Main Features; Technical Specifications; Installation And Assembly - Roca NR-15/20 Installations-, Montage- Und Betriebsanleitung

Se puede comprobar la presión de alimentación
en la toma (29) que incorpora la caldera.Ver
figura 23.
Cambio de gas
La utilización de un gas diferente del gas de
orígen comporta sustituir la válvula de gas por
la adecuada.
La válvula es un conjunto monobloc no
manipulable que incluye inyectores y diafrag-
mas. Si se pasa de gas ciudad a natural, además,
se ha de anular el regulador (28) (fig.23).
Importante: Los ajustes, reglajes o modifica-
ciones que afecten al gas deben ser
efectuados por un profesional cualificado.
Regulación A.C.S.
Mediante el grifo de entrada de agua fría (19) de
la figura 2, se puede corregir el caudal/
temperatura, según las necesidades de A.C.S.
No obstante, la caldera dispone de un limitador
decaudal regulado a 15 litros/min, aproxima-
damente (entre 1 y 10 bar), que impedirá
aumentar este caudal.
La temperatura del caudal de agua caliente
solicitada dependerá de la temperatura del agua
fría de la red. La regulación final se hará a través
del grifo de consumo.
Consumos de Agua Caliente Sanitaria:
Temperatura salida
Temperatura 55°C
agua fría
Litros/min. Litros/hora Litros/min. Litros/hora
10°C 7,4 444
15°C 8,3 498
20°C 9,5 570
25°C 11,1 666
* Limitador de caudal
Montaje y desmontaje de la envolvente
Suspender los paneles laterales de los pivotes
de centraje (30). Ver figura 24.
Fijar los paneles mediante dos tornillos (31). Ver
figura 25. Suspender el panel frontal de los
pivotes de centraje (32) y fijarlos mediante dos
tornillos (33) en los orificios anteriores de cada
lateral. Ver figuras 25 y 26.
Para el desmontaje proceder de forma inversa.
Marcado CE
Las calderas murales de gas Roca son
conformes a la Directiva Europea
89/336/CEE de Compatibilidad
Electromagnética, a la Directiva Europea
90/396/CEE de Aparatos de Gas, a la
Directiva Europea 73/23/CEE de Baja
Tensión y a la Directiva Europea
92/42/CEE de Rendimiento.
8
GB

Main features

Boilers for Central Heating and Instantaneous
Domestic Hot Water production. The Domestic
Hot Water function takes priority over central
heating.
In the R-20/20FF and R-20/20 FP boiler,
combustion is independent of the room where it
is located (room-sealed). The air required for
combustion is drawn directly from outside as
the flue gases are removed by an exhaust fan.
In the R-20/20T boiler, combustion takes place
in an open chamber and the air required for
combustion is taken from the boiler room itself.
The flue gases are also evacuated via an
exhaust fan.
No membranes, oil seals or moving parts which
are liable to break down.
Electronic control of all functions.
Control panel with digital screen.
Fully automatic ignition, without pilot flame.
Flame safeguard rectification system.
Selected operating temperature accurate to 1°C
with permanent display of current temperature.
Central Heating and Domestic Hot Water modulation.
Permanent information of output modulation.
Permanent anti-freeze protection feature.
Coded information on anomalies.
Pump lockout protection feature.
Temperatura salida
High-performance bithermal heat exchanger.
40°C
The whole boiler may be dismantled through the
front panel.
Water connections kit with shut-off valves and
11,1 666
drain cocks.
13,3 798
By-pass valve incorporated in the boiler. DHW
monitoring by means of a magnetic flow switch.
(*)15 900
Pressure switch for insufficient combustion air
(*)15 900
(in R-20/20FF and R-20/20T only).
Safety feature for insufficient water pressure in
the Heating circuit.
Safety feature for overheat in the Heating circuit.
Flue gas overflow safety feature (in B11BS
models of NR-15/20 and R-20/20).

