Carrier 020-093 Installation, Operation And Maintenance Instructions page 54

12 - FACTORY OPTIONS AND ACCESSORIES
Hydraulic circuit
■ Circuit fi lling
The charging system is connected to the boiler's return line.
Automatic fi lling valve 1/2".
Pressure gauge
Filling valve
- Before fi lling the system, switch-off the thermal module's
switch (0) and switch-off the magnetothermic switch placed
in the electrical cabinet of the 50FF/FC unit.
- Make sure that drain cocks (1) are closed before to start the
load of the system.
1
- Unscrew the vent valve's release cap.
- Open the shut-off cocks in order to slowly fi ll the system.
- Use the pressure gauge to check that the pressure is rising
and the water is exiting through the vent valves.
- Close the shut-off cocks after the pressure reaches 1.5 bar.
- Start-up the circulation pump. This operation can be
performed manually from a screen of the "50FC" electronic
control (on a screen of the "Service menu", password
protected).
- During this stage, check that the air is correctly eliminated.
- Restore the pressure if necessary.
- Stop the pump and start-up again.
- Repeat the last three steps until the pressure is stabilised.
Excessive pressure fl uctuations can cause stress and fatigue
to the heat exchanger. Keep the operating pressure constant.
Immediately repair any leaks or drips that could result
in air entering the system.
54
■ Circuit emptying
In case of long unit stops, and forcibly if they happen in the
winter season, the circuit must be emptied.
- Before emptying the system, switch-off the thermal module's
switch (0) and switch-off the magnetothermic switch placed
in the electrical cabinet of the 50FF/FC unit.
- Close the water supply shut-off cocks.
- In order to empty the boiler, fi t a rubber hose (5) (inner
diameter int. Ø = 12 mm) to the thermal module's discharge
valve (1).
1
5
■ Water quality requirements
It is ABSOLUTELY NECESSARY to treat the water system in
order for the heat generator to work properly and to guarantee
its service life, as well as that of all its components.
The water used for the central heating circuit must conform to
the quality parameters given in the following table:
Parameter
General characteristic
PH value
Dissolved oxygen
Total iron (Fe)
Total copper (Cu)
Na2SO3
N2H4
PO4
CaCO3
Trisodium phosphate
Chlorine
Electrical conductivity
Pressure
Glycol
(only propylene glycol)
All data in the table refer to water contained in the
system after 8 weeks' operation.
Do not use excessively softened water. Excessive water
softening (total hardness < 5° f) results in corrosion due
to contact with metal elements (pipes or thermal module
components).
To prevent the water from freezing, with this option the 50FF/
FC unit always has an anti-freezing thermostat. Add glycol to
the water if necessary (only propylene glycol).
Value Unit
Colourless, without
sediment
Min. 6,5 ; Max. 8,0 pH
< 0,05 mg/l
< 0,3 mg/l
< 0,1 mg/l
< 10 mg/l
< 3 mg/l
< 15 mg/l
Min. 50 ; Max. 150 ppm
None ppm
< 100 ppm
<200
μSiemens/cm
Min. 0.6 ; Max. 6 bar
Max. 20%
%