2
GENERAL BOILER INFORMATION
7
2.4
NATURAL GAS (G20) SUPPLY
- Refer to section 15 for Propane (G31)
The maximum natural gas requirement of the boiler is 3.27 m³/h.
The meter and supply pipes must be capable of delivering this quantity of gas in addition to the demand from
any other appliances in the house. A 22 mm supply pipe will be necessary for the majority of installations,
but reference should be made to either BS 6891:1988 for detailed guidance on gas pipe sizing.
The meter and governor should ensure a dynamic pressure of 20 mbar (natural gas) at the inlet of the gas
valve in the boiler.
The complete installation, including the meter, must be tested for gas soundness and purged as described in
BS 6891.
2.5
ELECTRICITY SUPPLY
1 A 230 V ~ 50 Hz mains supply is required.
The boiler must be earthed.
2 The supply must be fused at 3 A and there must only be one common isolator for the boiler and control
system, and it must provide complete electrical isolation.
3 One of the following methods should be used for the connection. A fused double pole switch with a
contact separation of at least 3 mm in both poles or a fused three pin plug and unswitched shuttered
socket outlet (both complying with BS 1363).
4 The boiler is supplied with a pre-wired power supply cable with fitted 3 A fused plug.
5 All wiring external to the boiler must be in accordance with the current IEE Wiring Regulations.
6 Any room thermostat or frost thermostat used must have a 'volt free' control circuit.
7 The boiler requires a permanent mains supply, do not interrupt it with any external time control.
8 In the event of an electrical fault after installation of the boiler, the following electrical system checks must
be carried out:- Short circuit, Polarity, Earth continuity and Resistance to earth.
2.6
AIR SUPPLY
1 As the boiler is room-sealed, it does not require any combustion air vents.
2 If installed in a cupboard or compartment, permanent ventilation vents are required - one at high level and
one at low level. The vents may be either direct to the outside air or to a room. Both air vents must be into
the same room or be on the same wall to the outside air.
The minimum free area for each vent is 306 cm², this may be halved if the ventilation is directly to the
outside air.
3 If installed in a cupboard or compartment with a door, allow at least 75 mm clearance between the front of
the boiler and the door for air movement. 5 mm should be allowed at each side of the boiler.
2
.7
FLUE SYSTEM
1 The boiler is normally supplied with a 1 metre horizontal co-axial flue assembly with a 100 mm diameter
outer pipe (air duct) and a 60 mm inner pipe (flue duct) and a 90° offtake elbow for the top of the boiler.
2 The assembly may be modified and extended using 1 metre extensions, 45°and 90° elbows and a vertical
offtake to a maximum equivalent length of 4 metres.
Note: Each 45° and 90° bend has an equivalent flue length of 0.8 metres.
3 A vertical roof outlet kit is also available which may be combined with the components mentioned above
to a maximum length of 4.3 metres (from the top of the boiler to the top of the roof outlet).
4 A flue restrictor is provided with the boiler and must be used if the flue length is less than 1.5 metres (see
section 3.5).
5 It is possible to use a 'Two Pipe system' to increase the flue length. Refer to our seperate flue options
brochure for further details. The diameter of the restrictor is different for this flue type (see section 1.1).
6 The flue must be installed in accordance with BS 5440:1.
7 During cold conditions there may be a tendency for steam to come from the terminal (this is quite normal
for a high efficiency boiler). Do not position the terminal where this might cause a nuisance.
8 If the terminal is fitted within 850 mm of a plastic or painted gutter or within 450 mm of painted eaves, an
aluminium shield at least 750 mm long should be fitted to the underside of the gutter or painted surface.
9 If the terminal is fitted less than 2 m above a surface to which people have access, the terminal must be
protected by a guard. A suitable guard is available as an optional accessory.
The guard must be fitted centrally over the flue terminal and securely fixed to the wall.
10 The minimum dimensions for positioning the flue terminal are shown in Fig. 1.
11 Refer to section 1.4 for flue limitations.
Summary of Contents for RIO 140
Page 33: ...10 WIRING DIAGRAMS 33 10 1 ILLUSTRATED WIRING DIAGRAM ...
Page 34: ...10 WIRING DIAGRAMS 34 10 2 FUNCTIONAL FLOW WIRING DIAGRAM ...
Page 35: ...11 SEQUENCE OF OPERATION CHARTS 35 11 1 AUTOMATIC IGNITION SEQUENCE ...
Page 36: ...11 SEQUENCE OF OPERATION CHARTS 36 11 2 OPERATION IN CENTRAL HEATING MODE ...
Page 37: ...11 SEQUENCE OF OPERATION CHARTS 37 11 3 OPERATION IN DOMESTIC HOT WATER MODE ...
Page 47: ...NOTE 47 ...
Page 54: ...6 ELECTRONIC TIMER Description of controls see Figs 3 and 4 ...
