Changing The Pre-Pressure Of The Expansion Vessel; To Check The Water Volume: Examples; Preparing Electrical Wiring; About Preparing Electrical Wiring - Daikin Altherma ERLQ004-006-008CA Reference Manual

6 Preparation
Installation
height
≤280 l
(a)
difference
≤7 m No pre-pressure
adjustment is required.
>7 m Do the following:
▪ Increase the
pressure.
▪ Check if the water
volume does
exceed the maximum
allowed water volume.
(a) This is the height difference (m) between the highest point
of the water circuit and the indoor unit. If the indoor unit is
at the highest point of the installation, the installation height
is 0 m.
Minimum flow rate
Check that the minimum flow rate (required during defrost/backup
heater operation) in the installation is guaranteed in all conditions on
each zone separately.
NOTICE
When circulation in each or certain space heating loops is
controlled by remotely controlled valves, it is important that
the minimum flow rate is guaranteed, even if all valves are
closed. In case the minimum flow rate cannot be reached,
a flow error 7H will be generated (no heating/operation).
Minimum required flow rate during defrost/backup heater
operation
04+08 models
16 model
See the recommended procedure as described in
during commissioning" on page 59.
6.4.4 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.
Installer reference guide
20
Water volume
>280 l
Do the following:
▪ Decrease the pre-
pressure.
▪ Check if the water
volume does NOT
exceed the maximum
allowed water volume.
The expansion vessel of
the indoor unit is too
pre-
small for the installation.
In this case, it is
recommended to install
NOT
an extra vessel outside
the unit.
12 l/min
15 l/min
"9.4 Checklist
a Schräder valve
6.4.5

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.
6.5

Preparing electrical wiring

6.5.1

About preparing electrical wiring

INFORMATION
Also read the precautions and requirements in the
"General safety precautions" chapter.
WARNING
▪ If the power supply has a missing or wrong N-phase,
equipment might 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 sharp edges or
piping, 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.
a
ERLQ004~008CA + EHVZ04+08S18CB
Daikin Altherma – Low temperature split
4P401676-1 – 2015.02