INSTALLATION
13
SAFE TRAY
Where damage to property can occur in the event of the water heater leaking, the water heater must be installed in
a safe tray. Construction, installation and draining of a safe tray must comply with AS/NZS 3500.4 and all local
codes and regulatory authority requirements. AS/NZS 3500.4 also has particular requirements when a safe tray
must be installed.
FIRE RESISTANT MATERIALS
Fire resistant materials should comply with the requirements of AS/NZS 5601 Appendix C. If in doubt, seek advice
from your material supplier or your local regulator.
INDOOR INSTALLATION
The correct draft diverter must be fixed to the top of the water heater (Refer
to “Hood Conversion” on page 16) and connected to a properly constructed
flue, to discharge the combustion products outside the building. The flue
must be self supporting and not impose a load on the water heater. Use a
slip joint or similar to allow for disconnection and to enable the water heater
top panel and draft diverter to be removed for servicing. There must be a
vertical rise of 600 mm from the draught diverter before changing direction.
The flue design and installation must comply with AS/NZS 5601.
NOTE
: Reduction of the flue diameter or alteration to the draft diverter may
void the water heater warranty.
The water heater is to be installed at ground or floor level and must stand
vertically upright. There are also special requirements in AS/NZS 5601 for
water heaters installed in a garage, an enclosed space and other locations.
Remember all local authorities have regulations about putting water heaters
into roof spaces.
CLEARANCES (INDOOR INSTALLATIONS)
The distances set out in the following table should be observed.
147 Models
Minimum
Clearances from:
Non-Combustible
materials (mm)
Combustible
materials (mm)
Rear
300
500
Left side
300
500
Front
750
750
Right side
300
500
Ceiling
1200
1200
The normal water heater design is with the water pipe entry from the rear for 147 models. For servicing purposes
allow at least 750mm in front of the water heater for burner tray removal.
COMBUSTION / VENTILATION AIR
Indoor model water heaters must be installed in a protective enclosure or properly constructed plant room with
adequate ventilation in accordance with AS/NZS 5601.
Ideally ventilation shall be via two permanent openings DIRECTLY to outside, one at an upper level and one at low
level.
Where the air is sourced DIRECTLY from outside the minimum free area
required for each opening is provided in the table opposite. Where the
ventilation is by an alternate method refer to AS/NZS 5601 for ventilation
calculations.
NOTE:
The minimum dimension of any opening shall be 6mm
WARNING!
Air supply to the area where the water heater is installed must not be affected by mechanical
exhaust vents such as kitchen or bathroom fans, spa blowers, etc. Mechanical exhaust vents may create a
negative pressure in the area where the water heater is installed and can become a hazard by asphyxiation,
explosion or fire.
Model
Total area (cm
2
)
147
441
