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33-1197 Solahart Owner‟s Manual – Thermosiphon Systems - Revision H – Nov 2013
5
Timer Control of the Tank Boosting
A timer control switch can be installed and will help maximise energy savings with an electrically boosted solar water
heater connected to a continuous, time of use or extended Off-Peak (overnight and day) electricity supply.
If used with an extended Off-Peak (overnight and day) electricity supply, the timer switch should:
Be operated by a continuous power supply on its own circuit from the switchboard with the booster heating unit
operated by the Off-Peak power supply.
A double pole isolating switch is required to be installed at the switchboard to simultaneously isolate both circuits.
Or
Be of a type which has an internal rechargeable battery to keep time when the power supply is not available to the
timer
Programming the Timer
Power must be available to the timer control switch before the booster heating unit can be ac tivated.
The timer control switch should be programmed:
to suit the hot water consumption pattern of the household,
with the end of the boost period to coincide with the commencement of the evening hot water usage,
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.
It may be necessary to program a second period into the timer, such as prior to the morning hot water usage.
Note: When daylight saving time applies, you may consider resetting the timer accordingly.
The recommended continuous length of time for boosting (for a 240 V power supply) is:
Cool/temperate climate
Minimum winter cold water supply temperature
Thermostat set point
Temperature rise
= 10°C
= 60°C
= 50°C
Booster Heating Unit
150 model
180 model
220 model
300 model
440 model
1.5 kW
3 hours
3 ¾ hours
4 ½ hours
6 hours
8 ¾ hours
1.8 kW
2 ½ hours
3 hours
3 ¾ hours
5 hours
7 ½ hours
2.4 kW
2 hours
2 ¼ hours
2 ¾ hours
3 ¾ hours
5 ½ hours
2.5 kW
2 hours
2 ¼ hours
2 ¾ hours
3 ¾ hours
5 ¼ hours
3.6 kW
1 ½ hours
1 ½ hours
2 hours
2 ½ hours
3 ¾ hours
4.8 kW
1 hour
1 ¼ hours
1 ½ hours
2 hours
2 ¾ hours
Temperate/sub tropical climate
Minimum winter cold water supply temperature
Thermostat set point
Temperature rise
= 15°C
= 60°C
= 45°C
Booster Heating Unit
150 model
180 model
220 model
300 model
440 model
1.5 kW
2 ¾ hours
3 ¼ hours
4 hours
5 ½ hours
8 hours
1.8 kW
2 ¼ hours
2 ¾ hours
3 ¼ hours
4 ¾ hours
6 ¾ hours
2.4 kW
1 ¾ hours
2 hours
2 ½ hours
3 ½ hours
5 hours
2.5 kW
1 ¾ hours
2 hours
2 ½ hours
3 ¼ hours
4 ¾ hours
3.6 kW
1 ¼ hours
1 ½ hours
1 ¾ hours
2 ¼ hours
3 ¼ hours
4.8 kW
1 hour
1 hours
1 ¼ hours
1 ¾ hours
2 ½ hours