heater vessel is filled with water by
opening the pressure relief valve. Water must flow out of the
valve.
NOTE 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 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 EN directive
98/83 EC.

Piping insulation

The complete water circuit, inclusive all piping, must be insulated to
prevent condensation during cooling operation and reduction of the
cooling and heating capacity as well as prevention of freezing of the
outside water piping during winter time. The thickness of the sealing
materials must be at least 13 mm with λ = 0.036 W/mK in order to
prevent freezing on the outside water piping.
If the temperature is higher than 30°C and the humidity is higher than
RH 80%, then the thickness of the sealing materials should be at
least 20 mm in order to avoid condensation on the surface of the
sealing.

Field wiring

WARNING
A main switch or other means for disconnection,
having a contact separation in all poles, must be
incorporated in the fixed wiring in accordance with
relevant local and national legislation.
Switch off the power supply before making any
connections.
All field wiring and components must be installed by a
licensed electrician and must comply with relevant
European and national regulations.
The field wiring must be carried out in accordance
with the wiring diagram supplied with the unit and the
instructions given below.
Be sure to use a dedicated power supply. Never use a
power supply shared by another appliance.
Be sure to establish an earth. Do not earth the unit to
a utility pipe, surge absorber, or telephone earth.
Incomplete earth may cause electrical shock.
Be sure to install an earth leakage protector (30 mA).
Failure to do so may cause electrical shock.
Installation manual
12