Specifications

SARIgas Zoom Z – ZF Page 6
Rev.0
VENTILATION OF THE ROOMS
VENTILATION OF THE ROOM IS COMPULSORY AND INDISPENSABLE FOR THE FOR SERIES
“Zoom” Z 420A Z 520A (Class B
11BS
appliances)
“Zoom” ZF 420A ZF 520A (Class B 22 appliances) for installation see Page 14,15.
These boilers must be installed in suitable surroundings, which guarantee the correct level of air intake for
combustion; they must be connected to a flue gas evacuation circuit (flue pipe).
Adhere to local legislation regarding the ventilation required for the room.
Air vents on the outside walls of the where the boiler is installed:
- Must have a free net air passage that conforms to current legislation in size;
- Must be made in such a way that the inside and outside vents cannot be covered or blocked.
- Must be protected with grids or wire net, etc., but the protection must not reduce the size of the passage as
indicated above.
- Correct aeration can be obtained from several vents, as long as the total net air passage corresponds to current
legislation.
- If the vents cannot be made near to the floor, the section of the vent opening must be increased, as indicated in
the specific standards.
- If there are other elements in the boiler room that draw in air to work, the section of the vent opening must be
adequately increased.
- If the boiler is installed in a room that contains a cooking hob without safety device, as it does not use an open
flame, the ventilation vents must be increased.
- The suction hood is always to be considered as an electric fan.
- An open fireplace must have its own air draft, otherwise gas appliances of the B 11BS type cannot be installed in the
room.
If an external opening cannot be made, air flow from an adjacent room is allowed as long as the room is not in
negative pressure due to the presence of another draft (fireplace or stove) or another suction appliance, and it is not
used as a bedroom.
Zoom Z 420A – Z 520A boilers are fitted with a flue gas safety thermostat which, if there is poor draft in the flue
passes, permanently blocks the gas flow to the main burner .If the flue gas safety thermostat triggers, turn the boiler off
and immediately contact a qualified technician to test the boiler.
IMPORTANT: Under no circumstances must the flue gas safety thermostat be
blocked, interfered with or removed (see Fig. 3).
The opening must not be even partially blocked, to maintain adequate hygiene
and safety levels in the room; if the boiler room (Zoom Z 420A – Z 520A) is not
well ventilated, the main burner could halt frequently, triggering the flue gas
safety device of the boiler. If this happens, contact a qualified technician
immediately to carry out the necessary tests.
IMPORTANT
“B 22” (ZF 420A; ZF 520A) boilers require suction of the combustion air directly from the room where they are installed.
Therefore, it is essential that the air suction grids, fig. 11 page 12, are never blocked for the boilers to work properly.
Do not close the boiler in hanging cupboards that are not sufficiently ventilated, and do not place other items on top of
the boiler.
Any electric, hydraulic and gas circuit parts must only be replaced with original SARIgas spare parts.
Only authorised and qualified SARIgas technicians must replace any faulty parts.
SARIgas declines all responsibility for damage caused by the improper use, faulty installation and the use of spare
parts that are not originals for the boiler.
Fig.3