Instructions For Fitters; General Information; Instructions Prior To Installation - Baxi Nuvola 3 Comfort Operating And Installation Instructions

High performance gas-fired wall-mounted boiler

Table of Contents

The following notes and instructions are addressed to fitters to allow them to carry out trouble-free installation. Instructions for lighting

and using the boiler are contained in the 'Instructions for Users' section.

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 26.

• Do not leave any packaging (plastic bags, polystyrene, etc.) within the reach of children as they are a potential source of danger.

• Initial lighting of the boiler must be carried out by an authorised Service Engineer, as indicated on the attached sheet.

Failure to observe the above will render the guarantee null and void.

12. INSTRUCTIONS PRIOR TO INSTALLATION

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.

Do the following before connecting the boiler:

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) Make sure that the flue terminal draft is appropriate, that the terminal is not obstructed and that no exhaust gases from other appliances

are expelled through the same flue duct, unless the latter has been specially designed to collect exhaust gas from more than one

appliance, in compliance with current laws and regulations.

c) 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:

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.

Heating circuit

2.1. new system

Before proceeding with installation of the boiler, the system must be cleaned and flushed to eliminate residual thread-cutting

swarf, solder and any solvents, using suitable proprietary products. To avoid damaging metal, plastic and rubber parts, only use

neutral cleaners, i.e. non-acid and non alkaline. 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 plant:

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 avoid damaging metal, plastic and rubber parts, use only neutral cleaners, i.e. non-acid and non-

alkaline 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 guarantee null and void.