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3.22 -
STARTING UP: Filling and de-aerating
the boiler and installation
CAUTION
Observe the following rules of safety:
- All work on the unit must take place in a
dry environment.
- LATTNERunits may never be in operation
without their housing, except in connection
with maintenance or adjustments.
- Never allow electrical or electronic
components to come into contact with
water.
NOTICE
Carry out the following tasks in connection
with maintenance, etc. to an already installed
unit:
-
Shut down all programs
-
Close the gas shut off valve
3.23 -
FILLING THE SYSTEM
WARNING!
Do not mix the CH system's water with anti-
freeze or anti-corrosion solutions using wrong
concentrations! It could cause damage to the
washers and could provoke noise during
normal boiler operation.
LATTNER refuses all liability for injury to
persons, animals or damage to property
deriving from not having respected the above
mentioned recommendations.
Before filling the heating system, the complete system, inclu-
ding all zones, must be thoroughly cleaned and flushed to
remove sediment.
Flush until clean water runs free of sediment. LATTNER sug-
gests using an approved system cleaner to flush the system,
but not the boiler. Always use LATTNER approved antifree-
zes. See the list at page 7.
Never use reverse osmosis, D.I., or distilled water for filling
the heating system.
WARNING!
Do not use petroleum-based cleaning or sea-
ling compounds in the boiler system. Damage
of seals and gaskets in boiler and system could
occur, resulting in substantial property dama-
ge.
The central heating installation needs to be
filled with potable water.
Use only potable water or approved glycol for
filling the heating system.
When the water hardness of the filling water
exceeds > 8 gpg the water has to be treated
until below the maximum value of 8 gpg
The pH value of the installation water must be
between 6.5 and 8.5. Check the pH value using
proper equipment or by having the water analy-
zed by a water treatment company.
If pH differs from above, contact LATTNER engineering for
further assistance.
Instructions for the installer
-
Shut off the power at the main power switch
-
Close the service valves (supply and return)
NOTICE
Take note of the following when maintenance
or adjustments are needed:
- The unit must be able to function during these
activities; for this reason, the unit's supply
voltage, gas pressure and water pressure
must be maintained. Ensure that this is not a
source of potential danger during these
activities.
WARNING
Following maintenance or other activities;
always check the installation of all
parts through which gas flows (with bubble
test using leak-search spray).
Failure to adhere to the water quality requirements will result
in a void of warranty.
Once all the connections are made, it is possible to fill the
circuit.
This operation has to be performed very carefully, by obser-
ving the following steps (boiler in Off position):
- open the radiator bleeds and make ascertain the good
operation of the automatic air vent fitted in the boiler.
- open progressively the filling valve and make sure the
automatic air vent, in the system, work properly.
- close the bleeders of the radiators when water starts to
come out.
- control via manometer (Optional) that the water pressure
has reached a minimum value of 11,6/14,5 psi (0,8/1) bar
- close the filling valve and bleed again all the radiators.
- inspect for the soundness all the hydraulic connections.
- after the commissioning of the boiler and the reaching of
the normal operation temperature, switch off the operation
of the boiler and the pump and repeate the bleed opera-
tion.
- let the installation cool down and, if necessary, add water
in order to reach the minimum presure of 11,6/14,5 psi
(0,8/1) bar
For the filling of the system it is necessary to
fit a filling valve on the C.H. return.
The boiler is equipped with its own drain cock,
whose position is shown in the figure of page
11. This cock never has to be used for the drain
of the system, because all the dirtiness of the
installation could accumulate in the boiler, com-
promising its operation. For that reason the in-
stallation must be equipped with own drain cock,
correctly sized according to the installation wa-
ter content.
33
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