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9.3.3 Water circuit connection
Water connections must be made correctly in
accordance with labels on the outdoor unit, with
respect to the water inlet and water outlet.
CAUTION
Be careful not to deform the unit's piping
by
using
excessive
connecting the piping. Deforming the
piping can cause the unit to malfunction.
If air, moisture or dust gets in the water circuit,
problems may occur. Therefore, always take into
account the following when connecting the water
circuit:
Use clean pipes only.
Hold the pipe end downwards when removing
burrs.
Cover the pipe end when inserting it through a
wall to prevent dust and dirt entering.
Use a good thread sealant for sealing the connec-
tions. The sealing must be able to withstand the
pressures and temperatures of the system.
When using non-copper metallic piping, be sure
insulate two kind of materials from each other to
prevent galvanic corrosion.
For copper is a soft material,
use appropriate tools for
connecting the water circuit.
Inappropriate tools will cause
damage to the pipes.
NOTE
The unit is only to be used in a closed water
system. Application in an open water circuit
can lead to excessive corrosion of the water
piping:
Never use Zn-coated parts in the water
circuit. Excessive corrosion of these parts
may occur as copper piping is used in the
unit's internal water circuit.
When using a 3-way valve in the water
circuit. Preferably choose a ball type 3-way
valve to guarantee full separation between
the domestic hot water and floor heating
water circuit.
When using a 3-way valve or a 2-way valve
in the water circuit. The recommended
maximum changeover time of the valve
should be less than 60 seconds.
9.3.4 Water circuit anti-freeze protection
All internal hydronic parts are insulated to reduce
heat loss. Insulation must also be added to the field
piping.
In event of a power failure, the above features would
not protect the unit from freezing.
The software contains special functions using the heat
pump and backup heater (if optional and aviliable) to
protect the entire system against freezing. When the
temperature of the water flow in the system drops to a
certain value, the unit will heat the water, either using
the heat pump, the electric heating tap, or the backup
heater. The anti-freeze function will turn off only when
the
temperature
increases
Water may enter into the flow switch and cannot be
drained out and may freeze when the temperature is
low enough. The flow switch should be removed and
dried, then can be installed in the unit.
force
when
to
a
certain
value.
25
NOTE
Rotate the flow switch counterclockwise to
remove it.
Dry the flow switch completely.
CAUTION
When the unit is not running for a long time, make
sure the unit is powered on all the time. If you want
to cut off the power, the water in the system needs
to be drained clean to avoid the unit and piping
system be damaged by freezing. Also the power of
the unit needs to be cut off after water in the
system is drained off.
WARNING
Ethylene Glycol and Propylene Glycol are TOXIC.
9.4 Filling water
Connect the water supply to the filling valve and
open the valve.
Make sure the automatic air purge valve is open.
Fill with water pressure of approximately 2.0 bar.
Remove air in the circuit as much as possible using
the air purge valves. Air in the water circuit could lead
to malfunction of the backup electric heater.
Do not fasten the black plas-
tic cover on the vent valve at
the topside of the unit when
the system is running. Open
air purge valve, turn anti-
clockwise at least 2 full turns
to release air from the system.
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 the
first operating hours of the system. Topping up the
water afterwards might be required.
The water pressure 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 drain-off too much water through
the pressure relief valve.
Water quality should be complied with EN 98/83
EC Directives.
Detailed water quality condition can be found in
EN 98/83 EC Directives.
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