INSTALLATION
23
OUTDOOR INSTALLATION
The water heater is to be installed at ground or floor level on a stable fireproof base as acceptable to local
authorities. The water heater must also stand vertically upright with the back of the water heater
against or
within 150 mm of an external wall
or alternatively against a fireproof screen extending at least 500 mm
above, below and either side the flue terminal. Failure to observe this precaution can cause problems in high
wind areas. A secondary flue is not required.
The water heater must be located to ensure that the location of the flue terminal complies with the requirements
of AS/NZS 5601.1. As a guide the following requirements are extracted from the Gas Installations Standard.
The distances are measured along the wall behind the water heater.
•
At least 500 mm between the top of the flue terminal and the
eaves.
•
At least 1500 mm (635275 model) between the flue terminal
and the edge of any opening into the building, such as an
openable door or window, measured horizontally*.
•
At least 1500 mm (635275 model) between the flue terminal
and the edge of any opening into the building, such as an
openable window, measured vertically.
•
At least 500 mm between the flue terminal and a return wall or
external corner, measured horizontally*.
Note:
* If these horizontal distances cannot be achieved, AS/NZS 5601.1 states an equivalent horizontal
distance measured diagonally from the nearest discharge point of the flue terminal to the opening may be
deemed to comply. Check with the local regulator.
MAINS WATER SUPPLY
Where the mains water supply pressure exceeds that shown in the table below, an approved pressure limiting
valve is required and should be fitted as shown in the
on page 30.
Model
275
Temperature pressure relief valve setting
1000kPa
Expansion control valve setting*
850kPa
Maximum mains supply pressure
With expansion control valve
680kPa
Without expansion control valve
800kPa
* Expansion control valve not supplied with water heater
TANK WATER SUPPLY
If the water heater is supplied with water from a tank supply and a pressure pump system is not installed, then
the bottom of the supply tank must be at least 1 m above the highest point of the hot water plumbing system,
including the water heater. Care must be taken to avoid air locks. The cold water line to the water heater should
be adequately sized and fitted with a full flow gate valve or ball valve.
