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II.9 Water connections
II.9.1 Connection to the system
IMPORTANT!
The layout of the water system and connection of the system to the unit
must be carried out in conformity with local and national rules in force.
IMPORTANT!
We recommend installing isolating valves that isolate the unit from
the rest of the system. Mesh filters with a square section (longest side
= 0.8 mm), of a suitable size and pressure drop for the system, must be
installed. Clean the filter from time to time.
o The unit is designed for outdoor installation.
o The unit is fitted with Victaulic type water circuit connections on the air
conditioning system water inlet and outlet.
o The unit must be positioned to comply with the minimum recommen-
ded technical spaces, bearing in mind the access to water and electrical
connections.
o The unit can be equipped with anti-vibration mounts upon request (SAG).
o Shut-off valves must be installed that isolate the unit from the rest of the
system. Elastic connection joints and system/machine drain taps also need
to be fitted.
o The water flow through the heat exchanger must respect the MAXI-
MUM/MINIMUM values indicated in the "Operating limits" section.
o Correct installation and positioning includes levelling the unit on a
surface capable of bearing its weight.
o It is advisable to drain the water from the system during long periods of
inactivity.
o It is possible to avoid draining the water by adding ethylene glycol to
the water circuit (see "Use of antifreeze solutions").
o The size of the expansion tank must be calculated by the installer de-
pending on the system. In the event of models without a pump, the pump
must be installed with the supply pressing against the machine's water
intake.
o Installing an air bleed valve is recommended.
o Once the connections to the unit are made, check that none of the
pipes leak, and bleed the air from the system.
II.9.4 Hydraulic data
Model
Hydraulic technical data
Expansion tank capacity
Expansion tank pre-load
Expansion vessel maximum pressure
Safety valve
Water contents
Plate heat exchangers (main heat exchanger)
Plate heat exchangers (secondary heat exchanger)
Plate heat exchangers (DS accessory)
Tank water content (ASP1/ASP2)
EQPI3X
II.9.2 Installation and pump management if external to the
unit
The circulation pump to be installed in the main water circuit should be
selected to overcome any pressure drops, at nominal rates of water flow,
both in the exchanger and in the entire water system. The operation of the
user pump must be subordinated to the operation of the unit; the micro-
processor controller performs the control and management of the pump
according to the following logic: when the machine is turned on, the first
device that starts is the pump, priority over the rest of the plant. During
start-up, the differential pressure switch of minimum water flow moun-
ted on the unit is ignored, for a preset time, to avoid slippage due to air
bubbles or turbulence in the hydraulic circuit. After this time, the definitive
consent to start the machine is given. The pump maintains a functioning
strictly related to the operation of the unit and is only excluded when the
shutdown command is activated. After switch-off, the pump will continue
to operate for a pre-set time before finally stopping, in order to disperse
the residual heat in the water exchanger.
See also section attachment "hydraulic circuits".
II.9.3 Minimum hydraulic circuit contents
To ensure the unit works correctly, the system needs a minimum volume
of water
The minimum water content is determined on the basis of the unit's cool-
ing or heating capacity (for heat pumps/EXP) in the design of the unit, mul-
tiplied by the coefficient expressed in 7 l/kW (*).
If the water content of the system is below the minimum value calculated,
install an additional tank.
However, remember that a high water content in the system always goes to
the advantage of comfort in the room, as it ensures a high thermal inertia of
the system.
* For heat pumps/air cooled EXP, also pay attention to the temperature dif-
ference generated during the natural defrosting cycles:
DT tank and/or DHW
(by defrost effect)
Specific capacity
270
280
l
12
12
barg
2
2
barg
10
10
barg
6
6
270
280
l
7,1
8,8
l
7,1
8,8
l
-
-
l
230
230
K
10
8
l/kW
7
9
290
2100
2115
12
12
12
2
2
2
10
10
10
6
6
6
290
2100
2115
10,1
10,1
11,4
10,1
10,1
11,4
-
-
1,3
230
230
440
EN
7
6
10
12
2130
12
2
10
6
2130
11,4
11,4
1,3
440
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