COSMOGAS FRYO 6PI, Instructions For Installation, Use And Maintenance Manual

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26 FRYO PI
COSMOGAS
5 - INSTALLATION
5.8 - Hydraulic connections
This appliance is designed to operate with a difference
temperature of 5°C between the supply and return. This is
achieved by circulating in the system a water flow equal to the
value given in the Figure 5-20. The designer must evaluate
all the pressure drops of the system (consider in addition the
pressure drops of the linear pipe, also those of the various
accessories such as taps, check valves, 90 ° elbows, 45 °
elbows, lockshields, 3-way valves, etc.), which, for this flow
rate, are lower than the available head (see Figure 5-20).
An incorrect sizing of the system causes a low water flow or
frost risk alarm to the plate heat exchanger (section 8).
WARNING !!! Make sure that the available head is
sufficient to reach the desired flow rate. If the water flow
is not enough, add a pump.
WARNING !!! In the case of use of zone valves that
can reduce the water flow to regulate the temperature of
the rooms, it is necessary to separate the water flow of
the system from that of the machine (Figure 4-4).
WARNING !!! All the supply and return pipes must
be insulated to prevent the condensate produced during
the cooling phase, from falling on sensitive areas.

After the electrical installation, connect the water inlet and
outlet pipes in accordance with local regulations in force.

For the diameters of the water inlet and outlet pipes refer
to the Figure 3-1.

Before use, clean the hydraulic circuit.

After installation, test the tightness of the hydraulic circuit
under pressure.
5.8.1 - Filter

Place a mesh filter on the return connection to keep the
water clean and collect impurities (Figures from 4-2 to 4-6,
detail “2”).

Be sure to keep the mesh filter pointing downwards.

It is recommended to mount ball valves before and after
the filter to allow for easy cleaning or replacement.
5.8.2 - Connect the water system filling
For the water system filling, it is necessary to connect the
water net system to the hydronic circuit, as shown in Figures
4-3 to 4-6. In the branch to the net water system, a pressure
reducer, a check valve, an interception valve and a pressure
gauge must be provided.
WARNING !!! Find out about any local regulations,
because they may include devices other than those
mentioned above regarding the connection of closed and
potentially polluted circuits to net water system.

The chloride contained in the water must be below 300
ppm at a temperature below 60 ° C.

The pH value of the water must be between 6 and 8.

Do not use water with ammonia.

Install a metal mesh filter on the return (Figure from 4-3
to 4-6).

Be sure to use clean water to ensure that the appliance
works in high efficiency for a long time.
Model
Minimum
water flow
Available head
l/h kPa
6Pi 1044 60
9Pi 1548 53
13Pi 2196 80
Figure 5-20 - Water flow rate and available head