Important Recommendations - baxiroca CPA-BT Serie Instrucciones De Instalación, Montaje Y Funcionamiento Para El Instalador

20 – Check that there is no foreign body in the
combustion chamber. Fix the inspection
window assembly on the door (57). Fig. 24.
21 – Proceed to start up and adjust the burner,
making sure that all valves are open and that
the pump operates correctly.
22 – Start up the boiler and check for leak
tightness of fl ue gases with the burner at
full output. Should leak tightness not be
complete, re-tighten the nut or door clamp
nearest to the zone where the gases escape.
Having achieved complete gas-tightness,
tighten all the backnuts (6) on the hinge
side, one against the door (48) and the other
against the hinge (49). Fig.6. Do the same on
the side of the clamps, remembering, once
tightened (2) to lock the position with the
existing Allen screw (50) Fig.25.
23 – Immediately after proceed to assemble the
door casing. First open the door by undoing
the clamps. Then unscrew the arms of the
clamps.
CPA 55-BT to CPA 230-BT boilers
23.1 – Remove the burner temporarily without
needing to disconnect the oil and electricity
supplies.
23.2 – Undo the inspection window assembly.
Position the casing on the door and fi x it
to this with the four screws supplied (51).
Fig. 26.
23.3 – Replace the arms of the clamps and the
inspection window assembly.
23.4 – Replace and fi x the burner on the door.
CPA 290-BT to CPA 1740-BT boilers
23.1 – The door casing is supplied in two parts. To
assemble them, a light pressure is enough
for the upper (52) Fig. 26 and lower pins to
enter the housing clip. It is not necessary
to remove the burner.
23.2 – Join the two parts of the casing with the
upper screws (53) and the two lower screws
(54) provided. Position the casing on the
door and fi x it to this with the four screws
(51) provided.
23.3 – Replace the arms of the door clamps.
Operation
Checks and steps to follow for starting up the
boiler and the installation.
Preliminary operations
– Check that the installation is full of water, vented
and a pressure of 0,5 bar above the static head
of the installation, at least.
– Start up the pump or pumps. Check that they
are turning.
– Bleed the air from the installation and radiators.
– In sealed & pressurised systems, refi ll with
water until the adjustable pointer is slightly
above the position of the fi xed one.
– Close the boiler door, tightening it with the
clamps until they come up against the backnuts
(2) incorporated.
First lighting
– Follow the instructions which are supplied with
the burner.
– Set the control thermostat (34) Fig. 4 to
about 80 °C and check that this and the limit
thermostat operate correctly.
– The two stage basic control panel (38), is
prepared for controlling the burner in two stages,
and therefore incorporates two control thermos-
tats (34) Fig. 4. The thermostat regulated to
lower temperatures controls the second stage,
whilst the other, which is regulated to higher
temperatures, controls the fi rst stage.
– Vent the installation again and check that the
radiators warm up satisfactorily.
18

Important recommendations

– If there is danger of freezing, add some anti-
freeze product to the water.
– Keep the same amount of water in the system
at all times; water should only be added when
topping up is absolutely necessary.
– Uncontrolled topping up with water may cause
limescale deposits in the boiler, damage it
seriously and reduce its performance.
– We recommend that the properties of the water
in the system be:
pH between 7.5 and 8.5.
Hardness: 8 to 12 French degrees (*).
(*) One French degree is equivalent to 1 gram of
calcium carbonate per 100 litres of water.
Prevention of condensation
Condensation in boilers is harmful, especially
when they are made of steel. With a combustion
set to 25% excess air, boilers are suitable for
operating with a minimum boiler temperature and
return temperature, showed in the the following
table:
Requirement
1 stage or
Burner
2 stage
operation
65 – 100%
Oil 35°C
Minimum return
Temperature
Gas 39°C
Oil 50°C
Minimum boiler
Temperature
Gas 57°C
When installation requires lower temperatures
than those of the table, it will be necessary to add
a by-pass pump to raise the return temperature
and/or a 3 way mixing valve to have a flow
temperature lower than boiler temperature.
Pr
C
Pj
Vm Mixing valve
M
Sm Flow sensor
Se Outdor sensor
The "Pr" by-pass pump can be calculated for a
water fl ow about 50% of the main heating pump
of the installation "Pi" and with possibility to
overcome the boiler pressure drop (always less
than 0,1 bar).
Attention:
Characteristics ana performance qualities are
subject to change without notice.
CE Marking
The products listed in this document comply
with the European Directive 2004/108/
CEE on Electromagnetic Compatibility, the
Low Voltage Directive 2006/95/CEE, the
Effi ciency Directive 92/42/CEE, the 97/23/CEE
Pressurized Equipments and the 2009/142/
CEE Gas Appliances.
2 stage Modulating
50 – 100% 35 – 100%
37°C 40°C
40°C 47°C
51°C 53°C
58°C 60°C
Byass pump
Boiler
Heating pump
Mixing valve motor