Instructions For Fitters; General Precautions; Warnings Prior To Installation - Baxi Nuvola 3+ BS40 Operating And Installation Instructions

The following notes and instructions are addressed to installers to allow them to carry out trouble-free installation. Instructions
for igniting and using the boiler are contained in the 'Instructions for Users' sections.
Moreover, the installation technician must be qualified to install heating appliances.
Additionally, bear in mind the following:
• This boiler can be connected to any type of double- or single-pipe convector plate, radiator or thermoconvector. Design
the system sections as usual, though, bearing in mind the available flow-head at the plate, as shown in section 23.
• Do not leave any packaging (plastic bags, polystyrene, etc.) within reach of children, as it is a potential source of danger.
• Initial ignition of the boiler must be carried out by the Authorised Service Centre, as indicated on the attached sheet.
Failure to observe the above will render the guarantee null and void.

12. WARNINGS PRIOR TO INSTALLATION

This natural draught boiler is intended to be connected only to a flue shared between multiple dwellings in existing buil-
dings that evacuates the residues of combustion to the outside of the room containing the boiler. It draws the combustion
air directly from the room and incorporates a draught diverter. Due to lower efficiency, any other use of this boiler shall be
avoided and would result in higher energy consumption and higher operating costs.
This boiler has been designed to heat water to a temperature lower than boiling point at atmospheric pressure.
It must be connected to a central heating system and to a domestic hot water supply system according to its performance
and power output.
Before having the boiler installed by a qualified installer, check the following:
a) Make sure that the boiler is adjusted to use the type of gas delivered by the gas supply. To do this, check the markings
on the packaging and the rating plate on the appliance.
b) Checking the boiler has a fix external flue pipe which diameter has not to be less than the draught diverter's collar
dimension.
c) Make sure that the flue terminal draft is appropriate and that the terminal is not obstructed.
d) Make sure that, if the boiler is connected to existing flue ducts, these have been thoroughly cleaned as residual products
of combustion may detach from the walls during operation and obstruct the flow of fumes.
To ensure correct operation and maintain the warranty, observe the following precautions:
1. DHW circuit:
1.1. If the water is harder than 20 °F (1 °F = 10 mg calcium carbonate per litre of water), install a polyphosphate dispenser
or an equivalent treatment system, compliant with current regulations.
1.2. Thoroughly flush the system after installation of the appliance and before use.
1.3. The materials used for the product's DHW circuit comply with Directive
2. Heating circuit
2.1. new system
Before installing the boiler, the system must be cleaned and flushed to eliminate residual thread-cutting swarf,
solder and any solvents, using suitable off-the-shelf non-acid and non-alkaline products that do not damage metal,
plastic and rubber parts. Recommended cleaning products are: SENTINEL X300 or X400 and FERNOX Regenerator
for heating circuits. Use these products in strict compliance with the manufacturers' instructions.
2.2. existing system:
Before installing the boiler, drain the system and clean it to remove sludge and contaminants, using suitable
proprietary products as described in section 2.1.
To protect the system from scale, use inhibitors such as SENTINEL X100 and FERNOX protector for heating circuits.
Use these products in strict compliance with the manufacturers' instructions.
Remember that the presence of foreign bodies in the heating system can adversely affect boiler operation (e.g.
overheating and excessive noise of the heat exchanger).
Failure to observe the above will render the warranty null and void.

INSTRUCTIONS FOR FITTERS

11. GENERAL PRECAUTIONS

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98/83/CE.
7217402.01 - en