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6 Preparation
65°C
a
b
c
d
e
d
a
Outdoor unit
b
Heat exchanger
c
Pump
d
Shut‑off valve
e
Backup heater
f
Motorised 2‑way valve (field supply)
g
Collector
FCU1...3
Fan coil unit (optional) (field supply)
FHL1...3
Floor heating loop (field supply)
▪ Drainage – Low points. Provide drain taps at all low points of the
system in order to allow complete drainage of the water circuit.
▪ Drainage – Pressure relief valve. Provide a proper drain for the
pressure relief valve to avoid water coming into contact with
electrical parts.
▪ Air vents. Provide air vents at all high points of the system, which
must also be easily accessible for servicing. The outdoor unit has
a manual air purge valve. The backup heater (option) has an
automatic air purge valve. Check that automatic air purge valves
are NOT tightened too much, so that the automatic release of air
from the water circuit is possible.
▪ Zn-coated parts. Never use Zn-coated parts in the water circuit.
Because the unit's internal water circuit uses copper piping,
excessive corrosion may occur.
▪ Non-brass metallic piping. When using non-brass metallic
piping, insulate the brass and non-brass properly so that they do
NOT make contact with each other. This to prevent galvanic
corrosion.
▪ Valve – Change‑over time. When using a 2-way valve or a 3-way
valve in the water circuit, the maximum change-over time of the
valve must be 60 seconds.
▪ Filter. It is strongly recommended to install an additional filter on
the heating water circuit. Especially to remove metallic particles
from foul heating piping, it is recommended to use a magnetic or
cyclone filter, which can remove small particles. Small particles
may damage the unit and will NOT be removed by the standard
filter of the heat pump system.
▪ Thermostatic mixing valves. In accordance with the applicable
legislation, it may be necessary to install thermostatic mixing
valves.
▪ Hygienic measures. The installation must be in compliance with
the applicable legislation and may require additional hygienic
installation measures.
6.3.2
Formula to calculate the expansion vessel
pre-pressure
The pre-pressure (Pg) of the vessel depends on the installation
height difference (H):
Pg=0.3+(H/10) (bar)
Installer reference guide
24
g
6.3.3
The outdoor unit has an expansion vessel of 3 litre with a factory-set
g
pre-pressure of 1 bar.
To make sure that the unit operates properly:
▪ You must check the minimum and maximum water volume.
f
FCU1
▪ You might need to adjust the pre-pressure of the expansion
FCU2
FCU3
g
M
Minimum water volume
g
The system contains a backup
heater
The system does NOT contain a
FHL1
FHL2
backup heater
FHL3
Maximum water volume
Use the following graph to determine the maximum water volume for
the calculated pre-pressure.
To check the water volume and flow rate
vessel.
If
(a)
The internal water volume of the outdoor unit NOT
included.
INFORMATION
In critical processes, or in rooms with a high heat load,
extra water might be required.
NOTICE
When circulation in each space heating/cooling loop is
controlled by remotely controlled valves, it is important that
the minimum water volume is guaranteed, even if all of the
valves are closed.
a
b
c
d
e
d
a
Outdoor unit
b
Heat exchanger
c
Pump
d
Shut‑off valve
e
Backup heater kit (optional)
f
Collector (field supply)
g
By‑pass valve (field supply)
FHL1...3
Floor heating loop (field supply)
T1...3
Individual room thermostat (optional)
M1...3
Individual motorised valve to control loop FHL1...3 (field
supply)
NOTICE
The maximum water volume depends on whether glycol is
added to the water circuit. For more information on the
addition of glycol, refer to
against freezing" on
page 35.
Packaged air-cooled water chillers and packaged air to water heat
Then
The minimum water volume is
(a)
10 l
The minimum water volume is
(a)
20 l
f
g
T1
T2
T3
M1
M2
M3
FHL1
FHL2
FHL3
"7.7.6 To protect the water circuit
EWAQ+EWYQ004+005BAVP
pumps
4P492900-1 – 2017.06
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