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Copyright © 2014 

Ikhwezi Solar (Pty) Ltd, Novatherm CC, Solar Assist (Pty) Ltd

 

14 

 

 

Once you get used to the system and its 
optimum performance pattern, you may 
eventually completely switch the electrical 
backup off, particularly in summer months. 
An additional benefit of this is that it is the 
fastest way to reduce the system’s payback 
period. 

 

Savings can be further maximised by using 
hot water in the evening rather than in the 
morning, maximising the free energy 
harvested during the day. 

Additional tips to enhance savings include: 

 

To further optimise energy and hot water 
savings, install aerated shower heads and 
aerators in taps to reduce hot water 
consumption. 

 

Insulate hot water piping to minimise heat 
losses. 

 

Showering generally uses less water than 
bathing.  

 

For health reasons your hot water system 
should provide water at 55ºC, but not much 
warmer than that. Do not set your thermostat 
backup temperature control for temperatures 
in excess of this. 

 

If shading of collectors is experienced 
between 9am and 3pm then corrective action 
should be taken. Annually prune or cut trees 
that shade the system. 

 

Partial shading by chimneys, TV antennas, 
roof erected fixtures, etc. on buildings during 
these hours is acceptable provided that it 
does not exceed 10% of the area. Shading 
from newly erected buildings should be 
checked and if system performance is 
affected, relocation of the system may be 
necessary.  

13.3

 

Over-night temperature stabilisation 

 

Over-night temperature stabilisation is the 
reduction in water temperature, as the hot 
water at the top of the storage cylinder 

transfers some of its heat to the cooler water 
in the lower section of the cylinder.  

 

This effect is often perceived as heat loss, but 
is actually the redistribution of stored heat 
more evenly over the entire contents of the 
storage tank. This may make it necessary to 
use the electric element to raise the water in 
the top section of the cylinder back to an 
acceptable temperature.  

 

Over-night temperature stabilisation is most 
evident in the morning if the time clock is left 
off overnight. 

13.4

 

High water temperature 

 

Your solar water heater will generate hot 
water quickly and efficiently. Under normal 
family use, it will operate between 60ºC and 
70ºC. However, the temperature can exceed 
this and under certain circumstances may be 
as high as 95ºC. This can occur during 
prolonged periods of direct sunlight and 
particularly in summer or long periods of 
reduced water usage. Extreme care should be 
taken in these circumstances. 

 

Although every system is fitted with a mixing 
valve that regulates temperature at points of 
water use, check the water temperature 
before use, such as when entering a shower 
or filling a bath or basin, to ensure it is 
suitable for the application and will not cause 
scalding. It is required by SANS regulations, 
that a temperature limiting device / mixing 
valve be fitted to the system. This will limit 
the water temperature to 50°C at the point of 
use. The risk of scalding will be reduced, but 
water should always be tested prior to use to 
prevent injury in the case of a tempering 
valve failure. 

13.5

 

Periods of reduced usage or holidays 

If the water heater is left unused for two weeks 
or more a small quantity of hydrogen gas, which 
is highly flammable may accumulate in the top of 
the water cylinder. This is true of both 

Содержание NovaSun 150l

Страница 1: ...ter Systems October 2013 For use by trained qualified personnel only Applicable to the following models Novasun Direct Freeze Resistant 150l 200l 300l We reserve the right to change the installation instructions Reproduction even partial is only allowed with written permission WE Geysers Pty Ltd 7 Nelmapius Street Chamdor Krugersdorp 1754 novasun solarassist co za www novasunsolar co za ...

Страница 2: ...ing process 7 8 1 Suggested mounting method 1 7 8 2 Suggested mounting method 2 8 9 System Installation 8 9 1 General installation technique 8 9 2 Cylinder and System plumbing 8 9 3 Geysers 9 9 4 Electrical connection 9 9 5 Installation Diagrams 9 Pumped System Installation Diagram 9 10 System commissioning 11 10 1 Commissioning direct systems 11 11 Installation checklist 11 12 System Selection an...

Страница 3: ...ty Ltd does not accept liability or responsibility for the final fitness of water for consumption from this water heater as the water quality is not affected by the system and is a function of the municipal and or other water supply This manual has been written with the intention of ensuring that the system is correctly installed and that the owner user is fully conversant with the best methods of...

Страница 4: ... the natural circulation of fluid between the collector and the geyser In order for the thermo siphon process to occur the geyser must be placed in a higher position than the solar collector The system operates according to the laws of thermal dynamics i e a liquid when heated becomes less dense and rises above the denser cooler liquid Heated water rises up through the collector and into the geyse...

Страница 5: ...mixed in a glycol to water ratio of 1 3 i e 33 glycol 5 4 Scale resistance Indirect systems containing a glycol solution also prevents scale build up inside the collector in areas of poor water quality It is important to note that the geyser itself may still be affected by water quality as would be the case with any conventional enamel lined geyser unless a Solartherm PEX lined geyser is used If a...

