Riello Start Aqua Condens 25/60 BIS, Installer And User Manual

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Start Aqua Condens 25/60 BIS
28
EMPTYING
Before starting emptying, switch off the electrical supply by turning off
the system's main switch
Heating system:
- close the shut-off devices of the heating system
- open the automatic bleed valve (
C
)
- manually loosen the system drain valve (
B
), keeping the elbow of
the hose in position to prevent it slipping from its seat
- the system's water is discharged through the discharge manifold
(
A
).
- drain the lowest points of the system.
Domestic hot water system:
When there is risk of frost, the domestic hot water system must be
emptied in the following way:
- turn off the main water supply tap
- unscrew the plug on the hose connection (
F
)
- connect a plastic pipe to the hose connection of the storage tank
discharge valve (
F
)
- release the discharge device of the valve
- turn on all the hot and cold water taps
- drain the lowest points of the system.
The discharge manifold (
A
) must be connected via a rubber
pipe to an appropriate collection and evacuation system in the
white water discharge drain in compliance with current regula-
tions. The outer diameter of the manifold is 20 mm: it is there-
fore advisable to use a rubber pipe Ø18-19 mm closed with a
suitable clamp (not provided). The manufacturer is not liable for
any damage resulting from the failure to channel the conden-
sate.
Eliminating the air from the heating circuit and boiler (fig. 24)
During the initial installation phase, or in the event of extraordinary
maintenance, you are advised to perform the following sequence of
operations:
- Open the lower automatic air vent valve cap (A) and leave it open
- Turn on the system filling tap on the hydraulic unit, and wait until
water begins to seep out of the valve.
- Switch on the electricity supply to the boiler, leaving the gas tap
turned off.
- Activate a heat request via the ambient thermostat or the remote
control panel, so that the 3-way valve goes into heating mode.
- Activate a DHW request by opening a tap for 30" per minute so that
the three-way valve cycles from heating to DHW and vice versa for
about ten times (in this situation, the boiler will go into alarm due to
lack of gas, therefore reset it whenever this is proposed).
- Carry on with the sequence until only water leaks out of the manual
air vent valve, and the air flow has stopped; now close the manual
air vent valve.
- Check the system pressure level is correct (the ideal level is 1 bar).
- Turn off the manual system filling tap on the hydraulic unit.
- Turn on the gas tap and ignite the boiler.
4 - COMMISSIONING AND MAINTENANCE
4.1 First commissioning preparation
Before the ignition and the functional testing of the
Start Aqua Con-
dens 25/60 BIS
boiler, it is necessary to:
- check that the system fuel and water supply taps are open
- check that the gas type and the power supply pressure are those
for which the boiler is designed
- make sure the cap on the vent valve is open
- check on the display that the pressure of the water circuit when
cold is between 1 bar and 1.5 bar and that the circuit is vented
- check that the pre-loading of the expansion tank is adequate (see
the "Technical data" table)
- check that the electrical connections have been carried out cor-
rectly
- check that the combustion product outlet and air suction pipes
were adequately realised
- check that the circulator turns freely; undo the inspection screw
and check with a flat screwdriver that the rotor shaft moves without
hindrances.
Before loosening or removing the closing tap of the circulator,
protect the underlying electrical devices from possible water
leakage.
4.2 First commissioning
- Adjust the ambient temperature thermostat to the desired temper-
ature (~20°C) or, if the system is equipped with a programmable
thermostat or timer, ensure that the thermostat or timer is "active"
and set correctly (~20°C)
- A variety of information appears on the display for each power sup-
ply, including the value of the flue gases probe meter (-C- XX - see
"Display and fault codes" - Fault A 09), the boiler will then start an
automatic venting cycle of about 2 minutes
- The display shows the symbol
To stop the automatic venting cycle, proceed as follows:
- Access the electronic board by removing the housing, turning the
instrument panel forwards you and opening the terminal board
cover.
Then:
- Press the CO button.