Novasun 150L Instruction & Installation Manual - page 18
Copyright © 2014
Ikhwezi Solar (Pty) Ltd, Novatherm CC, Solar Assist (Pty) Ltd
17
memory is only stored for approximately 72 hours
without being connected.
The use of the electrical backup is very much
dependent on personal usage patterns of hot
water. The following, however, are a few tips:
During days with temperatures below 20°C,
water temperature may only reach 40°C to
50°C. It could be lower if these colder days
are coupled with overcast and rainy
conditions.
The human body generally prefers
temperatures of between 35°C to 40°C for
bathing during winter and therefore
boosting may be required at certain times.
Backup heating is generally preferable
during late afternoon and early morning, so
that maximum use of solar energy during
the day is taken advantage of.
The backup should not be set that it is on
during periods when the water is being
used. This because an element cannot heat
the water with any efficiency when water is
being used.
If hot water use is heavy during the
evening then it is vital that a backup
heating period be set for the early morning
if one desires hot water first thing in the
morning.
13.8
Owner maintenance
To ensure that the system will perform reliably,
some preventative maintenance should be
performed by the home owner/user. If the
system is in a position which is not easily
accessible or the owner is not in a position to
effect the points below, a service technician
should
be
employed
to
carry
out
the
maintenance.
The following should be performed annually by
the owner/user appointed technician:
Wash the glass cover of the collector with a
mild household detergent. The collector
glass and seals should be inspected.
Mounting brackets and straps should be
checked for signs of wear.
Pipe insulation should be checked for signs
of degradation and/or damage. Please note
that although UV resistant insulation is
used, the harshness of the South African
climate means that the insulation will not
last indefinitely. There is no warranty on
pipe insulation.
Visually inspect pipework for signs of leaks,
scale build-up.
A periodic inspection of pressure reducing
valves, expansion valves, vacuum breakers,
temperature pressure 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 through the drain line during each
heating period. This occurs as heated water
expands by approximately 1L out of 50L of
its volume. If continuous leaking occurs this
may indicate a problem with the valve -
please report this to your installer
immediately. WARNING - Never block the
outlet of this valve. TP valves should be
checked for performance at intervals not
exceeding 6 months, or more frequently in
areas of high incidents of water deposits
(such as Calcium or Magnesium).Be advised
that in areas or periods of high solar
radiation there will be greater frequency of
this valve opening. In order to check the TP
valve the easing gear should be operated.
This is a black knob on the TP valve that
needs to be turned in an anti-clockwise