To Check The Water Volume And Flow Rate - Daikin EBLQ011CA3V3 Installer's Reference Manual

6.3.3

To check the water volume and flow rate

The outdoor unit has an expansion vessel of 7 litre with a factory-set
pre-pressure of 1 bar.
To make sure that the unit operates properly:
▪ You must check the minimum and maximum water volume.
▪ You might need to adjust the pre-pressure of the expansion
vessel.
Minimum water volume
Check that the total water volume in the installation is minimum 20 l,
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.
The following illustration shows a setup with remotely controlled
valves:
a b e c d
d
a Outdoor unit
b Heat exchanger
c Pump
d Shut‑off valve
e Backup heater kit
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)
Maximum water volume
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 33.
Use the following graph to determine the maximum water volume for
the calculated pre-pressure.
A
2,4
2,1
1,8
1,5
1,2
1
0,9
0,6
0,3
20 70 120
105
A Pre-pressure (bar)
B Maximum water volume (l)
EBLQ+EDLQ011~016CA3V3+W1 + EK(2)CB07CAV3
Daikin Altherma low temperature monobloc
4P538847-1 – 2018.05
f g
T1 T2 T3
M1 M2 M3
FHL1
FHL2
FHL3
"7.6.4 To protect the water circuit
170 220 270
150 185
B
Water
Water + glycol
Example: Maximum water volume and expansion vessel pre-
pressure
Installation
height
≤185/105 l
(a)
difference
≤7 m No pre-pressure
adjustment is required.
>7 m Do the following:
▪ Increase the
pressure according to
the
installation
difference. The
pressure
increase by 0.1 bar for
each metre above 7 m.
▪ 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 outdoor unit. If the outdoor unit
is at the highest point of the installation, the installation
height is 0 m.
(b) The maximum water volume is 185 l in case the circuit is
only filled with water, and 105 l in case the circuit is filled
with water and glycol.
Minimum flow rate
Check that the minimum flow rate (required during defrost/backup
heater operation) in the installation is guaranteed in all conditions.
NOTICE
If glycol was added to the water circuit, and the
temperature of the water circuit is low, the flow rate will
NOT be displayed on the user interface. In this case, the
minimum flow rate can be checked by way of the pump
test (check that the user interface does NOT display error
7H).
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 or operation).
Minimum required flow rate
20 l/min
See the recommended procedure as described in
during commissioning" on page 67.
6 Preparation
Water volume
(b) (b)
>185/105 l
Do the following:
▪ Decrease the pre-
pressure according to
the required installation
height difference. The
pre-pressure should
decrease by 0.1 bar for
each metre below 7 m.
▪ Check if the water
volume does NOT
exceed the maximum
allowed water volume.
The expansion vessel of
the outdoor unit is too
pre-
small for the installation.
In this case, it is
required
recommended to install
height
an extra vessel outside
pre-
the unit.
should
NOT
"9.4 Checklist
Installer reference guide
25