Technical specifications

Boiler type:
NR-15/20, R-20/20 and P = 811/ B11BS.
R-20/20FF and FP
R-20/20T
Electrical output:
NR-15/20
R-20/20 and R-20/20P
R-20/20FF & R-20/20T, FP = 200 W.
Power supply: 220/230V ~ 50Hz, single-phase.
Pump capacitor: 3.5mF.
Number of injectors: 13
Approx. weight:NR-15/20 & R-20/20 and P = 40 kg
Net efficiency: 90%
Expansion vessel capacity: 8 litres.
Expansion vessel fill pressure: 0.35 bar
Safety valve set at 3 bar.
Ambient thermostat (optional) at 220V.
Central Heating Mode
Heat output of R-20/20, R-20/20FF and
R-20/20T:Adjustable from 6,000 kcal/h (7kW) to
20,000 kcal/h (23.25kW).
For NR-15/20: Adjustable from 6,000 kcal/h
(7kW) to 15,000 kcal/h (17.44kW).
Maximum circuit pressure: 3 bar.
Maximum working temperature: 90°C.
Fill pressure: 1.5 bar.
(1 kW = 860 kcal/h).
Domestic Hot Water Mode
Heat output: Adjustable from 6,000 kcal/h (7kW)
to 20,000 kcal/h (23.25kW).
Maximum circuit pressure: 7 bar.
Maximum working temperature: 60°C
DHW production:
= C12/C32/C42/C82.
= B22.
= 110 W.
= 120 W.
R-20/20FF & R-20/20T and FP = 45 kg
∆t = 25°C - 13.3 I/min.
∆t = 30°C - 11.1 l/min.
∆t = 35°C - 9.5 l/min.
Minimum operating pressure and flow rate for
ignition: 0.2 bar and 3 I/min.
NR-15/20, R-20/20, R-20/20FF,
Model
R-20/20 T, R-20/20 P and R-20/20 FP
Category (**) II 2H 3+
Natural Butane
Type of gas
G20 G30
Consumption (*) 2,75 (1)2,05
Supply (mbar)
20 28-30
pressure
Burner setting
9,4 26,3
press (mbar)
Inyector size
1,30 0,75
(mm)
3
(*) Consumption at 20 Th (m (st)/h at 15°C and 1013 mbar)
(1) kg/h
Delivery
R-20/20FF, R-20/20FP and R-20/20T: Supplied
in two packs:
1. Boiler with separate jacket, electrical
connector, paper marking template and upper
support with fixing screws and nuts.
2. Assembly for smoke outlet.
NR-15/20, R-20/20P and R-20/20: Supplied in
one pack:
1. Boiler with separate jacket, electrical
connector, paper marking template and upper
support with fixing screws and nuts.
(We can supply on demand the Support-Tem-
plate, with hydraulic connections, the complete
support and the template for hydraulic testing).

Installation and assembly

Recommendations
The boiler must be mounted on a resistant wall
with a minimum thickness of 6 cm, using
adequate Rawlplugs.
It should not be placed over cookers or other
cooking devices giving off steam or gases.
It can be mounted between kitchen cupboards,
allowing a minimum clearance of 1 cm so that side
panels can be removed for servicing the boiler.
The installation must be carried out by a qualified
professional.
Please observe current regulations regarding
safety of these apparatus: Hydraulic, gas, and
electric (Low Voltage) installations, fire,
ventilation, evacuation of flue gases, special
requirements for public premises, etc.
The transparent peel-off film which protects the
control fascia should be removed.
Location and water connections
Use the paper marking template supplied to mark
the correct distance between the upper support
and the hydraulic connections. Fix the upper
support. Extend the hydraulic connections from
the installation up to the boiler. See
Conduct the hydraulic.
Remove the plastic caps from the boiler tappings.
Lift the boiler, place it in front of the upper legs of
the wall-mounting bracket and rig it into place.
Ensure that the boiler is in an upright position.
Tighten the various water and gas connections.
Identification of valves
See Figure 2.
15. Safety valve (1/2")
16. CH flow valve (3/4")
17. DHW outlet (1/2")
18. Gas inlet cock (3/4")
19. Cold water inlet (3/4")
20. CH return valve (3/4")
25. Heating Circuit fill valve.
26. Heating Circuit drain cock.
Flue duct
NR-15/20, R-20/20P and R-20/20: Connect the
boiler to the flue duct, observing current
regulations. The flue duct must be designed
taking into account that the maximum rate of
flow of the products of combustion is 17.8 g/s
and that their mean temperature is 107°C.
Propane
G31
(1)2,02
37
34,3
0,75
figs. 1 and 2.