Raypak B0147 Owner's Manual And Installation Instructions page 15

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 18).
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.
Operation Type
Relief Valve Setting
Water Heating (kPa)
Mechanical Heating (kPa)
Expansion Control Valve (ECV²) Setting
Water Heating (kPa)
Mechanical Heating (kPa)
Minimum Supply Pressure
System water temperatures up to 65°C (kPa)
System water temperatures above 65°C (kPa)
Maximum Supply Pressure
with ECV² fitted
Water Heating (kPa)
Mechanical Heating (kPa)
without ECV² fitted
Water Heating (kPa)
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.
Pressure Specifications
System water temperatures up to 65°C
System water temperatures above 65°C
15
On/Off Hi/Lo
850 (700)¹ 850 (700)¹ ³
- 310
700 (550)¹ 700 (550)¹ ³
- -
70 70
120 120
680 (550)¹ 680 (550)¹ ³
- 240
550 (450)¹
550 (450)¹ ³
-
-
Minimum Tank Height
INSTALLATION
7 metres
12 metres