andrews RSC 150 Installation And Operation Manual page 10

INSTALLATION
Note: - Both air vents must communicate with the same room or internal space or must
both be on the same wall to outside air.
Air vents should have negligible resistance and must not be sited in any position where they
are likely to be easily blocked or flooded or in any position adjacent to an extraction system
which is carrying flammable vapour.
Consideration must be given to the position of the high level ventilation opening. A high
level vent must not be sited within 300mm measured vertically, of the flue terminal
Grilles or louvers should be so designed that high velocity air streams do not occur within
the space housing the heater(s).
IMPORTANT:
The vapours given off by halogen based compounds can, if drawn into the combustion air,
cause corrosion of the Storage Vessel and premature failure of the thermocouple.
If water heaters are to be installed, in locations where halogens are likely to be present they
should be isolated from such compounds and ventilated from and to outside,
uncontaminated atmosphere.
Some of the vulnerable areas are listed below -
(i) Hairdressing salons and adjoining rooms and basements.
(ii) Establishments where dry cleaning solutions are used or stored.
(iii) De-greasing plants using hydrocarbon solvents.
(iv) Premises where refrigerant gases are used or stored.
SECTION 3
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