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ENGLISH
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 plastic
cover on the vent valve at the
topside of the unit when the
system is running. Open air purge
valve, turn anticlockWise 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 val-
ves 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 tempera-
ture (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 Directi-
ves.
Detailed water quality condition can be found in EN 98/83 EC
Directives.
9.6 Water piping insulation
The complete water circuit including all piping, water 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. The insulation material should at least of B1 fire
resistance rating and complies with all applicable legislation.
The thickness of the sealing materials must be at least 13 mm
with thermal conductivity 0.039 W/mK in order to prevent free
-
zing on the outside water piping.
If the outdoor ambient 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 seal.
9.7 Field wiring
b
WARNING
A main switch or other means of disconnection, having a contact
separation in all poles, must be incorporated in the fixed wiring in
accordance with relevant local laws and regulations. Switch off the
power supply before making any connections. Use only copper wi-
res. Never squeeze bundled cables and make sure they do not come
in contact with the piping and sharp edges. Make sure no external
pressure is applied to the terminal connections. All field wiring and
components must be installed by a licensed electrician and must
comply with relevant local laws and 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 a ground. Do not ground the unit to a utility
pipe, surge protector, or telephone ground. Incomplete grounding
may cause electrical shock.
Be sure to install a ground fault circuit interrupter (30 mA). Failure to
do so may cause electrical shock.
Be sure to install the required fuses or circuit breakers.
9.7.1 Precautions on electrical wiring work
Fix cables so that cables do not make contact with the pipes
(especially on the high pressure side).
Secure the electrical wiring with cable ties as shown in figure
so that it does not come in contact with the piping, particularly
on the high-pressure side.
Make sure no external pressure is applied to the terminal con-
nectors.
When installing the ground fault circuit interrupter make sure
that it is compatible with the inverter (resistant to high fre
-
quency electrical noise) to avoid unnecessary opening of the
ground fault circuit interrupter.
NOTE
The ground fault circuit interrupter must be a high- speed type brea-
ker of 30 mA (<0.1 s).
This unit is equipped with an inverter. Installing a phase ad-
vancing capacitor not only will reduce the power factor impro-
vement effect, but also may cause abnormal heating of the
capacitor due to high-frequency waves. Never install a phase
advancing capacitor as it could lead to an accident.
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