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6 Preparation
6.2.4 Changing the pre-pressure of the expansion
vessel
NOTICE
Only a licensed installer may adjust the pre-pressure of the
expansion vessel.
When changing the default pre-pressure of the expansion vessel
(1 bar) is required, take following guidelines into account:
Only use dry nitrogen to set the expansion vessel pre-pressure.
Inappropriate setting of the expansion vessel pre-pressure will
lead to malfunction of the system.
Changing the pre-pressure of the expansion vessel should be done
by releasing or increasing nitrogen pressure through the schräder
valve of the expansion vessel.
a
a Schräder valve
6.2.5 To check the water volume: Examples
Example 1
The indoor unit is installed 5 m below the highest point in the water
circuit. The total water volume in the water circuit is 100 l.
No actions or adjustments are required.
Example 2
The indoor unit is installed at the highest point in the water circuit.
The total water volume in the water circuit is 350 l.
Actions:
Because the total water volume (350 l) is more than the default
water volume (280 l), the pre-pressure must be decreased.
The required pre-pressure is:
Pg = (0.3+(H/10)) bar = (0.3+(0/10)) bar=0.3 bar.
The corresponding maximum water volume at 0.3 bar is 410 l.
(See the graph in the chapter above).
Because 350 l is lower than 410 l, the expansion vessel is
appropriate for the installation.
Installer reference guide
21
6.3
Preparing electrical wiring
6.3.1 About preparing electrical wiring
WARNING
If the power supply has a missing or wrong N-phase,
equipment will break down.
Establish proper earthing. Do NOT earth the unit to a
utility pipe, surge absorber, or telephone earth.
Incomplete earthing may cause electrical shock.
Install the required fuses or circuit breakers.
Secure the electrical wiring with cable ties so that the
cables do NOT come in contact with the piping or
sharp edges, particularly on the high-pressure side
Do NOT use taped wires, stranded conductor wires,
extension cords, or connections from a star system.
They can cause overheating, electrical shock or fire.
Do NOT install a phase advancing capacitor, because
this unit is equipped with an inverter. A phase
advancing capacitor will reduce performance and may
cause accidents.
WARNING
All wiring must be performed by an authorized
electrician and must comply with the applicable
legislation.
Make electrical connections to the fixed wiring.
All components procured on the site and all electrical
construction
must
legislation.
WARNING
The backup heater should have a dedicated power supply.
6.3.2 About preferential kWh rate power supply
Electricity companies throughout the world work hard to provide
reliable electric service at competitive prices and are often authorized
to bill clients at benefit rates. E.g. time-of-use rates, seasonal rates,
Wärmepumpentarif in Germany and Austria, ...
This equipment allows for connection to such preferential kWh rate
power supply delivery systems.
Consult with the electricity company acting as provider at the site
where this equipment is to be installed to know whether it is
appropriate to connect the equipment in one of the preferential kWh
rate power supply delivery systems available, if any.
When the equipment is connected to such preferential kWh rate
power supply, the electricity company is allowed to:
interrupt power supply to the equipment for certain periods of
time;
demand that the equipment only consumes a limited amount of
electricity during certain periods of time.
The indoor unit is designed to receive an input signal by which the
unit switches into forced off mode. At that moment, the outdoor unit
compressor will not operate.
Whether the power supply is interrupted or not, the wiring to the unit
is different.
comply
with
the
applicable
EHBH/X16
Daikin Altherma - Low Temperature Split
4P313776-1 – 2012.05
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