8
2
Below is the diagram for the hydraulic connection of the product:
Key
Coupling
Garda 18
Garda 21
Garda 28
A - Hot water outlet *
½” - M
-
105
105
B - Cold water inlet
½” - M
-
155
155
C - System return
¾” - M
-
250
250
D - System flow
¾” - M
-
320
320
* The following output is installed only in models with domestic hot water production.
IMPORTANT:
Provide the water connection to a heating system capable of dissipating the maximum
rated thermal power of the appliance.
After checking inputs and outputs of water system, in relation to the type of installation to be made,
outfit the system taking into consideration some important issues:
For connection of product to couplings, preferably use flexible hoses to facilitate moving the
heater in case extraordinary maintenance must be performed at a later time.
Complete the connections by interposing shut-off cocks (ball valve cocks), in order to simplify
any extraordinary maintenance.
Connect the outlet of the safety valve to a disposable discharge.
If the model with domestic hot water production is to be installed, consider installing a 6-bar
safety valve.
In order to reduce limestone build-up, which cause pipes to clog, we recommend installing a
water softener if water is particularly hard (above 20°F).
2.3.1
Domestic hot water function
The production of domestic hot water is automatically managed by the components in the water kit
illustrated above.
The kit is fitted with a flow switch that detects the water flow for domestic use, which, in turn, allows the
3-way motorized valve to exchange with the plate heat exchanger contained in the kit.
At this moment, therefore, the water from the heating unit is pushed by the circulation pump through the
plate heat exchanger, thus producing hot water for domestic use.
To allow production of domestic hot water, the temperature in the heating unit must be at least 55° (Th20);
after determining flow and temperature suitability of the machine, the control unit sets the temperature