Страница 6: ... Ensure that the roof covering material is structurally sound to receive the weight of the system In the case of a split system installation a wooden frame should be constructed which raises the tank above the level of the collectors Care should be taken in the design and construction of this frame so as to ensure it meets all relevant standards 7 Mounting methods 7 1 Selection of appropriate moun...

Страница 7: ...f covering is then placed back into original position c The bracket is placed underneath the geyser foot plate with the bolt sliding through the slotted hole and tightened using the wing nut as supplied d Note the correct use of left hand and right hand bracket Attached strapping is then tightened onto the timber structure in the same way as above NovaSun tanks are equipped with extra anchor point...

Страница 8: ...le leaks The collector is positioned into the collector bracket as demonstrated in the image above A slight kick of 25mm from the cold inlet side to the hot outlet side of the collector is recommended i e cold side lower than hot side by 25mm In the case of sheet roofing as depicted in the following image a roof screw can be removed the strap placed over the existing hole and the roof screw reinse...

Страница 9: ...hat the drain cock is at the lowest point of the tank Once the tank is in place fix the hoop in place and replace tiles 9 System Installation 9 1 General installation technique During fitting and prior to filling the system must be protected against the entry of dirt and water After the system has been mounted it must be flushed in order to remove any debris e g metal chips packaging residue sawdu...

Страница 10: ...s which require regular servicing as well as allowing for the required SANS height of vacuum breakers above the tank 9 4 Electrical connection All electrical work must be carried out by properly qualified and registered electricians Novasun recommends the installation of a time switch when undertaking a solar installation This optimises the performance of the system and is specifically required wh...

Страница 11: ...CC Solar Assist Pty Ltd 10 Pumped Controller Geyserwise System Acknowledgment Geyserwise Installation Manual For purpose of Pump controller installation and wiring instruction refer to the Geyserwise Installation manual or go to www geyserwise co za ...

Страница 12: ...o pressurise Check all piping joints and fittings for water leaks Check pressure relief valves to ensure correct operation Turn on the electric backup element Make sure the tank is completely filled before turning on the element Ensure power is available to the backup element Ensure the time clock has been correctly set 11 Installation checklist The following checklist should be observed by the in...

Страница 13: ...ken per day and how many litres are used how many baths are taken and size of baths how much hot water goes towards washing dishes and doing laundry etc Only once this information is analysed can a final recommendation be made on system size 12 3 System type System type can relate to a number of system characteristics as follows Direct vs Indirect refer section 5 above Close coupled vs Split refer...

Страница 14: ...ar system Time clock settings should generally speaking be set for two hours in the morning and two hours in the evening For example if you bath at 06h30 and 18h00 set your time clock for 04h00 to 06h00 and again for 15h00 to 17h00 Ensure backup time periods do not coincide with localised load shifting by municipalities employing ripple relay devices This will ensure that if there was not sufficie...

Страница 15: ...e cylinder transfers some of its heat to the cooler water in the lower section of the cylinder This effect is often perceived as heat loss but is actually the redistribution of stored heat more evenly over the entire contents of the storage tank This may make it necessary to use the electric element to raise the water in the top section of the cylinder back to an acceptable temperature Over night ...

Страница 16: ...switched off i e approximately 72 hours depending on the model 13 6 Freeze protection liquid No freeze protection liquid is used in the Novasun system 13 7 Setting the time clock WE Geysers Pty Ltd recommends that an SABS approved time clock with battery backup be installed on the distribution board There are many such time clocks on the market and the operation of which are all relatively similar...

Страница 17: ...e timer and provide the geyser with a constant supply The Bypass on display flashes Press the Bypass Off button for power to be controlled by the timer and switch on according to the set times Press the function button to return to screen one Note When in Bypass On mode the display will not revert to screen one after 60 seconds Should you be away from home for any extended period and you wish to s...

Страница 18: ...ure valves and tempering valves should be conducted on a solar geyser just as it should be done on any conventional electrical geyser These valves allow for the safe operation of the geyser and should be inspected twice yearly The temperature pressure TP valve is near the top of the water heater and is essential that this valve operates safely It is possible for the valve to release a little water...

Страница 19: ...ll or part of the day Hot water usage has not been excessive Hot water is not leaking from within the plumbing system that feeds hot water to the points of use The time clock is operational and has been programmed correctly The electric meter and or display light on the time clock speeds up when the time clock is active Power has been provided to the main board i e no electrical faults or load she...

Страница 20: ...td 19 17 Warranty Services log warranty services Important Notice Making use of a non accredited Solar Installer to perform warranty work on your Novasun SWH system will void your Warranty Agreement Date Service Provider Contact detail Services Job performed Owner Notes ...

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