Robur K18 Hybrigas, Installation, Use And Maintenance Manual, Page: 31 / 60

Heating engineer
Installation, use and maintenance manual – K18 Hybrigas
31
3
3.6 SYSTEM WATER QUALITY
Responsibility of the user/operator/installer
The installer, operator and user must assure system water quali-
ty (Table 3.2
p. 31). Failure to comply with the manufacturer's
guidelines may affect operation, integrity and life of the appli-
ance, voiding the warranty.
System water features
Free chlorine or water hardness may damage the appliance.
Adhere to the chemical-physical parameters in Table 3.2 p. 31
and the regulations on water treatment for residential and in-
dustrial heating systems.
Table 3.2
Chemical and physical parameters of water
CHEMICAL AND PHYSICAL PARAMETERS OF WATER IN HEATING/
COOLING SYSTEMS
PARAMETER
UNIT OF
MEASUREMENT
ALLOWABLE RANGE
pH / > 7 (1)
Chlorides mg/l < 125 (2)
Total hardness (CaCO
3
)
°f < 15
°d < 8.4
Iron mg/kg < 0,5 (3)
Copper mg/kg < 0,1 (3)
Aluminium mg/l < 1
Langelier’s index / 0-0,4
HARMFUL SUBSTANCES
Free chlorine mg/l < 0,2 (3)
Fluorides mg/l < 1
Sulphides ABSENT
1 with aluminium or light alloys radiators, pH must also be lower than 8 (in compliance
with applicable rules)
2 value referred to the maximum water temperature of 80 °C
3 in compliance with applicable rules
Water topping up
The chemical-physical properties of the system's water may alter
over time, resulting in poor operation or excessive topping up.
▶
Ensure there are no leaks in the installation.
▶
Periodically check the chemical-physical parameters of the
water, particularly in case of automatic topping up.
Chemical conditioning and washing
Water treatment/conditioning or system washing car-
ried out carelessly may result in risks for the appliance,
the system, the environment and health.
▶
Contact specialised firms or professionals for water treat-
ment or system washing.
▶
Check compatibility of treatment or washing products with
operating conditions.
▶
Do not use aggressive substances for stainless steel or cop-
per.
▶
Do not leave washing residues.
▶
Always refer to the requirements of the standards and exist-
ing regulations.
3.7
INSTALLATION FILLING
How to fill up the system
After completing all water, electrical and gas connections:
1. Slightly loosen the cap of the jolly valve on the circulating
pump of the boiler module (at the bottom left inside the
boiler module) to release the air (detail 1 Figure 3.7 p. 31).
2. Slightly loosen the cap of the jolly valve placed on the top
right on the condensing block of the boiler module (Figure
3.9
p. 32) to release the air from the top.
3. Open the system filling cock and let out all the air.
4. Check with pressure gauge M (Figure 3.8 p. 31) that sys-
tem pressure reaches 1,5 bar.
5. Open the automatic air purging valves on the system, if any,
and check the air purging process.
6. Make sure that the unit is powered electrically.
7. Send an operating request to the unit for a few seconds. The
circulating pump will be immediately activated.
8. Remove the request before the burner is activated. The cir-
culating pump will continue to circulate the water for the
post-circulation time.
9. Check and clean the filter on the inlet pipe.
10. If, after the above operations, a decrease in system water
pressure is observed, open again the system filling cock until
the system pressure reaches 1,5 bar;
11. Repeat items 7, 8, 9 and 10 until the pressure has stabilised
(at least 1,5 bar).
Figure 3.7
Jolly valve on boiler circulating pump position
1 Cap of the jolly valve
1
Figure 3.8 Boiler pressure gauge position
M Pressure gauge
M