Table of Contents
Advertisement
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 installation diagram
page
30).
Model
Relief valve setting
Expansion control valve setting *
Max. mains supply pressure
With expansion control valve
Without expansion control valve
* Expansion control valve not supplied with the 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.
HOT WATER DELIVERY
This water heater can deliver water at temperatures which can cause scalding.
It is necessary and we recommend that a temperature limiting device be fitted between the water heater and
the hot water outlets in any ablution area such as a bathroom or ensuite, to reduce the risk of scalding. The
installing plumber may have a legal obligation to ensure the installation of this water heater meets the
delivery water temperature requirements of AS/NZS 3500.4 so that scalding water temperatures are not
delivered to a bathroom, ensuite or other ablution area.
The temperature limiting device used with a solar water heater should have a specified „minimum
temperature differential‟ between the hot water inlet and the tempered water outlet of no greater than 10°C.
Refer to the specifications of the temperature limiting device.
Where a temperature limiting device is installed adjacent to the solar water heater, the cold water line to the
temperature limiting device can be branched off the cold water line either before or after the isolation valve
and pressure limiting valve to the solar storage tank, but it MUST BE before the non return valve. If an
expansion control valve is required, it must always be installed after the non return valve and be the last
valve prior to the solar storage tank.
Warning: A non return valve MUST BE installed on the cold water line to the solar storage tank AFTER
the cold water branch to a temperature limiting device.
Two Temperature Zones Using a Temperature Limiting Device
INSTALLATION – SOLAR STORAGE TANK
160, 300
1000 kPa
850 kPa
680 kPa
800 kPa
21
(refer to diagram on
Advertisement
Table of Contents
