Owner’s Manual – Solar Water Heaters
26
H3165 029664 Rev. B
Considering a Service Call?
It is recommended that the following points
be reviewed before making a service call:
No Hot Water:
If there is no hot water, both the solar
collectors and boost systems are not
working. Please refer to “No Solar Energy
Gain” and “Booster not Operating” below.
High Energy Bills or Insufficient Hot
Water:
These maybe caused by a number of
factors:
• Less than expected quantities of solar
heated water. Please refer to “Poor Solar
Energy Gain” below.
• Underestimated hot water usage
of showers, washing machines and
dishwashers. Review these appliances
to determine if the daily usage is greater
than the capability of the water heater. If
necessary check the shower flow rates
with a bucket, measuring the amount of
water used over a period of time. If it is not
possible to adjust water usage patterns,
an inexpensive flow control valve can
easily be fitted to the shower outlet.
• Storage tank not large enough. Sizing
details are available from your Dux
supplier.
• Leaking hot water pipe or dripping hot
water tap. A small leak can waste a large
quantity of hot water. Replace faulty tap
washers and arrange for your plumber to
rectify any leaking pipe work.
• Pressure & Temperature Relief Valve
discharging too much water. Please refer
to “Relief Valve Discharging Water” below.
Relief Valve Discharging Water:
Continuous Trickle:
A continuous trickle of water from the
Pressure & Temperature Relief (PTR) Valve
is most likely due to a build-up of foreign
matter. In this case, try gently raising the
easing lever on the PTR Valve for a few
seconds, then release gently. This may
dislodge a small particle of foreign matter
and rectify the fault.
Water Discharge During Heating:
It is not unusual for a small quantity of water
to discharge during heating of water in the
storage tank. The amount of discharge will
depend on hot water usage and the size of
the storage tank.
As a guide, it will discharge about 2% of the
volume of the water heated.
Continuous Discharge of Water:
Continuous discharge of water from the PTR
Valve may indicate a problem with the water
heater. Turn off the water heater and contact
Dux After Sales and Service.
No Solar Energy Gain:
Water is pumped through the solar collectors
when conditions are measured as suitable by
the solar controller.
