Changing The Pre-Pressure Of The Expansion Vessel; To Check The Water Volume: Examples - Daikin EBLQ05+07CAV3 Installer's Reference Manual

6 Preparation
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)
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 38.
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)
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.
▪ Check if the water
volume does
exceed the maximum
allowed water volume.
Installer reference guide
28
f g
T1 T2 T3
M1 M2 M3
FHL1
FHL2
FHL3
"7.7.5 To protect the water circuit
170 220 270
150 185
B
Water volume
(b) (b)
>185/105 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 outdoor unit is too
pre-
small for the installation.
In this case, it is
recommended to install
NOT
an extra vessel outside
the unit.
(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/operation).
Minimum required flow rate
05+07 models
See the recommended procedure as described in
during commissioning" on page 75.
6.3.4 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
6.3.5

To check the water volume: Examples

Example 1
EBLQ05+07CAV3 + EDLQ05+07CAV3 + EKCB07CAV3 +
EK2CB07CAV3 + EKMBUHCA3V3 + EKMBUHCA9W1
Daikin Altherma low temperature monobloc
12 l/min
"9.4 Checklist
4P405544-1 – 2015.03