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INSTALLATION
15
HIGH WIND CONDITIONS
In areas where high winds frequently occur, it WILL be necessary to:
• Locate the water heater a minimum of one (1) metre away from high
vertical walls.
• Install a wind break to protect the water heater from the prevailing winds.
• 147 Models Only: Replace the standard flue terminal with a HIGH WIND
top (at extra cost). A high wind top is not available for 109 models.
COLD WATER SUPPLY
Water Heating Applications
Where the cold 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 installation diagram (refer to diagram on page 19).
Mechanical/Process Heating Applications
A cold water feed regulator (Pressure Reducing Valve) should be installed on the cold water make up line. The
minimum water pressure should be as shown in the table below. Backflow prevention in accordance with
AS/NZS 3500.1 may be required.
Pressure Specifications
Operation Type On/Off Hi/Lo
Relief Valve Setting
Water Heating (kPa) 850 (700)¹ 850 (700)¹ ³
Mechanical Heating (kPa) - 310
Expansion Control Valve (ECV²) Setting
Water Heating (kPa) 700 (550)¹ 700 (550)¹ ³
Mechanical Heating (kPa) - -
Minimum Supply Pressure
System water temperatures up to 65°C (kPa) 70 70
System water temperatures above 65°C (kPa) 120 120
Maximum Supply Pressure
with ECV² fitted
Water Heating (kPa) 680 (550)¹ 680 (550)¹ ³
Mechanical Heating (kPa) - 240
without ECV² fitted
Water Heating (kPa)
550 (450)¹
550 (450)¹ ³
Mechanical Heating (kPa)
-
-
¹ Figures in brackets are to be used if a stainless steel storage tank is utilised in the system.
² Expansion control valve is not supplied with the water heater.
³ An 850kPa relief valve can be fitted to Hi/Lo water heaters when used in water heating applications.
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 height to the bottom of the supply tank must be as
specified in the table opposite.
Minimum Tank Height
System water temperatures up to 65°C
7 metres
System water temperatures above 65°C
12 metres