INSTALLATION
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 |
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Water Heating (kPa) | 850 (700)¹ | 850 (700)¹ ³ |
Mechanical Heating (kPa) | - | 310 |
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Expansion Control Valve (ECV²) Setting |
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Water Heating (kPa) | 700 (550)¹ | 700 (550)¹ ³ |
Mechanical Heating (kPa) | - | - |
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Minimum Supply Pressure |
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System water temperatures up to 65°C (kPa) | 70 | 70 |
System water temperatures above 65°C (kPa) | 120 | 120 |
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Maximum Supply Pressure |
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with ECV² fitted |
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Water Heating (kPa) | 680 (550)¹ | 680 (550)¹ ³ |
Mechanical Heating (kPa) | - | 240 |
without ECV² fitted |
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Water Heating (kPa) | 550 (450)¹ | 550 (450)¹ ³ |
Mechanical Heating (kPa) | - | - |
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¹Figures 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 |
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System water temperatures above 65°C | 12 metres |
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