Installation Manual
Wall hung storage boiler Low NOx – Cod. 99960NA – November 2002
15
17
14
6
21 12
16
25
26
13
20
31
36
8
6
30
4
22
7
11
3
33
5
32
15
12
23
27
29
1
28
LIMITER
The boiler is equipped with a variable flow limiter at the cold water inlet. The flow limiter
can be adjusted by turning the screw (see fig.2 pos.C) in order to obtain the correct flow
rate of domestic hot water for the specific boiler output.
FLOWSWITCH
This device gives precedence to domestic hot water and is fitted to boilers which supply
instantaneous hot water (see fig. 1, item B fig. 2). It allows conversion to hot water even
with a minimum hot water demand (2 litres/min.), using an electromagnetic principle with
electrical switching by means of a relay. The device is made of non-toxic, corrosion-proof
ZYTEL 101 L plastic material which has type approval with non-toxic characteristics and
is unaffected by hard water. In addition, a filter is fitted before the flowswitch and at the
cold water inlet which eliminates any water impurities. These features guarantee that the
flowswitch operation is highly efficient.
BY-PASS
All boilers are fitted with a by-pass. This element is essential in the following cases:
if a two-way zone valve is installed
if thermostat valves are installed in the radiators.
To adjust the by-pass proceed as follows (see fig. 2 pos.A): fit the screwdriver to the
plastic screw of the by-pass, bearing in mind that when the slot of the screw is horizontal
the by-pass is totally open, allowing all the water to pass, while when it is vertical the by-
pass is totally closed. For partial by-pass flows, use the adjuster screw.
KEY
1.
FRAME
2.
-
3.
FLUE HOOD – ROOM SEALED COMBUSTION CHAMBER
4.
COMBUSTION CHAMBER
5.
ROOM SEALED CHAMBER COVER
6.
ROOM SEALED CHAMBER BACK
7.
HEAT EXCHANGER Mod. 20.000
8.
MULTIGAS BURNER WITH 24 RAMPS
9.
IGNITION ELECTRODE
10.
FLAME IONISATION ELECTRODE
11.
HEATING SAFETY THERMOSTAT
12.
ELECTRONIC GAS VALVE VK4105 A 1001
13.
GAS PRESSURE MODULATOR
14.
ELECTRONIC IGNITION BOARD
15.
EXPANSION VESSEL
16.
3-SPEED CIRCULATION PUMP WITH AIR VENT
17.
AUTOMATIC AIR VENT
18.
HEATING CIRCUIT 3 bar PRESSURE RELIEF VALVE
19.
DRAINING TAP
20.
WATER PRESSURE GAUGE
21.
WATER PRESSURE SWITCH
22.
HEATING SENSOR
23.
HOT WATER SENSOR
24.
3-WAY DIVERTER VALVE
25.
FLOWSWITCH CONNECTION WITH FLOW LIMITER
26.
ELECTRONIC FLOWSWITCH
27.
25 LITRE WATER STORAGE TANK
28.
ANODE CONTROL VALVE
29.
ANODE
30.
PLATE TYPE EXCHANGER
31.
BY-PASS
32.
AIR PRESSURE SWITCH
33.
FAN
34.
FLUE SAFETY THERMOSTAT
35.
-
36.
BOILER DRAING TAP
Flowswitch
C
B
A
Fig. 2
Fig. 1
Summary of Contents for RMAS 21 E
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