Connecting The Water Circuit - Daikin EDLQ036BA6VJU1 Manuel D'installation

Checking the maximum allowed water volume
To determine the maximum allowed water volume in the entire circuit,
proceed as follows:
1 Determine for the calculated
corresponding maximum water volume using the graph below.
2 Check that the total water volume in the entire water circuit is
lower than this value.
If this is not the case, the expansion vessel inside the unit is too small
for the installation.
figure "Maximum allowed water volume"
40
2.5
35
30
2
25
1.5
20
15
1
C
10
0.5
0.3 4.4
0 5.3 10 20 30 40 50
0 20 50 100 150 200
maximum water volume
= pre-pressure
= maximum water volume
A = Sytem without glycol
B = System with 25% propylene glycol without
domestic hot water tank
C = System with 25% propylene glycol with
domestic hot water tank
(Refer to "Caution: "Use of glycol"" on page 16)
Example 1
The unit is installed 16.4 ft (5 m) below the highest point in the water
circuit. The total water volume in the water circuit is 26.4 gallons
(100 l).
In this example, no action or adjustment is required.
Example 2
The unit is installed at the highest point in the water circuit. The total
water volume in the water circuit is 92.5 gallons (350 l).
Result:
Since 92.5 gallons (350 l) is higher than 74.0 gallons (280 l), the
pre-pressure must be decreased (see table above).
The required pre-pressure is:
Pg = (H /32+0.3)x14.5 psi = (0/32+0.3)x14.5 psi = 4.4 psi
(psi) (ft)
Pg = (H /10+0.3) bar = (0/10+0.3) bar = 0.3 bar
(bar) (m)
The corresponding maximum water volume can be read from
the graph: approximately 108.0 gallons (410 l).
Since the total water volume (92.5 gallons (350 l)) is below the
maximum water volume (108.0 gallons (410 l)), the expansion
vessel suffices for the installation.
Setting the pre-pressure of the expansion vessel
When it is required to change the default pre-pressure of the
expansion vessel (14.5 psi (1 bar)), keep in mind the following
guidelines:
Use only dry nitrogen to set the expansion vessel pre-pressure.
Inappropriate setting of the expansion vessel pre-pressure will
lead to malfunction of the system. Therefore, the pre-pressure
should only be adjusted by a licensed installer.
EDLQ036~054BA6VJU1 + EBLQ036~054BA6VJU1
Unit for air to water heat pump system
4PW56182-1
pre-pressure (Pg)
B A
74 [gallons]
60 70 80 90 100 110 120
[l]
250 300 350 400 450

Connecting the water circuit

Water connections must be made in accordance with the outlook
diagram delivered with the unit, respecting the water in- and outlet.
the
Be careful not to deform the unit piping by using excessive
force when connecting the piping. Deformation of the
piping can cause the unit to malfunction.
If air, moisture or dust gets in the water circuit, problems may occur.
Therefore, always take into account the following when connecting
the water circuit:
Use clean pipes only.
Hold the pipe end downwards when removing burrs.
Cover the pipe end when inserting it through a wall so that no
dust and dirt enter.
Use a good thread sealant for the sealing of the connections.
The sealing must be able to withstand the pressures and
temperatures of the system.
When using non-brass metallic piping, make sure to insulate
both materials from each other to prevent galvanic corrosion.
Because brass
material, use appropriate tooling
for connecting the water circuit.
Inappropriate tooling will cause
damage to the pipes.
NOTE The unit is only to be used in a closed water
system. Application in an open water circuit can
lead to excessive corrosion of the water piping.
Never use Zn-coated parts in the water circuit.
Excessive corrosion of these parts may occur as
copper piping is used in the unit's internal water
circuit.
When using a 3-way valve in the water circuit.
Preferably choose a ball type 3-way valve to
guarantee full separation between domestic hot
water and floor heating water circuit.
When using a 3-way valve or a 2-way valve in the
water circuit.
The recommended maximum changeover time of
the valve should be less than 60 seconds.
Protecting the water circuit against freezing
Frost can cause damage to the hydraulic system. As this unit is
installed outdoors and thus the hydraulic system is exposed to
freezing temperatures, care must be taken to prevent freezing of the
system.
All hydraulic parts are insulated to reduce heat loss. Insulation must
be foreseen on the field piping.
The unit is already equipped with several features to prevent freezing.
The software contains special functions using pump and back
up heater to protect the complete system against freezing.
This function will only be active when the unit is off.
As extra safety, a heatertape is winded around the piping to
protect vital parts of the hydraulic system inside the unit.
This heatertape will only be active in case of an abnormal
situation concerning the pump and will only protect internal parts
of the unit. It can not protect field installed parts outside the unit.
Field heater tape must be foreseen by the installer.
However in case of power failure, above mentioned features can not
protect the unit from freezing.
If power failure can happen at times the unit is unattended, Daikin
recommends adding glycol to the water system. Refer to Caution:
"Use of glycol" on page 16.
Refer to "[4-04] Freeze protection function" on page 28.
is a soft
Installation manual
15