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1.9 INSTALLATION OF INTERNAL HEATERS - ROOM, ENCLOSURE OR PLANT ROOM
In a room, enclosure, residential garage or a plant room with natural ventilation conditions.
Installation of a gas appliance in a room or enclosure for properties approved for construction PRIOR TO
31st March 2014.
1.
Determine if the unit(s) MJ/hr rating for each cubic metre of the room or enclosure, is greater than 3 MJ/hr per m³.
e.g.
Unit rating (Ur)
Room volume (Rv)
Ur/Rv = 120/2.4
Additional ventilation required in the room or enclosure.
2.
Two permanent openings are required, each equivalent in area to the determined value "A". The lower vent
shall be located close to the floor or at burner level. The upper vent shall be located at or above the top of the
unit. The two openings may be combined as long as the above conditions are met.
Determine free ventilation area using A = T x F.
Where
A = The minimum free ventilation area, mm2
T = The total gas consumption of all gas appliances, MJ/hr, i.e. KU521 = 90MJ/hr
F = The factor detailed in the below table
Gas appliance location
Gas appliance in a room or enclosure
Gas appliance in a plant room
DIRECTLY TO OUTSIDE is either through an outside wall, into a cavity vented to outside, into
an underfloor space or roof space vented to outside.
NOTE
Installation of a gas appliance in a room or enclosure for properties approved for construction AFTER
31st March 2014.
1.
Determine if the unit(s) MJ/hr rating for each cubic metre of the room, enclosure, residential garage or plant
room is greater than 0.4 MJ/hr per m³.
e.g.
Unit rating (Ur)
Room volume (Rv)
Ur/Rv = 120/2.4
Additional ventilation required in the room, enclosure,residential garage or plant room.
Refer to AS5601 for natural ventilation requirements.
For all other applications, e.g. Mechanical Ventilation, refer AS/NZS 5601.
NOTE
1.10 EXTERNAL INSTALLATIONS
Kaden KE3 & KE4 External, KU3, KU4 & KU5 Universal models can be installed outside of the house. For an
installation under a house floor, a KU3, KU4 or KU5 Universal model should be chosen.
All heaters that are installed externally on the ground should be installed on a level concrete base or pad, and there
must be provision made to drain away any surface water from the heater.
If the heater is to be installed in an elevated position or on a roof, the installation must comply with AS/NZS 5601.
It must be secured to prevent movement and it must have adequate provision for service access.
= 120MJ/hr
= 1m x 1m x 2.4m = 2.4m³
= 50 MJ/hr per m³ > 3 MJ/hr per m³
Source of Ventilation
Directly to outside
Via an adjacent room
Directly to outside
Via an adjacent room
Table 2
= 120MJ/hr
= 1m x 1m x 2.4m = 2.4m³
= 50 MJ/hr per m³ > 0.4 MJ/hr per m³
Factor F
300
600
150
300
9
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