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11 Use the screws and washers (x2) to fix the EPP casing. Screw
until tight position.
NOTE
Do not switch inlet and outlet connections.
Refer to the chapter "Typical application examples" described in the
installation manual delivered with the indoor unit for details on
connecting the water circuits and the motorised 3-way valve.
CAUTION
To install adequate connections between the indoor
unit and the solar kit, it is important that the 3-way
valve is fitted correctly.
Ensure that the water piping connected to the solar kit
coming from the solar panel and the indoor unit are
sufficiently supported and do not cause any stress on
the solar kit.
Charging water
Charge the water on the indoor unit and the tank (refer to the
installation manuals of the indoor unit and the domestic hot water
tank).
Charge the solar panel circuit with a glycol solution.
Observe the instructions as given by your solar panel
supplier. Make sure to use non-toxic glycol.
WARNING
ETHYLENE GLYCOL IS TOXIC
Caution: "Use of glycol"
Caution: Use of glycol
Use only propylene glycol having a toxicity rating or
class of 1, as listed in "Clinical Toxicology of
Commercial Products, 5th edition" may be used.
In case of over-pressure, be sure to connect the
safety valve to a drain 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;
only the use of propylene glycol is allowed.
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.
Installation and operation manual
8
Field wiring
WARNING
Switch off the power supply (outdoor unit power
supply, backup heater, and booster heater power
supply) before making any connections.
All field wiring and components must be installed by a
licensed electrician and must comply with local laws
and regulations.
The field wiring must be carried out in accordance
with the wiring diagram and the instructions given
below.
Use only copper wires.
Never squeeze bundled cables and make sure that it
does not come in contact with the piping and sharp
edges.
Make sure no external pressure is applied to the
terminal connections.
Be sure to install the required fuses or circuit
breakers.
After finishing the electrical work, confirm that each
electric part and terminal inside the electric part box is
connected securely.
CAUTION
Select all cables and wire sizes in accordance with relevant
local laws and regulations.
Overview
The illustration below gives an overview of the required field wiring
between several parts of the installation. Refer also the wiring
diagram, the installation manual of the indoor unit and the domestic
hot water tank.
C
B
2
D
1
12
3
A 9
J
10
K
A...I
Refer to the indoor unit installation manual
J
Solar panel
K
Solar pump station
L
Solar kit
Item
Description
1 ... 9
Refer to the installation manual of the indoor unit
10
Solar panel sensor cable
(Field supply with solar
pump station)
11
Domestic hot water
temperature sensor of the
solar pump station
(Field supply)
T
4
E
5
M
6
M
13
7
14
11
8
L
Maximum
Required number of
running
conductors
current
2
—
2
—
EKSOLHWAVJU
Solar kit for air to water heat pump system
4PW54234-1
F
G
H
I
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