Water Chemistry Guidelines; System Filling And Emptying; Filling - Riello Condexa PRO NA 75P Installation, Operation And Service Manual

2.13.11 Water Chemistry Guidelines

9
NOTE: If using anti-freeze:
− Follow the boiler manufacturer's instructions on antifreeze
concentration.
− Frost protection and inhibitor level has to be checked an-
nually during the regular scheduled maintenance of the
condensing boiler.
9
NOTE: System damage!
− It is the installer's responsibility to ensure that the heating
system is compatible with the boiler type and size installed.
− pH-value of the heating water should be kept between 6.5
and 8.
To avoid any presence of oxygen in the system, it is advised to pre-
vent as little as possible air during installation. Usual spots where
air is most likely to seep in are: gaskets, pumps, air vents and
O-ring gaskets. Using an automatic water fill system exposes the
system to fresh oxygenated water. In commercial applications it is
recommended to install a water meter to measure the introduc-
tion of fresh water into the system.
A minimum water pressure is required for optimum performance.
Minimum water pressure required: 7.25 psi (0.5 bar).
Before and during assembly, the system must be kept free of im-
purities, construction dust, sand, copper dust, grease, carbon
deposits, etc., as well as welding flux residue. In any of these in-
stances, the old system must be rinsed with clear water mixed
with a highly concentrated rinse agent.
For freeze protection use only propylene glycol, with scale inhib-
itors, with a maximum volume [concentration] of 40% of glycol.
9
NOTE: When using anti-freeze in the primary circuit of the
boiler, use PP , CPVC or stainless steel venting only!
Water hardness must fall within the following limits:
50 ppm of CaCO < (alkali strength) < 150 ppm of CaCO
3
− Use only untreated water to fill the system.
− Do not use TSP (tri-sodium phosphate).
− Do not use fill water treated with salt bedding type ex-
changers (ion exchanger).
− Never introduce non-approved boiler treatment or similar
additives.
− Only use fill water with a hardness below 7 grains.
− Filling with chlorinated water is acceptable if chlorine levels
are below 100 ppm.
− Consult a local water treatment specialist for recommenda-
tions if any of the above is outside the stated ranges.
− When using oxygen permeable PEX, the system must be
separated from the boiler by a heat exchanger.
− A correctly sized and working expansion tank must be in-
stalled.
− Do not exceed the maximum permissible flow rate through
the boiler.
− Excessive flow can cause erosion damage to the heat ex-
changer.
− Eliminate System Leaks:
Continuous addition of make-up water will constantly
add oxygen to the system and lead to corrosion. All system leaks
must be repaired.
In the following table are listed the chemical water specifications.
Parameters
General feature
Dissolved Oxygen
Total iron (Fe)
Total copper (Cu)
Na2SO3
N2H4
PO4
Electrical conduc-
tivity

2.14 System filling and emptying

The Condexa PRO NA must be provided with a means of filling the
system to be connected to the appliance's return line.
RI
Before filling or emptying the system, switch the system's master
.
3
switch to the OFF position and the boiler's master switch to (0).

2.14.1 Filling

− Make sure the drain cock (1) is closed before you start filling
the system
1
39
INSTALLATION
Value
Colorless, no sediment
<0.05 ppm
< 0.3 ppm
< 0.1 ppm
< 10 pp,
< 3 ppm
< 15 ppm
< 500 microsiemens/inch