Hydraulic Connections; Heating Circuit - Fujitsu Waterstage Split Comfort 5 Series Installation Manual

Hydraulic connections

See "Basic Hydraulic Layouts", page 74
►

Heating circuit

▼ Flushing the installation
Before connecting the hydraulic unit to the installation,
rinse out the heating system correctly to eliminate
any particles that may aff ect the appliance's correct
operation.
Do not use solvents or aromatic hydrocarbons (petrol,
paraffi n, etc.).
Flush the installation several times before
proceeding to the fi nal fi lling.
In the case of an old installation, provide a suffi ciently
large decanting pot with a drain on the return from the
heat pump and at the lowest point in the system in order
to collect and remove any impurities.
In some installations, the presence of diff erent
metals can cause
the formation of metal particles and sludge can appear
in the hydraulic circuit. In this case, it is advisable to use
a corrosion inhibitor in the proportions indicated by the
manufacturer. You must also ensure that treated water
does not become corrosive (neutral pH: 7 <pH <9).
Flush the installation several times before
proceeding to the fi nal fi lling.
▼ Connections
The heating circulation pump is built into the hydraulic
unit.
Connect the central heating pipes to the hydraulic unit
correctly according to the direction of circulation.
The pipe between the hydraulic unit and the heat collector
must be at least one inch in diameter (26x34 mm).
Calculate the diameter of the pipes based on fl ow rates
and lengths of the hydraulic systems.
Tightening torque: 15 to 35 Nm.
Use union connectors to make it easier to remove the
hydraulic unit.
Try to use connection hoses to avoid transmitting noise
and vibrations to the building.
Connect the drains from the drain valve and the safety
valve to the main sewer system.
Verify that the expansion system is correctly connected.
Check the expansion vessel pressure (pre-infl ated to
1 bar) and the safety valve is calibrated.
The fl ow rate of the installation must be at least equal
to the minimum value mentioned in the table
characteristics", page 7. The installation of a regulator
(other than those included in our confi gurations) which
reduces or stops the fl ow through the hydraulic unit is
prohibited.
- 32 -
corrosion problems;
"General
1
2
3
5
4
5
6
7
8
9
10
11
Key :
1. "Liquid" refrigeration connection.
2. "Gas" refrigeration connection.
3. Heating return (1 circuit).
4. Heating fl ow (1 circuit).
5. Stop valve (not provided).
6. DHW outlet (domestic hot water).
7. DCW inlet (domestic cold water).
8. Shut-off (not provided).
9. Filling.
10. Safety valve (mandatory / not supplied).
11. Connections to sewer with siphon
(safety valve).
fi g. 37 - Connections
Waterstage Split Comfort DHW Serie / INSTALLATION / 2125 - EN