ABOUT YOUR WATER HEATER
8
Programming the Timer
Power must be available to the timer control switch before the booster heating unit can be activated.
The timer should be programmed:
to suit the hot water consumption pattern of the household,
with the end of the period to coincide with the commencement of the evening hot water usage,
(a second period, such as prior to the morning hot water usage, may be necessary)
to enable a boosting period of not less than the recommended continuous length of time for boosting,
and
for a period when power will be available for the booster heating unit to operate.
Note:
When daylight saving time applies, you may consider resetting the timer accordingly.
The recommended continuous length of time for boosting is:
Booster heating unit size
Model
Minimum winter
cold water temperature
Temperature
rise
2.4 kW
3.6 kW
4.8 kW
180
Cool / temperate climate
10°C
50°C
2 ¼ hours
1 ½ hours
1 ¼ hours
Temperate / sub tropical climate
15°C
45°C
2 hours
1 ½ hours
1 hour
Tropical climate
20°C
40°C
1 ¾ hours
1 ¼ hours
1 hour
300
Cool / temperate climate
10°C
50°C
3 ¾ hours
2 ½ hours
2 hours
Temperate / sub tropical climate
15°C
45°C
3 ½ hours
2 ¼ hours
1 ¾ hours
Tropical climate
20°C
40°C
3 hours
2 hours
1 ½ hours
The recommended boosting periods are sufficient to allow the booster heating unit to heat up the boost
volume of the solar storage tank to 60°C where the winter cold water temperatures do not fall below those
shown. This may be necessary during periods of very low solar energy gain through the solar collectors,
such as during constant rain or extremely cloudy weather, particularly in winter when the incoming cold water
temperature is lower. The period will also provide a sufficient heat up time for the electric booster to operate,
if required, to satisfy the requirements of AS 3498.
The booster heating unit will only activate if heating is required and power is available from the timer. When
the water is below the thermostat setting, the booster heating unit will turn on and heat the water. The
booster heating unit will automatically turn off either when the temperature of the water reaches the
thermostat setting or at the end of the timer period, whichever comes first.
RAIN WATER TANK
If the 52H or RLX series solar water heater is installed on a section of roof which is part of a rain water runoff
collection system, then it is recommended this section of roof and its gutter be isolated from the rain water
collection system. The gutter should be isolated to a width greater than the solar water heater and pipe work
and must have suitable drainage. This is to ensure in the event of a leak from the closed circuit, a rainwater
tank cannot be contaminated with closed circuit fluid.
The closed circuit fluid contains food grade additives (rust inhibitor and anti-freeze agent), is non-toxic and is
harmless to the environment. However, if it enters a rain water tank it can cause an unpleasant odour to
develop and result in the rain water tank having to be drained and cleaned.