CONNECTIONS – ELECTRICAL
38
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 boost periods to coincide with the commencement of the morning and evening hot
water usage,
to enable each boosting period to be not less than the recommended continuous length of time for
boosting,
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
270
Cool / temperate climate
10°C
50°C
3 ¼ hours
2 ¼ hours
1 ¾ hours
Temperate / sub tropical climate
15°C
45°C
2 ¾ hours
2 hours
1 ½ hours
Tropical climate
20°C
40°C
2 ½ hours
1 ¾ hours
1 ¼ 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.
TEMPERATURE SETTING
The thermostat is adjustable from 60°C to 70°C. The thermostat is adjusted by turning the adjuster
anticlockwise to decrease the temperature setting and clockwise to increase the temperature setting. Only
adjust the temperature setting when the isolating switch is switched off at the switchboard.
For reasons of safety and economy, we advise the thermostat be set at the lowest temperature that will
provide sufficient hot water during periods when boosting is required. Solahart recommends the thermostat is
set at 60°C to maximise solar contribution. Discuss the thermostat setting requirements with the
householder.
HOT SENSOR LEAD
House the hot sensor lead at the water heater in the flexible conduit provided and secure the conduit in the
cut out on the tab located behind the upper front cover. Connect the hot sensor cable to the hot sensor cable
connector located on the tab behind the upper front cover. Secure the hot sensor lead to the water heater
jacket to prevent possible damage.
AUXILIARY PUMP
The auxiliary pump, if installed, must be wired to the control board. Refer to
“Auxiliary Pump – Electrical
Connection”
on page 42.
