Installation Manual
Wall hung storage boiler Low NOx – Cod. 99960NA – November 2002
14
TECHNICAL DATA
DIFFERENTIAL AIR PRESSURE SWITCH FOR FAN CONTROL
To guarantee maximum safety in flue exhaust, a differential pressure switch is
installed on room-sealed boilers and on forced draught boilers. This pressure switch
automatically controls perfect functioning of the fan and the passage of both external
air and exhaust flue pipes.
DIVERTER VALVE VC 6012MG6000
The diverter valve is the device which controls the boiler switching from central
heating to d.h. water circuit and vice versa. The diverter valve is fitted with a manual
command lever C (fig. 3) which, when set on the top position, towards the valve
head, allows the boiler operating on the domestic hot water circuit while, when set on
the low position, the boiler operates on the central heating circuit.
When the C lever is set on the central position, it allows the actuator on midway.
In this position,
to be used only in case of motor failure or damage
, both central
heating and domestic hot water ports are open and both domestic hot water and
central heating circuits are operating.
To restore the initial position, separate the actuator and the valve body following
instructions from no.1 to no.4 (see fig.1).
To separate the motor from the valve body proceed as follows (fig.1):
1.
Press button A under the motor.
2.
Simultaneously keep the A button pressed and turn the actuator counter-
clockwise;
3.
Lift off the motor
4.
To disconnect the power supply cable press the B tap located on the pin C.
See fig. 3 to perform the electrical wiring of the diverter valve to the main printed
circuit board.
DOMESTIC HOT WATER PRODUCTION
The boilers are designed and built for the production of domestic hot water with a 25
lt. capacity storage tank. One advantage of this system is the amount of water immediately
available, thanks to the large exchanger surface of the coil inside the boiler which allows
different services to be used simultaneously.
As well as the use of a porcelain treated glass coating on both the coil and the internal boiler
surface to guarantee high levels of hygiene, the inside of the boiler also has a magnesium
anode which, in the event of galvanic currents, preserves it from corrosion to ensure it a longer
working life.
BOILER MAINTENANCE
(carried out by
Radiant Help Line
)
Every 12 months, or more frequently if the quality and consumption of water demand it, check
the condition of the magnesium anode and replace it if signs of wear are evident. To check the
condition of the anode 3 (see fig. 4), open valve 4 on the top of the boiler, undoing the red
knob in a clockwise direction. If water seeps out of the valve this means the anode is worn and
must be replaced. If on the other hand there is no evidence of water leaking out, the anode
can still be used. After carrying out the operation described here, remember to tighten the valve once
more.
If the water pressure exceeds 6 bar, fit a 2 lt expansion tank to the boiler, proceeding as follows (see
fig.1)
a. empty the water content of the boiler
b. undo the 1 / 2” cap (1) on top of the boiler;
c. fit the expansion tank 2;
d. fill the boiler once more.
D.H.W. CIRCULATING LOOP
It is possible to make a d.h.w. circulating loop. Please proceed as follows:
unscrew CAP A on the cylinder top, insert a copper PIPE B (supplied by the manufacturer with a kit) into
the ½” union and connect here the circulating loop pipe C. If necessary, fit an expansion vessel (as
shown in fig.5) inserting a “T” connection between the circulating loop pipe and the cylinder ½” union.
FLUE SAFETY THERMOSTAT
A
C
B
Fig. 5
-
Common
-
D.H. Water
-
Central Heating
CENTRAL HEATING SETTING
M5 TERMINAL
RAMIRE P.C. BOARD
light-
bl
ue
D.H. WATER SETTING
bl
ac
k
br
ow
n
Light-blue
Brown
Black
Fig. 1
Fig. 2
Fig. 3
1
3
2
4
Fig. 4
Summary of Contents for RMAS 21 E
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